Vitrinite reflectance and Raman spectra of carbonaceous material as indicators of frictional heating on faults; constraints from friction experiments

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doi: 10.1016/j.epsl.2015.05.037
Author(s): Furuichi, Hiroyuki; Ujiie, Kohtaro; Kouketsu, Yui; Saito, Tsubasa; Tsutsumi, Akito; Wallis, Simon
Author Affiliation(s): Primary:
University of Tsukuba, Graduate School of Life and Environmental Sciences, Tsukuba, Japan
Nagoya University, Japan
Kyoto University, Japan
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, Vol.424, p.191-200. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. Includes appendices. 48 refs.; illus., incl. sect., 1 table, sketch map
Summary: Vitrinite reflectance (Ro) and Raman spectra of carbonaceous material (RSCM) are both widely used as indicators of the maximum attained temperatures in sedimentary and metamorphic rocks. However, the potential of these methods to estimate temperature increases associated with fault slip has not been closely studied. To examine this issue, friction experiments were conducted on a mixture of powdered clay-rich fault material and carbonaceous material (CM) at slip rates of 0.15 mm/s and 1.3 m/s in nitrogen (N2) gas with or without distilled water. After the experiments, we measured Ro and RSCM and compared to those in starting material. The results indicate that when fault material suffers rapid heating at >500 °C in ∼9 s at 1.3 m/s, Ro and the intensity ratio of D1 and D2 Raman bands of CM (ID2/ID1) markedly increase. Comminution with very small temperature rise in ∼32 min at 0.15 mm/s is responsible for very limited changes in Ro and ID2/ID1. Our results demonstrate that Ro and RSCM could be useful for the detection of frictional heating on faults when the power density is ≥0.52 MW/m2. However, the conventionally used Ro and RSCM geothermometers are inadequate for the estimation of peak temperature during seismic fault slip. The reaction kinetics incorporating the effects of rapid heating at high slip rates and studies of the original microtexture and composition of CM are required to establish a reliable thermometer for frictional heating on faults. Abstract Copyright (2015) Elsevier, B.V.
Year of Publication: 2015
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 16 Structural Geology; Carbonaceous composition; Clay minerals; Comminution; Displacements; Experimental studies; Faults; Friction; Geologic thermometry; Gouge; Heating; IODP Site C0002; IODP Site C0004; Integrated Ocean Drilling Program; Kumano Basin; Microstructure; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; Raman spectra; Shear; Sheet silicates; Silicates; Slip rates; Spectra; Temperature; Vitrinite reflectance; West Pacific
Coordinates: N331800 N331801 E1363801 E1363800
N331300 N331300 E1364300 E1364300
Record ID: 2015088655
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands