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Deconstructing South China and consequences for reconstructing Nuna and Rodinia
Earth-Science Reviews ( IF 12.1 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.earscirev.2020.103169
Peter A. Cawood , Wei Wang , Tianyu Zhao , Yajun Xu , Jacob A. Mulder , Sergei A. Pisarevsky , Limin Zhang , Chengshi Gan , Huiying He , Huichuan Liu , Liang Qi , Yuejun Wang , Jinlong Yao , Guochun Zhao , Mei-Fu Zhou , Jian-Wei Zi

Abstract Contrasting models for internal and external locations of South China within the Nuna and Rodinia supercontinents can be resolved when the current lithotectonic associations of Mesoproterozoic and older rocks units that constitute the craton are redefined into four lithotectonic domains: Kongling, Kunming-Hainan, Wuyi, and Coastal. The Kongling and Kunming-Hainan domains are characterized by isolated Archean to early Paleoproterozoic rock units and events and crop out in northern and southern South China, respectively. The Kunming-Hainan Domain is preserved in three spatially separated regions at Kunming (southwestern South China), along the Ailaoshan shear zone, and within Hainan Island. Both domains were affected by late Paleoproterozoic tectonothermal events, indicating their likely juxtaposition by this time to form the proto-Yangtze Block. Late Paleoproterozoic and Mesoproterozoic sedimentary and igneous rock units developed on the proto-Yangtze Block, especially in its southern portions, and help link the rock units that formed along the shear zone at Ailaoshan and on Hainan Island into a single, spatially unified unit prior to Paleozoic to Cenozoic structural disaggregation and translation. The Wuyi Domain consists of late Paleoproterozoic rock units within a NE-SW trending, fault-bounded block in eastern South China. The Coastal Domain lies east of the Wuyi domain and is inferred to constitute a structurally separate block. Basement to the domain is not exposed, but zircon Hf model ages from Mesozoic granites suggest Mesoproterozoic basement at depth. The Archean to Paleoproterozoic tectonothermal record of the Kongling and Kunming-Hainan domains corresponds closely with that of NW Laurentia, suggesting all were linked, probably in association with assembly and subsequent partial fragmentation of the Nuna supercontinent. Furthermore, the age and character of Mesoproterozoic magmatism and detrital zircon signature of sedimentary rocks in the proto-Yangtze Block matches well with western Laurentia and eastern Australia-Antarctica. In particular, the detrital zircon signature of late Paleoproterozoic to early Mesoproterozoic sedimentary units in the block (e.g. Dongchuan Group) share a similar age spectrum with the Wernecke Supergroup of northwest Laurentia. This, together with similarities in the type and age of Fe-Cu mineralization in the domain with that in eastern Australia-Antarctica, especially northeast Australia, suggests a location adjacent to northwest Laurentia, southern Siberia, and northeast Australia within the Nuna supercontinent. The timing and character of late Paleoproterozoic magmatic activity in the Wuyi domain along with age of detrital zircons in associated sedimentary rocks matches the record of northern India. During rifting between Australia–Antarctica and Laurentia in the late Mesoproterozoic, the proto-Yangtze Block remained linked to northeast Australia. During accretionary orogenesis in the early Neoproterozoic, the proto-Yangtze Block assembled with the Wuyi Domain along the northern margin of India. The Coastal domain likely accreted at this time forming the South China Craton. Displacement of the Hainan and Ailaoshan assemblages from southwest of the Kunming assemblage likely occurred in the Cenozoic with the activation of the Ailaoshan-Red River fault system but could have begun in the early to mid-Paleozoic based on evidence for tectonothermal events in the Hainan assemblage.

中文翻译:

解构华南和重建努娜和罗迪尼亚的后果

摘要 当构成克拉通的中元古代和较古老岩石单元的当前岩石构造组合重新定义为四个岩石构造域时,可以解决华南在努纳和罗迪尼亚超大陆内部和外部位置的对比模型:孔岭、昆明-海南、武夷、和沿海。孔岭和昆明-海南域的特征是孤立的太古代至早古元古代岩石单元和事件,分别出现在华北和华南南部。昆明-海南域保存在昆明(华南西南部)、哀牢山剪切带沿线和海南岛内三个空间分离的区域中。两个域都受到晚古元古代构造热事件的影响,表明此时它们可能并置以形成原始长江地块。早古元古代和中元古代沉积岩和火成岩单元发育在原长江地块,特别是其南部,有助于将哀牢山剪切带和海南岛沿线形成的岩石单元连接成一个单一的、空间统一的单元。古生代到新生代的结构分解和转换。武夷域由位于华南东部一个 NE-SW 向断层边界地块内的晚古元古代岩石单元组成。海岸域位于武夷域以东,推测构成一个构造上独立的区块。该域的基底未出露,但中生代花岗岩的锆石 Hf 模型年龄表明中元古代基底在深处。孔岭和昆明-海南域的太古宙至古元古代构造热记录与劳伦大陆西北部的记录密切对应,表明它们都相互关联,可能与努纳超大陆的组装和随后的部分破碎有关。此外,原长江地块沉积岩的中元古代岩浆作用和碎屑锆石特征与劳伦西亚西部和澳大利亚-南极东部相吻合。特别是,该地块(如东川群)晚古元古代至早中元古代沉积单元的碎屑锆石特征与劳伦西亚西北部的韦内克超群具有相似的年龄谱。再加上该区域与澳大利亚东部-南极洲的铁铜矿化类型和年龄的相似性,尤其是澳大利亚东北部,暗示了在努纳超大陆内与劳伦西亚西北部、西伯利亚南部和澳大利亚东北部相邻的位置。武夷域晚古元古代岩浆活动的时间和特征以及伴生沉积岩中碎屑锆石的年龄与印度北部的记录相吻合。在中元古代晚期澳大利亚-南极和劳伦大陆之间的裂谷期间,原长江地块仍与澳大利亚东北部相连。在新元古代早期增生造山作用中,原长江地块与印度北缘的武夷域汇合。沿海地区可能在此时增生形成华南克拉通。
更新日期:2020-05-01
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