Identification and characteristics of a new section of the Lower Carboniferous Lianxian Formation in the Lianzhou area, northwest Guangdong
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摘要:
研究目的 粤西北连州地区在早石炭世发育了大套的碳酸盐岩，代表性地层连县组是研究该时期碳酸盐岩沉积的理想地层。原连县组的半岭村选层型剖面底界不清，露头破坏严重，已失去层型剖面的功能价值，亟须在连县组中寻找新的层型剖面，为该地区下石炭统的层序地层学研究和区域地质调查研究提供参考。
研究方法 通过大比例尺剖面测制、岩石鉴定和古生物地层等手段，系统研究了连州市九陂镇龙潭石街头地层剖面的岩性组合、生物化石和沉积环境，获得了其层序地层学特征，并厘定其底界时代。
研究结果 依据有孔虫的演化序列，以有孔虫化石Quasiendothyra kobeitusana，Q.konensis的消失和Bisphaera irregularis birina的首次出现，揭露了粤西北连州地区泥盆系与石炭系的界线从长垑组顶部层位粒屑灰岩中间通过，结合地层的叠复关系，连县组的发育时代可下延限于早石炭世杜内期。
结论 该剖面是目前区内已知早石炭世早期碳酸盐岩连续沉积厚度最大的剖面，地层序列发育完整，顶、底界面清楚，是连县组中已发现的最为理想的辅助层型剖面。这为建立连县组的次层型（参考剖面）奠定了基础。上述成果，对于粤西北地区区域地层格架的构建，区域地层划分与对比研究的进行，以及区域地质背景的完善都具有较大意义。
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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表 1 连州地区早石炭世岩石地层单位划分沿革表
Table 1. Divided history table of the early Carboniferous stratigraphy in Lianzhou area
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All China Commission of Stratigraphy. 2017. Stratigraphic Guide of China(2016)[M]. Beijing: Geological Publishing House (in Chinese).
Chen En. 2017. Lithostratigraphy and spatial variation of the lower Carboniferous Lianxian Formationin, Lianzhou, Guangdong Province[J]. Journal of Stratigraphy, 41(3): 278-283(in Chinese with English abstract).
Geology and Mineral Resources of Guangdong Province. 1988. Regional Geology of Guangdong Province[M]. Beijing: Geological Publishing House (in Chinese).
Geology and Mineral Resources of Guangdong Province. 1996. Stratigraphy (Lithostratic) of Guangdong Province[M]. Wuhan: China University of Geosciences Press (in Chinese).
Guang Shicong, Yan Huaiyu, Qiu Dongzhou, Wang Shoude, Chen Xianqun, Zhou Jingcai. 1980. Investigations on the marine sedimentary environmental model of China in late Proterozoic to Triassic periods[J]. Oil & Gas Geology, 1(1): 2-17(in Chinese with English abstract).
Ji Qiang, Wang Xunri. 2017. On the subdivision of early Early Carboniferous stages and substages in China[J]. Journal of Geology, 41(2): 171-176(in Chinese with English abstract). doi: 10.3969/j.issn.1674-3636.2017.02.001
Li Zhihong, Cheng Long, Zhao Laishi, Wang Chuanshang, Peng Zhongqin, Wang Baozhong. 2015. New progress in the study of the early Early Carboniferous conodonts biostratigraphy from Nandong, Guangxi[J]. Geology in China, 42(4): 990-1008(in Chinese with English abstract). doi: 10.3969/j.issn.1000-3657.2015.04.015
Lin Jiaxing, Shi Guorun. 1986. Early Carboniferous Foraminifera-Bearing strata in Guangdong, Hunan and Hubei, and their correlations[J]. Acta Micropalaeontologica Sinaica, 4: 387-398, 464-465(in Chinese with English abstract).
Mo Zhusun, Du Hengling. 1943. The geological of Lianxian area in the Guangdong Province[J]. The Geological Collection of Guangdong and Guangxi Geological Survey Institutes, 1: 9-43.
Qin Guorong, Zhao Ruxuan, Ji Qiang. 1988. Late Devonian and early Carboniferous conodonts from northern Guangdong and their stratigraphic significance[J]. Acta Micropalaeontologica Sinaica, 5(1): 57-71(in Chinese with English abstract).
Tan Zhengxiu. 1990. The lower boundary and intermediate boundary of the Carboniferous in Hunan[J]. Regional Geology of China, 1: 51-59(in Chinese with English abstract).
Wu Wangshi, Zhao Xiuhu, Zhao Jiaming, Wang Keliang, Wu Xiuyuan, Rong Jiayu, Xia Fengsheng. 1980. The Lower Carboniferous rocks of Shaoguan, Lianxian and Lianping district, Guangdong[J]. Serial books of Nanjing Institute of Geology & Palaeontology, Chinese Academy of Sciences, 1: 1-32(in Chinese with English abstract).
Wu Xianghe, Liao Shuzheng. 2001. Foraminiferal Zonation of early Carboniferous from the South-Western margin of Yangze Platform[J]. Acta Micropalaeontologica Sinaica, 18(3): 293-308(in Chinese with English abstract).
Xu Shouyong. 1996. The coal, foraminifer and conodont biostratigraphy near the Devonian-Carboniferous boundary in South China[J]. Journal of Stratigraphy, 20(4): 241-252(in Chinese with English abstract).
陈恩. 2017. 广东连州地区下石炭统连县组岩性组合及分布规律[J]. 地层学杂志, 41(3): 278-283. https://www.cnki.com.cn/Article/CJFDTOTAL-DCXZ201703006.htm
关士聪, 演怀玉, 邱东洲, 王守德, 陈显群, 周经才. 1980. 中国晚元古代至三叠纪海域沉积环境模式探讨[J]. 石油与天然气地质, 1(1): 2-17.
广东省地质矿产局. 1988. 广东省区域地质志[M]. 北京: 地质出版社.
广东省地质矿产局. 1996. 广东省岩石地层[M]. 武汉: 中国地质大学出版社, 71-72.
季强, 王旭日. 2017. 中国早石炭世早期阶和亚阶的划分与对比[J]. 地质学刊, 41(2): 171-176.
李志宏, 程龙, 赵来时, 王传尚, 彭中勤, 王保忠. 2015. 广西南垌早石炭世牙形石生物地层研究新进展[J]. 中国地质, 42(4): 990-1008. doi: 10.3969/j.issn.1000-3657.2015.04.015 http://geochina.cgs.gov.cn/geochina/article/abstract/20150415?st=search
林甲兴, 施国润. 1986. 粤、湘、鄂早石炭世含有孔虫地层及其对比[J]. 微体古生物学, (4): 387-398, 464-465. https://www.cnki.com.cn/Article/CJFDTOTAL-WSGT198604006.htm
莫柱孙, 杜衡龄. 1943. 广东连县区地质[J]. 两广地质调查所地质集刊, 1: 9-43.
秦国荣, 赵汝璇, 季强. 1998. 粤北晚泥盆世和早石炭世牙形刺的发现及其地层意义[J]. 微体古生物学报, 5(1): 57-71. https://www.cnki.com.cn/Article/CJFDTOTAL-WSGT198801008.htm
全国地层委员会. 2017. 中国地层指南及中国地层指南说明书: 2016版[M]. 北京: 地质出版社.
谭正修. 1990. 湖南石炭系底界及中间界线[J]. 中国区域地质, 1: 51-59.
吴望始, 赵修祐, 赵嘉明, 王克良, 吴秀元, 戎嘉余, 夏凤生. 1980. 广东韵关、连县和连平的早石炭世地层[J]. 中国科学院南京地质古生物学研究所丛刊, 1: 1-32.
吴祥和, 廖书正. 2001. 扬子地台西南缘早石炭世早期有孔虫化石带[J]. 微体古生物学报, 18(3): 293-308.
许寿永. 1996. 华南泥盆系-石炭系界线附近的珊瑚、有孔虫和牙形类及其地层意义[J]. 地层学杂志, 20(4): 241-252. https://www.cnki.com.cn/Article/CJFDTOTAL-DCXZ604.000.htm
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