Дисертації з теми "U-Pb detrital zircon geochronology"
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Ames, Carsyn Jean. "Insights for provenance analysis of modern watersheds from detrital apatite and detrital zircon U-PB geochronology- Talkeetna Mountains, southcentral Alaska." Thesis, University of Iowa, 2018. https://ir.uiowa.edu/etd/3244.
Повний текст джерелаSorota, Kristin Joy. "Age and Origin of the Merrimack Terrane, Southeastern New England: A Detrital Zircon U-Pb Geochronology Study." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3043.
Повний текст джерелаThesis advisor: Yvette D. Kuiper
Metasedimentary rocks of the Merrimack terrane (MT) originated as a thick cover sequence on Ganderia consisting of sandstones, calcareous sandstones, pelitic rocks and turbidites. In order to investigate the age, provenance and stratigraphic order of these rocks and correlations with adjoining terranes, detrital zircon suites from 7 formations across the MT along a NNE-trending transect from east-central Massachusetts to SE New Hampshire were analyzed by U-Pb LA-ICP-MS methods on 90-140 grains per sample. The youngest detrital zircons in the western units, the Worcester, Oakdale and Paxton Formations, are ca. 438 Ma while those in the Kittery, Eliot and Berwick Formations in the northeast are ca. 426 Ma. The Tower Hill Formation previously interpreted to form the easternmost unit of the MT in MA, has a distinctly different zircon distribution with its youngest zircon population in the Cambrian. All samples except for the Tower Hill Formation have detrital zircon age distributions with significant peaks in the mid-to late Ordovician, similar abundances of early Paleozoic and late Neoproterozoic zircons, significant input from ~1.0 to ~1.8 Ga sources and limited Archean grains. The similarities in zircon provenance suggest that all units across the terrane, except for the Tower Hill Formation, belong to a single sequence of rocks, with similar sources and with the units in the NE possibly being somewhat younger than those in east-central Massachusetts. The continuous zircon age distributions observed throughout the Mesoproterozoic and late Paleoproterozoic are consistent with an Amazonian source. All samples, except the Tower Hill Formation, show sedimentary input from both Ganderian and Laurentian sources and suggest that Laurentian input increases as the maximum depositional age decreases
Thesis (MS) — Boston College, 2013
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics
Pepper, Martin Bailey. "Magmatic History and Crustal Genesis of South America: Constraints from U-Pb Ages and Hf Isotopes of Detrital Zircons in Modern Rivers." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/347220.
Повний текст джерелаReid, Mattie Morgan. "Forearc basin detrital zircon provenance of Mesozoic terrane accretion and translation, Talkeetna Mountains-Matanuska Valley, south-central Alaska." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5611.
Повний текст джерелаBarbeau, David Longfellow Jr. "Application of Growth Strata and Detrital-Zircon Geochronology to Stratigraphic Architecture and Kinematic History." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/244092.
Повний текст джерелаMidwinter, Derrick. "Using Detrital-Zircon Geochronology and (U-Th)/He Thermochronology to Re-evaluate the Triassic-Jurassic Tectonic Setting of Northern Laurentia, Canadian Arctic." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35326.
Повний текст джерелаLinde, G. M., J. H. Trexler, P. H. Cashman, G. Gehrels, and W. R. Dickinson. "Three-Dimensional Evolution of the Early Paleozoic Western Laurentian Margin: New Insights From Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry of the Harmony Formation of Nevada." AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/626478.
Повний текст джерелаEly, Kim Susan. "Geochronology of Timor-Leste and seismo-tectonics of the southern Banda Arc." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/7063.
Повний текст джерелаU–Pb dating of detrital zircons from the Aileu Complex by LA-ICPMS show major age modes at 270–440 Ma, 860–1240 Ma and 1460–1870 Ma. The youngest zircon populations indicate a maximum depositional age of 270 Ma. The detrital zircon age populations and evidence for juvenile sediments within the sequence favours a synorogenic setting of deposition of sediments sourced from an East Malaya – Indochina terrane.
Previous uncertainty in aspects of the cooling history for the Aileu Complex is resolved with 39Ar/40Ar geochronology of hornblende. Cooling ages of 6–10 Ma are established, with the highest metamorphic grade parts of the Complex yielding the older ages. Cooling ages of 10 Ma imply that metamorphism of the Aileu Complex must have commenced by at least ~12 Ma. Metamorphism at this time is attributed to an arc setting rather than the direct result of collision of the Australian continent with the Banda Arc, an interpretation consistent with the new provenance data.
Geological mapping of Ataúro, an island in the volcanic Banda Arc north of Timor, reveals a volcanic history of bi-modal subaqueous volcanism. 39Ar/40Ar geochronology of hornblende from dacitic lavas confirms that volcanism ceased by ~3 Ma. Following the cessation of volcanism, coral reef marine terraces have been uplifted to elevations of 700 m above sea level. Continuity of the terraces at constant elevations around the island reflects regional-scale uplift most likely linked to sublithospheric processes such as slab detachment.
North of Timor, the near complete absence of intermediate depth seismicity beneath the inactive segment of the arc is attributed to a slab window that has opened in the collision zone and extends to 350 km below the surface. Differences in seismic moment release around this slab window indicate asymmetric rupture, propagating to the east at a much faster rate than to the west. If the lower boundary of this seismic gap signifies the original slab rupture then the slab window represents ~4 m.y. of subsequent subduction and implies that collision preceded the end of volcanism by at least 1 m.y.
Variations in seismic moment release and stress state across the transition from subduction of oceanic crust to arc–continent collision in the Banda Arc are investigated using earthquake catalogues. It is shown that the slab under the western Savu Sea is unusual in that intermediate depth (70–300 km) events indicate that the slab is largely in down-dip compression at this depth range, beneath a region of the arc that has the closest spacing of volcanoes in the Sunda–Banda arc system. This unusual state of stress is attributed to subduction of a northern extension of the Scott Plateau. Present day deformation in the Savu Sea region may be analogous with the earliest stages of collision north of Timor.
Neace, Erika R. "Zircon LA-ICPMS Geochronology of the Cornubian Batholith, SW England." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1448912006.
Повний текст джерелаVoice, Peter James. "The Global Detrital Zircon Database: Quantifying the Timing and Rate of Crustal Growth." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27785.
Повний текст джерелаPh. D.
Bootes, Nathaniel R. "Late Cenozoic Offshore Record of Exhumation and Sediment Routing in Southeast Alaska from Detrital Zircon U/Pb and FT double-dating." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592169111121451.
Повний текст джерелаPainter, Clayton S. "Sequence Stratigraphy, Geodynamics, and Detrital Geo-Thermochronology of Cretaceous Foreland Basin Deposits, Western Interior U.S.A." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/307071.
Повний текст джерелаQuinn, Ryan Joel. "THE EVOLUTION OF GRENVILLE BASEMENT IN THE EASTERN GREAT SMOKY MOUNTAINS; CONSTRAINTS FROM U-PB ZIRCON GEOCHRONOLOGY, WHOLE ROCK SM-ND, AND FELDSPAR PB GEOCHEMISTRY." UKnowledge, 2012. http://uknowledge.uky.edu/ees_etds/7.
Повний текст джерелаLoan, MaryEllen Louise. "New Constraints on the Age of Deposition and Provenance of the Metasedimentary Rocks in the Nashoba Terrane, SE New England." Thesis, Boston College, 2011. http://hdl.handle.net/2345/2422.
Повний текст джерелаThe Nashoba terrane of SE New England is one of three peri-Gondwanan tectonic blocks caught between Laurentia and Gondwana during the closure of the Iapetus Ocean in the early to mid- Paleozoic. U-Pb analyses (LA-ICP-MS) were carried out on zircon suites from the meta-sedimentary rocks of the Nashoba terrane. The youngest detrital zircons in the meta-sedimentary rocks of the Nashoba terrane are Ordovician in age. There is no significant difference in age between meta-sedimentary units of the Nashoba terrane across the Assabet River Fault Zone, a major fault zone that bisects the NT in a SE and a NW par. Zircon in meta-sedimentary rocks in the Marlboro Fm., the oldest unit of the Nashoba terrane, is rare, which may reflect the basaltic nature of the source material, and is commonly metamict. The Marlboro Fm. contained the oldest detrital grain of all the analyzed samples, with a core of ~3.3 Ga and rim of ~2.6 Ga indicating that it was sourced from Archaen crustal material. Detrital zircons from the Nashoba terrane show a complete age record between the Paleoproterozoic and Paleozoic that strongly supports a provenance from the Oaxiqua margin of Amazonia. The detrital zircon suite of the Nashoba terrane is distinct from both Avalonia and the Merrimack belt; however, they resemble zircon suites from Ganderia. This study proposes that the Nashoba terrane of Massachusetts correlates with the passive trailing edge of Ganderia. Finally, metamorphic zircon analyses of the terrane show that the Nashoba terrane experienced a peak in hydrothermal fluid infiltration during the Neoacadian orogeny
Thesis (MS) — Boston College, 2011
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Earth and Environmental Sciences
Ng, Wai Pan. "Petrogenesis, U-Pb zircon geochronology and tectonic evolution of the Malaysian granite provinces in the Southeast Asian tin belt." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:0f2f3942-6d64-4a17-b194-08672107aeb2.
Повний текст джерелаPerkes, Tyson L. "Integrating Facies Analysis, Terrestrial Sequence Stratigraphy, and the First Detrital Zircon (U-Pb) Ages of the Twist Gulch Formation, Utah, USA: Constraining Paleogeography and Chronostratigraphy." Diss., CLICK HERE for online access, 2010. http://contentdm.lib.byu.edu/ETD/image/etd3409.pdf.
Повний текст джерелаLoughry, Donald Franklin Jr. "ORIGIN OF BLUE RIDGE BASEMENT ROCKS, DELLWOOD QUAD, WESTERN NC: NEW EVIDENCE FROM U-PB ZIRCON GEOCHRONOLOGY AND WHOLE ROCK GEOCHEMISTRY." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/11.
Повний текст джерелаAsmussen, Pascal. "Insights from the Devonian Adavale Basin on the tectonic history of the Thomson Orogen." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/200906/1/Pascal_Asmussen_Thesis.pdf.
Повний текст джерелаNasdala, Lutz, Fernando Corfu, John W. Valley, Michael J. Spicuzza, Fu-Yuan Wu, Qiu-Li Li, Yue-Heng Yang, et al. "Zircon M127 - A Homogeneous Reference Material for SIMS U-Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis." WILEY-BLACKWELL, 2016. http://hdl.handle.net/10150/621937.
Повний текст джерелаLuo, Yan. "U-Pb age and Hf isotopic study of detrital zircons from the Liaohe Group constraints on the evolution of the Jiao-Liao-Ji Belt, North China craton /." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36639242.
Повний текст джерелаLuo, Yan, and 羅彥. "U-Pb age and Hf isotopic study of detrital zircons from the Liaohe Group: constraints on the evolution of theJiao-Liao-Ji Belt, North China craton." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36639242.
Повний текст джерелаLaurent, Antonin. "Etude pétrologique et chronométrique (U-Th-Pb) de la monazite et du zircon dans les granulites de ultra-haute température du Rogaland, Norvège." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30290/document.
Повний текст джерелаUnderstanding mountain building processes requires a better integration of petrological and peochronological data in order to link pressure-temperature paths to absolute ages. This work focuses on the behaviour of monazite and zircon, which are used as geochronometers, in ultra-high temperature granulites of Rogaland (South Norway). We show that linking in-situ U-Th-Pb dating of monazite with its major- and trace-element composition lead to the recognition of two ultra-high temperature (UHT) metamorphic events in Rogaland at c.1030-1005 Ma and c. 940-930 Ma. Indeed, the examination of monazite-xenotime-huttonite phase relationships suggests that monazite may record crystallization age at or near ultra-high temperature. Besides, the chemical and U-Th-Pb-O isotopic characterization of zircon neo-crystallization or overgrowths indicates that the Rogaland crust remains molten (> 800 °C at 0.7-0.4 GPa) at least during 60 My between the two identified UHT excursions. This manuscript also highlights the various factors responsible for U-Th-Pb (partial) resetting in the course of granulite facies metamorphism. Zircon behaviour is mostly controlled its level of amorphization, enhancing Pb loss during annealing, whereas monazite resetting is dominated by dissolution-precipitation processes in the presence of a melt or fluid phase. More specifically, we point out that monazite may be used to monitor the redox conditions of its crystallizing medium since monazite may incorporate the redox-sensitive element S in its lattice as sulphate. Finally, we demonstrate a spatial and temporal correlation between magmatism and UHT metamorphism in Rogaland. The timescale, P-T path and tectono-magmatic history however cannot be explained by currently accepted models for UHT. We suggest that physical and thermal specificities of Proterozoic mantle may explain the observed ultra-hot orogen style and the occurrence of gravity driven processes during orogeny
Jones, Carson L. "U-Pb geochronology of monazite and zircon in Precambrian metamorphic rocks from the Ruby Range, SW Montana deciphering geological events that shaped the NW Wyoming province /." [Kent, Ohio] : Kent State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1214308001.
Повний текст джерелаTitle from PDF t.p. (viewed Oct. 5, 2009). Advisor: Peter Dahl. Keywords: Geochronology; Radiometric Dating; Plate Tectonics. Includes bibliographical references (p. 106-109).
Sakata, Shuhei. "Development of analytical technique for precise age determination of Quaternary zircons with the correction of the initial disequilibrium on U-Th-Pb decay series using a laser ablation-ICP-mass spectrometry." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199112.
Повний текст джерелаGhosh, Amiya Kumar. "Reconnaissance U-Pb geochronology of Precambrian crystalline rocks from the northern Black Hills, South Dakota: Implications for regional thermotectonic history." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1240007954.
Повний текст джерелаTitle from PDF t.p. (viewed Feb. 12, 2010). Advisor: Peter Dahl. Keywords: Black Hills; Crook Mountain granite; Homestake gold mine; gold mineralization; magmatism; metamorphism; metapelite; g monazite; zircon; titanite; geochronology; thermotectonism Includes bibliographical references (p. 97-106).
Borgo, Ariadne. "Le gisement d’or du Tocantinzinho (province aurifère du Tapajós) relations entre déformation, hydrothermalisme et minéralisation." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT078/document.
Повний текст джерелаThe Tocantinzinho deposit is located on the Tapajós Gold Province and is the largest gold deposit within Province, with 53,9 tons of gold. Its formation begins with a granodioritic magmatism around 2005Ma, followed by a granitic magmatism 10 Ma latter. The Tocantinzinho granite is composed by two main facies, syenogranite (1996±2Ma) and monzogranite (1989±1Ma), and by aplite and pegmatite bodies, suggesting a fluid-rich magmatism at shallow depth. Andesite dikes (1998±8Ma) are intrusive in both rocks. Sharp fragments of those rocks along contacts and minor mingling with granitic magma suggest a multiphase magmatism at distinct timing. The first dikes have intruded within granite when it was crystalizing, thus a minimum age of 1975Ma was estimated. Cooling rates of plutonic rocks vary from 3.6 to 14.7°C/Ma, with an average of 7.5°C/Ma, suggesting vertical exhumation processes were minor. The elongated geometry of granite along with sin-magmatic strike-slip tectonics of andesite corroborate the predominance of horizontal movements. Geochemical analysis show high-K calk-alkaline affinity and niobium anomaly indicator of two possible geotectonic settings for these rocks: Andean-type continental arc or post-collisional one. Considering the genetic relationship between magmatism, strike-slip faults, and low cooling rates, a post-collisional setting is more likely. The geochemical signature, ages and style of tectonism allow us to compare those rocks with the ones from Creporizão Intrusive Suite (1997-1957Ma). Dacite dikes (1992±2Ma) cut across all other rocks, but the temporal relationship among them remains misunderstood, due to the geochemical signature similar to the anorogenic rocks, suggesting it belongs to a distinct and latter magmatic series. Indeed, the dated zircons were probably inherited from host rocks. The mineralized area is restricted to a domain constrained by two major sinistral strike-slip N100°-130E°E faults that comprises the Tocantinzinho granite and sub-volcanic rocks, which were hydrothermally altered, brittle deformed and mineralized during two phases. The first one is characterized by breccias and microfractures infilled with muscovite (1864±5Ma) and pyrite, which contains low gold grades and are restricted to the Tocantinzinho granite. The second phase was controlled by strike-slip and normal tectonics generating tension gashes veins and pull apart breccias infilled with quartz, chlorite, calcite, albite, rutile, pyrite, galena, sphalerite, chalcopyrite, and gold. The gold grade can reach up to 70 ppm in some sulfide-rich veins. These structures are parallel and mainly trends N30-60°E, showing textures and orientated minerals typical of syn-tectonic infilling. Based on petrographical features and argon ages two hypothesis were proposed for the ore genesis: the first one consider a genetic relationship between magmatism and ore fluids for first mineralization stage and the second hypothesis consider a reactivation of pre-existing faults by an extensional tectonism related to the Maloquinha Intrusive Suite magmatism (ca.1880Ma) for this phase. The second mineralization phase is considered as formed as consequence of tectonic reactivation at ca. 1880Ma, in both hypothesis. Both phases in both hypothesis were classified as magmatic-hydrothermal ore mineralization and might be classified as intrusion-related gold systems. However, new field works are important in order to identify and characterize the nature and source of hydrothermal fluids, as well as ore dating and new geochemical and geochronological data of sub-volcanic rocks are imperative to better understand the genesis and evolution of the Tocantinzinho gold deposit. Such results, strongly linked to the fact that the tectonic control seem significant, may help for future exploration and exploitation programs
Sanchez, Lohff Sonia K. "Upper plate response to varying subduction styles in the forearc Cook Inlet basin, south-central Alaska." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1530270586819066.
Повний текст джерелаHarrison, Bianca. "Palaeoenvironments and position of the Precambrian–Cambrian boundary within the lower Vanrhynsdorp Group of South Africa: sedimentary facies analysis, U-Pb series zircon geochronology and micropalaeontology." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29450.
Повний текст джерелаAlbardeiro, Luís José de Sousa. "Aplicação da geocronologia U-Pb em zircão a areias e rochas do substrato do litoral do sudoeste de Portugal: implicações para a proveniência, dinâmica sedimentar e história geológica da região." Doctoral thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/18275.
Повний текст джерелаCanile, Fernanda Maciel. "Geologia isotópica em zircões detríticos (U-Pb, Hf e O) e em rocha total (Sm-Nd e Pb-Pb) das rochas da Bacia do Paraná em Santa Catarina." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-24022016-140417/.
Повний текст джерелаU-Pb, Hf and O isotope data were obtained from detrital zircons from late Paleozoic-early Mesozoic units from Paraná Basin, southeastern Brazil, in order to constain the provenance of the sediments, as well as to contribute to the understanding of the tectonic evolution of the basin. Whole rock Sm-Nd and Pb-Pb isotopic signatures were also taken in order to help the interpretation. The studied section, White Column in Santa Catarina state, includes rocks from 11 stratigraphic units (from base to top): Rio do Sul Formation, Rio Bonito Formation (Triunfo, Paraguaçu and Siderópolis members), Palermo Formation, Irati Formation, Serra Alta Formation, Teresina Formation, and Rio do Rasto Formation (Serrinha and Morro Pelado members) and Botucatu Formation. U-Pb ages were obtained on 1941 detrital zircons and range from 242 Ma to 3400 Ma. All sedimentary units show four main detrital age groups, Neoarchean (2700-2500 Ma), mid-Paleoproterozoic (2000-1800 Ma), Grenvillian (1100-900 Ma) and Brasiliano (850-490 Ma), reflecting the importance of the Precambrian basement bordering the east side of the basin, such as Dom Feliciano, Kaoko and Namaque-Natal Belts as source areas, including the local basement that was dated at 584 Ma. The Siderópolis Member shows an important change in the source of sediments with a Permian age-peak (266 to 290 Ma). This age-peak persists towards the top of the section until the Botucatu Formation. O and Hf isotopic signatures from the detrital zircons show that a portion of the mid-Paleoproterozoic grains is probably from rocks of the presently covered basement, which was exposed until the deposition of the Rio Bonito Formation. O and Hf isotopes also show that some Grenvillian aged zircons are from Argentinian rocks, which implies a long transport distance. Isotopic signatures of part of the Permian grains also link them to sources from Argentina and Chile, and part of these grains has more rounded shapes, suggesting that they reached the basin after long distance traveling on subaquatic environment and nor only through the air (ash falls) as it is commonly accepted. Other younger age peaks (Ordovician to Carboniferous) found from Palermo Formation upsection are also linked to Argentinian and Chilean sources, showing the importance of distant sources during the filling of the basin. The Sm-Nd and Pb-Pb data on whole rocks show that the sediments from the Paraná Basin present predominance of sources with crustal origin. Osotopic signatures are similar to granitoid rocks from Santa Catarina, Ribeira Belt, Brazilian Shield, Namaqua-Natal and Kaoko Belts, as well as the Arequipa-Antofalla terranes (Andes basement) and granitoids from North Patagonia. These data corroborate the observed detrital zircon patterns thar point to both proximal and distal source areas. \'T IND.DM\' model ages older than 1.4 Ga and more negative (-10 to -15) epsilon values were observed in the lower units (Rio do Sul Formation to Paraguaçu Member), while the upper units show \'\'épsilos\' IND.Nd(0)\' values ranging from -6 to -12 and \'T IND. DM\' model ages younger than 1.5 Ga, corroborating the addition of a younger source starting from the Siderópolis Member deposition upwards, as noted by detrital zircon data (Permian age-peak).
Caquineau, Tom. "Etude géochronologique U-Pb et isotopique Lu-Hf sur zircon du groupe de Turee Creek : implications sur l’événement de grande oxygénation et les glaciations paléoprotérozoïques." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC236/document.
Повний текст джерелаThe Archean – Proterozoic transition at 2.45 Ga is marked by major environmental changes in Earth’s history (atmosphere oxygenation and global glaciations). The origin and the relationships between these events are debated. Sedimentary sequences that record these events have been widely studied in North America (Huronian sequence) and South Africa (Transvaal). An analog sequence in the Pilbara craton in Western Australia (Turee Creek Group, TCG) contains 3 glacial horizons. 3 continental drill cores (Turee Creek Drilling Project, TCDP) were performed in order to investigate the sequence. U-Pb geochronology of monazite and zircon from drill core and surface samples allows to date the first paleoproterozoic glaciation at 2.45 Ga and a second glacial event at ~2.34 Ga. Re-Os analyses of pyrites from the second diamictite yielded an isochron at 2.31 Ga. These results enable to propose a correlation scenario of the paleoproterozoic glacial events recorded on different continents. A ‘Snowball Earth’ would have occured at 2.45 Ga at least on 5 cratons. A second glaciation could have occured at ~2.31 Ga on 4 cratons. Detrital zircons age spectrum highlights age peaks at 2.45, 2.54, 2.68, 2.82, 2.95 and 3.2 Ga. A crystal of Hadean zircon was discovered and indicate the existence of a probable differentiated crust within the Pilbara craton at 4.0 Ga. 70% of the analyzed zircons have juvenile Hf isotope composition, suggesting that the TCG incorporated volcanic material from continental large igneous provinces through the erosion of the underlying Hamersley and Fortescue groups
Ver, Hoeve Thomas James. "Applications of LA-ICP-MS analysis to zircon : assessing downhole fractionation and pre-treatment effects for U-Pb geochronology and trace element variations in accessory minerals from the Bushveld Complex." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60201.
Повний текст джерелаScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Teixeira, Alice Westin. "O Grupo Carrancas e a frente da Nappe Andrelândia na borda sul do Cráton do São Francisco: Proveniência sedimentar e implicações tectônicas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-26092012-150855/.
Повний текст джерелаThe Carrancas Nappe System composes a system of nappes that surround the southern margin of the São Francisco Craton and is formed by the Biotite Schist Unit and by the Campestre and São Tomé das Letras formations of the CarrancasGroup. The Biotite Schist Unit encompass quartz veins and anastomosed schistosity and is formed by quartz, biotite, muscovite, chlorite and, locally plagioclase, carbonate and garnet. The Campestre Formation is composed by interleaved quartzites and phyllite/schist that varies from graphite-chloritoid phyllites, with muscovite, quartz, tourmaline and garnet, and locally garnet schists and schists with garnet, staurolite and kyanite. The investigation of the Biotite Schist Unit as authochtonous in relation to the São Francisco Craton, it´s potencial grouping with the Carrancas Group in a deposicional megassequence, as well as it´s comparison with the allochthonous Santo Antônio Schist (Andrelândia Nappe) is part of the goals of this study. For this purpose, chemical and isotopic (Sr and Nd) whole rock analysis were obtained, along with U-Pb detrital zircon data, in the Biotite Schist Unit and also in the Campestre Formation, in order to elucidate the relationship between these units and compare them with literature data available for theSanto Antônio Schist. The Biotite Schist Unit show chemical characteristics compatible with sediments that underwent chemical weathering of moderate intensityand time, deposited in continental collision setting, with source region composed essentially by felsic rocks. Trace elements and Sr isotopic signatures ( \'ANTPOT.87 Sr\'/\'ANTPOT. 86 Sr\' between 0,713 and 0,715) and Nd (\'\'épsilon IND.Nd\' between -6 and -5) points to contribution from magmatic arc and continental crust, and are different from the expected for passive margin settings. The same contribution is observed in the Santo Antônio Schist, which source area registers an important juvenile material signature. The U-Pb LA-MC-ICP MS zircon data show major contribution from rocks of the later Cryogenian and minor contribution from the Ryacian. The modal class around 655 Ma is comparable with the U-Pb detrital zircon data from the Santo Antônio Schist, pointing to the same source area for both units. The deposition of the precursors sediment of the Biotite Schist Unit occurred between 630 - 611 Ma, and the main sources were the calk-alcaline granulites and co-genetic volcanic rocks, besides the Socorro-Guaxupé Nappe sin-collisional granites. The low representation of Paleoproterozoic ages and the absence of passive margin chemical signatures preclude the rocks of the São Francisco Craton as part of the source area. Thus, Biotite Schist Unit is not an autochthonous unit in relation to the São Francisco Craton, and is, potentially, the unit that composes the Andrelândia Nappe front. On the other hand, the Campestre Formation has geochemical signatures of sediments that underwent intense recycling and alteration of the original sediment. The trace element and Sr and Nd isotopic signatures indicates upper continental crust contribution, with older crust component and no affinity with passive margin sediments ( \'ANTPOT.87 Sr\'/\'ANTPOT. 86 Sr\' between 0,74 and 0,76; \'épsilon\' IND.Nd\' between -18 and -15). The U-Pb LA-MC-ICP MS detrital zircon data provide varied ages, from the Tonian to the Mesoarchean, correlated withvolcanic and plutonic rocks of the São Francisco Craton, with the marginal belts of the Angola Craton, and/or orogenic belts of the Amazonian Craton and with the Mara Rosa and Goiás magmatic arcs. The range of the U-Pb ages of the Campestre Formation and the Chapada dosPilões and Paracatu formations, allows the correlation, in the Brasília Orogen, of the Campestre and Canastra groups. The most likely paleogeography is that of a rift setting, before the continental drift and the establishment of a passive continental margin.
Brezina, Cynthia A. "The detrital mineral record of Cenozoic sedimentary rocks in the Central Burma Basin : implications for the evolution of the eastern Himalayan orogen and timing of large scale river capture." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/6730.
Повний текст джерелаKuiper, Yvette Dominique. "Isotopic constraints on timing of deformation and metamorphism in the Thor–Odin dome, Monashee Complex, southeastern British Columbia." Thesis, Department of Geology, University of New Brunswick, 2003. http://hdl.handle.net/1882/46.
Повний текст джерелаMonazite crystals in pelitic schist, quartzite and orthogneiss, which have U–Pb ages younger than 40Ar/39Ar hornblende ages in amphibolite in northwest Thor–Odin, may have grown during tension in the presence of fluids. Titanite, xenotime and zircon dates may be interpreted in the same way. Thus, the U–Pb dates that were previously interpreted as representing peak of metamorphism and the hornblende 40Ar/39Ar dates that were previously interpreted as representing cooling ages, may be interpreted as reflecting meteoric fluid penetration of the crust during regional extension. This implies that the age of the thermal peak of metamorphism is older than ~75–70 Ma. Migmatisation in a basement orthogneiss in Thor–Odin occurred at ~1.8 Ga. Dissolution rims are preserved in zircon between ~1.8 Ga domains and 52 Ma overgrowths. Because growth of new zircon (and possibly other U–Pb accessory phases) did not take place, any geological event that occurred during the ~1.8 Ga to 52 Ma time interval is not recorded. Cordilleran deformation and metamorphism may have taken place within that time interval, e.g. in the Middle Jurassic and/or mid- to Late Cretaceous, the time of Cordilleran deformation and metamorphism in the rocks overlying the Monashee Complex.
The Joss Mountain orthogneiss, west of the Monashee Complex in the Selkirk Allochthon, is dated at 362 +/– 13 Ma. F3 folding in pelitic schist at Joss Mountain is constrained between ~73 and ~70 Ma. Existing structural, metamorphic and geochronological data in, and close to, the Shuswap Metamorphic Complex in the southern Canadian Cordillera are shown to be consistent with a channel flow model.
Andersson, Barbro. "Metamorphic Evolution of the Tjeliken Garnet-Phengite Gneiss, Northern Jämtland, Swedish Caledonides." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-276515.
Повний текст джерелаDen skandinaviska fjällkedjan, vetenskapligt benämnd de skandinaviska Kaledoniderna, har bildats på samma sätt som Himalaya och har därför liknande uppbyggnad. Från början tros fjällen ha varit av samma storlek som Himalayas berg. Deras ålder på cirka 400 miljoner år gör dock att miljontals års påverkan från vatten och vind har eroderat ner dem till dagens betydligt lägre fjäll. Den bergsyta vi ser idag utgör därför vad som från början var fjällkedjans kärna. Därför utgör de skandinaviska Kaledoniderna en unik möjlighet att studera en bergskedjas inre, vilket kan ge viktig information om bergkedjebildande processer.Forskning har visat att fjällkedjan bildades då Japetushavet mellan kontinenterna Baltika och Laurentia stängdes. Detta resulterade till slut i en kollision mellan de två kontinenterna där stora flak (skollor) av mellanliggande havsbotten och kontinentalskorpa transporterades hundratals kilometer upp på Baltika. Skollorna utgör idag våra fjäll. Känt är också att innan kontinentalkollisionen så kolliderade Baltika med öar i havet, varvid dess kontinentalkant pressades djupt ner under jordskorpan, ända ner i manteln. Bevis för detta återfinns idag i Sevesskollan ibland annat de jämtländska fjällen i form av högtrycksbergarter. Dessa har bildats under de höga tryck och temperaturer som råder på stora djup i jordens inre. Genom att studera högtrycksbergarter kan man förstå fjällkedjans bildande. Fjället Tjeliken i norra Jämtland är en av de idag kända fyndplatserna av högtrycksbergarter. Dess topp består av bergarten eklogit och dess lägre delar av gnejs, samt kvarts. Tidigare studier av eklogiten visar att den har bildats vid tryck och temperatur på cirka 2.6 GPa och 700 °C, vilket motsvarar att den varit nedpressad cirka 80 km under jordytan. Den exakta tidpunkten då detta skedde har inte kunnat fastställas då olika dateringsmetoder gett olika resultat mellan cirka 464 till 446 miljoner år sedan. I denna studie studeras tryck- och temperaturförhållanden för gnejsen som jämförelse till eklogiten, för att kunna fastställa om de båda bergarterna har genomgått samma bildningsprocesser. En ny datering genomförs också för att bättre kunna fastställa tidpunkten för högtrycksfasen.Datering baserat på radioaktivt sönderfall av uran till bly i mineralet zirkon visar att högtrycksfasen inträffade för cirka 460 miljoner år sedan. Modellering baserat på termodynamiska principer visar att kärnorna i mineralet granat bildades inom tryck- och temperaturområdet 1.9–2.6 GPa och c. 680-700 °C. En komplex kemisk zonering av granaterna indikerar att de möjligen bildades under flera tillväxtfaser, vilka inom ramen för denna studie inte kunnat modelleras, då mer avancerade metoder krävs. Denna studie visar dock att eklogiten och gnejsen sannolikt delar en gemensam tryck- och temperaturhistoria, vilken är relaterad till den djupa nedpressningen av Baltikas kontinentalkant under sen ordovicium. Dateringen stödjer även övriga åldersdateringar i området av högtrycksfasen.
Weller, Owen M. "An integrated metamorphic and geochronological study of the south-eastern Tibetan plateau." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:f4104b43-389a-4d54-bd7b-ba3fc0e8ab95.
Повний текст джерелаSuzuki, Kazuhiro, and Mamoru Adachi. "Th, U and Pb analytical data of monazites and zircons used in the paper ”Middle Precambrian detrital monazite and zircon from the Hida gneiss on Oki-Dogo Island, Japan : their origin and implications for the correlation of basement gneiss of Southwest Japan and Korea”." Dept. of Earth and Planetary Sciences, Nagoya University, 1994. http://hdl.handle.net/2237/2821.
Повний текст джерелаMickey, Jeremiah Lee. "Determining the Laurentide Ice Sheet and Bedrock Provenance of Midwestern Till by Applying U-Pb Geochronology to Detrital Zircons." Thesis, 2019. http://hdl.handle.net/1805/21294.
Повний текст джерелаA broad range of samples were collected from the Huron-Erie Lobe, Lake Michigan Lobe, Saginaw Lobe, and Tipton Till Plain of northern Indiana to determine the provenance of Laurentide Ice Sheet till in the Midwest U.S. during the Illinoian and Wisconsinan glaciations. U-Pb age distributions from approximately 300 detrital zircons (DZ) were used as provenance indicators for each till sample. Till from the Lake Michigan Lobe and was found to be largely homogenized. The distinct lobe DZ age distributions are the Lake Michigan Lobe till with a dominant ~1465 Ma peak, the northern Huron-Erie Lobe till with a dominant ~1060 Ma and a secondary peak at ~1450 Ma, the southern Huron-Erie Lobe till with nearly equal peaks at ~1435 Ma, ~1175 Ma, and ~1065 Ma, and the southern Saginaw Lobe till with a dominant peak at ~1095 Ma. Those four DZ age distributions were treated as endmembers in a nonlinear least-squares mixing model to calculate the contribution of each lobe to till in the Tipton Till Plain. Huron-Erie and Saginaw lobe tills were found to be the primary components of the Tipton Till Plain, and Lake Michigan Lobe till was only found in the western Tipton Till Plain. Zircons from the Saginaw Lobe till increased 39 % in the eastern Tipton Till Plain between the Illinoisan and Wisconsinan glaciations. The mixing model was also applied to relate the DZ age distributions of the lobes to bedrock within and near their flow paths. When comparing nearby bedrock to each lobe’s till, mixing model results, yield an approximate maximum transport distance between 500 and 630 kilometers for the matrix vii fraction of till in the Lake Michigan, Huron-Erie, and Saginaw lobes. Samples for the southern Huron-Erie Lobe indicate that the most of the zircon ages within the southern Huron-Erie Lobe till in Indiana were specifically entrained between Niagara County, New York and east-central Indiana. Within the model’s error, 93 – 100 % of the detrital zircons in each of the three lobes are relatable to nearby Paleozoic and Precambrian sedimentary and metamorphic bedrock formations.
Huang, Yi-Chang, and 黃奕彰. "Detrital zircon U-Pb geochronology constraint on the formation age of the Tananao Schist and tectonic implication, Taiwan." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70825041457560846349.
Повний текст джерела國立臺灣大學
地質科學研究所
103
The Tananao Schist, the oldest rock, exposed at the Backbone Range which consists of marble, schist, gneiss, and subordinate scattered metabasites. According to the stratigraphy and structural analysis, the Tananao Schist in the ascending order can be divided into the Chiuchu Marble, the Kuyuan Schist, the Paiyang Schist, the Tienchang marble, and the Pilu Formation. Based on previous study, depositional age of the Chiuchu Marble is closed to 250±20 Ma(Late Permian). Using zircon U-Pb dating method, magmatic age of gneiss (I-type granite) yields 90- 86 Ma. Depositional age of schist formation was difficult to define because fossils were poorly-preserved. In present study, we try to use detrital zircon U-Pb dating to yield the maximum depositional age of schist. In this study, the youngest weight mean ages of the Paiyang Schist and Pilu Formation in western part of Tailuko belt are 180-135 Ma, which are older than the Kuyuan and Paiyang Schists exposed in eastern part of the Tailuko belt. Based on macroscopic structure of straitigraphy, microscopic structure analysis, and metamorphic facies, stratigraphy in western part of the Tailuko belt is younger than that in eastern part. Source of the Tarluko belt mainly derived from ignous rock of the Mesozoic basement in Taiwan Strait. Stratigraphy in western part of the Tailuko belt lacks younger detrital zircons because of reverse exhumation. The chemical composition of the metabasites of the Tailuko belt was suggested that they were relics of oceanic crust. But in our study, 90-80 Ma metabasite intruded into Chiuchu Marble probability represts for fractions of metabasites of the Tailuko belt might form in origin of continental crust. More detail chemical analysis and examinations are necessary in the future. Results as above mentioned, we explain tectonic setting of the Tananao Schist. Taiwan region was located on passive continental margin and deposited carbonates during late Permian period. The paleo-Pacific plate westward subducted to the Cathaysia Block along continental margin, and the carbonates are metamorphosed to marble since early Jurassic. The subduction related metamorphism is called the Tailuko orogeny. Clastic sediments were unconformably deposited on the Chiuchu Marble during early Cretaceous. At the same time, the island arc migrated from southeastern China to Taiwan Strait because of the retreating arc system. And then, I-type granite and mafic igneous rock intruded into marble and clastic sediments of Taiwan during 90-86 Ma. Afterwards, clastic sediments were deeply buried caused by continuing subduction and metamorphosed. The metamorphic event is known as the Nanao orogeny.
Trestrail, J. L. "U-Pb detrital zircon, geochemical and Nd isotope constraints on sedimentary provenance of the Chewings Range Quartzite, Warumpi Province, Arunta Region, NT." Thesis, 2010. http://hdl.handle.net/2440/106279.
Повний текст джерелаThe Chewings Range Quartzite is a meta-sedimentary cover sequence located in the Warumpi Province of the Arunta Region. U-Pb detrital Zircon analysis of the Chewings Range Quartzite indicates a minimum depositional age of ~ 1640Ma, with the main population of zircons residing within a range of 1700 – 1800Ma. Evidence from Sm-Nd isotopic data suggests that a series of Staurolite Garnet Schists, often grouped with the Chewings Range Quartzite, has a significantly more juvenile character. This suggests that it may represent a new unit with a significantly differing provenance to that of the Chewings Range Quartzite. Combined REE, geochemistry and detrital zircon dating suggests that the Chewings Range Quartzite was derived primarily off the Arunta Region and North Australian Craton, while the Stauralite Garnet Schists holds more affinity with juvenile Musgrave Province to the south.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2010
Chou, Hsien-Yuan, and 周賢元. "Detrital zircon U-Pb geochronology of the Eocene to Pliocene Series in central Taiwan: Implications for source provenance and exhumation history." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/68841602653829555873.
Повний текст джерела國立臺灣大學
地質科學研究所
101
Detrital zircons collected from sedimentary rocks can find out exhumation history for the U-Pb dating. This study aims to reconstruct the Eocene–Miocene exhumation history of the southeast China by using U-Pb detrital zircon geochronology. The samples were collected from the Eocene-Miocene formation along the Beigang river and the upper Miocene formation from the Daan river. Each sample contains about 80-100 zircons U-Pb dating data with LA-ICPMS. Zircon formed from igneous activity or metamorphism of the source province. U-Pb dates are distributed to several groups according to the major geological movement in southeast China, (1) Wutai orogeny (2400-2600 Ma) (2) Luliang orogeny (1700-1900 Ma) (3) Sibao orogeny (930-1000 Ma) (4) Jinning orogeny (700-850 Ma) (5) Caledonian orogeny (400-450) (6) Indosinian orogeny (200-250 Ma) (7) Early Yanshanian orogeny (200-145) (8) Late Yanshanian orogeny (Ⅰ) (100-145 Ma) and (9) Late Yanshanian orogeny (Ⅱ) (100-65 Ma) (10) continental rifting period (65-8Ma). Age spectrum analyses of the Eocene formation indicates that the major proportion is the Late Yanshanian orogenyⅠgroup, about 12%-22%; the major proportion of the Oligocene formation is the Late Yanshanian orogenyⅠgroup, about 23%-36%; the major proportion of the Miocene formation is the Luliang movement group about 10%-23%. The Major proportion of Yanshanian orogeny (Ⅰ) group shows the increasing in the Eocene to the Oligocene formations, but the decreasing in the Miocene formation means that Late Yanshanian orogeny (Ⅰ) period rock eroded and reduced the exposed area during the Miocene period; The Luliang movement group proportion of Miocene formation data is increasing, and it means that the younger rocks eroded causes older rocks exposed. The youngest zircon age can be a corroboration of sedimentary age of sedimentary rock, 39.3±0.8 Ma of the Eocene formation, 27.4±0.6 Ma of the Oligocene formation, 26.7±0.6 Ma of the Miocene formation that confirms the previous reports of the age of sedimentary rocks. Keywords: Central Taiwan, detrital zircon, U-Pb datimg
Meaney, Kieran James. "Proterozoic crustal growth in the southeastern Gawler Craton: the development of the Barossa Complex, and an assessment of the detrital zircon method." Thesis, 2017. http://hdl.handle.net/2440/114255.
Повний текст джерелаThesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Physical Sciences, 2018
Kolesik, P. "U–Pb geochronology of volcano–sedimentary moraine sediments of the Bunger Hills: implications for Mesoproterozoic evolution of East Antarctica." Thesis, 2016. http://hdl.handle.net/2440/120941.
Повний текст джерелаThe Bunger Hills and adjacent areas of Wilkes Land and Queen Mary Land occupy the very western periphery of the Musgrave–Albany–Fraser Orogen, and represent one of the few exposures within east Antarctica with direct correlations to Australian constituent terrains of this continental-scale system. U–Pb analyses of detrital zircons from volcano–sedimentary moraine sediments of the Bunger Hills yield concordant 206Pb/238U ages ranging from ca. 1364 Ma to ca. 1040 Ma (n = 842), with a main late Mesoproterozoic magmatic zircon population clustered at ca. 1179–1161 Ma. Strong parallels with the time profile of in-situ rocks from the Stage 2 Albany–Fraser Orogen (AFO), the Bunger Hills and Windmill Islands, suggest these were the likely provenances for the associated moraine detritus. The Bunger Hills lie downstream from outcrops of the geographically inaccessible Sandow Group, which comprises clastic and mafic volcanoclastic rocks. It is interpreted that the sedimentary moraine materials of the Bunger Hills were derived from the glacial erosion of the Sandow Group supracrustal successions. The lithological character, sedimentary fill pattern and advanced diagenesis suggest that the Sandow Group formed within an active intra-continental rift-basin and represents the upper-crustal expression of extensional tectonism. Reconnaissance U–Pb geochronology of authigenic titanite suggests basin development occurred close to or within the time frame of the high-grade metamorphism recorded in the Bunger Hills. Therefore basin development was probably directly associated with the second major thermo–tectonic phase of the AFO (Stage 2; ca. 1215–1140 Ma). Due to the essentially non-metamorphosed volcano–sedimentary nature of the detritus in the sedimentary rocks, it seems likely that the evolving Mesoproterozoic orogenic system was not deeply exhumed during basin development.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2016
Li, Shih-Chuan, and 李時全. "Detrital zircon U-Pb geochronology of the Late Miocene-Pleistocene formations in the Northern Taiwan to source provenance and the unroofing history of Taiwan orogenic belt." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qxs4s7.
Повний текст джерела國立臺灣大學
地質科學研究所
106
Lithostratigraphy, magnetostratigraphy, depositional environment and sandstone compositions of foreland basin deposits in western Taiwan, from late Miocene to Pleistocene strata, have been systematically researched. According to the petrographic studies of foreland basin deposits, sedimentary provenance originated from southeastern China (the Cathaysia Block) in Eocene-Miocene, but progressively switched to Taiwan orogenic belt due to the arc-continental collision since late Miocene (~6.0 Ma). Furthermore, the Hsuehshan Range and the Western Foothills were uplifted and eroded in sequence during Pliocene to Pleistocene. In this study, we focus on detrital zircon U-Pb dating and petrographic analysis of sandstones collected from late Miocene to Pleistocene strata, aiming to understand the origin of sedimentary provenance and the exhumation history of the western flank of Taiwan orogenic belt. The results of petrography show that sedimentary and low-grade metamorphic lithics fragments gradually increased from late Miocene to Pleistocene in sequence. In addition, the detrital zircon U-Pb age populations of late Miocene-Pleistocene strata are similar to those of Eocene-Miocene strata, suggesting that the synorogenic sediments from late Miocene to Pleistocene were derived from the orogenic belt. Based on the characteristics of U-Pb ages, lithology and metamorphic grade of Eocene-Miocene strata, we classified the provenances into Eocene, Oligocene and Miocene formations. We utilize statistical analysis to quantify the proportion of the exposed provenances of each sample, which can reveal the relation between source and sink thoroughly. In northern Taiwan, the Hsuehshan Range was uplifted during late Miocene. Foreland basin received the sediments from the Miocene strata of Hsuehshan Range since Pliocene. During early Pleistocene (2.6-2.3 Ma), Oligocene strata of Hsuehshan Range started to expose and had 1-9% proportion among the source area. Subsequently, Oligocene strata widely exposed after 2.3 Ma (with 17-40% proportion among the source area). The drainage system have begun to carry the sediments from Eocene strata of Hsuehshan Range (1-9% proportion among the source area) since late Pleistocene (~1.46 Ma). After that, Eocene strata widely exposed (with 28% proportion of the source area) in the meantime as Linkou formation deposited. In central Taiwan, the Hsuehshan Range was also uplifted during late Miocene. Foreland basin also received the sediments from the Miocene strata of Hsuehshan Range since Pliocene. During early Pleistocene (2.1-1.0 Ma), Oligocene strata of Hsuehshan Range started to expose and had 5-15% proportion among the source area. Eocene strata of Hsuehshan Range started to widely expose since late Pleistocene (~1.0 Ma) with 46% proportion among the source area. During 1.0-0.7 Ma, the sum of proportion of Eocene and Oligocene strata gradually decreased (from 60% to 23%), in converse, proportion of Miocene strata gradually increased (from 40% to 77%), which suggested that the Miocene strata of Western Foothills were widely eroded. According to the statistical analysis of the upper Toukoshan deposit (~0.7-0.3 Ma), the proportion of the provenances were similar to the framework of mountain nowadays.
Al-Kiyumi, M. "Constraining the age and provenance of the basal quartzites of the Centralian Superbasin." Thesis, 2018. http://hdl.handle.net/2440/130321.
Повний текст джерелаThe Heavitree Formation of the Amadeus Basin, central Australia, is thought to correlate with a number of similar formations in the Officer, Ngalia, Georgina and Murraba Basins that formed the Centralian Superbasin. The Jasper Gorge Formation of the Victoria Basin and Jamison Sandstone of the Beetaloo Sub-basin are also thought to be corollaries. These formations are all constrained to being younger than ca. 1.0 Ga by U-Pb detrital zircon studies. However, in all cases, this is suspected to considerably pre-date the timing of deposition. Here, we present new U-Pb and Hf data from seven samples of the Amadeus Basin Heavitree Formation to a) better constrain the age of the Heavitree Formation, b) investigate the spatial variation in provenance of the Heavitree Formation, and, c) compare it with other ‘Supersequence 1’ quartzites from the wider Centralian Superbasin.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2018
楊智宇. "Detrital Zircon U-Pb Age Study of the Guizhulin Formation in Miaoli." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98271288484313183935.
Повний текст джерела國立臺灣師範大學
地球科學系
101
The sediments of the Kueichulin Formation were deposited during Late Miocene to Early Pliocene. This formation should be able to shed some lights on the records of the transition from passive margin to foreland basin sedimentary environment in western Taiwan. This study presents U–Pb dating results of detrital zircons by single collector Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) to investigate the evolution of sedimentary source region during the deposition of the Kueichulin Formation near Chuhuangkeng Anticline in Miaoli. Samples were collected all the way from the Miocene Peiliao Sandstone to the Pliocene Chinshui Shale. The U-Pb dating of zircons from the Early Miocene Peiliao Sandstone to the Late Miocene Tongken Fomation display age spectra with similar major peaks at 95-165 Ma, 200-250 Ma, and 750-850 Ma. Then U-Pb dating of zircons from the terminal Miocene Shangfuchi Sandstone and Kuantaoshan Sandstone shows similar age spectra with peaks of 90-190 Ma and 200-250 Ma, which suggest that sediment supply should have changed since the terminal Miocene. According to the correlation with detrital zircon age spectra of possible sources, sediment supply of Miocene formations with abundant Proterozoic zircons should have come from the Cathaysia basement. On the contary, for that of the terminal Miocene formations, the sources would have dominantly derived from Yanshanian and granitic plutons in East Cathaysia. The results of this study suggest that the Shangfuchi Sandstone and Kuantaoshan Sandstone should have been deposited in the initial arc-continent collision between Luzon Arc and Eurasian passive continental margin. The arc-continental collision might have induced a sudden increase of the depositional slope which may have led of the noticeable change of sediment source in the terminal Miocene.
Hsu, Chun-Chieh, and 許鈞傑. "Detrital Zircon U-Pb and Hf Isotopic Study in Northwestern Sumatra, Indonesia." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/25561429169923275462.
Повний текст джерела國立臺灣大學
地質科學研究所
104
In NW Sumatra, Tertiary sedimentary basins that occur in forearc and backarc settings with respect to the present-day subduction system were deposited in three major terranes, namely, the Woyla Nappe, the East Sumatra block, and the West Sumatra block. NW Sumatra represents the product of complex accretion/collision/subduction histories among these three terranes, which have originated from the eastern margin of Gondwanaland. To better understand the complex histories, we present a detrital zircon study in NW Sumatra that, together with our unpublished work on major magmatic rocks in the area, allow us to reach the following conclusions: (1) Detrital zircons from 14 samples (river sand or sandstone) in the forearc basin reveal seven age peaks at ~1050 Ma (n=74), ~550 Ma (n=65), ~214 Ma (n=138), ~131 Ma (n=14), ~100 Ma (n=65), ~52 Ma (n=238) and 17-0 Ma (n=303), respectively; (2) Detrital zircons from nine samples in the backarc basin show similar age populations; (3) The Late Triassic zircons, with εHf(T) values of -18 to 0, are sourced mainly from the Indosinian granitoids that are widespread in the East Sumatra block; (4) The less abundant Early Cretaceous zircons, with εHf(T) values of -5 to 0, are most likely from the West Sumatra block; (5) The Late Cretaceous zircons, with εHf(T) values of +11 to +16, are from the Woyla Nappe due probably to the Woyla accretion; (6) The Eocene and younger zircons, with εHf(T) values of +6 to +17, are from the initial stage and modern arc magmatic rocks related to the Indian Ocean plate subduction.
Zul, Zugeerbai, and 李瑞清. "Detrital Zircon U-Pb Age Study of the Paleozoic-Mesozoic Sedimentary Rocks, Southwestern Fujian." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/16271485870090207846.
Повний текст джерела國立臺灣大學
地質科學研究所
99
Abstract The study is in located in the Southwest of Fujian Province, sandstone samples were collected from the Cambrian to Ordovician metamorphic rocks, and the Devonian to Jurassic sedimentary rocks. Detrital zircons of the Paleozoic-Mesozoic strata rocks were separated from10 samples by LA-ICP-MS measurements for U-Pb dating. The Southern China region undergo several plate collision, results in many phase tectonic activities, causing the variabilities of sequence stratigraphy, tectonic, and sedimentary environment. Result from the U-Pb dating, it indicates that the Jinning orogeny, Caledonian orogeny, Indosinian and Yanshanian magmatic detrital zircons re-accumulation of geological sigifcance. The comparison of these tectonic movements Caledonian, Indosinian and Yanshanian seems to slightly change of detrital zircon ages. The detrital zircon age assemblidge of Caledonian indicates that >2400 Ma (Wutai movement), 1700-1000 Ma, 1000-930 Ma (Sibao movement) higher proportion of about 95%. Some of igneous zircons deposite in the time without tectonic movement (1700-1000Ma). This study suggests that there remain sporadic igneous activity, such as the 750-450 Ma can be found in Fujian province during the sporadic distribution of igneous rocks. From the Caledonian movement and after, because nearly 40% from this period of igneous detrital zircons , with the result >750 Ma detrital zircons significantly reduced the proportion of the total, but this period is >2400 Ma and 850-750Ma for proportion of detrital zircon and more. The reason is Caledonian movement may cause the early Paleozoic, and Sinian strata exposed, resulting in 750-450 Ma and 850-750 Ma a higher proportion of the old in >2400 Ma detrital zircons more reasons, this study still can’t explain. Indosinian movement period, >750 Ma detrial zircon tended to decrease, probably a lot of volcanic rocks covering the surface gradually caused. But Indosinian movement 1900-1700 Ma (Luliang movement) the proportion of detrital zircons have a very high proportion of about 18%; Luliang movement is the main formation period the Catashyia, constitute the main base Catashyia, now exposed in Fujian northwest region, knows as Mayuan group. During the Indosinian movement, South China region the formation of large areas fault and folding result in a large basement area Cathaysia exposed surface, and become the main source.
Lin, Hong-Chih, and 林虹志. "Detrital zircon U-Pb dating of the Tananao Schist in the Nanao region, eastern Taiwan." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/86627721517341739464.
Повний текст джерела國立臺灣大學
地質科學研究所
104
The Tananao Schist exposed from Dongao to Nanao region is located in the northern part of the eastern limb of Central Range. The lithological characters include quartz-mica schist, metachert, black schist, thin layer of marble, green schist, amphibolite, and gneiss. The Tananao Schist experienced the Nanao Orogeny and Penglai Orogenies. It is difficult to identify the relationships between various schists due to the above-mentioned two orogenies buy reginal metamorphism. In addition, previous studies provided insufficient information of fossil records and dating in the Tananao schist; therefore, it is very difficult to diseriminal the stratigraphic sequerence of these schists. Accordingly, zircon U-Pb dating was used to analyze the quartz-mic schist, green schist, metachert, and gnesiss in this study and determine the stratigraphic age. This study can help us to unravel the tectonic environment of the Tananao schist in Dongao and Nanao region. We analyzed 24 samples and obtain the results of the detrital zircons U-Pb youngest age. In assumption, we could discover the youngest age of detrital zircon of the sedimentary rock in oringal, as if we could find simultaneously igneous rocks that eroded and replaced in the same age. The schists from Dongao Schist, Nanaoling Schist, and Wuta Schist all have some common features such as the sedimentary rocks from the late Cretaceous as well as some other aged. The youngest depositional age is 75±2 Ma among various layer ages. The age may be presented a tectonic mélange in origen. During the late Mesozoic, the Paleo-Pacific Plate subducted beneth to the Cathaysia Bolck. The Paleo-Pacific oceanic plate has been squeezed and ruptured, withing the subduction zone, all different layers from different ages then have been mixed together such as amphibolite, marble, metamorphic rock, meta-volcaniclastic rock, quartz-mica schist, and green schist. Hence, it is suggested that the schists was situated in a tectonic mélange until 75 Ma at least.