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Hydrothermal alteration of plagioclase in granitic rocks from Proterozoic basement of SE Sweden by S. Morad; M. A. K. El‐Ghali; M. A. Caja; M. Sirat; K. Al‐Ramadan; H. Mansurbeg is a Earth and Planetary Sciences article available to read on EtoBox.

What is Hydrothermal alteration of plagioclase in granitic rocks from Proterozoic basement of SE Sweden about?

## Abstract Petrographic examinations and electron microprobe analyses of Proterozoic granitic rocks, SE Sweden aimed to characterize and unravel the mechanisms and conditions of plagioclase alterations. These alterations include saussuritization, albitization and replacement of plagioclase by K‐feldspar. The hydrothermal alterations, which are inferred to have occurred at __ca.__ 250–400°C, resulted in concomitant formation of Al‐rich titanite, epidote, calcite, pumpellyite, prehnite and iron oxides. Replacement of plagioclase by K‐feldspar occurs in red‐stained zones, which have developed close to thin fractures owing to the precipitation of tiny Fe‐oxide pigment particles within the altered plagioclase, whereas saussuritized plagioclase has less systematic spatial relationships to these fractures. Albitization of plagioclase occurred in rocks that are poor in biotite compared to rocks that suffered extensive saussuritization. The chemical and textural characterization of various types of plagioclase alterations allows elucidation of the granitic hydrothermal systems. Features of feldspar alteration in the granitic rocks are similar to those encountered in feldspathic sandstones

Who reads Hydrothermal alteration of plagioclase in granitic rocks from Proterozoic basement of SE Sweden?

Author

S. Morad; M. A. K. El‐Ghali; M. A. Caja; M. Sirat; K. Al‐Ramadan; H. Mansurbeg

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0072-1050)

Published

2009

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)