Locating South China in Rodinia and Gondwana: A fragment of greater India lithosphere?
Locating South China in Rodinia and Gondwana: A fragment of greater India lithosphere?
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DOI：
10.1130/g34395.1
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发表时间：
2013-08
期刊：
影响因子：
5.8
通讯作者：
Peter A. Cawood;Yuejun Wang;Ya-jun Xu;Guochun Zhao
中科院分区：
文献类型：
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作者：
Peter A. Cawood;Yuejun Wang;Ya-jun Xu;Guochun Zhao
从中元古代末期Rodinia的形成到古生代末期盘古大陆裂解开始，华南克拉通首先形成，然后占据了与西澳大利亚和北方印度相邻的位置。克拉通范围内新元古代早期俯冲带岩浆弧-弧后组合。1000 ~ 820 Ma，呈北西向递减。这些关系表明弧系统的形成和关闭，通过东南向俯冲，导致逐步西北加积到一个已经组装Rodinia的外围。早古生代海侵克拉通的硅质碎屑岩单元来自东南部，包括克拉通当前界限以外的碎屑。碎屑锆石年龄谱需要东冈瓦纳来源，是非常相似的特提斯喜马拉雅和年轻的古生代继承从西澳大利亚州，建议从一个共同的来源和推断积累在连接的盆地沿着冈瓦纳北方边缘，这种情况下，一直持续到裂谷和破碎的克拉通在晚古生代。
From the formation of Rodinia at the end of the Mesoproterozoic to the commencement of Pangea breakup at the end of the Paleozoic, the South China craton fi rst formed and then occupied a position adjacent to Western Australia and northern India. Early Neoproterozoic suprasubduction zone magmatic arc-backarc assemblages in the craton range in age from ca. 1000 Ma to 820 Ma and display a sequential northwest decrease in age. These relations suggest formation and closure of arc systems through southeast-directed subduction, resulting in progressive northwestward accretion onto the periphery of an already assembled Rodinia. Siliciclastic units within an early Paleozoic succession that transgresses across the craton were derived from the southeast and include detritus from beyond the current limits of the craton. Detrital zircon age spectra require an East Gondwana source and are very similar to the Tethyan Himalaya and younger Paleozoic successions from Western Australia, suggesting derivation from a common source and by inference accumulation in linked basins along the northern margin of Gondwana, a situation that continued until rifting and breakup of the craton in the late Paleozoic.