Relevant bibliographies by topics / Late Precambrian

Academic literature on the topic 'Late Precambrian'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Late Precambrian"

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Zhang, Y. "Interpreting Late Precambrian Microfossils." Science 282, no. 5395 (December 4, 1998): 1783a—1783. http://dx.doi.org/10.1126/science.282.5395.1783a.

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Ivantsov, A. Yu, and M. A. Zakrevskaya. "Symmetry of Vendobionta (Late Precambrian Metazoa)." Paleontological Journal 55, no. 7 (December 2021): 717–26. http://dx.doi.org/10.1134/s0031030121070054.

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Odin, G. S., N. H. Gale, and F. Doré. "Radiometric dating of Late Precambrian times." Geological Society, London, Memoirs 10, no. 1 (1985): 65–72. http://dx.doi.org/10.1144/gsl.mem.1985.010.01.07.

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Valentine, J. W. "Late Precambrian bilaterians: grades and clades." Proceedings of the National Academy of Sciences 91, no. 15 (July 19, 1994): 6751–57. http://dx.doi.org/10.1073/pnas.91.15.6751.

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Thorpe, R. S. "Geochemistry and eruptive environment of metavolcanic rocks from the Mona Complex of Anglesey, North Wales, U.K." Geological Magazine 130, no. 1 (January 1993): 85–91. http://dx.doi.org/10.1017/s0016756800023748.

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AbstractThe late Precambrian–early Palaeozoic Monian Supergroup of the Mona Complex is a thick sequence of flysch-type sediments and metavolcanic rocks which were deposited during the late Precambrian–early Palaeozoic and deformed during the late Precambrian and Caledonian (Ordovician/Silurian) orogenies. The Monian Supergroup includes tectonically emplaced, geographically separated outcrops of metabasalt/andesite, gabbro and serpentinized ultramafic rocks all of ophiolite affinity. The major units of the Mona Complex are separated by important faults/fault zones which may represent terrane boundaries. New chemical analyses, together with existing ones, show that the metabasalts and meta-andesites from the older New Harbour Group of north Anglesey have characteristics of suprasubduction zone arc eruptives whereas the metabasalts from the younger Gwna Group of south Anglesey and Lleyn have MORB geochemistry. It is suggested that these volcanic rocks were produced during the late Precambrian–early Palaeozoic development of the lapetus Ocean and emplaced as separate terranes during its closure.
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Al-Malabeh, Ahmad, Hasan Al-Fugha, and Tayel El Hasan. "Petrology and geochemistry of Late Precambrian magmatic rocks from southern Jordan." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 233, no. 3 (September 1, 2004): 333–50. http://dx.doi.org/10.1127/njgpa/233/2004/333.

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Cowie, J. W., and M. R. W. Johnson. "Late Precambrian and Cambrian geological time-scale." Geological Society, London, Memoirs 10, no. 1 (1985): 47–64. http://dx.doi.org/10.1144/gsl.mem.1985.010.01.06.

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Knauth, L. Paul, and Martin J. Kennedy. "The late Precambrian greening of the Earth." Nature 460, no. 7256 (July 8, 2009): 728–32. http://dx.doi.org/10.1038/nature08213.

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Morris, S. C. "Late Precambrian and Cambrian Soft-Bodied Faunas." Annual Review of Earth and Planetary Sciences 18, no. 1 (May 1990): 101–22. http://dx.doi.org/10.1146/annurev.ea.18.050190.000533.

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Bengtson, S., and Y. Zhao. "Predatorial Borings in Late Precambrian Mineralized Exoskeletons." Science 257, no. 5068 (July 17, 1992): 367–69. http://dx.doi.org/10.1126/science.257.5068.367.

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Dissertations / Theses on the topic "Late Precambrian"

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Cardenas, S. Fidel A. "The geochemistry of a late Precambrian weathering profile, northwest Scotland." Thesis, University of Strathclyde, 1986. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21485.

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In an attempt to understand the environment of the Precambrian weathering at Rispond, and compare it with weathering processes taking place at the present time, samples weathered to different degrees have been taken at various distances immediately below the Cambrian Unconformity. These samples have been subjected to chemical analysis by X-ray fluorescence spectometry and wet analysis, and to mineralogical analysis by X-ray diffraction and polarised light microscopy. Interpretation of these results indicate that the samples represent a weathering profile (although not necessarily an unchanged one as these rocks have been subjected to a maximum temperature of 250°C during burial subsequent to the deposition of the Cambrian strata). This is inferred from the minerals present in the soil, the nature of the chemical changes observed, the similarities of the data on the Kronberg weathering diagram to those of present-day weathering, and the position of the profile immediately below the unconformity. Further interpretation of the results in terms of the thermodynamic properties of the minerals present in the profile, the chemical reactions believed to have taken place, the geological evidence and a survey of the chemical composition of present-day surface waters leads to the conclusion that the rocks below the Cambrian Unconformity at Rispond represent a fossil soil profile. These rocks contain pyrophyllite, considered to have been formed by low-grade metamorphism rather than by weathering. Three possible modes of origin have been considered, and that involving the weathering of potassium feldspar to kaolinite alone in an acid environment rejected. The two mechanisms involving the weathering of the feldspar to illite in an arid alkaline environment with restricted drainage are considered to be more likely. The illite produced in these mechanisms was further weathered to produce, in the one case, kaolinite, and in the other one, potassium beidellite as a mixed layer mineral with illite. These two mechanisms can be mixed in any proportion, the exact amount of potasium beidellite present depending upon the relative thermodynamic stabilities of kaolinite and beidellite. As the latter is unknown, further accuracy cannot be achieved at present. The presence of abundant potassium feldspar in the Fucoid Beds, and the existence of trace fossil planolites in such rocks as well as the temperature to which they have been heated (about 250°C) suggested the possible existence of an ammonium feldspar in the area. Therefore, a method to measure the amount of ammonia content in these rocks has been designed. The results of twenty-two samples from the Cambro-Ordovician succession of N.W. Scotland analysed by this method show that the ammonia content is very low. If all the ammonia is present as an ammonium feldspar (buddingtonite), it represents about 0.3% of the mineral in the shales and even less in other rock types.
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Sun, Weiguo. "Contributions to palaeontology and stratigraphic correlation of the late precambrian in China and Australia /." Title page, contents and summary only, 1985. http://web4.library.adelaide.edu.au/theses/09PH/09phs957.pdf.

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Al, Rajaibi Ibrahim Mohamed amur. "Origin and variability of the late Precambrian-Cambrian Athel Silicilyte, South Oman Salt Basin." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/origin-and-variability-of-the-late-precambriancambrian-athel-silicilyte-south-oman-salt-basin(4117c367-a1fa-4937-877e-d1391f95c406).html.

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The Precambrian-Cambrian Athel Silicilyte is an enigmatic chert unit of up to 390 m thick found as slabs (each slab typically 2 × 6 km across) entrapped within salt domes at a depth of 4-5 km in the South Oman Salt Basin. This formation is a prolific self-charged reservoir with high porosity (up to 34 %) and high oil saturation (80 %). Despite its economic value, the origin and the variability of this formation are not fully understood. This study therefore aims to investigate the variability and the origin (silica source and precipitation mechanism) of the Athel Silicilyte. Data obtained from core, wireline log and petrographical analysis were employed to establish the vertical and the lateral variability and, with the assistance of geochemical data, the likely source and precipitation mechanism of silica was determined.The Athel Silicilyte is only present in the deepest parts of the South Oman Salt Basin within the fault-bounded Athel Basin, bounded by two silt-rich mudstone units. Six lithofacies were recognised in the Athel Silicilyte that reflect variability in detrital material contents (three silica-rich facies), sediment remobilisation (slumped and brecciated lithofacies) and diagenetic modification (carbonate-bearing lithofacies), with the silica-rich facies being the most abundant (> 97 % of the total thickness). The Athel Silicilyte exhibits wavy discontinuous lamination and it is predominately (silica-rich facies average = 80 wt. %) composed of connected-networks of microcrystalline quartz (1-5 µm). Other constituent components are detrital quartz (3 wt. %), illite (10 wt. %), pyrite (4 wt. %) and organic carbon (TOC = 3 wt. %). The detrital contents increase towards the Upper Athel Silicilyte and towards the basin margins (ranging from 3 to 30 wt. %). The wavy laminations are interpreted to have a microbial origin. The homogeneity, loose packing of detrital grains and preservation of 390 m thick laminated fabric suggest that the Athel Silicilyte precipitated syndepositionally in microbial layers during low detrital input. The intense detrital input during bounding mudstones sedimentation inhibited Athel Silicilyte precipitation as a result of the rapid burial of microbial layers. The Athel Silicilyte shows strong enrichments of redox-sensitive elements (U, V and Mo), Mn-depletion, positive Ce anomalies, and small framboidal pyrites (3.6-4.0 µm), suggesting that the water column was euxinic during precipitation.Based on the petrographical evidence for the Athel Silicilyte forming as a syndepositional precipitate alongside seawater-like rare earth element (REE) characteristics, silica is interpreted to have been sourced directly from seawater. Mass balance calculations support this interpretation, indicating that silica-rich Precambrian seawater provided the significant silica mass in the Athel Silicilyte. The ability of dissolved silica to form hydrogen bonds with the functional groups (e.g. carboxyl and hydroxyl) in microbial layers was the key for Athel Silicilyte precipitation. The formation of hydrogen bonds was made possible under euxinic conditions, where the pH values were probably lower (< 7) than for the normal seawater as a result of HS- and H+ production by sulphate reducing bacteria and HS- oxidation at the redox boundary by sulphur oxidising bacteria. Consequently, dissolved silica was concentrated in microbial layer microenvironemnts, resulting in silica nucleation and polymerisation.
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Horak, Jana M. "The late Precambrian Coedana and Sarn complexes, Northwest Wales : a geochemical and petrochemical study." Thesis, Cardiff University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580636.

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Wang, Ping. "Geology and Tectonic Significance of the Late Precambrian Eastern Blue Ridge Cover Sequence in Central Virginia." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-06062008-142355/.

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Tribe, Ian Roger. "Deformation of granitoid rocks, Channel Islands, UK : Implications for the structural evolution of a late Precambrian arc." Thesis, Oxford Brookes University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262069.

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Herrington, Paul M. "Stratography, sedimentology and diagenesis of late Precambrian carbonates from the Upper Limestone-Dolomite 'series', central east Greenland." Thesis, University of Birmingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.694379.

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Killick, M. F. "Sedimentological and geochemical studies on late Precambrian sequences of the Eastern block of the Massif Ancien, High Atlas, Morocco." Thesis, University of Reading, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383479.

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Restrepo, Pedro Alonso. "Late Precambrian to Early Mesozoic tectonic evolution of the Colombian Andes, based on new geochronological geochemical and isotopic data." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187450.

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⁴⁰Ar/³⁹Ar and U/Pb geochronology of the basement rocks in the Colombian Andes confirm the presence of the Grenvillian age high metamorphic grade belt . The Grenvillian, or locally known as Nickerie-Orinoquiense orogenic belt, is exposed within basements uplifts along the Eastern Cordillera of Colombia and the Sierra Nevada of Santa Marta in the Caribbean coast. Rare Earth element geochemistry and petrology indicate that the Nickerie-Orinoquiense basement rock's protoliths are dominantly of continental affinity, now consisting mainly of metapsammites, metavolcanics and metaplutonic rocks metamorphosed to granulite facies PT conditions. Nd crustal residence ages and U/Pb zircon data indicate variable involvement of 'older' Late Archean - Early Proterozoic components and 'younger' ~ 1.1 Ga additions, which were tectonically mixed during the Nickerie-Orinoquian collisional metamorphic episode. Low metamorphic grade rocks that overlie the Nickerie-Orinoquian basement are exposed along the Eastern Cordillera of Colombia at the Quetame-Floresta-Santander massifs, Périja Range and Merida Andes. A U/Pb zircon age obtained from a synkinematic pluton structurally concordant with the low metamorphic grade belt from the Santander Massif, yielded a 477 ± 16 Ma, indicating a Mid-Ordovician regional greenschist to amphibolite facies metamorphic event for these rocks. The latter is referred-to as the 'Caparonensis Orogeny' in the Venezuelan Andes. Rare Earth Element geochemistry and petrologic data indicate that the low metamorphic grade belt consists of a thick supracrustal sequence i.e. metapelitic-metapsammitic sequence with minor crosscutting mafic dikes. Additional trace element discrimination plots indicate that the Caparonensis synkinematic plutons are of continental arc affinity. ⁴⁰Ar/ ³⁹Ar geochronology, petrology and field observations in Santander Massif, indicate a widespread regional metamorphic overprint took place in Late Triassic-Early Jurassic time. This event was the result of a thermal welt associated with back-arc extension and concomitant intrusion of a high volume of calk-alkalic plutons. Deposition of a thick molassic sequence (2000-4000 m) followed, flanking the uplifted region. The lower Paleozoic metamorphic rocks were elevated from greenschist to sillimanite (locally kyanite) PT metamorphic conditions and the Mid-Upper Paleozoic sedimentary cover was locally metamorphosed from greenschist to lower PT metamorphic conditions, as a function of relative distance to the plutonic centers at time of metamorphism.
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Larkin, Emma A. "FIELD, GEOCHRONOLOGIC, AND GEOCHEMICAL CONSTRAINTS ON LATE PRECAMBRIAN TO EARLY PALEOZOIC TERRANE ACCRETION IN THE SOUTHERN APPALACHIAN BLUE RIDGE PROVINCE." UKnowledge, 2016. http://uknowledge.uky.edu/ees_etds/39.

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Xenolith-bearing orthogneiss of Amazonian affinity discovered in the Dellwood quadrangle in the Blue Ridge basement complex represents the oldest crustal component of the southern Appalachians (1.33 – 1.37 Ga: Quinn, 2012). New U-Pb zircon ages for migmatitic paragneiss of the Cartoogechaye terrane exposed in the Dellwood quadrangle reveal two unique detrital zircon age signatures that indicate either a local eastern Laurentian margin source or an exotic source. Detailed mapping, whole rock geochemistry, and U-Pb zircon geochronology were conducted to determine whether this exotic crustal component extends farther south into the Hazelwood 7.5” quadrangle. Lithological similarities exist between paragneisses in the Dellwood quadrangle and those in the Hazelwood quadrangle. However, the increase in proportion of leucosome and polyphase folding prevent direct correlation of lithologies between the areas. Whole rock major element compositions overlap the composition of basement orthogneisses. Zircon ages of six paragneiss samples reveal multiple detrital zircon age modes that are dominated by two Grenville modes at ~1050 and 1150 Ma. Minor zircon populations exist at ~450 – 480, 700 – 900, and 1300 – 1500 Ma. Age distributions and compositional trends are evidence that the protolith of the paragneiss in the Hazelwood quadrangle was Neoproterozoic rift sediments with a dominant Laurentian margin source.
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Books on the topic "Late Precambrian"

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Hambrey, M. J. Late Precambrian glaciation of central East Greenland. Copenhagen: Nyt Nordisk Forlag, 1987.

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Hegenberger, W. Stratigraphy and sedimentology of the late Precambrian Witvlei and Nama groups, east of Windhoek. Windhoek, Namibia: Geological Survey of Namibia, Ministry of Mines and Energy, 1993.

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Canada, Geological Survey of. Geology of the Late Precambrian Fury and Hecla Group, Northwest Baffin Island, District of Franklin. S.l: s.n, 1986.

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W, Chandler F. Geology of the Late Precambrian Fury and Hecla Group, northwest Baffin Island, District of Franklin. Ottawa, Canada: Energy, Mines and Resources Canada, 1988.

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Herrington, Paul M. Stratography, sedimentology and diagenesis of late Precambrian carbonates from the Upper Limestone-Dolomite 'series', central east Greenland. Birmingham: University of Birmingham, 1989.

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E, White Chris, Macdonald Alan S, and Geological Survey of Canada, eds. Stratigraphy, tectonic setting, and geological history of late Precambrian volcanic-sedimentary-plutonic belts in southeastern Cape Breton Island, Nova Scotia. Ottawa, Ont: Geological Survey of Canada, 1996.

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Weissbrod, Tuvia. Sedimentology and paleogeography of the Late Precambrian-Early Cambrian arkosic and conglomeratic facies in the northern margins of the Arabo-Nubian Shield. Jerusalem: Geological Survey of Israel, 2002.

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Kresz, D. U. Precambrian geology, Seagram Lake area. Toronto, Ont: Ontario Geological Survey, 1992.

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Smith, P. M. Precambrian geology, Vista Lake area. Toronto, Ont: Ontario Geological Survey, 1991.

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Smith, P. M. Precambrian geology: Vista Lake area. Toronto: Ontario Ministry of Northern Development and Mines, 1993.

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Book chapters on the topic "Late Precambrian"

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Xu, Bei. "Late Archean: Mesoproterozoic Geology of the Tarim Craton." In Precambrian Geology of China, 305–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47885-1_8.

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Xueguang, Huang. "Mid-Late Proterozoic (Pre-Sinian) Crust." In Precambrian Crustal Evolution of China, 161–262. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-662-03697-6_4.

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Peng, Peng. "Late Paleoproterozoic–Neoproterozoic (1800–541 Ma) Mafic Dyke Swarms and Rifts in North China." In Precambrian Geology of China, 171–204. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47885-1_4.

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Rast, Nicholas. "Late Precambrian tectonism — the opening of the Iapetus Ocean." In Proceedings of the International Conferences on Basement Tectonics, 395–406. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1614-5_27.

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von Raumer, J. F., and F. Neubauer. "Late Precambrian and Palaeozoic Evolution of the Alpine Basement — An Overview." In Pre-Mesozoic Geology in the Alps, 625–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84640-3_37.

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Reynolds, David. "Deformation along the Late Precambrian Streeruwitz thrust near Allamoore, Hudspeth County, Texas." In Structure and Stratigraphy of Trans-Pecos Texas: El Paso to Guadalupe Mountains and Big Bend July 20–29, 1989, 85–96. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft317p0085.

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Qian, Xianglin. "Evolution and Tectonic Environment of the Late Precambrian Aulacogen System of the North China Craton." In Basement Tectonics 10, 425. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-017-0831-9_43.

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Simpson, Carol, and Theresa Kalaghan. "Day six - Deformation of Late Precambrian plutonic rocks in the Blue Ridge Province, SW Virginia." In Geometry and Deformation Fabrics in the Central and Southern Appalachian Valley and Ridge and Blue Ridge: Frederick, Maryland to Allatoona Dam, Georgia July 20–27, 1989, 49–56. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft357p0049.

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Omori, M. "On the Initiation of the Hard Tissues of Animals during the Late Precambrian to the Early Cambrian." In Mechanisms and Phylogeny of Mineralization in Biological Systems, 335–42. Tokyo: Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68132-8_54.

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Hawley, B. W., and S. P. Gay. "Late Precambrian Strike-Slip Fault System of the Wichita-Amarillo Mountains as Delineated by Detailed Aeromagnetic Data." In Proceedings of the International Conferences on Basement Tectonics, 251. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5098-9_27.

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Conference papers on the topic "Late Precambrian"

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Wolfe, Paul J., B. H. Richard, Douglas L. Shrake, Paul E. Potter, and Gary Sitler. "Late precambrian structure in Southwestern Ohio." In SEG Technical Program Expanded Abstracts 1989. Society of Exploration Geophysicists, 1989. http://dx.doi.org/10.1190/1.1889537.

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England, R., and J. Soper. "Mesozoic Basin Development on the North Atlantic Margins - its Relationship to Late-Precambrian Rifting." In 57th EAEG Meeting. Netherlands: EAGE Publications BV, 1995. http://dx.doi.org/10.3997/2214-4609.201409586.

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Volkova, Galina B. "Evolution of the morphology of ancient cyanobacteria and its significance for biostratigraphical compositions in the late Precambrian." In Instruments, Methods, and Missions for Astrobiology V, edited by Richard B. Hoover, Alexei Y. Rozanov, and Jere H. Lipps. SPIE, 2003. http://dx.doi.org/10.1117/12.486703.

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Tikoff, Basil, Paul R. Kelso, Annia K. Fayon, Richard Gaschnig, and Jeffrey D. Vervoort. "RECONSTRUCTING THE WESTERN MARGIN OF PRECAMBRIAN LAURENTIA IN THE PACIFIC NORTHWEST: REMOVING THE EFFECTS OF LATE CRETACEOUS-PALEOGENE ROTATION." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357044.

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Schultz, Sarah K., James A. MacEachern, and H. Daniel Gibson. "REACTIVATION OF PRECAMBRIAN BASEMENT STRUCTURES AND ITS EFFECTS ON THE REGIONAL STRATIGRAPHY OF THE EARLY CRETACEOUS (LATE ALBIAN) VIKING FORMATION, CENTRAL ALBERTA, CANADA." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-300715.

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Walsh, Kevin, Emma A. Larkin, and David P. Moecher. "GEOCHRONOLOGICAL, GEOCHEMICAL, AND PETROLOGICAL CONSTRAINTS ON THE ORIGIN OF THE CARTOOGECHAYE TERRANE, CLYDE-DELLWOOD AREA, WESTERN NORTH CAROLINA: IMPLICATIONS FOR THE LATE PRECAMBRIAN TO EARLY PALEOZOIC EVOLUTION OF THE EASTERN LAURENTIAN MARGIN." In 66th Annual GSA Southeastern Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017se-289819.

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Zhao, Zuoan, and Dali Wang. "MACHINE LEARNING FOR PRODUCTIVITY PREDICTION IN HETEROGENEOUS CARBONATE GAS RESERVOIRS, CENTRAL SICHUAN BASIN, CHINA." In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0090.

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An approach of machine learning was used to evaluate and predict the production of the heterogeneous carbonate gas reservoirs in the horizontal development wells of the late Precambrian Dengying Formation. The present data set of machine learning consists of gamma ray log, laterolog, high-resolution electrical image logs, and production rate data. The previous data set acquired the conventional openhole logs, including gamma ray log, neutron-density log, sonic log, laterolog, and dipole acoustic log. The challenge in the previous data set was that the training process for machine learning was not convergent. It was most likely that the conventional log responses did not fully correspond to the productivity of the heterogenous carbonate gas reservoirs. Forty-one wells associated with the present data set were used to set up the training sample data set for the machine learning to the productivity prediction of the carbonate gas reservoirs. The data set construction includes log depth shift, calibrated image log creation, classification of reservoir types from core and carbonate reservoir heterogeneity variables extraction from image logs. Core observation and core laboratory analysis indicate that the pore space of the carbonate gas reservoirs mainly consists of vugs, caves, and fractures. However, the vugs and caves are selectively developed and randomly distributed both laterally and vertically. This represents a complex heterogeneous carbonate reservoir in which the vugs and caves are key contributor to the total pore space of the carbonate gas reservoir. The attributes of the vugs and caves can be extracted from the electrical image logs, including connectedness, surface proportion, size, and thickness of vug, and cave zones. Six horizontal development wells were used to validate the machine learning approach. The predicted gas production rates in the four wells separately were 700,000 m3/d, 2,000,000 m3/d, 800,000 m3/d, 300,000 m3/d, 1,100,000 m3/d and 1,180,000 m3/d, and the respective actual gas production rates are 1,019,790 m3/d, 1,820,000 m3/d, 800,000 m3/d, 396,000 m3/d , 1,700,000 m3/d, and 1,411,900 m3/d. The machine learning workflow and approach provided satisfactory results in the six horizontal wells. Subsequently, the electrical image logs have run in the standard logging program in the more than 50 horizontal development wells.
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Madi, Jamal A., and Elhadi M. Belhadj. "Unconventional Shale Play in Oman: Preliminary Assessment of the Shale Oil / Shale Gas Potential of the Silurian Hot Shale of the Southern Rub al-Khali Basin." In SPE Middle East Unconventional Resources Conference and Exhibition. SPE, 2015. http://dx.doi.org/10.2118/spe-172966-ms.

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Abstract Oman's petroleum systems are related to four known source rocks: the Precambrian-Lower Cambrian Huqf, the Lower Silurian Sahmah, the Late Jurassic Shuaiba-Tuwaiq and the Cretaceous Natih. The Huqf and the Natih have sourced almost all the discovered fields in the country. This study examines the shale-gas and shale-oil potential of the Lower Silurian Sahmah in the Omani side of the Rub al Khali basin along the Saudi border. The prospective area exceeds 12,000 square miles (31,300 km2). The Silurian hot shale at the base of the Sahmah shale is equivalent to the known world-class source rock, widespread throughout North Africa (Tannezouft) and the Arabian Peninsula (Sahmah/Qusaiba). Both thickness and thermal maturities increase northward toward Saudi Arabia, with an apparent depocentre extending southward into Oman Block 36 where the hot shale is up to 55 m thick and reached 1.4% vitrinite reflectance (in Burkanah-1 and ATA-1 wells). The present-day measured TOC and estimated from log signatures range from 0.8 to 9%. 1D thermal modeling and burial history of the Sahmah source rock in some wells indicate that, depending on the used kinetics, hydrocarbon generation/expulsion began from the Early Jurassic (ca 160 M.a.b.p) to Cretaceous. Shale oil/gas resource density estimates, particularly in countries and plays outside North America remain highly uncertain, due to the lack of geochemical data, the lack of history of shale oil/gas production, and the valuation method undertaken. Based on available geological and geochemical data, we applied both Jarvie (2007) and Talukdar (2010) methods for the resource estimation of: (1) the amount of hydrocarbon generated and expelled into conventional reservoirs and (2) the amount of hydrocarbon retained within the Silurian hot shale. Preliminary results show that the hydrocarbon potential is distributed equally between wet natural gas and oil within an area of 11,000 square mile. The Silurian Sahmah shale has generated and expelled (and/or partly lost) about 116.8 billion of oil and 275.6 TCF of gas. Likewise, our estimates indicate that 56 billion of oil and 273.4 TCF of gas are potentially retained within the Sahmah source rock, making this interval a future unconventional resource play. The average calculated retained oil and gas yields are estimated to be 6 MMbbl/mi2 (or 117 bbl oil/ac-ft) and 25.3 bcf/mi2 (or 403 mcf gas/ac-ft) respectively. To better compare our estimates with Advanced Resources International (EIA/ARI) studies on several Silurian shale plays, we also carried out estimates based on the volumetric method. The total oil in-place is 50.2 billion barrels, while the total gas in-place is 107.6 TCF. The average oil and gas yield is respectively 7 MMbbl/mi2 and 15.5 bcf/mi2. Our findings, in term of oil and gas concentration, are in line or often smaller than all the shale oil/gas plays assessed by EIA/ARI and others.
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Hui, Gang, Fei Gu, and Zhangxin Chen. "An Integrated Method to Mitigate Hazards from Hydraulic Fracturing-Induced Earthquakes in the Duvernay Shale Play." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210287-ms.

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Abstract In recent decades, a remarkable increase in induced seismicity in the Western Canada Sedimentary Basin (WCSB) has been largely attributed to the hydraulic fracturing (HF) operations in unconventional plays. However, a mitigation strategy concerning geological, geomechanical, and operational susceptibilities to HF-induced seismicity has not been well understood. In this work, an integrated method is proposed to mitigate potential risks from HF-induced seismicity in the Duvernay play near Crooked Lake. The geological susceptibility to induced seismicity is evaluated first from site-specific formation pressure, a distance to the Precambrian Basement, and the existence of pre-existing faults. The regional in-situ stress and rock mechanics are then assessed to determine the geomechanical susceptibility to induced seismicity. Next, the operational susceptibility is determined by comparing induced seismicity with operational parameters such as total injection fluids and proppant mass. Finally, a multiple linear regression (MLR)-based approach is proposed by considering the feature importance of different parameters. It is found that regions with a low formation pressure (&lt;60MPa), a great distance to the Precambrian Basement (&gt;260m), a low minimum principal stress (&lt;70MPa), and a low brittleness index (&lt;0.62) tend to be seismicity-quiescent regions. Three new horizontal wells are drilled and fractured to validate the applicability of our MLR-based approach. High-resolution monitoring results indicated that 95% of the induced events had a magnitude of less than 2.0 during and after HF operations (three-month time window and five-kilometer well-event distance), among which the maximum magnitude reached M3.05 (&lt;red light magnitude M4.0). Therefore, the MLR-based approach was successful in mitigating potential seismicity risks, which can be applied to other regions to guide seismicity-free fracturing operations in unconventional plays.
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Francisco, Reagan N., Daniel Lao-Davila, Estella A. Atekwana, Mohamed G. Abdelsalam, Amy R. Pritt, Wesley T. Prater, Jalf Salima, et al. "ORIENTATION OF PRECAMBRIAN STRUCTURES AND THE FORMATION OF BORDER FAULTS IN THE LAKE MALOMBE AREA, SOUTHERN MALAWI RIFT." In 51st Annual GSA South-Central Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017sc-289530.

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Reports on the topic "Late Precambrian"

1

Currie, K. L. Revised Late Precambrian Stratigraphy near Saint John, New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/126556.

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2

Pickerill, R. K., and L. R. Fyffe. Revised Late Precambrian Stratigraphy near Saint John, New Brunswick: Discussion. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132600.

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Currie, K. L. Revised Late Precambrian Stratigraphy near Saint John, New Brunswick: Reply. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132601.

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4

Barr, S. M., and C. E. White. Late Precambrian - Early Cambrian Geology, Saint John - St. Martins area, southern New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/131847.

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5

Currie, K. L. Late Precambrian Igneous Activity and Its Tectonic Implications, Musquash - Loch Alva Region, southern New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122529.

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6

Chandler, F. W. Geology of the late Precambrian Fury and Hecla Group, northwest Baffin Island, District of Franklin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/126938.

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7

Park, J. K. Paleomagnetism of units P1-P3 of the late Precambrian Shaler Group, Brock Inlier, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/132847.

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8

Barr, S. M., C. E. White, and A. S. Macdonald. Stratigraphy, tectonic setting, and geological history of late Precambrian volcanic-sedimentary-plutonic belts in southeastern Cape Breton Island, Nova Scotia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/208235.

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9

McDannell, K. T., N. Pinet, and D. R. Issler. Exhuming the Canadian Shield: preliminary interpretations from low-temperature thermochronology and significance for the sedimentary succession of the Hudson Bay Basin. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/326100.

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The geological history of the Canadian Shield is difficult to constrain because the sedimentary record is missing in those areas where Precambrian basement is exposed at the surface. This study presents preliminary results and interpretations of new apatite fission-track (AFT) analyses to elucidate the low-temperature (&amp;lt;120°C) history across Canada. The AFT modelling of samples from Southampton Island, in Nunavut, indicates that maximum temperatures varied between 62°C and 93°C during the Phanerozoic. Maximum burial occurred in the Devonian, but a second phase of Mesozoic burial is proposed, especially in the case for the sample recovered closest to the northern island-bounding normal faults. The AFT modelling of a sample from northern Ontario indicates that a maximum burial temperature of approximately 75°C was reached during the Late Devonian. Overall, these results demonstrate that the Hudson Bay sedimentary succession is the remnant of a more extensive and thicker sedimentary cover than is preserved. This study also provides the opportunity to discuss innovative methodology and modelling approaches for low-temperature thermochronology.
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10

Weber, W. Precambrian geology of the Lake Winnipeg area. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207505.

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