| 扬子地区江口冰期地层的划分对比与南华系层型剖面 |
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| 引用本文： | 张启锐,储雪蕾.扬子地区江口冰期地层的划分对比与南华系层型剖面[J].地层学杂志,2006,30(4):306-314. |
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| 作者姓名： | 张启锐 储雪蕾 |
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| 作者单位： | 中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京,100029 |
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| 基金项目： | 中国科学院知识创新工程项目(编号:KZCX3-SW-141),国家自然科学基金(No.40532012,40373011)共同资助。 |
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| 摘 要： | 我国南方扬子板块是国际上新元古代冰期地层最具代表性的地区之一,冰期记录出露广泛,研究程度较高,为国内外学者所关注。当前,国际上普遍认为新元古代主要有两次全球性大冰期,一般以澳大利亚的Sturtian和Marinoan冰期为代表,扬子地区的南沱冰期和江口冰期与之相对应。但是,围绕扬子地区冰期地层的划分对比一直存在较大争议。关于上冰期的对比,虽然曾出现过不同的意见,但随着南沱组年龄数据的获得看法已趋于一致。目前主要分歧来自对下冰期和间冰期的认识。我国目前通常使用的名称,如“长安冰期”、“富禄间冰期”和“古城冰期”等与国际上的认识有差异,对新建的“南华系”地层划分和对比产生了不同的理解。根据扬子地区地质工作的多年积累和研究的成果,以“江口群”取代原“江口组”,使之成为扬子地区代表下冰期沉积的统一地层单元,江口群涵盖了下冰期的长安组、富禄组及与之相关的地层单元;扬子地区的下冰期相应地称为“江口冰期”,与国际上的Sturtian冰期可以很好地对应,含义更完整。我国南方对应于Sturtian和Marinoan冰期的是江口冰期和南沱冰期。湘黔桂地区的新元古代冰期地层保存最完整连续,其中贵州黎平县的肇兴剖面可考虑作为新元古代冰期地层的候选层型剖面。
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| 关 键 词： | 新元古代冰期 江口群 江口冰期 古城段 两界河段 南华系 层型剖面 |
| 文章编号： | 0253-4959(2006)04-0306-09 |
| 收稿时间： | 01 4 2006 12:00AM |
| 修稿时间： | 03 2 2006 12:00AM |
THE STRATIGRAPHIC CLASSIFICATION AND CORRELATION OF THE JIANGKOU GLACIATION IN THE YANGTZE BLOCK AND THE STRATOTYPE SECTION OF THE NANHUAN SYSTEM |
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| ZHANG Qi-rui,CHU Xue-lei.THE STRATIGRAPHIC CLASSIFICATION AND CORRELATION OF THE JIANGKOU GLACIATION IN THE YANGTZE BLOCK AND THE STRATOTYPE SECTION OF THE NANHUAN SYSTEM[J].Journal of Stratigraphy,2006,30(4):306-314. |
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| Authors: | ZHANG Qi-rui CHU Xue-lei |
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| Institution: | Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029 |
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| Abstract: | The Yangtze Block of South China is one of the important regions in the world where the Neoproterozoic glacial rocks are well developed and well studied. However, because of historical reasons the existing stratigraphic terms used in describing the glacial strata in the Yangtze Block need to be updated to reflect the greatly improved understanding of these rocks. In particular, the terms "Chang′an Glaciation" and "Fulu Interglacial" are not in accordance with new observations and interpretations. The application of these two terms is problematic, despite that they are still widely used. As a substitution, the terms "Jiangkou Group" and "Jiangkou Glaciation" are recommended, in which the Jiangkou Group comprises the Chang′an Formation, Fulu Formation, as well as Gucheng Member, Liangjiehe Member and other related units. Under such a scheme, the Jiangkou Glaciation can be well correlated with the Sturtian Glaciation in South Australia. |
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| Keywords: | Neoproterozoic glaciation Jiangkou Group Jiangkou Glaciation Gucheng Member Liangjiehe Member Nanhuan System stratotype section |
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