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Minerals 2018, 8(9), 385; https://doi.org/10.3390/min8090385

Carbonaceous Materials in the Fault Zone of the Longmenshan Fault Belt: 1. Signatures within the Deep Wenchuan Earthquake Fault Zone and Their Implications

1
Department of Earth Sciences, National Central University, Taoyuan 320, Taiwan
2
Department of Earth Sciences, National Taiwan Normal University, Taipei 106, Taiwan
3
National Taiwan Museum, Taipei 100, Taiwan
4
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
5
Department of Geosciences, National Taiwan University, Taipei 106, Taiwan
*
Author to whom correspondence should be addressed.
Received: 22 June 2018 / Revised: 3 September 2018 / Accepted: 3 September 2018 / Published: 4 September 2018
(This article belongs to the Special Issue Mineralogy of Natural Graphite)
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Abstract

Graphitization of carbonaceous materials (CM) has been experimentally demonstrated as potential evidence of seismic slip within a fault gouge. The southern segment of the Longmenshan fault, a CM-rich-gouge fault, accommodated coseismic slip during the 2008 Mw 7.9 Wenchuan earthquake and potentially preserves a record of processes that occurred on the fault during the slip event. Here, we present a multi-technique characterization of CM within the active fault zone of the Longmenshan fault from the Wenchuan earthquake Fault Scientific Drilling-1. By contrast with field observations, graphite is pervasively and only distributed in the gouge zone, while heterogeneously crystallized CM are present in the surrounding breccia. The composite dataset that is presented, which includes the localized graphite layer along the 2008 Wenchuan earthquake principal slip zone, demonstrates that graphite is widely distributed within the active fault zone. The widespread occurrence of graphite, a seismic slip indicator, reveals that surface rupturing events commonly occur along the Longmenshan fault and are characteristic of this tectonically active region. View Full-Text
Keywords: graphitization; graphite; Longmenshan fault; Wenchuan earthquake; WFSD-1 graphitization; graphite; Longmenshan fault; Wenchuan earthquake; WFSD-1
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kuo, L.-W.; Huang, J.-R.; Fang, J.-N.; Si, J.; Li, H.; Song, S.-R. Carbonaceous Materials in the Fault Zone of the Longmenshan Fault Belt: 1. Signatures within the Deep Wenchuan Earthquake Fault Zone and Their Implications. Minerals 2018, 8, 385.

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