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Precambrian Research
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#1Hong-Xu Chen (CAS: Chinese Academy of Sciences)H-Index: 11
#2Jia-Hui Liu (CAS: Chinese Academy of Sciences)H-Index: 3
Last.Chun-Ming Wu (CAS: Chinese Academy of Sciences)H-Index: 16
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Abstract As a key accessory mineral in metapelite, monazite forms in the metamorphic event and therefore, places important direct constraint on the timing of the tectono-metamorphic event. In this study, we investigate four representative metapelites from different metamorphic terranes in the central-south Trans-North China Orogen (TNCO), applying secondary ion mass spectrometry (SIMS) U-Th-Pb dating on monazite. The dating results reveal that monazite collected from the Huashan, Luoning, Zanhua...
#1Hanbiao Xian (China University of Geosciences)
#2Shihong Zhang (China University of Geosciences)H-Index: 12
Last.Huaichun Wu (China University of Geosciences)H-Index: 22
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Abstract New geochronological and palaeomagnetic data are presented for the Madiyi Formation of the lower Banxi Group in the South China Block (SCB). Zircon U–Pb dating of two tuff beds within the sampled section yielded consistent ages of 801.9 ± 6.3 Ma and 804.6 ± 9.6 Ma. A total of 137 palaeomagnetic samples were collected and thermally stepwise demagnetized. Three components were isolated. Component A was identified in 30 samples below 300°C. It has a mean direction resembling the recent geo...
#1Dongjian Ouyang (CAS: Chinese Academy of Sciences)
#2Jinghui Guo (CAS: Chinese Academy of Sciences)H-Index: 47
Last.Guangyu Huang (CAS: Chinese Academy of Sciences)H-Index: 3
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Abstract An Archean–Paleoproterozoic (A–P) A-type granite 15 km wide and 25 km long has been identified in the Daqingshan area south of the Yinshan Block (YB), North China Craton (NCC). Known as the Jinpen pluton, this body is the largest individual granite pluton in the Daqingshan area. Its crystallization ages of 2460–2450 Ma has been determined precisely using the secondary ion mass spectrometer (SIMS) zircon U–Pb method. The Jinpen pluton is lithologically homogeneous, consisting mainly of g...
#1R.T. Ratheesh-Kumar (CUSAT: Cochin University of Science and Technology)
#2B.F. Windley (University of Leicester)H-Index: 4
Last.F.K. Zeba-Nezrin (CUSAT: Cochin University of Science and Technology)
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Abstract This study provides a new perspective into the Archean accretionary tectonic evolution of the Dharwar Craton and the adjacent high-grade granulite blocks of southern India. The necessary constraints for this tectonic assembly were derived using new petrochemical and zircon U-Pb age data from the granulite facies Biligiri Rangan Block (BRB), which occupies a central key position in the Archean collage of southern India. The BRB, composed largely of charnockites and mafic granulites, is a...
#1H.B. McFarlane (Monash University)
#2Nicolas Thébaud (UWA: University of Western Australia)H-Index: 12
Last.Mark Jessell (UWA: University of Western Australia)H-Index: 31
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Abstract Greenstone belts preserved in the West African Craton (2300–2070 Ma) provide key information for understanding the petrogenetic processes and geodynamic setting for juvenile crust formation during a nascent Paleoproterozoic plate tectonic regime. New geochemical and isotopic data are presented for the magmatic suites exposed in Sefwi Greenstone Belt, SW Ghana. We define five distinct plutonic suites, with extrusive equivalents, including: 1) two generations of high SiO2, Na2O-rich tonal...
#2Charles VerdelH-Index: 7
Last.Ai Duc NguyenH-Index: 5
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Abstract Carbonate successions are principal geochemical archives of the extraordinary environmental changes that occurred during the Neoproterozoic Era. In this study, we present a stratigraphic record of carbonate rare earth element (REE) compositions from Neoproterozoic and Cambrian strata in central and southern Australia. The new REE results provide insight into the redox conditions of the Neoproterozoic-Cambrian ocean, the influence of glacial meltwater on carbonate precipitation, and Neop...
#1Neil A. Fernandes (Queen's University)H-Index: 1
#2Gema R. Olivo (Queen's University)H-Index: 14
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Abstract Studies of provenance and tectonic settings of Proterozoic sedimentary basins on the margins of the Sao Francisco Craton (SFC) can enhance understanding of its evolution. The Mesoproterozoic Upper Vazante Sequence is made up of siliciclastic and carbonate rocks (mainly dolomites) that were deposited on the southwestern margin of the SFC between 1300 and 1100 Ma and then thrust eastward on top of the SFC during the Neoproterozoic Brasiliano Orogeny (650 – 550 Ma). The Serra do Garrote Fo...
#1Xi Wang (China University of Petroleum)
#2Yong-Fei Zheng (USTC: University of Science and Technology of China)H-Index: 72
Last.Wenbin Zhu (NU: Nanjing University)H-Index: 22
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Abstract The North China Craton experienced two phases of tectonothermal events at ca. 2.8-2.7 Ga and ca. 2.6-2.5 Ga, respectively. Although 2.6-2.5 Ga granitic gneisses and metavolcano-sedimentary sequences are widespread in the craton, the major stage of crustal growth has been determined to occur at 2.8-2.7 Ga in terms of whole-rock Sm-Nd and zircon Lu-Hf isotope studies. It has been intriguing how the vast 2.8-2.7 Ga juvenile mafic crust would have differentiated into the 2.6-2.5 Ga felsic c...
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