| 磷灰石裂变径迹分析在恢复盆地沉降抬升史中的应用──以鄂尔多斯盆地为例 |
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| 引用本文： | 赵孟为.磷灰石裂变径迹分析在恢复盆地沉降抬升史中的应用──以鄂尔多斯盆地为例[J].地球物理学报,1996,39(Z1):237-248. |
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| 作者姓名： | 赵孟为 |
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| 作者单位： | 哥廷根大学地质与岩石圈动力学研究所, 德国哥廷根 |
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| 摘 要： | 对鄂尔多斯盆地磷灰石裂变径迹资料深入分析表明．最迟２３Ｍａ以来盆地发生了一期由于快速抬升剥蚀引起的冷却事件．盆地东部以９５ｍ／Ｍａ的速率抬升，造成约２０００ｍ的剥蚀量；而盆地西部则以５６ｍ／Ｍａ的速率抬升，导致了约１０００ｍ的剥蚀量．盆地东、西部的差异抬升剥蚀导致了盆地现今微微西倾的构造面貌．这一抬升剥蚀事件是印度板块与欧亚板块碰撞引起亚洲构造运动形式以挤压为主，转换为中新世以来以地壳增厚为主的结果．Ｋ－Ａｒ年龄和镜质体反射率资料分析表明，盆地在１７０－１６０Ｍａ（中侏罗末）曾发生一期热事件，使古地温梯度达５７℃／ｋｍ，古热流值达９６－１０９ｍｗ／ｍ２．
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| 关 键 词： | 磷灰石裂变径迹 沉降抬升史 冷却事件 热事件 鄂尔多斯盆地 |
| 收稿时间： | 1995-11-15 |
THE APPLICATION OF APATITE FISSION TRACK ANALYSIS TO THE RECONSTRUCTION OF THE SUBSIDENCE AND UPLIFT HISTORY OF SEDIMENTARY BASINS:A CASE STUDY FROM THE ORDOS BASIN |
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| ZHAO MENG-WEI.THE APPLICATION OF APATITE FISSION TRACK ANALYSIS TO THE RECONSTRUCTION OF THE SUBSIDENCE AND UPLIFT HISTORY OF SEDIMENTARY BASINS:A CASE STUDY FROM THE ORDOS BASIN[J].Chinese Journal of Geophysics,1996,39(Z1):237-248. |
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| Authors: | ZHAO MENG-WEI |
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| Institution: | Institute of Geology and Dynamics of Lithosphere, University of Gottingen, Germany |
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| Abstract: | Combining With vitrinte reflectance and K-Ar data, the further analyses of the apatite fission track data from the Ordos Basin indicate that a cooling event occurred due to a rapid uplift and erosion at least since 23 Ma in the basin. The eastern basin was uplifted at a rate of ￣95 m/Ma, resulting in an erosion of～2 000m, wherease the western basin was rised at a rate of￣56m/Ma, leading to an unroofing of～1000 m.It was the differential uplift and erosion since the Miocene that caused the gentle inclination of the strata to the west and therefore,the regional deformation and present structural pattern of the basin. The Miocene uplift or cooling event in the Ordos Basin was a distant effect of the major shift from extrusion-dominated to crustal thickening-dominated tectonics during the development of the India-Asia collision.Vitrinite reflectance and K-Ar age data suggest that a thermal event of 170-160 Ma took place and a paleogthermal gradient of 57℃/km and a heat flow of 96-109 mW/m2 could be reached. This thermal event is thought to be related to a subsurface intrusion of magmatic bodies during the early Yanshanian movement. |
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| Keywords: | Apatite fission track analysis Thermal event Cooling event Subsidence and uplift history Ordos Basin |
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