Showing papers in "Precambrian Research in 2008"

TL;DR: A brief synthesis of the current state of knowledge on the formation and break-up of the early Neoproterozoic supercontinent Rodinia and the subsequent assembly of Gondwanaland is presented in this paper.

TL;DR: Based on the tectonic evolution and stratigraphic sequence, the Tarim Craton can be subdivided into an older, pre-Nanhua metamorphic basement and a younger sedimentary cover consisting of strata from the Nanhua System.

TL;DR: In this article, a combined study of zircon U-Pb and Lu-Hf isotopes, mineral O isotope, whole-rock elements and Sr-Nd isotopes was carried out for Neoproterozoic volcanics and granites from the eastern part of the Jiangnan Orogen in South China.

TL;DR: In this paper, the authors review the record of large igneous provinces (LIPs) emplaced during the 1600-700-Ma interval and identify such spatially separated but coeval LIPs at 1460, 1380, 1270, and 1115-1070-Ma.

TL;DR: The Luliangian Orogeny is one of the most important events in the Precambrian evolution of the North China Craton and is considered to be part of the global-scale 2.0-1.8-Ga collisional events that led to the assembly of a Paleo-Mesoproterozoic Columbia supercontinent.

TL;DR: The evolution of the western and eastern parts of the East European Craton followed very different paths from ca. 1.7 and 1.6-Ga to 1.4-Ga as discussed by the authors, and the differences of tectonic regime in the east and western parts of this Craton were determined by the movement and rotation of this megaterrane concomitantly with the Rodinia assembly.

TL;DR: In this article, the authors used SHRIMP U-Pb analysis to identify the earliest arc-related magmatic event in the Luliang Complex, which was followed by the intrusion of the Guojiazhuang gneisses at 2375−±-10−Ma and the Chijianling-Guandishan granitoid at 2199−−2173−Ma.

TL;DR: In this paper, a study of zircons using combined cathodoluminescence imaging and SHRIMP U-Pb dating indicates that the Baijiafen and Dongshan gneisses record several stages of granitic magmatism.

TL;DR: The western two-thirds of Australia is underlain by Precambrian rocks that are divisible into three Archean to Paleoproterozoic cratons.

TL;DR: A newly recognized remnant of a Paleoproterozoic Large Igneous Province has been identified in the southern Bastar craton and nearby Cuddapah basin from the adjacent Dharwar craton, India as mentioned in this paper.

TL;DR: In this paper, the authors used LA-ICPMS zircon U-Pb dating of three plutons from eastern Hebei, eastern North China Craton, record emplacement ages of 2526-2515-Ma and metamorphic ages of 2500-2490-Ma for the diorite, granodiorite and monzogranite and 2440-1.0-Ga for the K-feldspar granite.

TL;DR: In this paper, it is argued that the Grenville Province is a large hot long-duration orogen with a plateau in the hinterland, remnants of which are preserved in the hangingwall of the Allochthon Boundary Thrust and characterised by metamorphism from ca. 1090 to 1020 Ma (Ottawan phase of the Grenvillian Orogeny).

TL;DR: The Kalahari Craton was formed from a small composite Archaean core which grew by prolonged crustal accretion in the Palaeoproterozoic along its NW side (Magondi-Okwa-Kheis Belt, Rehoboth Subprovince) to form the Proto-Kalahari as discussed by the authors.

TL;DR: In this paper, the authors reported LA-ICP-MS (laser ablation inductively coupled plasma mass spectrometry) and Hf isotopic data for detrital zircons from the North and South Liaohe Groups.

TL;DR: In this article, detrital zircons from late Neoproterozoic sediments of the Cathaysia block, South China, show abundant Grenville-age (∼1.7-1.4) and Pan-African (0.70-0.54) populations.

TL;DR: Paleomagnetic data derived from the Bhander and Rewa groups of the Vind- hyanchal Basin has been used to estimate the age of the Upper Vindhyan sequence as mentioned in this paper.

TL;DR: In this article, zircon U-Pb ages, whole-rock major and trace elements as well as Rb-Sr and Sm-Nd isotopes, and mineral O isotopes were determined for ultrahigh pressure (UHP) granitic gneiss and enclosed eclogite in the Jiaodong terrane, a petrotectonic unit southeast of the Wulian-Yantai fault.

TL;DR: In this paper, a 16-point Sm-Nd whole-rock isochron was used to estimate the age of komatiite lavas from Sargur Group greenstone belts of the western Dharwar craton.

TL;DR: In this article, detailed stratigraphic, petrographic, and zircon U-Pb geochronological data are provided for surface outcrops and newly obtained, unweathered drillcore intersections of Earth's oldest fossiliferous sedimentary rocks, the lowermost chert-barite unit of the ca. 3.5 Ga Dresser Formation, Warrawoona Group, Pilbara Craton.

TL;DR: In this paper, older and younger granitoids from the Egyptian basement complex were analyzed for chemical composition, SHRIMP U-Pb zircon ages, and Sm-Nd isotopic compositions.

TL;DR: In this paper, the best candidates to represent possible fragments of such mobile belts were recognized in the Punta del Este, Uruguay, terrain, in the Serra do Itaberaba, Sao Paulo, eastern Brazil area and in the Cariris Velhos, northeastern Brazil area.

TL;DR: In this paper, the authors used the electron microprobe chemical dating technique to identify the timing and regional distribution of tectonothermal events within the Eastern Ghats belt of peninsular India.

TL;DR: The analysis of Siberian basement geology, Meso-to Neoproterozoic sedimentary successions and magmatism together with recent palaeomagnetic and geochronological data suggest that Siberia could be a promontory of Rodinia as mentioned in this paper.

TL;DR: In this paper, the authors used the integration of available maps and isotopic data together with new U-Pb and Sm-Nd analyses from 20 samples (plus 55 earlier dates) to establish the timing of geologic events in the West Amazon Craton from 1840 to 1110.

TL;DR: The Rahaba-Absol terrane is part of the Saharan Metacraton and is in tectonic contact with the high-grade metamorphic Kurmut terrane of eastern Bayuda Desert.

TL;DR: In this article, the zircons can be broadly divided into three age populations, at: 2.0-1.8, 2.45-2.1, and 2.5-5-Ga.

TL;DR: The Yanbian Group in the western margin of the Yangtze Block is a well-preserved Neoproterozoic volcanic-sedimentary sequence and provides a rare opportunity to examine the provenance and tectonic setting.

TL;DR: In this article, a convergent plate boundary along the southern margin of the proto-Australian continent during the Palaeo-to-Mesoproterozoic (1800-1600 ǫ) was investigated.

TL;DR: In this paper, it was shown that even best case scenarios for HCHO steady-state concentrations in the primitive oceans are too low for the formation of sugars to occur, and that other geochemical mechanisms such as eutectic freezing and conversion to non-volatile derivatives by reaction with other species present in primitive environment, followed by evaporation, could have concentrated HCHO sufficiently to allow for sugar synthesis.