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Reconstructing Cryogenian to Ediacaran successions and paleogeography of the South China Block

机译：重建低温生到南中国河南埃德加伦的古地理和古地理

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摘要

Neoproterozoic paleogeography of the South China is dominated by the formation of Rodinia, its break-up, and the subsequent amalgamation of Gondwana. Two negative excursions of the chemical index of alteration (CIA) and the chemical index of weathering (CIW) recorded in the Cryogenian to Ediacaran sedimentary rocks of the Cathaysia Block, South China, indicate two cooling events. In combination with available age constraints, this data suggests correlation with the global Marinoan (ca. 650–635?Ma) and Gaskiers (ca. 579?Ma) glaciations. U-Pb ages of detrital zircons from the Cryogenian to lower Ediacaran strata define two distinctive age peaks at 1056?Ma and 998?Ma, whereas the upper Ediacaran strata show only one age peak at 957?Ma. These data demonstrate Neoproterozoic sedimentary rocks in the Cathaysia Block were derived from a source external to the craton. The predominant late Mesoproterozoic to early Neoproterozoic (1140–870?Ma) detrital zircons were most likely derived from a source dominated by North India and East Antarctica with limited input from Western Australia. Furthermore, εHf(t) values of detrital zircons are similar to the coeval detrital zircons from Rayner-Eastern Ghats. The detrital record of the late Cryogenian and Ediacaran strata in the Cathaysia Block suggests that the South China Block was connected to the northern margin of India during the dispersal of Rodinia and the assembly of East Gondwana. Detrital zircons from Cryogenian strata overlying the Jiangnan Orogen are largely in the range 900–700?Ma with scattered Archean and Paleoproterozoic grains. These ages are consistent with derivation from local sources within South China. The timing of accumulation of these units, after collisional assembly of South China, likely accounts for their more restricted provenance with collision generated relief providing both a local source and restricting input from further south within India and/or the rest of Gondwana.
机译：南方的Neoproterozoic古地理拍摄在罗西尼亚的形成，它的分手和随后的Gondwana融合来主导。在南方华南地区的埃德基拉邦沉积物中记录的改变（CIA）化学指标和耐候化学指数的两种负面偏移和耐候（CIW）的化学指标表示两个冷却事件。结合可用年龄约束，该数据表明与全球Marinoan（CA.650-635？MA）和汽油（约579？MA）冰川的相关性。来自低温锆的U-PB毒性Zircons从低温尼替氏菌中达到埃迪亚胺地层定义了两个独特的年龄峰在1056？ma和998？ma，而上埃德加伦地层仅在957℃下显示一个年龄峰值。这些数据展示了正规期群中的NeoProterozoic沉积岩源自Craton外部的源。优势晚期的月经古代（1140-870？MA）邪恶的锆石最有可能从北印度和东南南极洲占主导地位的来源，其中来自西澳大利亚有限。此外，扭转锆石的εHF（t）值类似于来自Rayner-Eastern Ghats的Coeval碎屑Zircons。晚安区的后期低温和埃德加伦地层的堕胎记录表明，南中国街区在罗迪尼亚散席期间与印度的北部边缘相连，以及东峡湾大会。来自江南orgen的低温子地层的滴乳锆石主要位于900-700的范围内，散落的Archean和古邦古代谷物。这些年龄符合来自华南内的当地来源的推导。这些单位的积累时间在南方群体组合之后，可能会在碰撞中占据其更多限制的出处，并在印度和地区的南部的进一步南部限制进一步南部的救济。

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  • 来源
    《Precambrian Research》 |2018年第2018期|共16页
  • 作者

    Liang Qi; Yajun Xu; Peter A. Cawood; Yuansheng Du;

  • 作者单位

    State Key Laboratory of Geological Processes and Mineral Resources Center for Global Tectonics School of Earth Sciences China University of Geosciences;

    State Key Laboratory of Geological Processes and Mineral Resources Center for Global Tectonics School of Earth Sciences China University of Geosciences;

    School of Earth Atmosphere &

    Environment Monash University;

    State Key Laboratory of Geological Processes and Mineral Resources Center for Global Tectonics School of Earth Sciences China University of Geosciences;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 前寒武纪;
  • 关键词

    South China; Neoproterozoic; Rodinia; Gondwana; Detrital zircon; North India;

    机译：南方;新蛋白质;罗迪尼亚;Gondwana;Detrital Zircon;北印度;

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