Showing papers in "Precambrian Research in 2012"

TL;DR: In this article, the authors proposed a model for the origin of the 2.55-2.50-Ga metamorphic pulse in the North China Craton (NCC), which is interpreted as a major phase of juvenile crustal growth in the craton.

TL;DR: In this article, a model for assembly and stabilization of the various Archean blocks of the NCC in the Paleoproterozoic has been proposed, based on the analysis of available stratigraphic, structural, geochemical, metamorphic and geochronologic data.

TL;DR: In this paper, the authors present a synthesis of the salient features of the UHT rocks from the NCC including petrologic indicators, fluid characteristics, and monazite and zircon chronometry on the extreme crustal metamorphism.

TL;DR: In this article, the authors compare the oldest rocks of the Cathaysia block with other Paleoproterozoic orogens worldwide, and argue that its closest affinity is with the South Korean Peninsula and the Lesser Himalaya of NW India.

TL;DR: Sapphirine granulites in the Daqingshan and Jining areas in the Palaeoproterozoic Khondalite belt are always in contact with meta-gabbronorite dykes, implying a causal relationship.

TL;DR: In this paper, structural analysis of the southern segment of the Jiao-Liao-Ji Belt has been carried out and it has been shown that most of the rocks in all the units of the south segment underwent three distinct episodes of folding (D1 to D3) and two stage of ductile thrust shearing (STZ1 coeval to D1, STZ2 between D2 and D3).

TL;DR: In this paper, two phases of syenogranite magmatism are recognized based on geological relationships, degree of metamorphism, deformation and magmatic zircon ages.

TL;DR: In this article, the authors presented a systematic geochronological and geochemical study on ca 800-760-Ma volcanic rocks in the eastern part of the Jiangnan orogen.

TL;DR: The Sibao Group as discussed by the authors is composed of flysch turbidites up to ca. 4000 m thick and has variable 177 Hf/ 176 Hf ratios (0.281194 to 0.281874) and ǫ Hf(t) values (−35.9 to 9.8), indicative of the involvement of juvenile and ancient recycled components.

TL;DR: In this paper, the authors presented LA-ICPMS zircon U-Pb data on the granitoids from Wudumen, Xishenba, Xixiang and Hanshan within the Hannan massif which show crystallization ages of 718±-9.

TL;DR: In this article, an integrated study of mineral reaction textures, mineral chemistry and pseudosection modelling in the NCFKMASHTO system with the THERMOCALC technique constrains the P-T conditions of 9.4-10kbar and 870-900°C for the M2 stage, 6.3-6.6-kbar, and 4.5-5.2

TL;DR: In this article, U-Pb zircon dating on two metamorphosed volcanic rocks from the Yejishan and Luliang groups reveals that they formed at 2210−±−13−Ma and 2213−±-47−Ma, respectively, and were metamorphous at ∼1832−Ma.

TL;DR: In situ U-Pb and Lu-Hf data on detrital zircons from Paleo- to Neoproterozoic sediments have been used to gain a clearer picture of the regional tectonic background and crustal evolution in the western part of the Yangtze Block as discussed by the authors.

TL;DR: In this paper, the authors present a reconstruction of the overall lithotectonic architecture, from inner zones to external ones, of the Paleoproterozoic Trans North China Orogen, within the North China Craton.

TL;DR: The link between the South China and Tarim blocks is a key issue in defining the tectonic framework of China as mentioned in this paper, which is marked by the presence of a juvenile Grenville-age continental margin that had been subducted to and exhumed from mantle depths of 100-200 km at the present-day location of northern Tibetan Plateau.

TL;DR: In this article, representative experts working in the North China, South China and Tarim cratons to present overviews or detailed studies on the formation and tectonic evolution of major Precambrian blocks in China.

TL;DR: Zhang et al. as mentioned in this paper reported an integrated study of zircon U-Pb age, major and trace element data and isotope compositions for gray gneisses from the Houhe complex in the northwestern part of the Yangtze Block.

TL;DR: In this article, the authors used the Precambrian mafic dykes intruding granitoids and supracrustals of the Archean Bundelkhand craton (BC) in northern Penin-Sular India to constrain the position of India at 2.0 and 1.1 Ga.

TL;DR: The Madurai Block of southern India is rich in granitic orthogneiss, much of which is orthopyroxene-bearing (charnockite) as mentioned in this paper.

TL;DR: In this paper, a combined study of geochronology and geochemistry was carried out for the Fuchuan ophiolite in the eastern Jiangnan orogen, South China.

TL;DR: In this article, secondary ion mass spectrometry (SIMS) was used to estimate the ages of zircons in plagiogranites and gabbros from a suprasubduction zone ophiolitic complex at Manamedu, located along the southern periphery of the Palghat-Cauvery Suture Zone.

TL;DR: In this article, the Kibara Belt has been defined as the part of a NW oriented Palaeoproterozoic basement high of the Ubende-Rusizi Belts.

TL;DR: In this paper, the authors presented new zircon and baddeleyite SHRIMP, LA-ICP-MS and SIMS U-Pb analyses on representative samples of the diabase sills emplaced into the Wumishan, Tieling and Xiamaling Formations.

TL;DR: The Shirengou BIF is an Algoma type deposit formed in an arc-related basin in the Neoarchean as mentioned in this paper, which is a typical BIF deposit located in eastern Hebei province in the North China Craton.

TL;DR: David et al. as mentioned in this paper used the Ujaraaluk isochron to estimate the minimum formation age of the Nuvvuagittuq Greenstone Belt (NGB) in Northern Quebec, Canada.

TL;DR: In this article, the authors identify an Eoeburnean (pre-Tarkwaian) deformation event (D1) that produced significant deformation in the Sefwi Group metavolcanics, which is associated with N-S shortening manifested as regional scale folding in the southern Ashanti Belt.

TL;DR: In this article, the ages of five representative granite samples from Jinluohou (Lizhuang) and Jingju granitic complexes indicate that the magmatism took place during Paleoproterozoic, and overprinted by early Mesozoic thermal event.

TL;DR: In this paper, detrital zircon age spectra were employed to probe the Precambrian history of the region and to evaluate the link with the Proterozoic supercontinents.

TL;DR: In this paper, detrital zircon U-Pb dating and in situ Hf isotopic analysis of Devonian sandstones of the Baluntai area in Central Tianshan, which is part of the Tarim Block was performed.

TL;DR: In this article, eclogites and metapelites from the Ubende Terrane of the Proterozoic Ubendian Belt were studied for the purpose of establishing their metamorphic history.