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2023 Vol. 50, No. 2
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LIU Zining, DOU Lei, ZHANG Wei, ZHU Wenbin, MO Bin, CHEN En, JIA Lei. 2023. Identification and characteristics of a new section of the Lower Carboniferous Lianxian Formation in the Lianzhou area, northwest Guangdong[J]. Geology in China, 50(2): 533-542. doi: 10.12029/gc20191225003
Citation: LIU Zining, DOU Lei, ZHANG Wei, ZHU Wenbin, MO Bin, CHEN En, JIA Lei. 2023. Identification and characteristics of a new section of the Lower Carboniferous Lianxian Formation in the Lianzhou area, northwest Guangdong[J]. Geology in China, 50(2): 533-542. doi: 10.12029/gc20191225003
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Identification and characteristics of a new section of the Lower Carboniferous Lianxian Formation in the Lianzhou area, northwest Guangdong

  • Guangdong Institute of Geological Survey, Guangzhou 510080, Guangdong, China

    • Fund Project: Supported by the project of Guangdong Institute of Geological Survey Regional Geology and Mineral Resources Exploration (1∶50 000) in the Fengyang, Dalubian, Dongbei and Lianxian areas, Guangdong(No.12120114072101)and Update and Comprehensive Mapping project of Regional Geology Survey Achievement in Guanggdong(No.202315)
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  • Author Bio: LIU Zining, male, born in 1984, senior engineer, engaged in regional geology and mineral resources exploration; E-mail: gdliuzining@163.com
Received Date:  25 December 2019
Revised Date:  22 June 2020
Publish Date:  25 April 2023
    Abstract

  • This paper is the result of geological survey engineering.

     Objective

    A large suite of carbonates developed in the Early Carboniferous in the Lianzhou area of northwest Guangdong, and the representative stratigraphic section of the Lianxian Formation is an ideal stratigraphic section for studying carbonate deposition in this period. The bottom boundary of the selected stratigraphic section of the Banling Village of the former Lianxian Formation is unclear and the outcrop is severely damaged, which has lost the functional value of the stratigraphic section. There is an urgent need to find a new stratigraphic section in the Lianxian Formation to provide a reference for the stratigraphic stratigraphy of the Lower Carboniferous and regional geological survey studies in the area.

     Methods

    Tematically studied by means of large scale sectioning, rock identification and paleostratigraphy of the stratigraphic section in Longtan Shijietou village of Jiubei, Lianzhou city, Guangdong. The stratigraphic characteristics of the sequence were obtained and the age of the bottom boundary was determined.

     Results

    Based on the evolutionary sequence of foraminifera, the disappearance of foraminiferal Quasiendothyra kobeitusana, Q. konensis and the first occurrence of Bisphaera irregularis birina reveal that the boundary between Devonian and Carboniferous in the Lianzhou area of northwestern Guangdong passed through the middle of the granular tuff at the top of the Changlai Formation. Combined with the stratigraphic, the developmental age of the Lianxian Formation can be the restricted to the Early Carboniferous Dunei stage.

     Conclusions

    This section is the largest section with continuous deposition of Early Carboniferous early carbonate rocks known in the region, with complete stratigraphic sequence development and clear top and bottom interfaces, and is the most ideal secondary stratigraphic section found in the Lianxian Formation. This lays the foundation for the establishment of the substratigraphic type (reference section) of the Lianxian Formation. The above results are of great significance for the construction of the regional stratigraphic framework in northwestern Guangdong, the conduct of regional stratigraphic delineation and comparative studies, and the improvement of the regional geological background.
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