| 塔里木盆地顺托果勒地区早中志留世震积岩——高分辨构造事件的记录 |
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| 关键词:soft-sediment deformation structures seismites high-resolution paleo-earthquake events Early and Middle Silurian Shuntuoguole area Tarim Basin |
| 基金项目:中石化西北分公司科研项目(编号: KY2013-S-024);中国地质调查局项目(编号: 12120115002001; 12120115026901);国土资源部行业基金项目(编号: 201011034);国家自然科学创新团队基金(编号: 40921001) |
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| Seismites in the Early and Middle Silurian Strata of Shuntuoguole Area in Tarim Basin: Records of High-resolution Tectonic Events |
| A lot of soft-sediment deformation structures (SSDS) in deep drilling cores are recognized in the Early and Middle Silurian strata of the Shuntuoguole area which is a conjunction of the Tazhong uplift and the Manjiaer depression in the Tarim Basin. The SSDS include liquefied sand veins, liquefied breccias, thixotropic diapirs, thixotropic wedges, load cast structures, ball - pillow structure deformation structures and complex plunge sediment mixture structures. The lithological composition, the structural morphologies and styles, the sequences of vertical distribution, the extensions of horizontal distributions and the sedimentary envoirment of soft sediment deformation structures are analyzed, and the relationship between the activity of the paleo-faults to the SSDS are discussed. These soft-sediment deformation structures are determined as various seismites. Combined with the faults in the Early and Middle Silurian strata in this area and adjacent areas, the authors hold that the seismogenic faults may be mainly the NE-trending strike-slip thrust faults and the smaller NW-trending extensional faults. There occurred at least 26 times paleo-earthquake events (with magnitude more than 5) during about 4 Ma of the deposition of the Kepingtagh Formation in Early Silurian. These paleo-earthquake records reflect the tectonic activities of Shuntuoguole area and its adjacent areas, complement the evidence of high-resolution tectonic events of the main tectonic movements with the pulsation and circularity, and provide the new clues for reconstruction of paleo-tectonics. |
| YU Zhuo-ying,HE Bi-zhu,QIAO Xiu-fu,JIAO Cun-li,CAO Zi-cheng,WANG Zhen,CHEN Wei-wei,LIU Shi-lin,QIU Hua-biao,YUE Xin-dong.2016.Seismites in the Early and Middle Silurian Strata of Shuntuoguole Area in Tarim Basin: Records of High-resolution Tectonic Events[J].Acta Geoscientica Sinica,37(3):313-325. |
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