| 试论黔西北及邻区非海相三叠系/侏罗系界线 |
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| 引用本文： | 王立亭. 试论黔西北及邻区非海相三叠系/侏罗系界线[J]. 贵州地质, 2002, 19(3): 175-178,162 |
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| 作者姓名： | 王立亭 |
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| 作者单位： | 贵州省地质矿产勘查开发局,贵州,贵阳,550004 |
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| 摘 要： | 根据黔西北及邻区二桥组中双壳类的垂直分布,可将其分为两个组合;下部Indosinion-Permophorus组合及上部Qiyangia-Hunanella组合。前一组合的时代为晚三叠世瑞替克期,后一组合的时代则为早侏罗世早中期。该区非海相三叠系／侏罗系的界线应划在上述两个组合之间。故该区二桥组实为跨三叠系与侏罗系的岩石地层单位。
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| 关 键 词： | 三叠系/侏罗系界线 黔西北 二桥组 |
| 文章编号： | 1000-5943(2002)03-0175-04 |
Initial Discussion on the Boundary of the Triassic-Jurassic of the Non-marine facies in Northwest Guizhou and Its Adjacent Areas |
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| WANG Li-ting. Initial Discussion on the Boundary of the Triassic-Jurassic of the Non-marine facies in Northwest Guizhou and Its Adjacent Areas[J]. Guizhou Geology, 2002, 19(3): 175-178,162 |
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| Authors: | WANG Li-ting |
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| Abstract: | According to the vertical distribution of the bivalve within Erqiao formation in northwest Guizhou and its adjacent areas, two assemblages of bivalve may be sorted, namely the upper Indosinion-Permophorus assemblage and the lower Qiyangia-Hunanella assemblage. The age of former is in Rhaetian Stage of the Triassic, and the latter is in nonage of the early Jurassic. The boundary of the Triassic-Jurassic of the non-marine facies should be divided between the two assemblages and accordingly the Erqiao formation is the lithostratigraphic unit in nature, which crosses over the Triassic and Jurassic. |
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| Keywords: | Boundary of the Trassic-Jurassic northwest Guizhou Erqiao formation |
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