Characteristics of contourites in the Lower Silurian in southeastern Sichuan Basin,China
QIAO Dan1,2, SHI Zhiqiang1,2, ZHANG Xiang1,2, LI Changhao1,2
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China; 2 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China
Abstract Modern marine geological surveys show that there are contourites along the slopes of carbonate platforms. However,it is difficult to identify contourite drifts preserved in the strata. In this study,we document contourites from the Lower Silurian Xiaoheba and Shiniulan Formations in the southeastern Sichuan Basin based on the field investigation and microscopic observation. Symmetrical graded beddings and banded structures with periodic variations are found from the Xiaoheba Formation at such sections as Sanquan in Nanchuan County,Jinzhu in Shizhu County,Huangcaochang in Wulong County. Nodular limestones and argillaceous strip-banded limestones are developed in the lower Shiniulan Formation,while thin-bedded sandstones are found in the upper Shiniulan Formation at Baiyangshu and Podu sections in Tongzi County. Compared with modern carbonate platforms at Bahama and Maldivian,and with consider of the typical deep-water isobathic sedimentary features,it is suggested that contourites predominate the sandstones of Xiaoheba Formation. Likewise,the thin-bedded sandstones yielding from the upper Shiniulan Formation might be the contourites controlled by periodic changes of sea level. Meanwhile,the striped limestones in the lower Shiniulan Formation are recognized as the deposits controlled by tractive current(i.e.,contour current). This study provides an actualistic example for ancient contourites which might enhance our understanding of the Lower Silurian palaeogeographic evolution and of oil/gas reservoirs in the southeastern Sichuan Basin.
Fund:Co-funded by the Sichuan Science and Technology Project(No.2021YJ0353)and the National Natural Science Foundation of China(No.41272131)
Corresponding Authors:
SHI Zhiqiang,born in 1972,received a Ph.D. degree from the Chengdu University of Technology and is now a professor at the Institute of Sedimentary Geology,Chengdu University of Technology. He is currently engaged in event sedimentology and petroleum geology. E-mail: szqcdut@163.com.
About author: QIAO Dan,born in 1995,is a doctoral candidate in sedimentology at Chengdu University of Technology. E-mail: jilin8819636@163.com.第一作者简介 乔丹,男,<italic>1995</italic>年生,成都理工大学沉积地质研究院博士研究生。<italic>E-mail</italic>: jilin8819636@163.com。
Cite this article:
QIAO Dan,SHI Zhiqiang,ZHANG Xiang et al. Characteristics of contourites in the Lower Silurian in southeastern Sichuan Basin,China[J]. JOPC, 2023, 25(4): 856-871.
QIAO Dan,SHI Zhiqiang,ZHANG Xiang et al. Characteristics of contourites in the Lower Silurian in southeastern Sichuan Basin,China[J]. JOPC, 2023, 25(4): 856-871.
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