Coexisting chloritoid-staurolite from the Sillimanite (fibrolite) zone, Sini, district Singhbhum, India

Lal, Ravindra K. and Ackermand, Dietrich (1979) Coexisting chloritoid-staurolite from the Sillimanite (fibrolite) zone, Sini, district Singhbhum, India Lithos, 12 (2). pp. 133-142. DOI 10.1016/0024-4937(79)90044-6.

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Abstract

Microprobe analyses of the minerals from an unusual chloritoid-staurolite-garnet (+ muscovite + quartz + ilmenite) assemblage from the sillimanite (fibrolite) zone of Sini, India are presented and the petrological significance of the paragenesis is discussed. The X Mg in the different minerals from the chloritoid-staurolite-bearing rock varies in the order, muscovite > chlorite > chloritoid > staurolite > garnet > ilmenite, and from the associated sillimanite-bearing schists: muscovite > biotite > staurolite > garnet rim > garnet core > ilmenite. A graphical representation of the mineral compositions in an AFM projection displays a consistent topology if the effects of non-AFM components such as Zn in the staurolite and Mn in the garnet are taken into account. Petrographic and mineralogical data are consistent with a prograde formation of the chloritoid-staurolite-garnet assemblage. It is suggested that the paragenesis has been formed at similar PT conditions to the associated sillimanite (fibrolite)-staurolite-garnet-mica schists. These conditions are estimated to be 600-625°C/6±0.5 Kb.

Document Type: Article
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/0024-4937(79)90044-6
ISSN: 0024-4937
Date Deposited: 25 Feb 2012 06:54
Last Modified: 08 Oct 2012 07:33
URI: http://eprints.uni-kiel.de/id/eprint/15538

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