Origin and formation of carbonaceous material veins in the 2008 Wenchuan earthquake fault zone

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• 作者：Jiang Liu ; Haibing Li ; Jinjiang Zhang ; Bo Zhang
• 关键词：Carbonaceous material vein ; Origin ; Formation ; Wenchuan earthquake fault zone
• 刊名：Earth, Planets and Space
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：68
• 期：1
• 全文大小：3,062 KB
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• 作者单位：Jiang Liu (1)
  Haibing Li (2)
  Jinjiang Zhang (3)
  Bo Zhang (3)
  
  1. Xi’an Center of Geological Survey, CGS, Key Laboratory of the Study of Focused Magmatism and Giant Ore Deposits, MLR, Xi’an, 710054, China
  2. Key Laboratory of Continental Tectonics and Dynamics, MLR, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China
  3. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing, 100871, China
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

This paper establishes a reference data set of carbonaceous materials (CMs) from the active fault zone of the Longmen Shan fault belt that ruptured in the 2008 Mw7.9 Wenchuan earthquake and presents an application of these data for studies of both other exhumed carbonaceous-rich fault zones and deep-drilling cores. The CMs distributed in the active fault zone are found as narrow veins and located along the slip surfaces. Microstructural observation shows that the carbonaceous material veins (CMVs) are located along slip surfaces in the fault gouge zones. Some CMVs have a cataclastic fabric, and their branches intrude into voids around the slip surfaces. Raman spectra of the CMVs show a wide (full width at half maximum >200 cm−1) D-peak at ~1345 cm−1 (defect peak), which is much lower than the O-peak at ~1595 cm−1 (ordered peak), indicating a metamorphic temperature of zeolite facies or lower than 250 °C. In addition, the stable carbon isotopic compositions (δ13C values) of the CMVs, ranging from −23.4 to −26.4‰, are very similar to that of the kerogen collected from the Late Triassic Xujiahe Formation in Sichuan Basin. Given the data at which it may be formed, the Xujiahe Formation is the most likely origin of CMs for the CMVs, and it seems that some CMVs in the fault zone were crushed and intruded into the voids during coseismic events, possibly driven by an enhanced pore fluid pressure. Since graphitization is suggested as an indicator of transient frictional heating in this area, our study providing a reference data set of CMs would help future CM-rich fault-zone research to retrieve seismic signatures presumably occurring in the Longmen Shan fault zone belt. Keywords Carbonaceous material vein Origin Formation Wenchuan earthquake fault zone