滇西保山地区奥陶系至志留系仁和桥组笔石生物地层

郑书粲; 冯庆来; 龙精杰; 陶振鹏

doi:10.19509/j.cnki.dzkq.tb20240430

滇西保山地区奥陶系至志留系仁和桥组笔石生物地层

doi: 10.19509/j.cnki.dzkq.tb20240430

郑书粲^1,,
冯庆来^2, ,,
龙精杰^{2, 3},
陶振鹏¹

1 .
黄冈师范学院建筑工程学院，湖北黄冈 438000
2 .
中国地质大学（武汉）地球科学学院，武汉 430074
3 .
湖南省地质灾害调查监测所，长沙 410029

基金项目: 湖北省自然科学基金计划项目“滇西下志留统仁和桥组黑色岩系成烃生物类型对有机质富集的影响机理研究”（2024AFB337）；黄冈师范学院高级别培育项目“保山地块仁和桥组黑色泥页岩成烃生物演化规律研究”（202525404）；湖北省教育厅哲学社会科学研究项目“鄂东古生物化石的调查、发掘与开发利用研究”（23Q072）；中石化勘探分公司项目“保山地块页岩气资源调查与评价”（合同编号“35450003-22-ZC0607-0003”）

详细信息

作者简介:
郑书粲：E-mail：zhengshucan@cug.edu.cn

通讯作者:
E-mail：qinglaifeng@cug.edu.cn

中图分类号: P534；Q911
计量
- 文章访问数: 76
- PDF下载量: 11
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-03
- 录用日期: 2024-11-21
- 修回日期: 2024-11-18
- 网络出版日期: 2025-06-11

Graptolite Biostratigraphy of the Ordovician to Silurian Renheqiao Formation in the Baoshan region, southern Yunnan, China

1 .
School of Architectural Engineering of Huanggang Normal University, Huanggang Hubei 438000, China
2 .
School of Earth Science, China University of Geoscience (Wuhan), Wuhan 430074, China
3 .
Hunan Province Geological Disaster Survey and Monitoring Institute, Changsha 410029, China

More Information

Author Bio:
E-mail：zhengshucan@cug.edu.cn

Corresponding author: E-mail：qinglaifeng@cug.edu.cn

摘要

摘要:
滇西保山地区广泛发育奥陶系−志留系仁和桥组黑色岩系。为了建立其笔石地层时空对比框架，以云南保山市施甸县半坡剖面和茶地剖面为研究对象，开展了生物地层学和岩石学研究。研究表明，研究区仁和桥组总厚度约71.6 m，底部发育一层厚约25 cm的古风化壳，与下伏蒲缥组呈平行不整合接触，证明研究区在晚奥陶世曾暴露于地表。基于高分辨率笔石化石调查，识别出了上奥陶统赫南特阶至志留系兰多维列统特列奇阶共9个笔石带，自下而上依次为Metabolograptus persculptus带（仁和桥组第1笔石带，后续简称R1）、Akidograptus ascensus带（R2）、Parakidograptus acuminatus带（R3）、Cystograptus vesiculosus带（R4）、Coronograptus cyphus带（R5）、Demirastrites triangulatus带（R6），Lituigraptus convolutus带（R7），Stimulograptus sedgwickii带（R8）和Spirograptus guerichi带（R9）。与扬子地区龙马溪组笔石生物地层对比表明，保山地区仁和桥组9个笔石带能够与龙马溪组LM1～LM9笔石带相对应。此研究成果为保山地区仁和桥组页岩气调查评价建立了良好的笔石生物地层学基础。
- 奥陶系−志留系 /
- 仁和桥组 /
- 笔石生物地层 /
- 龙马溪组 /
- 滇西保山地区
Abstract: <p>The Ordovician to Silurian Renheqiao Formation, characterized by a sequence of well-preserved black shales, is extensively developed in the Baoshan region, southwestern Yunnan Province, China. </p></sec><sec><title>Objective
The primary goal of this study is to establish a graptolite biostratigraphic framework for the Renheqiao Formation. To achieve this, the research focuses on the Banpo and Chadi sections in Shidian County, Baoshan City, Yunnan Province, which are critical outcrops for biostratigraphic analysis in the area.
Methods
A combination of high-resolution biostratigraphic and lithologic records was conducted to precisely define the stratigraphy and identify key biozones within the formation.
Results
The Renheqiao Formation in the study area is approximately 71.6 meters thick, with a about 25 cm of paleo-weathering crust at the base. It unconformably overlies the Pupiao Formation, indicating that the study area was subaerially exposed during the Late Ordovician. Based on detailed fieldwork and high-resolution surveys, a total of nine graptolite zones were identified, spanning from the upper Hirnantian in the Ordovician to the Silurian Llandovery Telychian stage. These identified graptolite zones are in ascending order as follows: the Metabolograptus persculptus zone (R1), Akidograptus ascensus zone (R2), Parakidograptus acuminatus zone (R3), Cystograptus vesiculosus zone (R4), Coronograptus cyphus zone (R5), Demirastrites triangulatus zone (R6), Lituigraptus convolutus zone (R7), Stimulograptus sedgwickii zone (R8), and Spirograptus guerichi zone (R9).
Conclusion
The nine graptolite zones of the Renheqiao Formation in the Baoshan region correlate well with those of the Longmaxi Formation (LM1–LM9) in the Yangtze region. This correlation not only strengthens the regional stratigraphic framework but also provides a solid basis for future shale gas exploration and assessment in the Baoshan region.
- Ordovician-Silurian /
- Renheqiao Formation /
- graptolite biostratigraphy /
- Longmaxi Formation /
- Baoshan region, southern Yunnan

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图 1 茶地剖面和半坡剖面交通位置图

Figure 1. Location maps of the Chadi section and the Banpo section

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图 2 茶地剖面典型标志层

a. 剖面露头及第1层蒲缥组和第2～4层仁和桥组地层界限；b. 仁和桥组第2层古风化壳；c. 仁和桥组第5层平行层理；数字代表仁和桥组第1～4层地层

Figure 2. Stratigraphic boundary and typical marker bed of Chadi section

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图 3 茶地剖面（a）和半坡剖面（b）岩性柱状图和代表性岩石薄片照片

Figure 3. Lithostratigraphic column and the representative lithologic thin sections of the Chadi section (a) and the Banpo section (b)

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图 4 半坡剖面野外照片

a. 剖面露头及仁和桥组地层界线；b. 仁和桥组第1层，风化面为灰白色的薄层状碳质泥岩；c. 仁和桥组第3层，纹层状清晰的碳质泥岩；数字代表仁和桥组第1～4层地层

Figure 4. Outcrop photos of the Banpo section

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图 5 茶地剖面部分笔石照片

a. Metalograptus ojsuensis Koren' and Mikhaylova in Apollonov et al. 1980，样品点CD-3; b. Metabolograptus persculptus Elles and Wood 1907，样品点CD-3; c. Akidograptus ascensus Davies 1929，样品点CD-4; d. Parakidograptus acuminatus Nicholson 1867，样品点CD-4; e. Cystograptus vesiculosus Nicholson 1868，样品点CD-4; f. Cystograptus ancestralis Štorch 1972，样品点CD-4; g. Demirastrites triangulatus Harkness 1851，样品点CD-7; h. Rastrites guizhouensis Mu 2002，样品点CD-10; i. Coronograptus cyphus Lapworth 1876, 样品点CD-10

Figure 5. Graptolites photos form the Chadi section

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图 6 半坡剖面部分笔石照片

a. Euclimacograptus Riva 1989，样品点BP-3；b.Normalograptus sp.，样品点BP-6；c. Glyptograptus sp.，样品点BP-7-0；d. Demirastrites magnificus Pribyl and Munch 1942，样品点BP-0；e. Rastrites peregrinus Barrande 1850，样品点BP-9-1；f, n, o. Stimulograptus sedgwickii Portlock 1843，样品点BP-9-1，BP-11，BP-12；g. Rastrites distans Lapworth 1876；h. Spirograptus guerichi Loydell et al. 1993，样品点BP-9-2；i. Monograptus yichangensis Ni 1987，样品点BP-0-7；j. Demirastrites triangulatus Harkness 1851，样品点BP-2-1；k. Spirograptus guerichi Loydell et al. 1993，样品点BP-12；l. Rastrites distans abbreviatus Lapworth 1876，样品点BP-2-1；m. Oktavites gracilis Wang 1978，样品点BP-6-1；p. Petalolithus sp.，样品点BP-7-1；q. Pribylograptus argutus Lapworth 1876，样品点BP-7-3；r. Pernerograptus Pribyl 1941，样品点BP-9-2；s. Demirastrites triangulatus，样品点BP-0-0；t. Spirograptus guerichi Loydell et al. 1993，样品点BP-9-2；u. Lituigraptus convolutus Hisinger 1837，样品点BP-7-3；v. Pernerograptus qijiangensis Ye 1978，样品点BP-8-1；w. Monograptus gemmatus Barrande 1850，样品点BP-9；x. Pristiograptus sp.，样品点BP-1；y. Pristiograptus sichuanensis Ye 1978，样品点BP-0-4；z. Monograptus xizangensis Mu and Ni 1975，样品点BP-6

Figure 6. Graptolites photos form the Banpo section

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图 7 茶地剖面部分笔石延限图（红色代表带化石）

Figure 7. Graptolites distribution of Chadi section

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图 8 半坡剖面部分笔石延限图（红色代表带化石）

Figure 8. Graptolites distribution of Banpo section

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图 9 仁和桥组与龙马溪组笔石带序列对比图

Figure 9. Graptolite zones comparison between the Renheqiao Formation and the Longmaxi Formation

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