Showing papers in "Precambrian Research in 2004"

TL;DR: Whitaker et al. as mentioned in this paper integrated U-Pb dating, Hf-isotope analysis and trace-element analysis to detrital zircon populations offers a rapid means of assessing the geochronology and crustal evolution history of different terranes within a composite craton.

TL;DR: In this article, the authors used U-Pb data and cathodoluminescence (CL) imaging to constrain the maximum depositional and metamorphic ages of the Liaohe Group, which are critical in understanding the tectonic setting and history of the Jiao-Liao-Ji Belt.

TL;DR: The Wutai granitoids have higher K 2 O, LILE and Rb/Sr but lower Sr/Y and La N /Yb N than the Fuping TTG gneisses, are characterized by Nd T DM from 2.5 to 2.8 and e Nd( t ) from 0.49 to 3.34 as mentioned in this paper.

TL;DR: In this paper, the authors identify four important crustal segments in the basement of the Sao Francisco Craton in Bahia, Brazil, which are associated with Archean greenstone belts.

TL;DR: In this article, U-Pb data reveal that during the mid-Cambrian the central part of West Gondwana was still undergoing a high-grade tectonometamorphic event corresponding to collision.

TL;DR: In this article, an integrated model of punctuated partial convective overturn of the upper and middle crust in response to dominantly magmatic processes is presented to explain the ca. 750 Myr history of the terrane.

TL;DR: In this article, high-resolution sam-pling of the pinkish cap dolostone overlying the Tereeken diamictite shows a consistent 13 C chemostratigraphic pattern (ca. −5‰ at the base and slightly decreasing upsection) similar to that of Marinoan cap carbonates.

TL;DR: The Capricorn Orogen was initiated during Palaeoproterozoic suturing events that brought together the Archaean Yilgarn and Pilbara cratons to form the West Australian Craton as discussed by the authors.

TL;DR: In this paper, the authors used ID-NTIMS data to provide a clear Late Archean-Early Paleoproterozoic age for the Malanjkhand deposit and by implication for its calc-alkaline granitoid host.

TL;DR: Based on geochemical and petrological studies of the Meso- to Neoproterozoic basic-acid rocks, a preliminary model for the formation and evolution history of the western Jiangnan orogen in the area was put forward as discussed by the authors.

TL;DR: In this article, the authors proposed a tectonic model of a full subduction-syncollision-postcollision-rifting cycle for the evolution of the NCC between 1870 and 1765 ǫ.

TL;DR: The Wutai, Fuping and Hengshan Complexes form part of a major 2.5-Ga late Archean arc system in the northern part of the North China Craton as mentioned in this paper.

TL;DR: In this article, a combined ion and electron microprobe, and SEM study of the age, Th-U chemistry, cathodoluminescence (CL) zoning patterns, and inclusions for a population of detrital zircons from Jack Hills, Western Australia, with 207Pb/206Pb ages ranging from 4348 to 1576.

TL;DR: In this paper, the trace element and Sr-isotope data for microbial carbonates from the Archaean Mushandike limestone, Masvingo Greenstone Belt, Zimbabwe were reported.

TL;DR: In this paper, the authors reported new U-Pb data from the southern sector of the Brasilia belt in order to provide temporal limits for the deposition and ages of provenance of sediments accumulated in passive margin successions around the south and southwestern margins of the Sao Francisco Craton, and date the orogenic events leading to the amalgamation of West Gondwana.

TL;DR: This paper reported a Pb-Pb isochron age of 1599±48 ǫ for the Grypania bearing Rohtas Formation of the Vindhyan Supergroup, Central India.

TL;DR: In this article, a paleomagnetic study has been carried out on the 807 ± 12 Ma Aksu dyke swarm (ADS) in the northwestern Tarim Block (NW China) in order to improve the understanding of the configuration and breakup history of the Rodinia supercontinent.

TL;DR: In this paper, single zircon grains from metasedimentary rocks of Cambrian or older age in the Sierras de Cordoba provide information on sources of continental detritus on the western paleo-margin of Gondwana.

TL;DR: The most important resources for these are small domains within high metamorphic grade Palaeoarchaean gneisses in the Archaean Craton, southern West Greenland as discussed by the authors.

TL;DR: In this paper, the ages of 14 granite intrusions from the Paje´ u-ParaBelt have been found to indicate more than 100 Ma of intrusive magmatism, which can be divided in four events: the oldest granites (between 620 and 600 Ma) are medium-to-slightly high-K calc-alkaline I-type granitoids, intruded into metagreywackes and gneiss-granites of 0.9-1.0 Ga; they are related to the peak of metamorphism and to

TL;DR: In this paper, 11 high precision SHRIMP zircon U-Pb ages have been obtained from felsic rocks within a single stratigraphic section of late Archaean volcanic and sedimentary rocks in the east Pilbara of Western Australia.

TL;DR: In this paper, the authors used high-precision U-Pb zircon techniques to date small leucogranite bodies within the Tasriwine ophiolite, Anti-Atlas Mountains, Morocco.

TL;DR: The Glenburgh Orogeny as discussed by the authors is a collision of a late Archaean to Palaeoproterozoic microcontinent (the Glenburgh Terrane) with the Archaean Yilgarn Craton and is therefore tectonically distinct as well as significantly older than the widespread 1900−1800-Ma tectonic events recorded in northern Australia.

TL;DR: The oldest fragment of continental crust recognized in South America occurs as an isolated Archean enclave in northeastern Brazil's Borborema Province, ca. 2.2-2.5 Ga and Sm-Nd TDM model ages of more than 3.7 Ga as discussed by the authors.

TL;DR: In this paper, detrital zircon geochronology can overcome the problem of overly quartzose compositions in Archaean sandstones due to severe chemical weathering and authigenic alteration, thereby enabling distinction between passive-margin and retroarc-basin stages through systematic changes in the age complexity of the source area.

TL;DR: In this paper, the authors show that the dominantly metaluminous plutons display mineralogical and geochemical characteristics of A-type granites including high FeO t /MgO ratios, high abundances of Nb, Zr, Y, Ta, and REE (except Eu), and low concentrations of Sc, Ba, Sr, and Eu.

TL;DR: The east-west trending, post-orogenic subvertical Cleaver Dykes from the Great Bear Magmatic Arc are dated by the U-Pb (baddeleyite) method to be 1740 + 5/−4 ǫ (4) Ma.

TL;DR: The Dalgaringa Supersuite as mentioned in this paper is an Andean-type batholith formed along the edge of the Glenburgh Terrane before collision with the passive margin of the Yilgarn Craton.

TL;DR: The granitoid rock dominated central Wabigoon subprovince of the Superior Province records low-K trondhjemite-tonalite-granodiorite (TTG) type magmatic episodes at as mentioned in this paper.

TL;DR: In this article, it was shown that the Yapungku Orogeny was preceded by local intrusion of granites and was most likely a collisional event between the Palaeoproterozoic West Australian and North Australian cratons between c 1830 and 1765.