Chemical heterogeneity in an enderbite-hosted pseudotachylite, eastern India: evidence for syn-deformation multi-reaction melting in pseudotachylite

The origin of chemical and mineralogical heterogeneity in tens-of-microns wide layers and domains in enderbite-hosted couple-of-centimeters wide pseudotachylite vein is examined based on the results of BSE and X-ray element imaging, and electron probe microanalyses of major elements of host-rock min...

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Bibliographic Details
Published in:Contributions to mineralogy and petrology 2011-04, Vol.161 (4), p.547-563
Main Authors: Patro, Radhika, Mahapatro, S. N., Bhattacharya, A., Pant, N. C., Nanda, J. K., Dey, A., Tripathy, A. K.
Format: Article
Language:English
Subjects:
Chemical reactions
Chemicals
Deformation
Earth and Environmental Science
Earth Sciences
Fractionation
Geology
Heterogeneity
High temperature
Melting
Mineral Resources
Mineralogy
Minerals
Original Paper
Petrology
Quartz
Rocks
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Summary:The origin of chemical and mineralogical heterogeneity in tens-of-microns wide layers and domains in enderbite-hosted couple-of-centimeters wide pseudotachylite vein is examined based on the results of BSE and X-ray element imaging, and electron probe microanalyses of major elements of host-rock minerals, clasts, microphenocrysts, and pseudotachylite matrix. The pseudotachylite layers and domains containing variable proportions of orthopyroxene and magnetite microphenocrysts continue as mantles around quartz, K-feldspar, plagioclase and garnet clasts. The clasts are chemically modified along margins and intra-clast pseudotachylite injections. The chemical modifications are extensive in smaller clasts
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-010-0548-5