| 臼齿碳酸盐岩成因探讨——以吉林-辽宁地区新元古界为例 |
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| 引用本文： | 旷红伟,孟祥化,葛铭.臼齿碳酸盐岩成因探讨——以吉林-辽宁地区新元古界为例[J].古地理学报,2006,8(1):63-73. |
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| 作者姓名： | 旷红伟 孟祥化 葛铭 |
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| 作者单位： | 1.长江大学地球物理与石油资源学院，油气资源与勘探技术教育部重点实验室(长江大学)，湖北荆州 434023； ;2.中国地质大学沉积盆地研究所，北京 100083 |
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| 基金项目： | 本文受国际地质对比计划项目IGCP447(批准号:SC／GEO／546／447)，国家自然科学基金项目(批准号:40172043)，长江大学自然科学发展基金资助 |
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| 摘 要： | 臼齿(Molar Tooth)碳酸盐岩问题已经研究了100多年,许多学者都对它的成因提出了不同的假设，但始终未能取得共识。文中作者列举了现有各种臼齿碳酸盐岩的成因假说，指出了这些成因假说中存在的种种问题和矛盾，并提出了臼齿碳酸盐岩生物成因的可能性。从元古代生物演化的规律说明臼齿碳酸盐岩形成、繁盛及衰退的时期与地球上真核生物的出现和繁盛及后生动物出现的界线相一致；从臼齿碳酸盐岩形成的构造背景、气候条件和沉积环境、结构构造特征、化学组成（特别是黄铁矿的形态和SnO2的富集）、碳、氧同位素的分布规律以及生物标志物的多样性等方面提出了臼齿（微亮晶）碳酸盐岩生物成因可能性的证据；还特别指出元古代叠层石的生长和繁盛与臼齿碳酸盐的岩发育呈负相关关系。 同时也阐述了生物成因解释遇到的困难，并指出今后应大力开展臼齿碳酸盐岩形成的沉积环境与岩相，特别是早期成岩作用和相关地球化学特征研究。从元古代古海洋化学性质的变化着手研究将成为揭示臼齿碳酸盐岩成因的根本手段。
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| 关 键 词： | 臼齿 碳酸盐岩 成因 新元古界 吉林-辽宁地区 |
| 文章编号： | 1671-1505（2006）01-0063-11 |
| 收稿时间： | 2005-06-19 |
| 修稿时间： | 2005-08-06 |
Discussion on origin for Molar Tooth carbonate rocks: An example from the Neoproterozoic in Jilin-Liaoning area |
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| Kuang Hongwei,Meng Xianghua,Ge Ming.Discussion on origin for Molar Tooth carbonate rocks: An example from the Neoproterozoic in Jilin-Liaoning area[J].Journal of Palaeogeography,2006,8(1):63-73. |
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| Authors: | Kuang Hongwei Meng Xianghua Ge Ming |
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| Institution: | 1.School of Geophysics and Petroleum Resource , Yangtze University, Key Laboratory of Exploration Technologies for Oil and Gas Resources,Yangtze University, Ministry of Education, Jingzhou 434023, Hubei;2.Institute of sedimentary basin, China University of Geosciences, Beijing 100083 |
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| Abstract: | The origin for Molar Tooth carbonate rocks has been studied more than 100 years, and many scholars have put forward different hypotheses about it. Up to now, a consensus still has not been reached. This study cites all kinds of origin hypotheses for Molar Tooth carbonate rocks at present, points out all the problems and controdictions in these origin hypotheses and advances the possibility of biologic origin for Molar Tooth carbonate rocks. The biological evolution regularity of the Proterozoic illustrates the formation, blooming and withering periods of Molar Tooth carbonate rocks corresponded to the appearing and blooming time boundary of the Eucaryotes and appearing time boundary of the Metazoans. The evidences that prove the possibility of biologic origin for Molar Tooth carbonate rocks include: the structure features, chemical components (especially the shape of pyrite and abundance of SnO2) , the distribution regularity of carbon and oxygen isotopes and the diversity of biomarkers. It is emphasized that there is a negative correlation between the growth and blooming of the Proterozoic stromotolites and Molar Tooth carbonate rocks development. Difficulties in explaining the biologic origin are also set forth. Finally, this study points out that future research should be focused on the sedimentary environments and lithofacies for the formation of Molar Tooth carbonate rocks, especially their early diagenesis and relavent geochemistry.Studies on the change of chemical features of ancient oceans in the Proterozoic will be the fundamental means to probe the origin for Molar Tooth carbonate rocks. |
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| Keywords: | Molar Tooth (MT) carbonate rock origin Neoproterozoic Jilin-Liaoning area |
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