银川地堑东缘中新生代隆升时限--来自裂变径迹的证据
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西北大学地质学系

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(42072170,42230815)资助


Time limit of Mesozoic and Cenozoic uplift in the eastern margin of Yinchuan graben:evidence from fission track
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1.State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'2.'3.an 710069, China;4.State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi&5.amp;6.#39;7.&8.an;9.State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'

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    摘要:

    银川地堑东缘位于鄂尔多斯盆地西缘构造带北段,处于阿拉善地块、鄂尔多斯地块及活动性强烈的秦祁褶皱带的相接部位,中新生代经历了多期构造活动,其构造隆升对周缘地区构造演化研究及油气勘探意义重大。本文通过银川地堑东缘不同地区、不同层位磷灰石和锆石裂变径迹年龄、长度特征及热史模拟分析,结合构造特征和地层接触关系,指出研究区至少经历了晚侏罗世(160~145Ma)、晚白垩世(100~70Ma)、中新世早期(22~20Ma)和中新世晚期以来(10~8Ma)四期明显的隆升活动。不同时期、不同地区隆升特征具有一定差异性,中生代北部和南部地区隆升启动较早(早/中侏罗世),具有由南北部向中部逐渐隆升的趋势,晚侏罗世中部隆升速率高于南北部,晚白垩世为整体缓慢隆升,而中新世以来的隆升表现为南早北晚、隆升速率向北增加的特征。这种隆升期次和差异隆升特征均具有相应的地质响应和区域动力机制。

    Abstract:

    The eastern margin of Yinchuan Graben is located in the northern part of the structural belt on the western margin of Ordos Basin, at the junction of Alashan Block, Ordos Block and Qinqi Fold Belt with strong activity. The Mesozoic and Cenozoic have experienced multi-stage structural activities, and its structural uplift is of great significance to the study of structural evolution and oil and gas exploration in the surrounding areas. Based on the age, length characteristics and thermal history simulation analysis of apatite and zircon fission tracks in different areas and horizons in the eastern margin of Yinchuan Graben, combined with structural characteristics and stratigraphic contact relationship, this paper points out that the study area has experienced at least Late Jurassic (160~145Ma), Late Cretaceous (100~70Ma), Early Miocene (22~20Ma) and Late Miocene (10~8Ma). There are some differences in uplift characteristics in different periods and regions. The uplift in the northern and southern parts of Mesozoic started earlier (early/middle Jurassic), and it gradually uplifted from the north and south parts to the middle part. The uplift rate in the middle part of late Jurassic was higher than that in the north and south parts, and the whole uplift was slow in the late Cretaceous. Since Miocene, the uplift has been characterized by early south and late north, and the uplift rate increased northward. This uplift period and differential uplift characteristics have corresponding geological response and regional dynamic mechanism.

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  • 收稿日期:2024-07-31
  • 最后修改日期:2024-10-03
  • 录用日期:2024-10-28
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