Academic literature on the topic 'Proterozoic crustal growth'
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Journal articles on the topic "Proterozoic crustal growth"
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McCulloch, M. T., L. P. Black, and R. W. Page. "Proterozoic crustal growth: Underplating and magmatism." Chemical Geology 70, no. 1-2 (August 1988): 71. http://dx.doi.org/10.1016/0009-2541(88)90396-8.
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Hall, Jeremy, Keith E. Louden, Thomas Funck, and Sharon Deemer. "Geophysical characteristics of the continental crust along the Lithoprobe Eastern Canadian Shield Onshore–Offshore Transect (ECSOOT): a review." Canadian Journal of Earth Sciences 39, no. 5 (May 1, 2002): 569–87. http://dx.doi.org/10.1139/e02-005.
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The Eastern Canadian Shield OnshoreOffshore Transect (ECSOOT) of the Lithoprobe program included 1200 km of normal-incidence seismic profiles and seven wide-angle seismic profiles across Archean and Proterozoic rocks of Labrador, northern Quebec, and the surrounding marine areas. Archean crust is 3344 km thick. P-wave velocity increases downwards from 6.0 to 6.9 km/s. There is moderate crustal reflectivity, but the reflection Moho is unclear. Archean crust that stabilized in the Proterozoic is similar except for greater reflectivity and a well-defined Moho. Proterozoic crust has similar or greater thickness, variable lower crustal velocities, and strong crustal reflectivity. Geodynamic processes of Paleoproterozoic growth of the Canadian Shield are similar to those observed in modern collisional orogens. The suturing of the Archean Core Zone and Superior provinces involved whole-crustal shearing (top to west) in the Core Zone, linked to thin-skinned deformation in the New Quebec Orogen. The Torngat Orogen sutures the Nain Province to the Core Zone and reveals a crustal root, in which Moho descends to 55 km. It formed by transpression and survived because of the lack of postorogenic heating. Accretion of the Makkovik Province to the Nain Province involves delamination at the Moho and distributed strain in the juvenile arcs. Delamination within the lower crust characterizes the accretion of Labradorian crust in the southeastern Grenville Province. Thinning of the crust northwards across the Grenville Front is accentuated by Mesozoic extension that reactivates Proterozoic shear zones. The intrusion of the Mesoproterozoic Nain Plutonic Suite is attributed to a mantle plume ponding at the base of the crust.
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Ross, Gerald M., and David W. Eaton. "Proterozoic tectonic accretion and growth of western Laurentia: results from Lithoprobe studies in northern Alberta." Canadian Journal of Earth Sciences 39, no. 3 (March 1, 2002): 313–29. http://dx.doi.org/10.1139/e01-081.
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The western Canadian Shield of northern Alberta is composed of a series of continental slivers that were accreted to the margin of the Archean Rae hinterland ca. 1.92.0 Ga., preserving a unique record of continental evolution for the interval 2.12.3 Ga. This part of Laurentia owes its preservation to the accretionary style of tectonic assembly south of the Great Slave Lake shear zone, which contrasts with indentationescape processes that dominate the Paleoproterozoic record farther north. The Buffalo Head and Chinchaga domains form the central core of this region, comprising a collage of ca. 23252045 Ma crustal elements formed on an Archean microcontinental edifice, and similar age crust is preserved as basement to the Taltson magmatic zone. The distribution of magmatic ages and inferred collision and subduction zone polarity are used to indicate closure of intervening oceanic basins that led to magmatism and emplacement of continental margin arc and collisional belts that formed from ca. 1998 to1900 Ma. Lithoprobe crustal seismic profiles complement the existing geochronologic and geologic databases for northern Alberta and elucidate the nature of late stages of the accretionary process. Crustal-scale imbrication occurred along shallow eastward-dipping shear zones, resulting in stacking of arc slivers that flanked the western Buffalo Head terrane. The seismic data suggest that strain is concentrated along the margins of these crustal slivers, with sparse evidence for internal penetrative deformation during assembly. Post-collisional mafic magmatism consisted of widespread intrusive sheets, spectacularly imaged as regionally continuous subhorizontal reflections, which are estimated to extend over a region of ca. 120 000 km2. The form of such mid-crustal magmatism, as subhorizontal sheets (versus vertical dykes), is interpreted to represent a style of magma emplacement within a confined block, for which a tectonic free face is unavailable.
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Clowes, R. M., F. A. Cook, A. G. Green, C. E. Keen, J. N. Ludden, J. A. Percival, G. M. Quinlan, and G. F. West. "Lithoprobe: new perspectives on crustal evolution." Canadian Journal of Earth Sciences 29, no. 9 (September 1, 1992): 1813–64. http://dx.doi.org/10.1139/e92-145.
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Lithoprobe is Canada's national, collaborative, multidisciplinary earth science research program directed toward an enhanced understanding of how the North American continent evolved. Research in its eight transects or study areas, which span the country from Vancouver Island to Newfoundland and geological time from 4 Ga to the present, is spearheaded by seismic reflection surveys. These, combined with many other studies, are providing new insight into the varied tectonic processes that have been active in forming the continent. Results from the Southern Cordillera transect show that Mesozoic crustal growth occurred in the central and eastern Cordillera by the accretion and amalgamation of exotic terranes, the collision of which resulted in the generation of crustal-scale antiforms and duplexes. After the principal periods of compression, this area was affected by a major episode of extension that led to the unroofing of the metamorphic core complexes. Farther to the west, past and present subduction processes have eroded the lower lithosphere of accreted terranes and left underplated sediments and oceanic lithosphere. The Lithoprobe East transect, covering the Paleozoic Newfoundland Appalachians and Mesozoic rifted Atlantic margin, reveals three lower crustal blocks, each with distinctive reflection signatures on marine seismic data. Structures of the geologically established tectono-stratigraphic domains, imaged clearly by new onshore reflection data, sole at upper crustal to mid-crustal levels, suggesting that much of the surface stratigraphy is allochthonous to the lower crustal blocks. At the ocean–continent transition, interpretations suggest underplating of thinned continental crust by basaltic melt during the rifting process.In Lake Superior, data from the Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE) transect reveal the complex structures of the late Middle Proterozoic Keweenawan rift, which is up to 35 km deep, that almost split North America. The GLIMPCE data in Lake Huron show a spectacular series of east-dipping crustal-scale reflections that coincide with the Grenville front tectonic zone. These and other data have led to a two-stage model involving collision of an exotic terrane with the southern Superior cratonic margin in the late Early Proterozoic followed by stacking–crustal penetrating imbrication and ramping associated with the Middle Proterozoic Grenvillian orogeny. The Archean Kapuskasing structural zone, a prominent northeast-trending feature that cuts obliquely across the dominant east-west structures of the Superior Province, is interpreted as a thin thrust sheet, soled by a variably reflective décollement, above which about 70 km of crustal shortening has occurred to bring mid-crustal to lower crustal rocks to the surface, and below which the Moho deepens. The shortening may have been accomplished by brittle faulting and erosion at levels above 20 km and ductile folding or faulting in the lower crust. Preliminary studies in the Archean Abitibi greenstone belt indicate that two major fault zones, the Larder Lake–Cadillac and Porcupine–Destor, which host significant mineralization, were generated by crustal-scale thrust and (or) strike-slip tectonics. Archean crustal sections are as structurally diverse and complex as their Proterozoic and Phanerozoic counterparts. The reflection Moho has highly variable characteristics as imaged within transects and among different transects. Crustal and Moho reflectivity observed in the various transects is caused by a wide range of features, including fault–shear zones, lithologic contacts, compositional layering, fluids in zones of high porosity, and anisotropy.
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Samson, S. D., and P. J. Patchett. "The Canadian Cordillera as a modern analogue of Proterozoic crustal growth." Australian Journal of Earth Sciences 38, no. 5 (December 1991): 595–611. http://dx.doi.org/10.1080/08120099108727994.
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Åhäll, Karl-Inge, and James N. Connelly. "Long-term convergence along SW fennoscandia: 330m.y. of proterozoic crustal growth." Precambrian Research 161, no. 3-4 (March 10, 2008): 452–74. http://dx.doi.org/10.1016/j.precamres.2007.09.007.
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BERHE, SEIFE M. "Ophiolites in Northeast and East Africa: implications for Proterozoic crustal growth." Journal of the Geological Society 147, no. 1 (January 1990): 41–57. http://dx.doi.org/10.1144/gsjgs.147.1.0041.
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Chamberlain, Kevin R., Carol D. Frost, and B. Ronald Frost. "Early Archean to Mesoproterozoic evolution of the Wyoming Province: Archean origins to modern lithospheric architecture." Canadian Journal of Earth Sciences 40, no. 10 (October 1, 2003): 1357–74. http://dx.doi.org/10.1139/e03-054.
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Local preservation of 3.63.0 Ga gneisses and widespread isotopic evidence for crust of this age incorporated into younger plutons indicates that the Wyoming Province was a [Formula: see text] 100 000 km2 middle Archean craton, which was modified by late Archean magmatism and tectonism and Proterozoic extension and rifting. On the basis of differences in late Archean histories, the Wyoming Province is subdivided into five subprovinces: three in the Archean core, (1) the Montana metasedimentary province, (2) the Bighorn subprovince, and (3) the Sweetwater subprovince, and two Archean terrains that may be allochthonous to the 3.0 Ga craton, (4) the Sierra Madre Medicine Bow block, and (5) the Black Hills Hartville block. A thick, fast lower crustal layer, imaged by Deep Probe, corresponds geographically with the Bighorn subprovince and may be an underplate associated with ca. 2.70 Ga mafic magmatism. The Sweetwater subprovince is characterized by an eastwest tectonic grain that was established by three or more temporally related, late Archean, pulses of basin development, shortening, and arc magmatism. This tectonic grain, including the 2.62 Ga Oregon Trail structure, controlled the locations and orientations of Proterozoic rifting and Laramide uplifts. The present-day lithospheric architecture of the Wyoming Province is the result of cumulative processes of crustal growth and tectonic modification; lithospheric contrasts have apparently persisted for billions of years. If there has been any net crustal growth of the Wyoming Province since 3.0 Ga, it has involved a combination of mafic underplating and arc magmatism.
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McLaren, Sandra, Mike Sandiford, and Roger Powell. "Contrasting styles of Proterozoic crustal evolution: A hot-plate tectonic model for Australian terranes." Geology 33, no. 8 (August 1, 2005): 673–76. http://dx.doi.org/10.1130/g21544ar.1.
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Abstract Proterozoic terranes in Australia record complex tectonic histories in the interval 1900– 1400 Ma that have previously been interpreted by means of simple intracratonic or plate-tectonic models. However, these models do not fully account for (1) repeated tectonic reactivation (both orogenesis and rifting), (2) mainly high-temperature–low-pressure metamorphism, (3) rifting and sag creating thick sedimentary basins, (4) the nature and timing of voluminous felsic magmatism, (5) relatively large aspect ratio orogenic belts, and (6) a general paucity of diagnostic plate-boundary features. A key to understanding these histories is the observation that Australian Proterozoic terranes are characterized by an extraordinary, but heterogeneous, enrichment of the heat-producing elements. This enrichment must contribute to long-term lithospheric weakening, and thus we advocate a hybrid lithospheric evolution model with two tectonic switches: plate-boundary–derived stresses and heat-producing-element–related lithospheric weakening. The Australian Proterozoic crustal growth record is therefore a function of the magnitude of these stresses, the way in which the heat-producing elements are distributed, and how both of these change with time.
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DOWNES, H., P. PELTONEN, I. MÄNTTÄRI, and E. V. SHARKOV. "Proterozoic zircon ages from lower crustal granulite xenoliths, Kola Peninsula, Russia: evidence for crustal growth and reworking." Journal of the Geological Society 159, no. 5 (September 2002): 485–88. http://dx.doi.org/10.1144/0016-764901-162.
Full textDissertations / Theses on the topic "Proterozoic crustal growth"
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Schaefer, Bruce F. "Isotopic and geochemical constraints on proterozoic crustal growth from the Mt. Painter inlier /." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09SB/09sbs294.pdf.
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Mellqvist, Claes. "Proterozoic crustal growth along the Archaean continental margin in the Luleå area, northern Sweden." Licentiate thesis, Luleå tekniska universitet, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18235.
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Mellqvist, Claes. "Proterozoic crustal growth along the archaean continental margin in the Luleå and Jokkmokk areas, northern Sweden /." Luleå, 1999. http://epubl.luth.se/1402-1544/1999/24/index.html.
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Stewart, Kathryn. "High temperature felsic volcanism and the role of mantle magmas in proterozoic crustal growth : the Gawler Range volcanic province /." Title page, contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phs8488.pdf.
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Benton, Rachel Yvette. "A petrological, geochemical and isotopic investigation of granitoids from the Olary Province of South Australia : implications for proterozoic crustal growth /." Title page, contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09S.B/09s.bb4782.pdf.
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Thesis (B. Sc.(Hons.))--University of Adelaide, Dept. of Geology and Geophysics, 1995.National Grid Reference (SI 54-2) 1:250 000. Two folded maps in pocket inside back cover. Includes bibliographical references (leaves 62-68).
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Laurent, Oscar. "Les changements géodynamiques à la transition Archéen-Protérozoïque : étude des granitoïdes de la marge Nord du craton du Kaapvaal (Afrique du Sud)." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00846827.
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La composition chimique de la croûte continentale a significativement évolué à la transition Archéen-Protérozoïque (3000-2500 Ma), témoignant de changements géodynamiques majeurs à cette époque. Afin d'étudier l'expression et les origines de ces changements, qui sont encore mal contraints, j'ai étudié une diversité de granitoïdes qui se sont mis en place dans cette gamme d'âges à la marge Nord du craton du Kaapvaal, en Afrique du Sud. Ce travail a permis de préciser la typologie et l'origine des granitoïdes tardi-archéens ; ceux-ci peuvent être classés dans trois grands groupes : (1) Les sanukitoïdes, représentés en Afrique du Sud par le pluton de Bulai, sont des magmas dérivant de l'interaction entre une péridotite mantellique et un composant riche en éléments incompatibles (TTG, liquide issu de la fusion de sédiments, et, plus rarement, fluide aqueux). Les sanukitoïdes peuvent être classés en deux groupes distincts, selon les mécanismes de cette hybridation : les low-Ti sanukitoids proviennent d'une simple hybridation du liquide silicaté avec la péridotite, alors que les high-Ti sanukitoids sont issus de la fusion d'un assemblage métasomatique à amphibole et phlogopite, résultant de ces interactions. Enfin, les mécanismes de différenciation des suites sanukitoïdes au niveau de la croûte sont contrôlées par des mécanismes de cristallisation fractionnée ou (moins vraisemblablement) de fusion partielle. (2) Les sanukitoïdes " marginaux ", représentés dans le craton du Kaapvaal par les plutons de Mashashane, Matlala, Matok et Moletsi, sont des granitoïdes résultant de l'interaction entre des sanukitoïdes et des magmas provenant de la fusion de croûte préexistante. Etant donné la large gamme de sources possibles (TTG, métasédiments, roches mafiques) d'un craton à l'autre, ce groupe est extrêmement diversifié. Leurs mécanismes de différenciation sont contrôlés par la cristallisation fractionnée. (3) Certains granites, tels que le batholite de Turfloop en Afrique du Sud, sont directement issus de la fusion de lithologies crustales (TTG, métasédiments et amphibolites). Au sein du craton du Kaapvaal, l'évolution spatio-temporelle du magmatisme tardi-archéen suit un schéma très caractéristique : les TTG se mettent en place entre ~3300 et ~2800 Ma, puis laissent la place à la genèse de l'ensemble des granitoïdes présentés ci-dessus, qui se déroule entre 2780 et 2590 Ma. Cette séquence d'évènements est reproduite au sein de tous les cratons du monde à la fin de l'Archéen. Elle témoigne de l'avènement des processus de recyclage crustal, puisque, par opposition aux TTG archéennes qui dérivent de métabasaltes juvéniles, les magmas tardi-archéens sont issus à la fois de la différenciation intracrustale et de l'interaction entre une péridotite et du matériel continental introduit dans le manteau. Cette dualité de processus pétrogénétiques est aussi très typique des épisodes magmatiques qui ont lieu à la fin des cycles de subduction-collision post-archéens. Ainsi, l'évolution de la composition des granitoïdes entre 3000 et 2500 Ma traduit vraisemblablement l'initiation d'une forme de tectonique des plaques proche du régime actuel. Celle-ci serait liée au refroidissement planétaire global, qui a probablement entraîné un " effet de seuil " dans l'évolution de l'épaisseur de la croûte océanique ainsi que la rhéologie et le volume de la croûte continentale, permettant ainsi à la subduction et à la collision de ne devenir thermo-mécaniquement stables qu'à partir de la fin de l'Archéen.
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Schaefer, B. F. "Isotopic and geochemical constraints on Proterozoic crustal growth from the Mt Painter Inlier." Thesis, 1993. http://hdl.handle.net/2440/88129.
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This item is only available electronically.The Mt Painter Inlier comprises sequences of Palaeo-Mesoproterozoic metasediments, granitoids and granites. The igneous suites are geochemically similar to penecontemporaneous Australian I- and A-type granites, and contain elevated immobile element concentrations relative to Phanerozoic analogues. The metasedimentary sequences indicate shallow water, intracontinental depositional environments and isotope studies suggest short transport distance and local provenance. Nd depleted mantle model ages for the oldest granitoids and metasediments are clustered around 2.1-2.4 Ga, with the younger granitic units returning older model ages of 2.9-3.3 Ga. The 2.1-2.4 Ga event is correlated with events of similar age from other Australian terrain, and is interpreted to represent a period of major continental crustal growth in Australia. The Archaean model ages for the younger granite sites are older than those of the neighbouring Gawler Craton, and may represent the juxtaposition of hitherto undocumented Archaean terrain prior to ~1700 Ma. Proterozoic tectonic processes must therefore be responsible for the relative movement of stable cratonic nucleii on large scales in order to produce allochthonous juxtaposition. The Mt Painter Inlier therefore records an active tectonic evolution throughout the Proterozoic, incorporating continental crustal growth periods between 2.1-2.4 and ~3 Ga. Tectonic activity continues to the present day, with both the Delamerian Orogeny and ongoing Tertiary thrusting processes being responsible for the current morphology of the inlier.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 1993
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Stewart, Kathryn. "High temperature felsic volcanism and the role of mantle magmas in proterozoic crustal growth : the Gawler Range volcanic province / by Kathryn P. Stewart." Thesis, 1992. http://hdl.handle.net/2440/21477.
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Includes one folded map in pocket in back cover.Includes bibliographical references.
iv, 214, [46] leaves, [10] leaves of plates : ill. (some col.), col. maps ; 30 cm.
Thesis (Ph.D.)--University of Adelaide, Dept. of Geology and Geophysics, 1994
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Benton, R. Y. "A petrological, geochemical and isotopic investigation of granitoids from the Olary Province of South Australia – implications for Proterozoic crustal growth." Thesis, 1994. http://hdl.handle.net/2440/120547.
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This item is only available electronically.Analysis of granitoids from the Olary Block of South Australia, gave rise to the identification of three genetically different granitoids. The Bimbowrie Granite, characterised by high Al203, CaO, K2O, P205, Rb, Sr, Pb, Zn and low Na20, Nb, Zr, Ga and Y is an S-type granite, considered to be largely a product of partial anatexis and melt segregation from adjacent and underlying migmatitic metasediments during a high grade metamorphic event. The Basso Granodiorite with high Si02, Zr, Nb, Y and LREE and low CaO, Al203, MgO, V, Ba and Sr is a typical A-type granite, that is it formed from remelting of crust from which earlier granites had been extracted, or alternatively from fractionation of basaltic magma. It intrudes the host metasediments and is subsequently intruded by the Bimbowrie Granite. Thirdly, the Antro Tonalite exhibits I-type characteristics with high Fe203, Na20, CaO and Ti02 levels and low LREE and K2O. Rb-Sr dating produced an isochron age of 1642 ± 5 Ma for the Basso Granodiorite and metasedimentary units. The Rb-Sr isotope system is easily reset, and generally registers significantly younger ages. Hence, 1642 ± 5 Ma may reflect the timing of a metamorphic/deformational event. Sm-Nd isotope investigations into the Olary Block revealed a clustering of model ages. The Bimbowrie Granite has DM model ages of 2.6 - 2.67 Ga, recording the age of extraction from the mantle. One sample did however produce an age of 3.28 Ga, reflecting the granite’s source. That is, it may be sampling metasediment derived from older crust, present either as a basal sequence upon which the current stratigraphy is deposited or alternatively it may be sourcing a metasedimentary pile with a greater crustal residence time than the exposed metasediments. DM model age for the metasediment of 2.55 Ga further supports the notion that the Bimbowrie Granite formed as a result of in situ melting of the metasedimentary sequence. 2.12 - 2.13 Ga DM model ages were determined for the Basso Granodiorite. One sample did however have a TDM similar to the S-type granites of 2.61 Ga; this clearly indicates crustal contamination of this sample during emplacement, whereas the other samples reflect true mantle separation ages. Regardless of the exact rates of crustal growth, it is clear that large volumes of continental crust were formed during the Palaeo- Mesoproterozoic. Identification of crustal production peaks for the Australian continent at -3600 Ma, -2600 Ma, -2200 Ma and -1800 Ma by McCulloch (1987), are reinforced by the data obtained herein. Two peaks were established, one at -2600 Ma for the Bimbowrie Granite and the other at -2200 for the Basso Granodiorite. Controversy still remains over whether these periods are discrete growth episodes or simply reflect a variation in the rate of recycling of continental crust into the mantle.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1994
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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.
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The Barossa Complex, southeast Gawler Craton, South Australia, forms the southeastern-most exposure of pre-Neoproterozoic crust in Australia. Understanding the geodynamic evolution of this area can improve paleogeographic reconstructions of the economically significant Gawler Craton, as well as global reconstructions in the Proterozoic. The first part of this thesis addresses the geological development of the Barossa Complex during the Palaeo-Mesoproterozoic.
The Barossa Complex is composed of metasedimentary and metaigneous gneisses. These include calcsilicate, quartzofeldspathic, psammopelitic, and pelitic gneisses. In the northern inliers, the protoliths to these gneisses are indicative of a progressively deepening basin. Syndepositional felsic orthogneisses and mafic amphibolites indicate a tectonically active basin.
Deposition of the metasedimentary protoliths to the Barossa Complex occurred between 1730-1655 Ma, synchronous to the onset of the Kimban Orogeny in the Gawler Craton and the deposition of the Willyama Supergroup in the Curnamona Province. U-Pb and Hf isotopic analyses from detrital zircon indicates sediment was largely derived from the Gawler Craton. Syndepositional granite intrusions occurred in the northern extent of the Barossa Complex at 1717 ±7 Ma.
Metamorphism initiated in the Barossa Complex at c. 1630 Ma with the development of a low angle metamorphic fabric. Peak granulite conditions of approximately 8-9 kbar and 800-850 °C occurred at c. 1590 Ma in the southern Barossa Complex. The northern Barossa Complex preserves lower grade metamorphic features and c. 1600 Ma zircon with hydrothermal Rare Earth Element (REE) signatures, which are potentially linked to the Hiltaba event in the Gawler Craton. Post peak metamorphism continued until c. 1550 Ma and is associated with retrograde shear zones in the southern Barossa Complex, and late pegmatites in the northern inliers.
The Barossa Complex shares a depositional and metamorphic history with the Willyama Supergroup in the Curnamona Province and Mt. Isa Inlier basin sequences, and was part of a transcontinental plate margin system during the Late Palaeo- Early Mesoproterozoic. East dipping subduction was the likely driver for extensive rift basin development across the eastern margin of Proterozoic Australia before the Isan-Olarian Orogeny inverted these basins. The Barossa Complex is the southern-most exposure of this system.
The second part of this thesis addresses the use of detrital zircon in modern sediment as a means of characterising the bedrock of a catchment area, which has been used previously in the Gawler Craton and Curnamona Province.
In the Broken Hill area of the Curnamona Province, stream sediments were sampled from drainage pathways with catchments that have stratigraphically and chronologically well characterised bedrock lithologies. Zircon ages from the modern sediment found up to 30% of the zircons were significantly younger than what expected from the bedrock sources (>1.6 Ga). Aeolian dune sands from the Strzelecki Desert to the north of the study area are found to contain zircon with U-Pb and Lu-Hf isotopic compositions matching the ‘exotic’ zircon populations in Broken Hill. Aeolian detritus is considered to have contributed zircon to the stream sediments in Broken Hill, and should be considered in any study utilising modern detritus in arid environments. Detrital zircon provenance studies of the geological record should be interpreted cautiously if aeolian input may have occurred.Thesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Physical Sciences, 2018
Book chapters on the topic "Proterozoic crustal growth"
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Reymer, Arthur P. S., and Gerald Schubert. "Phanerozoic and Precambrian crustal growth." In Proterozic Lithospheric Evolution, 1–9. Washington, D. C.: American Geophysical Union, 1987. http://dx.doi.org/10.1029/gd017p0001.
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Patchett, P. J. "Chapter 13 Isotopic Studies of Proterozoic Crustal Growth and Evolution." In Proterozoic Crustal Evolution, 481–508. Elsevier, 1992. http://dx.doi.org/10.1016/s0166-2635(08)70127-0.
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R. Mir, Akhtar. "Proterozoic Newer Dolerite Dyke Swarm Magmatism in the Singhbhum Craton, Eastern India." In Geochemistry and Mineral Resources [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104833.
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Precambrian mafic magmatism and its role in the evolution of Earth’s crust has been paid serious attention by researchers for the last four decades. The emplacement of mafic dyke swarms acts as an important time marker in geological terrains. Number of shield terrains throughout the world has been intruded by the Precambrian dyke swarms, hence the presence of these dykes are useful to understand the Proterozoic tectonics, magmatism, crustal growth and continental reconstruction. Likewise, the Protocontinents of Indian Shield e.g. Aravalli-Bundelkhand, Dharwar, Bastar, and Singhbhum Protocontinent had experienced the dyke swarm intrusions having different characteristics and orientations. In Singhbhum craton, an impressive set of mafic dyke swarm, called as Newer dolerite dyke swarm, had intruded the Precambrian Singhbhum granitoid complex through a wide geological period from 2800 to 1100 Ma. Present chapter focuses on the published results or conclusions of these dykes in terms of their mantle source characteristics, metasomatism of the mantle source, degree of crustal contamination and partial melting processes. Geochemical characteristics of these dykes particularly Ti/Y, Zr/Y, Th/Nb, Ba/Nb, La/Nb, (La/Sm)PM are similar to either MORB or subduction zone basalts that occur along the plate margin. The enriched LREE-LILE and depletion of HFSE especially Nb, P and Ti probably indicate generation of these dykes in a subduction zone setting.
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Rogers, John J. W., and M. Santosh. "Growth of Cratons and their Post-Stabilization Histories." In Continents and Supercontinents. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780195165890.003.0006.
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As we have seen in chapter 3, continental crust evolved from regions of the mantle that contained higher concentrations of LIL elements than regions that underlie typical ocean basins. The most complete record of this evolutionary process is in cratons, which passed through periods of rapid crust production to times of comparative stability over intervals of several hundred million years. After the cratons became stable enough to accumulate sequences of undeformed platform sediments, they moved about the earth without being subjected to further compressive tectonic activity. Because many of the cratons are also partly covered by sediments that are unmetamorphosed or only slightly metamorphosed, they appear to have undergone very little erosion since the sediments were deposited. Thus, a craton may be considered as a large block of continental crust that has been permanently removed from the crustal recycling process. This chapter starts with a discussion of the history of cratons as interpreted from studies of the upper part of the crust. We describe the Superior craton of the Canadian shield and the Western Dharwar craton of southern India within the chapter and use appendix E for brief summaries of other typical cratons. These cratons and numerous others elsewhere developed at different times during earth history, and we look for similarities and differences that may have been caused by progressive cooling of the earth (chapter 2). This section concludes with a summary of the general evolution of cratons and the meaning of the terms “Archean” and “Proterozoic.” The following section is an investigation of processes that occurred following stabilization, all of which take place in the presence of fluids that permeate the crust. We include a summary of these fluids and their effects on anorogenic magmatism and separation of the lower and upper crust. The final section discusses the relationship between cratons and their underlying subcontinental lithospheric mantle (SCLM). Continual metasomatism and metamorphism of the SCLM after cratons develop above it apparently has not destroyed the relationship between the ages of the cratons and the concentrations of major elements in the SCLM. This provides us with an opportunity to determine whether cratons evolved from the mantle beneath them or by depletion of much larger volumes of mantle. The discussions in this chapter are based partly on information summarized in appendices B (heat flow) and D (isotopes).
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Swanson-Hysell, Nicholas L., Toby Rivers, and Suzan van der Lee. "The late Mesoproterozoic to early Neoproterozoic Grenvillian orogeny and the assembly of Rodinia: Turning point in the tectonic evolution of Laurentia." In Laurentia: Turning Points in the Evolution of a Continent. Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.1220(14).
Full textAbstract:
ABSTRACT The amalgamation of Laurentia’s Archean provinces ca. 1830 Ma was followed by ~700 m.y. of accretionary orogenesis along its active southeastern margin, marked by subduction of oceanic lithosphere, formation of arcs and back-arcs, and episodic accretion. This prolonged period of active-margin tectonic processes, spanning the late Paleoproterozoic and Mesoproterozoic eras, resulted in major accretionary crustal growth and was terminated by closure of the Unimos Ocean (new name). Ocean closure was associated with rapid motion of Laurentia toward the equator and resulted in continental collision that led to profound reworking of much of the accreted Proterozoic crust during the ca. 1090–980 Ma Grenvillian orogeny. The Grenvillian orogeny resulted in formation of a large, hot, long-duration orogen with a substantial orogenic plateau that underwent extensional orogenic collapse before rejuvenation and formation of the Grenville Front tectonic zone. The Grenvillian orogeny also caused the termination and inversion of the Midcontinent Rift, which, had it continued, would likely have split Laurentia into distinct continental blocks. Voluminous mafic magmatic activity in the Midcontinent Rift ca. 1108–1090 Ma was contemporaneous with magmatism in the Southwestern Laurentia large igneous province. We discuss a potential link between prolonged subduction of oceanic lithosphere beneath southeast Laurentia in the Mesoproterozoic and the initiation of this voluminous mafic magmatism. In this hypothesis, subducted water in dense, hydrous Mg-silicates transported to the bottom of the upper mantle led to hydration and increased buoyancy, resulting in upwelling, decompression melting, and intraplate magmatism. Coeval collisional orogenesis in several continents, including Amazonia and Kalahari, ties the Grenvillian orogeny to the amalgamation of multiple Proterozoic continents in the supercontinent Rodinia. These orogenic events collectively constituted a major turning point in both Laurentian and global tectonics. The ensuing paleogeographic configuration, and that which followed during Rodinia’s extended breakup, set the stage for Earth system evolution through the Neoproterozoic Era.
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Dickin, Alan P. "Mesoproterozoic and Paleoproterozoic crustal growth in the eastern Grenville Province: Nd isotope evidence from the Long Range inlier of the Appalachian orogen." In Memoir 197: Proterozoic Tectonic Evolution of the Grenville Orogen in North America, 495–503. Geological Society of America, 2004. http://dx.doi.org/10.1130/0-8137-1197-5.495.
Full textConference papers on the topic "Proterozoic crustal growth"
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Johnson, Simon P., Fawna J. Korhonen, Christopher L. Kirkland, John B. Cliff, Elena Belousova, and Stephen Sheppard. "AN ISOTOPIC PERSPECTIVE ON GROWTH AND DIFFERENTIATION OF PROTEROZOIC OROGENIC CRUST: FROM SUBDUCTION MAGMATISM TO CRATONIZATION." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-304863.
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