柴达木西缘地区存在一组北北西-南南东向断裂构造的重力场证据
The gravity field evidence of the existence of a group of NNW-SSE trending fracture structures on the western margin of Qaidam Basin
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摘要: 提要：柴达木西缘地区靠近阿尔金造山带与昆仑造山带的结合部位，构造运动非常复杂。通过对最新取得的1:25万区域重力数据进行研究，发现在这一地区除了北东东向的阿尔金断裂带及以昆南、昆中、昆北断裂为代表的一组北西西-近东西向断裂带外，还存在一组北北西-南南东向断裂构造。本文介绍了这组北北西-南南东向断裂构造存在的重力场证据，对其特征和成因进行了分析和初步探讨，认为这是一组断距不大、延伸很长、切穿了北东东向及北西西-近东西向断裂带的高角度右行走滑断裂，是一组较新的断裂构造，其成因可能主要与青藏高原整体的北东向位移有关。这一新的发现有可能会对柴达木西缘地区构造运动（尤其是新构造运动）的认识及这一地区的矿产研究产生一定的影响。
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关键词:
- 柴达木西缘 /
- 北北西-南南东向断裂构造 /
- 重力场 /
- 证据
Abstract: Abstract：The western margin area of Qaidam Basin is close to the juncture between Altun orogen and Qimantag orogen of East Kunlun, where the tectonic movement is very complex. Based on a study of the newest data obtained from 1∶250000 gravity survey, the authors recognized a group of new NNW-SSE trending faulted structures, in addition to NEE-trending Altun fractures and NWW-nearly EW-trending South Kunlun, Central Kunlun and North Kunlun fractures. In this paper, the authors provided gravity evidence for the existence of a group of NNW-SSE trending fractures in this region. Based on an analysis of their characteristics and origins, the authors consider that these fractures are a group of newly rifted strike-slip structures, which have high-angle right-lateral fractures characterized by small fault displacement and long stretches, and they pass through the high-angle right-lateral fractures, belonging to a group of NEE and NWW-nearly EW trending fault zones. Further studies show that these fractures are a group of new faulted zones related genetically to NE-trending movement of the whole Tibetan Plateau. The new findings may have some significance for the understanding of the tectonic movement (especially the new tectonic movement ) and the mineral research in Qaidam western margin area. -
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