Paleontological Features and Sedimentary Environment of Dainan Formation in Deep Sag of Gaoyou Sag

doi:10.11885/j.issn.1674-5086.2016.06.29.02

Abstract

Abstract: Based on rock core and paleontology analyses data, combined with the sedimentary facies, the relationship between fossils, such as ostracods and charophytes, and the sedimentary environment of the first and second members of the fifth sub-member of the Dainan Formation in the Deep Sag of Gaoyou Sag were systematically analyzed. Seventy species of ostracods were identified, with the Cyprididae Baird section molecules being dominant, followed by Candonidae Kaufmann, and a small number of Limnocytheridae. The vertical variation in the fossil assemblage reflects the cyclic changes in the lake water during the Dainan Period, namely, brackish water→fresh water→brackish water→brackish water→fresh water. In addition, 76 species of charophytes were identified, including Grovesichara changzhouensis, S tephanochara fortis, Obtusochara longscoluminania, and Sphaerochara parvula. The first sub-member of the first member of the Dainan Formation is most prosperous, which manifests a quiet and brackish-fresh water environment during those periods. The vertical distribution and evolution of the ostracods and charophytes fossil combination has a close relationship with the changes in and distribution of the sedimentary environment and facies. When the ostracods fossil assemblage in fresh to brackish water is in a dominant position and the chara is flourishing, it indicates that terrigenous clastic sediment is abundant. Additionally, the sedimentary facies are dominated by aggradation or a progradation delta and fan delta. When the ostracods fossil assemblage in brackish water is in a dominant position, it indicates that the terrestrial sources are short of clastic substance supply, and the retrogradation delta and fan delta are the main sedimentary facies.

Key words: Gaoyou sag, Dainan Formation, paleontological feature, paleo-water body, sedimentary environment

CLC Number:

TE122

YUAN Jing, XIAO Yunfeng, DONG Daotao, XIONG Guangqin, QIU Yongfeng. Paleontological Features and Sedimentary Environment of Dainan Formation in Deep Sag of Gaoyou Sag[J]. 西南石油大学学报(自然科学版), 2018, 40(1): 11-21.

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