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DOI: https://doi.org/10.11698/PED.20220412

Sedimentary and provenance characteristics and the basin-mountain relationship of the Jurassic Lianggaoshan Formation in eastern Sichuan Basin, SW China

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  • 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China;
    3. Research Institute of Exploration and Development, PetroChina Southwest Oilfield Company, Chengdu 610041, China;
    4. Yangtze University, Wuhan 430100, China

Received date: 2022-06-13

  Revised date: 2023-01-13

  Online published: 2023-01-31

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Abstract

Based on the data of field outcrops, seismic sections, thin sections, heavy mineral assemblages and detrital zircon U-Pb dating, the sedimentary characteristics, lake level fluctuation and provenance characteristics of the Middle Jurassic Lianggaoshan Formation (J2l) in eastern Sichuan Basin were investigated to reveal the control of tectonic movements of the surrounding orogenic belts on the sedimentary systems. The J2l mainly developed a delta-lake sedimentary system, which contained a complete third-order sequence that was subdivided into four lake level up-down cycles (fourth-order sequence). The lake basins of cycles I and II were mainly distributed in eastern Sichuan Basin, while the lake basins of cycles III and IV migrated to central Sichuan Basin, resulting in the significant difference in sedimentary characteristics between the north and the south of eastern Sichuan Basin. The provenance analysis shows that there were three types of provenances for J2l. Specifically, the parent rocks of type I were mainly acidic igneous rocks and from the proximal northern margin of the Yangtze Plate; the parent rocks of type II were intermediate-acid igneous rocks and metamorphic rocks and from the central parts of the southern and northern Qinling orogenic belts; the parent rocks of type III were mainly metamorphic rocks followed by intermediate-acid igneous rocks, and from the North Daba Mountain area. It is recognized from the changes of sedimentary system and provenance characteristics that the sedimentary evolution of J2l in eastern Sichuan Basin was controlled by the tectonic compression of the Qinling orogenic belt. In the early stage, the lake basin was restricted to the east of the study area, and type I provenacne was dominant. With the intensifying north-south compression of the Qinling orogenic belt, the lake basin expanded rapidly and migrated northward, and the supply of type II provenance increased. In the middle and late stages, the uplift of the North Daba Mountain led to the lake basin migration and the gradual increase in the supply of type III provenance.

Key words： Sichuan Basin; Jurassic; Lianggaoshan Formation; heavy mineral assemblage; zircon U-Pb dating; lake basin migration; provenance analysis; basin-mountain evolution

Cite this article

CHENG Dawei, ZHANG Zhijie, HONG Haitao, ZHANG Shaomin, QIN Chunyu, YUAN Xuanjun, ZHANG Bin, ZHOU Chuanmin, DENG Qingjie . Sedimentary and provenance characteristics and the basin-mountain relationship of the Jurassic Lianggaoshan Formation in eastern Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 0 : 20230404 -20230404 . DOI: 10.11698/PED.20220412

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