Textural patterns at porphyroblast margins and their use in determining the time relations of deformation and crystallization
- 1 September 1975
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 112 (5) , 467-480
- https://doi.org/10.1017/s0016756800046197
Abstract
Textural patterns characteristic of supposed pre-, post- and to a lesser extent syn-tectonic porphyroblasts are reviewed. Difficulties of interpretation arise where an Si (internal schistosity) is absent, and Se (external schistosity) behaviour adjacent to porphyroblast margins is the only available criterion; examples may be found showing truncation of Se by pre-Se porphyroblasts. Truncation and/or deflection textures are not by themselves sufficient criteria for determining the time relations of particular phases of deformation and crystallization.Keywords
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