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首页> 外文期刊>Journal of Asian earth sciences >Foraminiferal biostratigraphy and sequence stratigraphy of peritidal carbonates at the Triassic-Jurassic boundary (Karaburun Peninsula, Western Turkey)
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Foraminiferal biostratigraphy and sequence stratigraphy of peritidal carbonates at the Triassic-Jurassic boundary (Karaburun Peninsula, Western Turkey)

机译：三叠纪-侏罗纪边界（卡拉布伦半岛，土耳其西部）有孔碳酸盐岩的有孔虫生物地层学和层序地层学

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摘要

Continuous shallow marine carbonates spanning the Triassic-Jurassic boundary are exposed in the Karaburun Peninsula, Western Turkey. The studied section (Tahtaiskele section) consists of Upper Triassic cyclic shallow marine carbonates intercalated with clastics overlain by Lower Liassic carbonates. Based on the microfacies stacking patterns, three main types of shallowing-upward cycles have been recognized. Cycles are mostly composed of subtidal facies at the bottom, intertidal/supratidal facies and/or subaerial exposure structures at the top. The duration of the cycles suggests that cycles were driven by the precessional Milankovitch rhytmicity. In the sequence stratigraphic frame of the Tahtaiskele section 4 sequence boundaries were detected and globally correlated. The first sequence boundary is located at the Alaunian-Sevatian boundary nearly coinciding with the first appearance of Triasina hantkeni. The second falls in the Rhaetian corresponding to a major sea level fall which led to the invasion of forced regressive siliciclastic deposits over the peritidal carbonates. The third occurs close to the T/J boundary and the fourth lies slightly above the base of the Jurassic. In the studied section, extinction, survival and recovery intervals have been recognized based on the stratigraphic occurrence patterns of benthic foraminifera and algae. Foraminifers became nearly totally extinct in the inner carbonate shelves at the Triassic-Jurassic boundary and an interval of approximately 0.5 my passed before the begining of the recovery of Jurassic foraminifera.
机译：跨越三叠纪-侏罗纪边界的连续浅海碳酸盐在土耳其西部的卡拉布伦半岛暴露。研究区（Tahtaiskele剖面）由上三叠统环状浅海相碳酸盐组成，并插有碎屑，下层为低碳酸盐碳酸盐。基于微相堆积模式，已经认识到三种主要的浅变向上周期。周期主要由底部的潮下带相，顶部的潮间带/上生相和/或空中暴露结构组成。周期的持续时间表明，周期由进动的米兰科维奇韵律驱动。在Tahtaiskele部分的层序地层框架中，检测到了4个层序边界并进行了整体关联。第一个序列边界位于Alaunian-Sevatian边界，几乎与Triasina hantkeni的首次出现相吻合。在Rhaetian的第二次下降对应于主要的海平面下降，这导致了侵入性碳酸盐岩上强迫退化的硅质碎屑岩侵入。第三个位于T / J边界附近，第四个位于侏罗纪底部稍上方。在研究的部分中，已根据底栖有孔虫和藻类的地层发生模式认识到了灭绝，生存和恢复间隔。有孔虫在三叠纪-侏罗纪边界的内部碳酸盐层架中几乎完全灭绝，在开始侏罗纪有孔虫的恢复之前经过了大约0.5毫秒的间隔。

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