Skip to main content

Cathodoluminescence and fluid inclusion analyses of mineral veins within major thrusts in the Shimanto accretionary complex: evidence of hydraulic fracturing during thrusting

Abstract

To elucidate fluid-rock interaction in a seismogenic zone along a plate-subduction boundary, we investigated the occurrence of mineral veins within the major thrusts in the Shimanto accretionary complex and examined their microstructures using a cathodoluminescence technique. We found discriminative structures, for example, a jigsaw-puzzle structure, within the quartz veins in the thrusts, which could indicate that hydraulic fracturing occurred by abnormal pore-fluid pressure during thrusting. Pore pressure values, estimated quantitatively by fluid inclusion analyses, were 3–27 MPa higher than the surrounding parts, which may be direct evidence of abnormal pore-fluid pressure. High pore-fluid pressures and subsequent hydraulic fracturing may play an important role within major thrusts along a plate-subduction boundary.

References

  • Brown, P. E., FLINCORE: A microcomputer program for the reduction and investigation of fluid-inclusion data, Am. Mineral., 74, 1390–1393, 1989.

    Google Scholar 

  • Burruss, R. C., Analysis of phase equilibria in C-O-H-S fluid inclusions: Mineral Association of Canada Short Course Handbook, 6, 138–156, 1981.

    Google Scholar 

  • Ikesawa, E., A. Sakaguchi, and G. Kimura, Pseudotachylyte from an ancient accretionary complex: Evidence for melt generation during seismic slip along a master decollement?, Geology, 31, 637–640, 2003.

    Article  Google Scholar 

  • Ikesawa, E., G. Kimura, K. Sato, K. Ikehara-Ohmori, Y. Kitamura, A. Yamaguchi, K. Ujiie, and Y. Hashimoto, Tectonic incorporation of the upper part of oceanic crust to overriding plate of a convergent margin: An example from the Cretaceous-early Tertiary Mugi Mélange, the Shimanto Belt, Japan, Tectonophysics, 401, 217–230, 2005.

    Article  Google Scholar 

  • Kimura, G. and A. Mukai, Underplated units in an accretionary complex: Melange of the Shimanto Belt of eastern Shikoku, southwest Japan, Tectonics, 10, 31–50, 1991.

    Article  Google Scholar 

  • Kitamura, Y., K. Sato, E. Ikesawa, K. Ohmori-Ikehara, G. Kimura, H. Kondo, K. Ujiie, C. T. Onishi, K. Kawabata, Y. Hashimoto, H. Mukoyoshi, and H. Masago, Melange and its seismogenic roof decollement: A plate boundary fault rock in the subduction zone-An example from the Shimanto Belt, Japan, Tectonics, 24, TC5012, doi:10.1029/2004TC001635, 2005.

    Article  Google Scholar 

  • Kumon, F., Shimanto Supergroup in the southern part of Tokushima Prefecture, Southwest Japan, J. Geol. Soc. Jpn., 87, 277–295, 1981.

    Article  Google Scholar 

  • Moore, J. C., Tectonics and hydrogeology of accretionary prisms: role of the decollement zone, J. Struct. Geol., 11, 95–106, 1989.

    Article  Google Scholar 

  • Mukoyoshi, H., A. Sakaguchi, K. Otsuki, T. Hirono, and W. Soh, Co-seismic frictional melting along an out-of-sequence thrust in the Shimanto accretionary complex: Implications on the tsunamigenic potential of splay faults in modern subduction zones, Earth Planet. Sci. Lett., 245, 330–343, 2006.

    Article  Google Scholar 

  • Mullis, J., The system methane-water as a geologic thermometer and barometer from the external part of the central Alps, Bull. Mineral., 102, 526–536, 1979.

    Google Scholar 

  • Onishi, C. T. and G. Kimura, Change in fabric of melange in the Shimanto Belt, Japan: Change in relative convergence?, Tectonics, 14, 1273–1289, 1995.

    Article  Google Scholar 

  • Sakaguchi, A., High paleogeothermal gradient with ridge subduction beneath the Cretaceous Shimanto accretionary prism, Southwest Japan, Geology, 24, 795–798, 1996.

    Article  Google Scholar 

  • Saxena, S. K. and Y. Fei, Fluids at crustal pressure and temperatures, I: pure species, Contrib. Mineral. Petrol., 95, 370–375, 1987.

    Article  Google Scholar 

  • Taira, A., M. Tashiro, M. Okamura, and J. Katto, The geology of the Shimanto Belt in Kochi Prefecture, Shikoku, Japan, in Geology and Paleontology of the Shimanto Belt, edited by A. Taira and M. Tashiro, Rinyakosaikai Press, Kochi, 319–389, 1980.

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Hideki Mukoyoshi.

Rights and permissions

Open Access  This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/.

Reprints and Permissions

About this article

Cite this article

Mukoyoshi, H., Hirono, T., Sekine, K. et al. Cathodoluminescence and fluid inclusion analyses of mineral veins within major thrusts in the Shimanto accretionary complex: evidence of hydraulic fracturing during thrusting. Earth Planet Sp 59, 937–942 (2007). https://doi.org/10.1186/BF03352032

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03352032

Key words

  • Hydraulic fracturing
  • seismogenic zone
  • cathodoluminescence
  • Shimanto accretionary complex