The Effects of High-Grade Metamorphism on Cr-Spinel from the Archean Sittampundi Complex, South India

Journal article


Lenaz, Davide, Bidyananda, Maibam, Adetunji, Jacob and Skogby, Henrik 2021. The Effects of High-Grade Metamorphism on Cr-Spinel from the Archean Sittampundi Complex, South India. Minerals. 11 (12), p. 1370. https://doi.org/10.3390/min11121370
AuthorsLenaz, Davide, Bidyananda, Maibam, Adetunji, Jacob and Skogby, Henrik
Abstract

We investigated the crystal and structural behavior of Cr‐bearing spinels from the Ar‐
chean chromitites of Sittampundi (India), which had been subjected to very high‐grade metamor‐
phism. The structural data show that their oxygen positional parameters are among the highest ever
recorded for Cr‐bearing spinels with similar Cr# and Mg# and very similar to those found for other
Archean occurrences. The general agreement between electron microprobe and Mössbauer data in‐
dicates that the analyzed spinels are stoichiometric. It is therefore most likely that the PH2O and Ptotal
values as well as both the oxygen fugacity and the temperature reached during high‐grade meta‐
morphism inhibited the possibility of the non‐stoichiometry of chromites, contrary to what can hap‐
pen in ophiolites, where non‐stoichiometry has recently been documented.

Keywordshigh‐grade metamorphism; structural refinement; Mössbauer spectroscopy
Year2021
JournalMinerals
Journal citation11 (12), p. 1370
PublisherMDPI AG
ISSN2075-163X
Digital Object Identifier (DOI)https://doi.org/10.3390/min11121370
Web address (URL)http://hdl.handle.net/10545/626287
http://creativecommons.org/publicdomain/zero/1.0/
hdl:10545/626287
Publication dates03 Dec 2021
Publication process dates
Deposited16 Feb 2022, 16:26
Accepted30 Nov 2021
Rights

CC0 1.0 Universal

ContributorsUniversità degli Studi di Trieste, Trieste, I-34127, Italy, Manipur University, Imphal 795003, India, University of Derby and Swedish Museum of Natural History, SE-10405 Stockholm, Sweden
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