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Integrated Cretaceous stratigraphy of the Cauvery Basin, South India

机译：南印度南部Cauvery盆地的集成白垩纪地层

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摘要

Cretaceous sequences of the Cauvery Basin, South India, can serve as an analogue to understand the subsurface successions with proven potential for commercial hydrocarbon exploration. In this area, the distribution of hydrocarbon reservoir and source rock facies was profoundly influenced by relative sea level changes amplified by rifting and related tectonic activities. Of particular interest are the sedimentary strata exposed in mines, quarries and outcrops around the Ariyalur area of Tamil Nadu, that mirror subsurface strata. This study reviews and integrates the stratigraphic studies based on this area and published over the past three decades. In particular, we concentrate on lithological features, macrofossils, microfossils, ichnofossils, magnetic polarity and sequence stratigraphy to reveal the geologic history of the Cauvery Basin. Age control, paleoenvironmental interpretations, paleobathymetry, paleoecology and paleotemperature are based on ammonites, belemnites, brachiopods, mollusks, nannofossils, and foraminifera. Key results include an integrated stratigraphic framework, paleobathymetry and sea level history that shows seven second/third-order depositional sequences, and major sea level falls during the late Turonian and late Maastrichtian linked to the Marion and Reunion mantle plumes, respectively.
机译：Cauvery盆地，南印度的白垩纪序列可以作为类似的模拟，了解商业碳氢化合物勘探的潜力。在该领域，烃储层和源岩面的分布受到通过河流和相关构造活动放大的相对海平变化的深刻影响。特别感兴趣的是在泰米尔纳德邦的Ariyalur面积周围地雷，采石场和露头暴露的沉积地层，镜子地下地层。这项研究和整合了基于该领域的地层研究，并在过去的三十年中发表。特别是，我们专注于岩性特征，大甲酰胺，微泡沫，Ichnofossils，磁极性和序列地层，揭示了Cauvery盆地的地质历史。年龄控制，古道环境解释，古地质术，古生态学和古温度都是基于氨化，Belemnites，Brachiopods，软体动物，Nannofossils和foraminifera。关键结果包括集成的地层框架，古地质运动和海平面历史，显示七次/三阶沉积序列，主要的海平面，分别在延迟的地图中落下了与马里昂和团聚披风羽毛的后期马斯特里亚山脉。

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