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首页> 外文期刊>Geochemistry, geophysics, geosystems >Improving shallow-water carbonate chemostratigraphy by means of rudist bivalve sclerochemistry
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Improving shallow-water carbonate chemostratigraphy by means of rudist bivalve sclerochemistry

机译：通过利氏双瓣膜硬化化学法改善浅水碳酸盐化学地层学

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摘要

Deep-time shallow-marine carbonate platforms record distinct biotic responses to climatic and environmental stressors. Unfortunately, precise temporal assignment of these biotic responses is often problematical due to poor biostratigraphic control and/or a significant diagenetic overprint of the neritic bulk carbonate chemostratigraphic inventory. An accurate stratigraphic framework is essential to better understand the causal relation between biotic events recorded by carbonate platforms and environmental changes that, for instance, culminated in mass extinction events or prolonged episodes of oceanic anoxia. Here we provide an integrated carbon and strontium-isotope stratigraphy of the Early Cretaceous subtropical Provence carbonate platform in SE France that is based solely on pristine low-Mg calcite from rudist bivalves. Carbon-isotope data of geochemically screened rudist fragments enabled reconstruction of a characteristic Barremian pattern including the Mid-Barremian Event (MBE) that allowed for a precise correlation with stratigraphically well-constrained Tethyan shallow-water and hemipelagic reference sections. In order to evaluate ontogenetic carbon-isotope changes and the overall variability of the shell-derived carbon-isotope data, numerous sclerochronological carbon-isotope profiles of individual large rudist shells are presented. Strontium-isotope stratigraphy supports the carbon-isotope-based age of the studied sections, but also provides unequivocal evidence for a major hiatus in the depositional record covering large parts of the Late Barremian. In contrast to biostratigraphic and bulk carbonate chemostratigraphic archives, the here established chronostratigraphy of carbonate platform evolution in the southern Provence region demonstrates a twofold resurgence of rudist-rich carbonate platform production during the Early Aptian and arguably the latest Early Aptian.
机译：深度浅海碳酸盐台地记录了对气候和环境压力源的独特生物响应。不幸的是，由于不良的生物地层控制和/或大量的碳酸盐岩地热化学地层图成岩作用叠加，这些生物反应的精确时间分配常常是成问题的。准确的地层学框架对于更好地理解碳酸盐平台记录的生物事件与环境变化之间的因果关系至关重要，例如，这些变化最终导致大规模灭绝事件或长时间的海洋缺氧事件。在这里，我们提供了法国东南部早白垩世亚热带普罗旺斯碳酸盐岩台地的碳和锶-同位素综合地层学，该地层仅基于红双壳贝类的原始低镁方解石。通过地球化学筛选的鲁迪斯碎片的碳同位素数据，可以重建包括中巴里米亚事件（MBE）在内的典型巴里米亚模式，该模式可以与地层良好约束的特提斯浅水区和半流质参考剖面精确关联。为了评估个体发育的碳同位素变化和壳派生的碳同位素数据的总体变异性，提出了各个大鲁迪斯壳的大量年代学碳同位素轮廓。锶同位素地层学支持了所研究断面的碳同位素年龄，但也为沉积记录中的一个大裂隙提供了明确的证据，该记录涵盖了巴雷米亚晚期。与生物地层和整体碳酸盐化学地层学档案形成对比，普罗旺斯南部地区碳酸盐台地演化的年代地层学表明，在阿普特早期（可以说是最新的阿普特早期），富斯图尔斯碳酸盐台地的生产有两次复苏。

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