广西黎塘孤立台地吉维特阶-法门阶碳酸盐台地生态系到菌藻生态系的演变及其意义

张哲; 杜远生; 龚一鸣; 黄宏伟; 曾雄伟; 李珊珊; 欧阳凯

广西黎塘孤立台地吉维特阶-法门阶碳酸盐台地生态系到菌藻生态系的演变及其意义

张哲²,
杜远生^{1, 2, ,},
龚一鸣^{1, 2},
黄宏伟²,
曾雄伟²,
李珊珊²,
欧阳凯²

1.
中国地质大学生物地质与环境地质教育部重点实验室, 湖北武汉 430074
2.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

中国石油化工股份有限公司海相油气勘探前瞻性项目 G0800-06-ZS-319

详细信息

作者简介:
张哲(1966-), 女, 副研究员, 在读博士研究生, 从事沉积学研究

通讯作者:
杜远生, 男, 教授, 博士生导师, 沉积学方向.E-mail: dxyyz@cug.edu.cn

中图分类号: Q911.6
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出版历程
- 收稿日期: 2007-09-06
- 刊出日期: 2007-11-25

Transformation from Devonian Givetian Carbonate Platform to Famennian Bacteria-Algae Ecosystem in Litang Isolated Platform, Guangxi, and Its Significance

1.
Key Laboratory of Biology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 自泥盆纪埃姆斯期, 广西受陆内裂陷影响, 形成碳酸盐台地与台沟间列的构造格局.吉维特期开始, 六景及相邻的黎塘一带逐渐形成孤立台地的沉积背景.吉维特期, 六景剖面的民塘组为以竹节石为特色的礁前斜坡生态系, 尽管目前没有出露生物礁, 从礁前角砾岩可以恢复曾经存在的礁生态系.而黎塘一带塘家湾组为以珊瑚、层孔虫、腕足类为主要特色的台地生态系.弗拉斯期, 六景剖面的谷闭组则为少量珊瑚、腕足、层孔虫为特色的局限-半开放台地生态系.黎塘一带的桂林组仍为以珊瑚、层孔虫、腕足类为主要特色的台地生态系.六景、黎塘地区自法门期开始发生生态系突变, 六景剖面的融县组和黎塘一带的东村组发育藻礁丘或藻席为特色的藻生态系.该生态系的突变是F-F生物群集绝灭造成的生物类群突变的结果.生态系的特征也与吉维特-弗拉斯期烃源岩的形成、演化密切相关.
- 广西 /
- 泥盆系 /
- 碳酸盐台地 /
- 生境型 /
- 群落
Abstract: The carbonate platforms and the intraplatform troughs resulted from intracontinental rifting were simultaneously developed in Guangxi since the Emsian stage of Devonian. An isolated platform was found to occur at Liujing and Litang areas in central Guangxi since the Givetian stage. A fore-reef slope ecosystem characterized by tentaculites was identifiable in Mintang Fm. in Liujing during the Givetian stage. The occurrence of the reef ecosystem was inferred by the reef congregates in Mintang Fm. rather than the reef outcrop. The carbonate platform ecosystem in the Givetian Tangjiawan Fm. in Litang is composed of corals, stromatopoidea and brachiopoda. An ecosystem of a restricted and partly-open platform developed in Frasinan Gubi Fm., characterized by a small proportion of corals, brachiopoda and stromatopoidea. Frasnian Guilin Fm. in Litang is shown to be an ecosystem of a carbonate platform composed of corals, brachiopoda and stromatopoidea. An abrupt ecosystem change was observed to occur at the boundary between Frasnian and Famennian. Ecosystems of Rongxian Fm. in Liujing and Dongcun Fm. in Litang of Famennian are composed of algae reef and algae sheet. The ecosystem variation was proposed to result from the well known F-F faunal mass extinction. These ecosystem features are closely related to the forming and the evolution of the source rocks in this region.
- Guangxi /
- Devonian /
- carbonate platform /
- biohabitat type /
- community

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图 1 广西六景泥盆系吉维特阶-法门阶生境型柱状图

M.泥状结构; W.粒泥结构; P.泥粒结构; G.粒状结构; M1.白云岩化; M2.白云岩

Fig. 1. Column of biohabitat types from Givetian to Famennian of Devonian in Liujing section, Guangxi

下载: 全尺寸图片幻灯片

图 2 六景-黎塘吉维特-弗拉斯期孤立台地生境型剖面示意图

Fig. 2. Section of biohabitat types of isolated platform from Devonian Givetian to Frasnian of in Liujing and Litang sections

下载: 全尺寸图片幻灯片

图 3 广西六景融县组97-98层藻灰岩

a.藻礁; b.肾形藻; c.表附藻; d.球松藻

Fig. 3. Algae limestone in 97-98 beds of Rongxian Fm. in Liujing, Guangxi

下载: 全尺寸图片幻灯片

图 4 广西六景-黎塘泥盆纪吉维特期-法门期生态系突变示意图

Fig. 4. Mutation of ecological system from Givetian to Famennian of Devonian in Liujing and Litang sections, Guangxi

下载: 全尺寸图片幻灯片

表 1 黎塘和六景剖面泥盆纪地层对比

Table 1. Correlation of the Middle to Upper Devonian between Litang and Liujing sections

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