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首页> 中文期刊> 《大地构造与成矿学》 >越南Song Da带前新生代构造属性及构造背景分析

越南Song Da带前新生代构造属性及构造背景分析

         
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通过越南西北部Song Da带地层、构造、变质岩和岩浆岩的野外考察及补充填图，依据岩石组合特征和区域不整合，将Song Da带前新生代地层划分为前震旦纪结晶基底、寒武系-上三叠统下部及上三叠统上部-白垩系3个构造层。在对各构造层构造属性分析的基础上，与扬子-华南板块前新生代地层进行区域对比，结果显示， Song Da 带前新生代各构造层与扬子-华南板块具有相似性，表明 Song Da带属于扬子-华南板块。此外，对研究区各构造层形成的构造背景进行分析，认为它们分别是在Columbia超大陆的形成和Rodinia超大陆的裂解、稳定地台盖层的沉积、古特提斯洋关闭以及古太平洋板块向欧亚大陆边缘俯冲的背景下形成的。同时认为， Song Da 带向海域的延伸部分--莺歌海盆地基底与Song Da带具有相同的前新生代基底构造层、构造属性和构造背景。%Rock association and regional unconformity are identified based on field survey and mapping for the stratigraphy, tectonics, metamorphic rock and igneous rocks in the Song Da zone, the northwestern Vietnam. Pre-Cenozoic in the Song Da zone is divided into three structural layers:(1) the Presinian crystalline basement, (2) the Cambrian-lower part of Upper Triassic, and (3) the upper part of Upper Triassic-Cretaceous. The Pre-Cenozoic structural successions of the Song Da zone show similar features with those of the Yangtze-South China plate:(1) In the Presinian, both of them have TTG complex and Khondalite series of similar ages and experienced similar tectonic evolution; (2) In the Cambrian-early Upper Triassic, the phosphorite and thick-layered limestone are comparable, and the Permian-Triassic basalt in the Song Da zone has genetic mechanism similar to that of the Emeishan basa(3) In the late Upper Triassic-Cretaceous, the volcanic-sedimentary faulted basins and thick continental red beds are comparable to those in East China. It can be concluded that the Song Da zone should have been part of the southwestern Yangtze-South China plate, and the boundary between the Yangtze-South China plate and Indochina plate is the Song Ma suture zone which contains ophiolite remnants. Tectonic settings of different structural layers indicate that the Song Da Zone experienced geological events such as the Columbia and Rodinia Supercontinent, sedimentation of the stable platform cover, closure of the Paleo-Tethys, and NW subduction of the Paleo-Pacific plate to the Eurasian plate. The Pre-Cenozoic basement of the Yinggehai Basin is the seaward extension of the Song Da zone, which shows similar tectonic features.

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