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首页> 外文期刊>Facies >Mid-oceanic shallow-water carbonates of the Panthalassa domain: new microfacies data from the Sambosan Accretionary Complex, Shikoku Island, Japan
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Mid-oceanic shallow-water carbonates of the Panthalassa domain: new microfacies data from the Sambosan Accretionary Complex, Shikoku Island, Japan

机译：Panthalassa域的中洋浅水碳酸盐：日本四国岛三宝山增生复合体的新微相数据

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摘要

During the Late Triassic, carbonate platforms expanded on continental shelves and island arcs. They have been studied in detail in the Tethys realm but coeval mid-oceanic shallow-water environments of the Panthalassa domain have received less attention. To fill this gap, we investigated the Upper Triassic limestone of the Sambosan Accretionary Complex (SAC), southwest Japan. A comprehensive sampling of the Upper Triassic limestone has been performed in 16 localities at Shikoku Island. Eight microfacies, ranging from pelagic to lagoonal settings, were identified, including two microfacies that are described in the SAC for the first time. Quantitative microfacies analysis assesses the composition of the SAC limestone and its biostratigraphy is refined. Finally, a speculative depositional model of the SAC carbonate platforms is proposed based on modern and ancient analogues. Instead of a true atoll-type platform with well-defined facies belts as suggested by previous studies, this new model suggests that the typical Sambosan platform was more probably a carbonate bank with submerged margins and a mosaic of microfacies in the platform interior. Special attention is given to the factors that have probably controlled the carbonate sedimentation at the top of the seamount(s).
机译：在三叠纪晚期，碳酸盐岩台地在大陆架和岛弧上扩展。已经在特提斯（Tethys）领域对它们进行了详细研究，但Panthalassa域的中世纪中洋浅水环境受到的关注较少。为了填补这一空白，我们调查了日本西南部三宝山增生复合体（SAC）的上三叠统石灰岩。在四国岛的16个地区对上三叠统石灰岩进行了全面采样。确定了从上层到泻湖环境的八个微相，包括在SAC中首次描述的两个微相。定量微相分析评估了SAC石灰岩的组成及其生物地层。最后，基于现代和古代类似物，提出了SAC碳酸盐平台的推测性沉积模型。这个新模型表明，典型的Sambosan平台可能是碳酸盐岩堤岸，其边缘被淹没，并且在平台内部镶嵌有微相，而不是像以前的研究所建议的那样，是一个具有明确相带的真正的环礁型平台。特别注意可能控制了海山顶部碳酸盐沉积的因素。

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