Sequence Stratigraphic Division of the Devonian Liujiang Formation Dominated by Silicalites in the Northeastern Part of the Dianqiangui Basin, South China

IF 3.5 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Yingjie ZHANG, Wenpan CEN, Yinglun QIN, Chenglong MA, Jiyu CHEN, Wenfang HUANG, Long WANG
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Abstract

Silicalites are extensively developed in the Liujiang Formation (Fm.) of the Frasnian in the Dianqiangui Basin and are often associated with carbonaceous shales. This stratigraphic combination represents a special sequence stratigraphy formed in special deep-water environments, which not only gives the shales unusual spatio-temporal distribution features, but also induces the shales in the Liujiang Fm. to frequently be rich in organic matter (OM). This study summarises the special deep-water sedimentary succession of the Liujiang Fm., which is mainly distributed around synsedimentary faults, as well as establishing the sequence stratigraphic frameworks of the Liujiang Fm. in the west–east and southwest–northeast directions. Under the sequence stratigraphic frameworks, the spatio-temporal distribution features of the organic-rich shales of the Liujiang Fm. and the regional variations of the Liujiang Fm. were investigated. In addition, the rock components and OM occurrence states of the organic-rich shales were also observed and described in detail under the microscope. The results show that the organic-rich shales were formed temporally primarily during the third-order sea-level falling stage, developed spatially mainly on the east and west sides of the study area, as well as that the OM accumulation is closely related to tentaculitoids and seems to be influenced by a ‘biological pump’.

Abstract Image

滇黔桂盆地东北部以硅质岩为主的泥盆系柳江组层序地层划分
硅质岩广泛发育于滇前桂盆地弗拉斯系柳江组,常与碳质页岩伴生。这种地层组合代表了在特殊深水环境下形成的特殊层序地层,不仅赋予了页岩不同寻常的时空分布特征,而且还诱发了柳江组页岩的形成。通常富含有机物(OM)。总结了柳江组特殊的深水沉积演替。主要分布在同沉积断裂周围,建立了柳江组层序地层格架。在西-东和西南-东北方向。在层序地层格架下,研究了柳江组富有机质页岩的时空分布特征。柳江Fm的区域差异。被调查。此外,在显微镜下对富有机质页岩的岩石组分和有机质赋存状态进行了详细的观察和描述。结果表明,富有机质页岩在时间上主要形成于海平面下降三级阶段,空间上主要发育于研究区东西两侧,有机质富集与触手状体密切相关,可能受“生物泵”的影响。
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来源期刊
Acta Geologica Sinica ‐ English Edition
Acta Geologica Sinica ‐ English Edition 地学-地球科学综合
CiteScore
3.00
自引率
12.10%
发文量
3039
审稿时长
6 months
期刊介绍: Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.
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