Petroleum Science >2016,??Issue 4:??657-668 DOI: https://doi.org/10.1007/s12182-016-0125-2
Formation mechanisms and sequence response of authigenic grain-coating chlorite: evidence from the Upper Triassic Xujiahe Formation in the southern Sichuan Basin, China Open?Access
文章信息
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China
文章摘要
microfacies, including underwater distributary channels, distributary channels, shallow lake sandstone dams, and mouth bars. Chlorite had a tendency to form in the upper parts of sandstone bodies with signs of increased base level, representing the influence of marine (lacustrine) transgression. This is believed to be influenced by megamonsoons in the Middle and Upper Yangtze Region during
the Late Triassic Epoch. During periods of abundant precipitation, river discharges increased and more Fe particulates flowed into the ocean (lake). In the meantime, increases or decreases in lake level were only affected by precipitation for short periods of time. The sedimentary environment shifted from weakly oxidizing to weak alkaline, weakly reducing conditions as sea level increased, and
Fe-rich minerals as authigenic chlorite and glauconite began to form and deposit.
關鍵詞
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Sichuan Basin · Xujiahe Formation · Graincoatingchlorite · Glauconite Pyrite