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首页> 外文期刊>Basin research >Patterns of basin fill in Triassic turbidites of the Nanpanjiang basin: implications for regional tectonics and impacts on carbonate-platform evolution
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Patterns of basin fill in Triassic turbidites of the Nanpanjiang basin: implications for regional tectonics and impacts on carbonate-platform evolution

机译：南盘江盆地三叠纪浊积盆地充填模式：对区域构造的影响及其对碳酸盐岩台地演化的影响

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The Nanpanjiang Basin occurs in a key position for resolving controversies of basin tectonics and patterns of plate assembly at the junction between south China and Southeast Asian plates. Paleocurrent measurements indicate that siliciclastic turbidites in the basin were sourced by the Precambrian Jiangnan uplift to the northeast, the Precambrian Yunkai uplift to the southeast and the Triassic Songma suture to the south. Detrital zircon geochronology reveals Archean (2500 Ma), Paleoproterozoic (1800-1900 Ma), Neoproterozoic (900-1000 Ma) and Paleozoic (420-460 Ma) ages consistent with derivation from the Jiangnan and Yunkai uplifts. A large Permian-Triassic peak of 250 Ma is present in the southern basin and attenuates northward suggesting derivation from an arc developed along the Songma suture. Sandstone QFL compositions average 65/12/23% and plot in the recycled orogen field except for a few samples in the southern basin that fall in the dissected arc field. The compositions are consistent with derivation from Precambrian basement that includes orogenic complexes. In the southern basin, Middle Triassic turbidites contain greater lithics and feldspars and Lower Triassic turbidites have volcaniclastic composition consistent with derivation from a southerly arc. Our preferred interpretation is evolution from remnant basin to a large peripheral foreland with southward subduction and convergence with Indochina along the Songma suture. The previously proposed Dian-Qiong zone is not a suture as its map location places it within carbonate platforms bounded by identical stratigraphy. The Nan-Uttaradit zone is too distant to have provided voluminous siliciclastic flux to the basin. The Nanpanjiang Basin provides an example of the evolution of an exceptionally large foreland with far-field rejuvenation of Precambrian uplifts and carbonate platforms that were significantly influenced by siliciclastic flux. The timing and pattern of turbidite basin fill impacted platform evolution by enabling margin progradation in areas proximal to siliciclastic sources, whereas platforms distant from sources were driven to aggradation and extreme relief with large-scale gravitational sector collapse.
机译：南盘江盆地位于解决华南板块与东南亚板块交界处的盆地构造和板块组装模式争议的关键位置。古电流测量结果表明，盆地中的硅质碎屑浊积岩是由前寒武纪的江南隆起向东北，前寒武纪的云开隆起向东南和三叠纪的松马缝合线提供。碎屑锆石的年代学揭示了太古代（2500 Ma），古元古代（1800-1900 Ma），新元古代（900-1000 Ma）和古生界（420-460 Ma）的年龄与江南和云海隆升的推导一致。在南部盆地存在一个250 Ma的大二叠纪-三叠纪峰，向北衰减，这表明是沿松马缝合线形成的弧线的衍生。砂岩QFL组成平均为65/12/23％，并且在再生造山带田中成图，除了南部盆地中的一些弧形场中的一些样品外。组成与包括造山复合体的前寒武纪基底一致。在南部盆地，中三叠纪浊质岩含有较大的岩性和长石，而下三叠纪浊质岩的火山碎屑成分与来自南极弧的变化一致。我们的首选解释是从残余盆地向大范围前陆演化，向南俯冲，并沿松马缝合线与印度支那交汇。先前提出的滇琼地带不是缝合线，因为其地图位置将其置于以相同地层为边界的碳酸盐岩台地内。 Nan-Uttaradit区域距离太远，无法为盆地提供大量的硅质碎屑流。南盘江盆地提供了一个特别大的前陆演化的例子，前陆寒武纪隆起和碳酸盐岩台地的远场复兴使之受到硅质碎屑通量的显着影响。浊积盆地充填的时间和方式，通过在硅质碎屑源附近使边缘展布而影响了平台的演化，而远离源的平台则被驱动了凝集作用，并伴随着大的重力扇形坍塌而产生了极大的浮雕。

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