ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
龙门山逆冲带假玄武玻璃在其形成及后期抬升过程中的化学变化
  
关键词:pseudotachylyte  geochemical  µXRF  WFSD  Longmen Shan
基金项目:国家自然科学基金项目(编号: 41602226; 41830217);中国地质科学院基本科研业务费项目(编号: J1619; YYWF201601)
作者单位E-mail
王焕 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所 wanghuan4585@126.com 
李海兵 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所  
司家亮 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所  
张蕾 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所  
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摘要:
Geochemical Variations of the Pseudotachylytes during Their Formation and Subsequent Uplift Processes, in the Longmen Shan Thrust Belt
      Pseudotachylytes, as the product of the frictional melting during seismic slip, convey important information about the earthquake rupture in the fault zone, and provide crucial material for learning fault zone formation processes and their faulting activity history. As fault rocks drilled from the deep fault zone exempt the supergenetic physical-chemical weathering, their chemical properties should be much similar to those during their formation. In this paper, multiple generations of pseudotachylytes in southern Yingxiu–Beichuan fault were studied. Their chemical properties were analyzed using SEM, μXRF core scanner and M4 TORNADO. Microstructures show that the pseudotachylytes are of melt-origin. Results of geochemical analysis indicate that the melts were formed in a high temperature reductive environment, characterized by high Fe, Ti, K, low Si with high magnetic susceptibility. The chemical properties of the surface pseudotachylytes were significantly changed due to the supergenetic weathering processes. Different elemental features of the multiple generations of pseudotachylytes in the WFSD drilling cores also indicate that the meteoric water (atmospheric water and surface water) had injected into 585 m or greater depth along the fault zone. Therefore, the geochemical variations should be taken into consideration when pseudotachylyte is used to judge the instantaneous sliding environment of seismic slip.
WANG Huan,LI Hai-bing,SI Jia-liang,ZHANG Lei.2019.Geochemical Variations of the Pseudotachylytes during Their Formation and Subsequent Uplift Processes, in the Longmen Shan Thrust Belt[J].Acta Geoscientica Sinica,40(1):199-211.
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