晚古近纪柴达木盆地西南缘区域应力场演化——从其毗邻的阿达滩盆地得到的佐证
Tectonic Evolution of the Adatan Basin in Late Paleogene
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摘要: 柴达木盆地西南缘与之毗邻的阿达滩盆地对周边造山带构造应力场的变化响应敏感,并有较多的地质记录.中新生代以后,其与阿尔金断裂带同处于统一左行走滑剪切应力场作用之下,构造形迹保存较好.通过对盆地内沉积建造、断裂系性质及区域构造特征的识别分析,推断柴达木盆地西南缘在始新世时构造活动处于南北向挤压环境,而渐新世后则转换为左行平移构造应力之下.推测柴达木西南缘在三维空间上应当存在着来自塔里木地块斜向上的推挤力.通过盆地沉积及构造序列分析,初步建立了该区晚古近纪构造运动阶段性演化模式.Abstract: The Adatan basin located on the southwestern margin of the Qaidam basin is sensitive to tectonic stress field of the orogenic belts in the surrounding areas and has abundant deformation records.The basin and the Altyn Tagh fault zone have been together under the unified left-lateral strike-slip shear stress and corresponding structures were generated and well-preserved since the middle Cenozoic.Through analysis of the sedimentary formation, properties of faults and regional structures in the basin, it can be inferred that the southwestern margin of Qaidam basin was under the S-N compression during Eocene and changed to left-lateral strike-slip stress in Oligocene.Also there probably was oblique push from the Tarim massif on the southwest margin of the Qaidam basin.Through deposit and structural sequence analysis in the basin, staged an evolution model of the Paleogene tectonic activities.
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Key words:
- Adatan basin /
- staged tectonic evolution /
- left-lateral strike-slip fault /
- Altyn Tagh /
- Oligocen
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