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Pseudotachylyte from an ancient accretionary complex: Evidence for melt generation during seismic slip along a master décollement?

¹ Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan
² Institute of Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan
³ Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan, and Institute of Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan

Pseudotachylyte is present in the Shimanto accretionary complex in Shikoku, Japan. The pseudotachylyte occurs as a vein in a fault zone and displays flow structure, TiO₂ microlites, and other melting-related textures. The mineral assemblage of the pseudotachylyte suggests that the temperature was raised at least 450 °C above the background levels in the host rocks. This is the first direct evidence of seismogenic fault rock from an accretionary complex. The pseudotachylyte-bearing fault is a roof thrust above underthrusted mélange, which is overlain by an offscraped package of coherent units. The geologic setting of the pseudotachylyte is consistent with melt generation during seismic slip along the master décollement in the subduction zone.

Key Words: pseudotachylyte • accretionary complex • subduction • seismogenic zone • Shimanto

This article has been cited by other articles:

				C. D. Rowe, J. C. Moore, F. Meneghini, and A. W. McKeirnan Large-scale pseudotachylytes and fluidized cataclasites from an ancient subduction thrust fault Geology, December 1, 2005; 33(12): 937 - 940. [Abstract] [Full Text] [PDF]