从地球生物学角度讨论华南中二叠世海相烃源岩缺氧沉积环境成因模式

颜佳新; 刘新宇

从地球生物学角度讨论华南中二叠世海相烃源岩缺氧沉积环境成因模式

颜佳新^{1, 2,},
刘新宇¹

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:

国家自然科学基金面上项目 40472062

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:
颜佳新(1962-), 男, 教授, 博士生导师, 主要从事沉积地质学研究工作.E-mail: jxyan@cug.edu.cn

中图分类号: P736.22
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出版历程
- 收稿日期: 2007-08-26
- 刊出日期: 2007-11-25

Geobiological Interpretation of the Oxygen-Deficient Deposits of the Middle Permian Marine Source Rocks in South China: A Working Hypothesis

YAN Jia-xin^{1, 2
,},
LIU Xin-yu¹

1.
Key Laboratory of Biogeology 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: 探讨陆棚环境缺氧沉积的成因, 对查明海相优质烃源岩时空分布、恢复地史时期古环境演化具有重要意义.华南地区中二叠世栖霞组有机质丰富, 出现多方面缺氧沉积特征, 同时多门类底栖生物繁盛, 其成因一直令人困惑.简要介绍了陆棚浅海缺氧环境的生物特征及古氧相划分, 分析了栖霞组一个由纹层状灰岩和块状灰岩组成的典型的沉积序列的古氧相特征.块状灰岩的生物特征和地球化学特征均指示常氧沉积环境; 而纹层状灰岩的生物特征偏向常氧相, 沉积地球化学特征偏向厌氧相, 体现了陆棚缺氧沉积环境水体溶氧量不稳定的特点.栖霞组沉积特征表明, 栖霞组缺氧沉积环境的频繁出现与较高的生物产率有关.结合区域古地理和古特提斯古海洋背景, 认为华南地区中二叠世缺氧环境的成因与当时陆海分布格局和古海洋表面洋流系统有关.
- 华南地区 /
- 中二叠世 /
- 缺氧 /
- 古氧相 /
- 模式
Abstract: To decipher the origin of oxygen-deficient shelf deposits is significant for tracing the distributions of marine hydrocarbon source rocks and interpreting the evolution of depositional environments. The origin of the Middle Permian Chihsia Formation from South China remains a puzzle for long, with its evident oxygen-deficient features associated with diverse benthos. This paper introduce briefly the nature of oxygen-deficient shelf environment as well as subdivision of related paleoxygenation facies, and shows a typical Chihsian depositional sequence with ecological and geochemical features. Massive bioclastic limestone from the middle of the sequence was believed to be formed under the aerobic conditions, supporting by both ecological and geochemical features. However, a contradictory conclusion is observed for "laminated" limestones from the lower and upper parts of the sequence; the aerobic ecological signal was associated with the anoxic geochemical record. The association of contradictory signals in ecology and geochemistry was here interpreted as the instability of paleoxygenation condition in shelf environment, caused by enhanced paleoproductivity. Repetitive occurrence of oxygen-deficient condition might have been stemmed from paleo-Tethyan currents flowing across the South China.
- South China /
- Middle Permian /
- oxygen-deficient /
- paleoxygenation facies /
- model

HTML全文

图 1 A为栖霞组典型沉积序列野外照片, 江西萍乡慈化; B为照片A中部(CH-10) 显微照片(X5);C为照片A中部(CH-13) 显微照片(X5);D层纹状灰岩显微照片(X5, 广西来宾栖霞组中部)

Fig. 1. Photography of Chihsia limestone. A.Exposure of a typical Chisian limestone bed with plenty fusulinid in its lower and top parts, Cihua, Jiangxi; B.Microphotography of sample CH-10 from the middle of the sampled bed; C.Microphotography of sample CH-13 from the upper part of the sampled bed; D.Microphotography of Chihsian laminated limestone from the Tieqiao section, Laibin of Guangxi

下载: 全尺寸图片幻灯片

图 2 栖霞组典型沉积序列(图 1A) 的地球化学特征

Fig. 2. Geochemical profiles of a typical limestone bed in Chihsian Stage (Fig. 1A)

下载: 全尺寸图片幻灯片

图 3 华南地区栖霞期表面洋流再造

A.栖霞期全球古大陆再造及古洋流格局, 方框内为华南地区(Yan and Zhao, 2001); B.华南地区二叠纪栖霞组岩相古地理; C.华南地区栖霞期表面洋流再造(地块分布据殷鸿福未刊资料)

Fig. 3. Paleocurrent reconstruction of the Chihsian Stage in the South China region

下载: 全尺寸图片幻灯片

表 1 古氧相划分及相应术语中文翻译(划分方案据Tyson and Pearson, 1991)

Table 1. Terminology for low oxygen regime and the resulting biofacies in marine environments

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