Controls on the Paleogene carbonate platform growth under greenhouse climate conditions (Offshore Indus Basin)
Controls on the Paleogene carbonate platform growth under greenhouse climate conditions (Offshore Indus Basin)
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温室气候条件下古近纪碳酸盐台地生长的控制（近海印度河盆地）
DOI：
10.1016/j.marpetgeo.2018.12.025
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发表时间：
2019
影响因子：
4.2
通讯作者：
Qayyum
中科院分区：
文献类型：
--
作者：
Shahzad;Betzler;Qayyum
古新世-始新世时期，印度板块西部大陆边缘是一个以广泛的附着和孤立的碳酸盐台地为特征的赤道省。利用高分辨率地震资料，结合沉积学资料和对数母图，研究了这些孤立的碳酸盐岩台地的地层演化、形态特征和分布，这些台地位于北东-西向基底高地和与r<s:1> union热点迹线相连的火山脊上。地震地层学允许在台地序列中定义7个地震单元。表明沉积阶段和大规模后退阶段的地层堆积模式与解释为表明重复的再现阶段的层位交替。台地生长的开始和台地的进一步发育主要受德干火山活动后的沉降和嘉士伯岭的张开控制。剖面上台地不对称，东部积层边缘为上风，西部积层边缘为背风。背风缘随着时间的推移而后退，表现为基底断裂对构造的改造。断块运动对地台内部几何形状和相分布也有一定影响。沉降速率的变化可能加速了早始新世至中始新世期间海平面的相对上升，从而导致了孤立的碳酸盐台地的消亡。孤立的碳酸盐岩台地在地层年龄上相当于同时期碳酸盐岩陆架的拉基-加济基岩石地层单元。据我们所知，该碳酸盐体系是古新世-始新世期间最著名的温室碳酸盐体系的地震尺度例子。
During the Paleocene and Eocene, the western continental margin of the Indian Plate was an equatorial province characterized by widespread attached and isolated carbonate platforms. Using high-resolution seismic data combined with sedimentological data and log-motifs, this study presents the stratigraphic evolution, the morphological features, and the distributions of these isolated carbonate platforms which are located on NE-SW oriented basement highs and volcanic ridges linked to the Réunion Hotspot trace. Seismic stratigraphy allows defining seven seismic units in the platform succession. Stratal stacking patterns indicative of phases of aggradation and of large-scale backstepping alternate with horizons interpreted to indicate repeated phases of emersion. The onset of platform growth and the further platform development were mainly controlled by the subsidence following the Deccan Volcanism and the opening of Carlsberg Ridge. Platforms are asymmetrical in the section with the eastern aggrading margins interpreted as windward and the western margins as leeward. The leeward margins, which through time stepped back appear as structurally modified by basement induced faults. Fault blocks movement also partially influenced the internal platform geometries and the facies distribution. Change in the rate of subsidence possibly augmented the relative sea-level rise during the Early to Middle Eocene and hence contributed to the demise of the isolated carbonate platforms. Isolated carbonate platforms are stratigraphically age-equivalent to the Laki-Ghazij lithostratigraphic unit of the contemporaneous carbonate shelf. As per our knowledge, this carbonate system is the best-known seismic scale example of greenhouse carbonate system thriving during the Paleocene –Eocene.
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