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首页> 外文期刊>Facies >Upper Triassic (Ladinian?-Carnian) reef biota from the Sambosan Accretionary Complex, Shikoku, Japan
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Upper Triassic (Ladinian?-Carnian) reef biota from the Sambosan Accretionary Complex, Shikoku, Japan

机译：日本四国三宝山增生群中的上三叠世（拉第尼？

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摘要

The Middle and Late Triassic was a time of important reef development. This evolution, which is primarily documented in the Tethys realm, comprised several phases from the Anisian to the Rhaetian. To help elucidate the less constrained reef evolution in the Panthalassa domain, samples of reef limestone were collected from several localities along the Sambosan Accretionary Complex in Shikoku Island, southwest Japan. In this paper, we report a well-preserved and comprehensive reef biota, including several taxonomic groups, such as scleractinian corals, calcified sponges, calcareous algae, foraminifers, and microproblematica. Seventeen species are described for the first time in Japan among the 33 that are identified in this study. The assemblage-based biostratigraphy and index taxa indicate a Ladinian?-Carnian age. This new finding corresponds to an older reef limestone than has been previously identified in the Sambosan Accretionary Complex and may represent the initiation of shallow-water carbonate deposition on western Panthalassa seamounts. This work also provides valuable insights on reef ecosystem biodiversity in the Panthalassa domain during the Middle? to Late Triassic.
机译：三叠纪中晚期是重要的珊瑚礁发展时期。这种演变主要记录在Tethys领域，包括从Anisian到Rhaetian的几个阶段。为了帮助阐明Panthalassa域中受限制较小的珊瑚礁演化，从日本西南部四国岛Sambosan增生复合体的几个地方收集了珊瑚礁石灰石样品。在本文中，我们报告了保存完好的综合珊瑚礁生物区系，其中包括几个分类学类别，例如巩膜珊瑚，钙化海绵，钙质藻类，有孔虫和微问题。在本研究中确定的33种物种中，日本首次描述了17种。基于组合的生物地层学和索引分类单元表明了拉丁尼时代-卡纳时代。这一新发现对应的珊瑚礁石灰石比之前在Sambosan增生综合体中发现的礁石石灰岩还旧，并且可能代表了Panthalassa西部海山上浅水碳酸盐沉积的开始。这项工作还提供了有关Panthalassa地区中段珊瑚礁生态系统生物多样性的宝贵见解。到晚三叠纪。

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