新疆和田凹陷重力场与构造特征
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摘要
目的研究和田凹陷的构造特征。方法综合区域地质、地震等研究成果对实测重力资料进行定性及定量拟合计算,确定研究区发育地层及断层的分布特征。结果研究区山前及以南地区发育4条NWW向逆冲断裂,它们组成山前叠瓦式逆冲断裂系;和田凹陷发育的盖层为原地系统,推覆前缘断褶带内为双层结构,上部为外来系统,下部为原地系统。结论研究区发育地层呈NWW(EW)向,局部构造主要发育于和田断裂与铁克里克北缘断裂之间;山前推覆构造由南向北依次为根带、第二冲断席、第一冲断席、前陆盆地变形微弱盖层,推覆构造在中新世—更新世期间形成。
Aim To study the tectonic feature at Hetian depression.Methods Through the qualitative and quantitative fit computation for gravity data observed synthetized regional geological and seismic research achievements concerned,confirm the distribution feature of fault and stratum developed in the study area.Results 4 thrust faults in NWW direction developed,which composed the imbricated thrust fault system in the piedmont and the southern part of the study area.The cover layer in Hetian depression is an autochthonous system,it′s the duplex-layer structure in the fault-folding belt at the front of the trust nappe,the upper is an allochthonous system and the lower is an autochthonous system.Conclusion The strata developed are in NWW(EW)direction in the area,the local structures developed are mainly between Hetian fault and Tiekelike fault.The nappe structure are the root zone,the second thrust sheet,the first thrust sheet and the foreland basin weak-deformed cover layer from south to north respectively.The thrust structure was formed in the period of Miocene and Pleistocene.
Aim To study the tectonic feature at Hetian depression.Methods Through the qualitative and quantitative fit computation for gravity data observed synthetized regional geological and seismic research achievements concerned,confirm the distribution feature of fault and stratum developed in the study area.Results 4 thrust faults in NWW direction developed,which composed the imbricated thrust fault system in the piedmont and the southern part of the study area.The cover layer in Hetian depression is an autochthonous system,it′s the duplex-layer structure in the fault-folding belt at the front of the trust nappe,the upper is an allochthonous system and the lower is an autochthonous system.Conclusion The strata developed are in NWW(EW)direction in the area,the local structures developed are mainly between Hetian fault and Tiekelike fault.The nappe structure are the root zone,the second thrust sheet,the first thrust sheet and the foreland basin weak-deformed cover layer from south to north respectively.The thrust structure was formed in the period of Miocene and Pleistocene.
引文
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[3]胡建中,谭应佳,张平,等.塔里木盆地西南缘山前带逆冲推覆构造特征[J].地学前缘,2008,15(2):222-231.
[4]王世虎,徐希坤,宋国奇.塔西南拗陷和田凹陷前陆逆冲带构造特征[J].石油实验地质,2001,23(4):378-383.
[5]乔日新,张用夏.高精度航空磁测在塔里木盆地油气勘查中的几点新认识[J].物探与化探,2002,26(5):334-339.
[6]崔建堂,边小卫,王根宝.西昆仑地质组成与演化[J].陕西地质,2006,24(1):1-11.
[7]孙海田,李纯杰,李锦平,等.新疆昆仑式火山岩型块状硫化物铜矿床及成矿地质环境[J].矿床地质,2004,23(1):82-92.
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