| 柴达木盆地北缘晚海西—印支期古构造应力分析 |
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| 关键词:northern margin of the Qaidam Basin Late Hercynian-Indosinian period tectonic features stratigraphic recovery paleotectonic stress inversion compressive stress direction |
| 基金项目:中国地质调查局地质调查项目“柴达木盆地油气资源潜力评价”(编号: 1212010818054);“柴达木盆地古生代油气资源调查评价”(编号: 1212011120964) |
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| An Analysis of Late Hercynian–Indosinian Paleotectonic Stress on the Northern Margin of the Qaidam Basin |
| In order to investigate the Late Hercynian-Indosinian paleotectonic stress characteristics and tectonic evolution on the northern margin of the Qaidam Basin, the authors analyzed the data of Carboniferous-Cenozoic tectonic features obtained in Kuairimaxiang, Chengqianggou, Shihuigou and some other areas by using stratigraphic recovery and paleotectonic stress inversion techniques. Under the influence of SN compression, the north margin of Qaidam underwent northward subduction, collision and denudation in the Late Permian–Middle Triassic period. From the Late Triassic, the collision between western Qinling and Qaidam caused the change of the orientation of the compressive stress into NW-SE, which resulted in the considerable loss of the Upper Triassic strata and local deposition of the Upper Triassic conglomerate on the northern margin of the Qaidam Basin. An analysis shows that voluminous denudation of the Permian-Triassic strata and the angular unconformity between Cretaceous and Carboniferous strata in Gahainanshan area and between Jurassic and Carboniferous strata in Wanggaxiu area caused by strong compression might indicate the destruction of the underlying Carboniferous strata in Late Hercynian-Indosinian period. |
| PENG Yuan,MA Yin-sheng,LIU Cheng-lin,SUN Jiao-peng,CHENG Hai-yan,DAI Kun,ZHENG Ce.2015.An Analysis of Late Hercynian–Indosinian Paleotectonic Stress on the Northern Margin of the Qaidam Basin[J].Acta Geoscientica Sinica,36(1):51-59. |
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