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首页> 外文期刊>International Geology Review >Ediacaran (Sinian) palaeogeographic reconstruction of the Upper Yangtze area, China, and its tectonic implications
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Ediacaran (Sinian) palaeogeographic reconstruction of the Upper Yangtze area, China, and its tectonic implications

机译：埃德加伦（SINIAN）中国上长江地区的古地理重建及其构造含义

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摘要

The Ediacaran (ca. 635-541 Ma) was a critical period in Earth history, which saw a dramatic transformation in global biological, chemical and climatic conditions, making it one of the most intensively investigated time intervals worldwide. As the first mixed clastic-carbonate succession deposited on the Upper Yangtze Craton, the Ediacaran succession overlies Neoproterozoic continental rifts, and records a complex basin infill history. In this study, we focus on the tectonostratigraphic environment and basin infill process, integrating multiple data sets, including boreholes, outcrops, well correlations, seismic data, isopach maps and the spatial distribution of sedimentary facies. The Ediacaran System includes the Doushantuo Formation and overlying Dengying Formation which can be subdivided into four lithostratigraphic members (D1-D4). The Doushantuo Formation and D3 Member consist of mixed clastic-carbonate sediments, while carbonates predominate in the D1, D2 and D4 members. Intracratonic depressions and continental margin rifts dominated the Upper Yangtze area during the Ediacaran. During deposition of the Doushantuo Formation, the Upper Yangtze area contained a variety of environments, including terrigenous shorefaces, mixed tidal flats, lagoons, shelves, slopes and bathyal seas. A rimmed carbonate platform developed during deposition of the D1 and D2 members. The Deyang-Anyue Trough, which is related to post-rift subsidence in the intracratonic basin, began to develop in this interval. A relatively intense extension during deposition of the D3 Member resulted in intensification of intracratonic and continental margin rifting, creating distinct tidal flat, deep-water shelf, slope and bathyal environments. With the expansion of the Deyang-Anyue Trough during deposition of the D4 Member, the rimmed carbonate platform was divided into two segments. We suggest that the Deyang-Anyue Trough was a structurally controlled intracratonic rift-sag and likely arose from multiple episodes of rifting in the cratonic basement, as well as differential uplifting and exposure caused by the ongoing Tongwan Movement. Our model highlights the role of basement heritage on the structure and evolution of intracratonic rift-sag.
机译：EdiaCaran（约635-541 mA）是地球历史的关键时期，它在全球生物，化学和气候条件下显着改变，使其成为全球最强烈的调查时间间隔之一。作为沉积在上长江上部的第一种混合碎屑 - 碳酸酯连续，埃德拉甘山继承覆盖着NeoProterozoic Continental Rifts，并记录复杂的盆地填充历史。在这项研究中，我们专注于构造的数据库环境和盆地填充过程，整合多个数据集，包括钻孔，露头，井相关性，地震数据，ISopach地图以及沉积相的空间分布。埃德拉甘系统包括DOUSHANTUO形成和覆盖的垂直形成，可以细分为四个岩石岩石术成员（D1-D4）。 DOUSHANTUO形成和D3构件包括混合碎屑 - 碳酸盐沉积物，而碳酸盐占D1，D2和D4成员。在埃迪克兰人期间，英勇的凹陷和大陆边缘裂缝占据了上扬子地区。在沉积Doushantuo地层期间，上扬子地区含有各种环境，包括堆积架，混合潮流，泻湖，搁板，搁板，山坡和浴袍。在D1和D2成员沉积期间开发的镶边碳酸盐平台。德阳腹水槽，与在腹腔盆地的裂口后沉降相关，开始在这种间隔开发。在D3成员沉积期间相对强烈的延伸导致跨读力和大陆边缘散步，产生明显的潮汐平，深水架，坡度和浴形环境。随着Deyang-antue槽的膨胀在D4成员的沉积期间，将边缘碳酸盐平台分成两个段。我们建议德阳 - 任何槽都是一种结构上控制的颈腹裂缝，并且可能从裂缝地下室中的河流的多次发作产生，以及由正在进行的跨国运动引起的差动振奋和暴露。我们的模型凸显了地下室遗产对颈腹裂缝的结构和演变的作用。

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