| 青海茫崖地区中—下侏罗统植物化石与时代讨论 |
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| 引用本文： | 张发德,童海奎.青海茫崖地区中—下侏罗统植物化石与时代讨论[J].西北地质,2012,45(1):86-93. |
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| 作者姓名： | 张发德 童海奎 |
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| 作者单位： | 1. 青海煤炭地质物探测量队,青海西宁,810001
2. 青海省国土资源勘查项目管理中心,青海西宁,810001 |
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| 基金项目： | 中国地质调查局地质大调查项目“青海省地质调查综合研究”(1212010918044) |
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| 摘 要： | 青海茫崖地区侏罗系是柴达木盆地北缘含煤岩系的西北延伸部分,地处阿尔金山南麓山前坳陷.青海省煤田地质区划将其称为格斯煤田,中一下侏罗统是本区唯一的含煤地层.对植物化石组合1及植物化石组合2进行了种属和组合特征分析研究,通过与邻区生物地层的对比分析,植物化石组合1与枝脉蕨顶峰带(Cladophlebis Acme Zone)植物组合类似,时代大体相当于普林斯巴赫期.植物化石组合2与锥叶蕨顶峰带(Coniopteris Acme Zone)可进行对比,地质时代为巴柔—巴通期.通过对茫崖地区基本地层层序与植物化石组合的分析研究,进一步对该区成煤地质时代进行了讨论.
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| 关 键 词： | 茫崖 植物化石 普林斯巴赫期 巴柔一巴通期 |
Discussion of Plants Fossils and Its Geological Ages of the Lower-Middle Jurassic in Mangya Area, Qinghai Province |
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| ZHANG Fa-de
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TONG Hai-kui.Discussion of Plants Fossils and Its Geological Ages of the Lower-Middle Jurassic in Mangya Area, Qinghai Province[J].Northwestern Geology,2012,45(1):86-93. |
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| Authors: | ZHANG Fa-de TONG Hai-kui |
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| Institution: | 1.Qinghai Coalfield Geology and Geophysical Prospecting Entity,Xining 810001,China;2.Qinghai Project Management Center for Land and Resources Exploration,Xining 810001,China) |
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| Abstract: | The Jurassic in the Mangya area is the northwestern outspread part of the coal-bearing series of the northern Qaidam basin in Qinghai province.This area is located at the depression in front of the southern Altun mountain,and is named the Gus coalfield in the Qinghai coal geology zonation.The Lower-Middle Jurassic in this area is the only coal-bearing strata.The characteristics of the genera and species and their combinations of the plant fossil assemblage 1 and 2 were analyzed.Through biostratigraphic correlation with neighboring areas,the ages of two fossil assemblages were determined.Fossil combination 1 is analogous to the Cladophlebis Acme Zone,and its geological age is roughly equivalent to the Pliensbachian.Fossil assemblage 2 is analogous to Coniopteris Acme Zone,and its geological age is equivalent to the Bajocian-Bathonian.The coal-forming periods in this area is further discussed based on these analyses of basic stratigraphic sequence and fossil assemblages. |
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| Keywords: | Mangya plant fossils Pliensbachian Bajocian-Bathonian |
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