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一个韧性转换挤压带的变形分解作用:以阿尔金断裂带东段为例
引用本文:张建新,许志琴.一个韧性转换挤压带的变形分解作用:以阿尔金断裂带东段为例[J].地质论评,1998,44(4):348-356.
作者姓名:张建新  许志琴
作者单位:中国地质科学院地质研究所,中国地质科学院地质研究所,中国地质科学院地质研究所 北京,100037,北京,100037,北京,100037
基金项目:国家305项目(编号06—04专题)及中法“阿尔金山—祁连山构造演化及岩石圈剪切作用”合作项目成果
摘    要:变形构造研究显示阿尔金划分成具有近水平拉伸线理的韧性左行走滑变形域和具有陡角度倾伏拉伸线理的收缩变形域。在SS与PS之间的过渡区域还发现中等角度倾伏的拉伸线理。

关 键 词:断层  转换挤压带  变形分解作用  阿尔金断裂带

Deformation Partitioning of Ductile Transpressional Zones: an Example from the Eastern Segment of the Altun Fault Zone
Zhang Jianxin,Xu Zhiqin and Cui Junwen.Deformation Partitioning of Ductile Transpressional Zones: an Example from the Eastern Segment of the Altun Fault Zone[J].Geological Review,1998,44(4):348-356.
Authors:Zhang Jianxin  Xu Zhiqin and Cui Junwen
Abstract:Studies of deformation structure in the eastern segment of the Altun fault zone indicate that it can be divided into the ductile sinistral strike-slip domain with subhorizontal stretching lineations (SS domain) and the contractional deformation domain with steeply plunging stretching lineations (PS). Moderate-angle plunging stretching lineations can been also found locally between the SS domain and PS domain. In the SS domain lots of shear sense indicators show sinistral strike-slip, features, and pure shear strain indicators are seen locally in outcrops perpendicular to foliations. However,in the PS domain lots of pure shear strain indicators are found in outcrops perpendicular to foliations , and sinistral shear indicators can been seen locally in subhorizontal outcrops. The phenomena show that in the SS domain horizontal simple shear is dominant with some pure shear strain, but in the PS domain pure shear strain is dominant with some horizontal simple shear. Therefore, The eastern segment of the Altun fault zone may be considered as a transpressional deformation zone which resulted from oblique convergence between the Tarim block and Qaidam block. During the ductile transpressional deformation, the deformation was partitioned into the dominantly sinistral strike-slip domain and the dominantly horizontal shortening and vertical stretching domains. The former brough about lateral movement paralled to the strike of the Altun fault zone, while the latter resulted in shortening of the Altun zone, crustal thickening and mountain uplift.
Keywords:ductile sinistral strike-slip deformation domain  contractional deformation domain  transpressional zone  deformation partition  Altun fracture zone  
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