湖南益阳奥陶系五峰组—志留系周家溪群笔石

doi:10.19657/j.geoscience.1000-8527.2021.075

现代地质 ›› 2021, Vol. 35 ›› Issue (05): 1343-1353.DOI: 10.19657/j.geoscience.1000-8527.2021.075

湖南益阳奥陶系五峰组—志留系周家溪群笔石

黄莫¹^,²^,³(), 李明², 杨振京¹^,³(), 邓丽婷¹^,²^,³

1.河北地质大学地球科学学院,河北石家庄 050031
2.中国地质科学院地质研究所,北京 100037
3.中国地质科学院水文地质环境地质研究所,河北石家庄 050800

收稿日期:2021-02-10 修回日期:2021-05-24 出版日期:2021-10-10 发布日期:2021-11-04
通讯作者: 杨振京
作者简介:杨振京,男,研究员,1966年出生,古生物学与地层学专业,主要从事孢粉及相关地层研究。Email: yangzhenjing@mail.cgs.gov.cn。
黄莫,男,硕士研究生,1995年出生,古生物学与地层学专业,主要从事笔石系统学和地层学研究。Email: huangmo_1995@126.com。
基金资助:
中国地质科学院地质研究所基本科研业务费项目“柴北缘中奥陶世黑色页岩笔石地层研究”(J2035);中国地质调查局项目“蒙西、豫西、鄂西北等典型古生物群与关键地层基础地质调查”(DD20190008);中国地质调查局项目“地质云系统集成与共享服务”(DD20190397)

Graptolites from OrdovicianWufeng Formation and Silurian Zhoujiaxi Group in Yiyang, Hunan

HUANG Mo¹^,²^,³(), LI Ming², YANG Zhenjing¹^,³(), DENG Liting¹^,²^,³

1. School of Earth Sciences, Hebei Geosciences University, Shijiazhuang, Hebei 050031, China
2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050800, China

Received:2021-02-10 Revised:2021-05-24 Online:2021-10-10 Published:2021-11-04
Contact: YANG Zhenjing

摘要/Abstract

摘要：

为响应国际地层委员会奥陶系分会的要求,实现扬子区与江南区奥陶纪晚期—志留纪早期生物地层精时对比,选取位于江南斜坡带的湖南益阳南坝剖面作为研究对象,对志留系底部Parakidograptus acuminatus带笔石进行了系统的研究。剖面内五峰组岩性为黑色页岩,与上覆周家溪群下组整合接触,地层连续无沉积间断。通过连续不间断采集笔石标本,在研究剖面共识别出笔石6属8种,包括:Parakidograptus acuminatus,Normalograptus elegantulus,Nor. mirnyensis,Metabolograptus persculptus,Neodiplograptus parajanus,Neo. guantangyuanensis,Petalithus hamus,Streptograptus cyclodontus。依据获取的笔石标本,初步识别出Metabolograptus persculptus带和Parakidograptus acuminatus带,确定研究剖面时代为晚奥陶世赫南特期—早志留世鲁丹期。

关键词: 笔石, 系统分类学, 五峰组, 周家溪群, 奥陶系—志留系, 湖南益阳

Abstract:

In response to the request of the Ordovician Branch of the International Commission on Stratigraphy, and to refine the biostratigraphic correlation across the Late Ordovician-Early Silurian Yangtze-Jiangnan region, we systematically studied the Nanba section (Yiyang, Hunan province) in the Jiangnan slope belt, and graptolites from the Parakidograptus acuminatus biozone at the bottom of the Silurian sequence. The Wufeng Formation comprises black shale, which is integrated with the Lower Formation of the Zhoujiaxi Group, and the sedimentation is continuous without interruption. Based on data of the study area and referenced from domestic and international graptolite literature, 6 genera and 8 species of graptolites were identified, including Parakidograptus acuminatus, Normalograptus elegantulus, Nor. mirnyensis, Metabolograptus persculptus, Neodiplograptus parajanus, Neo. guantangyuanensis, Avitograptus acanthocystus, Petalithus hamus, Streptograptus cyclodontus. On the basis of the obtained graptolite specimens, the Metabolograptus persculptus biozone and the Parakidograptus acuminatus biozone was preliminarily identified. Stratigraphic age of this section was determined to be from the Late Ordovician (Hirnantian) to the Early Silurian (Rhuddanian).

Key words: graptolites, systematic taxonomy, Wufeng Formation, Zhoujiaxi Group, Ordovician-Silurian, Yiyang, Hunan

中图分类号:

黄莫, 李明, 杨振京, 邓丽婷. 湖南益阳奥陶系五峰组—志留系周家溪群笔石[J]. 现代地质, 2021, 35(05): 1343-1353.

HUANG Mo, LI Ming, YANG Zhenjing, DENG Liting. Graptolites from OrdovicianWufeng Formation and Silurian Zhoujiaxi Group in Yiyang, Hunan[J]. Geoscience, 2021, 35(05): 1343-1353.

图/表 4

图1 湖南益阳南坝古地理图(a)及交通图(b)(据李明等[21,22]修改)

Fig.1 Paleogeographic map (a) and traffic map (b) of Nanba,Yiyang, Hunan (modified from Li et al.[21,22])

图2 湖南南坝剖面岩性柱状图及笔石分布图

Fig.2 Lithostratigraphic column and graptolite distribution of the Nanba section in Hunan

图3 湖南益阳南坝剖面的笔石镜下照片 (a) Normalograptus mirnyensis (Obut and Sobolevskaya, 1967), YYNF-36-13-01; (b) Neodiplograptus parajanus(Štorch, 1983a), YYNF-36-18-01; (c) Normalograptus elegantulus (Mu and Ni, 1983), YYNF-36-17-01; (d)Parakidograptus acuminatus (Nicholson, 1867), YYNF-36-44-01; (e) Metabolograptus persculptus(Elles and Wood,1907), YYNF-32-08-01; (f)(g)Neodiplograptus guantangyuanensis (Fang et al., 1990), (f)为YYNF-36-20-01, (g)为 YYNF-36-46-01; (h)Petalithus hamus (Chen and Lin, 1978), YYNF-37-02-02; (i) Streptograptus cyclodontus (Chen, 1984), YYNF-37-01-01; 图中比例尺长均代表1 mm。本文所研究的所有标本均保存于中国地质科学院地质研究所样品标本库

Fig.3 Microphotographs of graptolites from the Nanba section at Yiyang, Hunan

图4 湖南益阳南坝剖面的笔石素描图 (a) Normalograptus elegantulus(Mu and Ni, 1983); (b) Neodiplograptus parajanus(Štorch, 1983);(c) Metabolograptus persculptus (Elles and Wood, 1907); (d) Neodiplograptus guantangyuanensis(Fang et al., 1990); (e) Parakidograptus acuminatus (Nicholson, 1867); (f) Normalograptus mirnyensis(Obut and Sobolevskaya, 1967); (g)Petalithus hamus (Chen and Lin, 1978); 说明同图3

Fig.4 Sketch of graptolites from the Nanba section at Yiyang, Hunan

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湖南益阳奥陶系五峰组—志留系周家溪群笔石

Graptolites from OrdovicianWufeng Formation and Silurian Zhoujiaxi Group in Yiyang, Hunan

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