| 中国中新生代盐盆地的构造控制 |
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| 引用本文： | 袁见齐
,高建华.中国中新生代盐盆地的构造控制[J].地球科学,1987(4). |
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| 作者姓名： | 袁见齐 高建华 |
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| 作者单位： | Wuhan College of Geology，Wuhan 430074 |
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| 摘 要： | 中国中新生代盐盆地分布于东部沿海的裂陷裂谷、滇西的撞击裂谷、西北的多旋回褶皱山脉的山前带以及中部的陆内裂谷和断块的一侧,四种不同构造环境中盐类矿床也各有特点.盐盆地构造控制影响了盆地的活动性和盐类物质的多源性,而这些情况在时间和空间上并不限于本文所讨论的范围。
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| 关 键 词： | 构造控制 盆地系 盆地群 次盆地 同生断层 中-新生代 多源性 |
STRUCTURAL CONTROL OF MESO-CENOZOIC SALT BASIN IN CHINA |
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| Yuan Jianqi Gao Jianhua.STRUCTURAL CONTROL OF MESO-CENOZOIC SALT BASIN IN CHINA[J].Earth Science-Journal of China University of Geosciences,1987(4). |
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| Authors: | Yuan Jianqi Gao Jianhua |
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| Abstract: | The role played by geological structures is one of the recent advances in the genesis of salt deposition, and more attention is paid especially to the development of rift. Meso-Cenozoic salt basins spread widely in Chinese territory, and their relation with rift and block fault is discussed briefly in this paper.
Structural control of recent salt lake is known in West China, where neo-tectonic movement is active. Chaidam basin, the famous basin with large salt lakes, is controlled by deep faults on the north, south and west sides. High angle reversed faults divide the lakes in the basin into groups, and systems of minor faults control individual lakes. Likely, it is known that 390 salt lakes in North Tibet plateau are formed under the control of three parallel reversed fault zones of latitudinal trend and eight grabens of longitudinal elongation.
Salt deposits in Meso-Cenozoic basins are found in four regions, with characteristics quite different from each other: in east provinces along the coast, 29 salt basins scatter in a belt extending from North China to the side of South China Sea, where salt was deposited in basins controlled by normal faults in the taphrogen rift formed on the margin of the passive plate of Asia.In West Yunnan province, salt basins of Paleocene Epoch are developed in the impactogen rift, with reversed and thrust fault of different ages. In Northwest China, Meso-Cenozoic salt basins and intermontane basins of ranges of east-west trend are controlled by thrust faults. Another group of Meso-Cenozoic salt basins is formed in the middle part of Chinese territory, scattered in a belt from Helanshan in the north to central Yunnan, where Meso-Cenozoic salt basins are formed in intracontinental rift or along the down throw side of deep fault.
Geological structure, especially fault is one of the controlling factors of the history of formation and evolution of salt basin and environment of salt deposition. On the other hand, it is important for the origin of salt, whether it is the result of weathering of surface rock or rising from underground of various depth. At a result, the characteristics of Meso-Cenozoic salt deposits in China are quite different from those which have been suggested to be deposited in a quiet, shallow basin, like lagoon or desert basin.The significance of structural control of Meso-Cenozoic salt basin may concluded as follows: ( 1 ) the unstability of the basin, and ( 2 ) the multiple source of salt material. These may be of profound interest not only for Meso-Cenozoic salt basin as stated in this paper. |
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| Keywords: | structural control basin system basin group sub-basin contemporaneous fault Meso-Cenozoic multiple sourse |
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