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pseudotachylite
Pseudotachylite or Pseudotachylyte is a cohesive glassy or very fine-grained fault rock that is composed of an extremely fine-grained or glassy matrix that often contains inclusions of wall-rock fragments. Pseudotachylite characteristically occurs in veins; is dark in color; and is glassy in appearance. It often has the appearance of the basaltic glass, tachylyte. Typically, the glass has been completely devitrified into very fine-grained material with radial and concentric clusters of crystals. It occasionally contains crystals with quench textures that began to crystallize from the melt.〔Maddock, R.H. (1983) (''Melt origin of fault-generated pseudotachylites demonstrated by textures.'' ) Geology. 11(6):105–108.〕〔Trouw, R.A.J., C.W. Passchier, and D.J. Wiersma (2010) ''Atlas of Mylonites- and related microstructures.'' Springer-Verlag, Berlin, Germany. 322 pp. ISBN 978-3-642-03607-1〕
==Formation==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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