@misc{10481/64306,
year = {2020},
month = {7},
url = {http://hdl.handle.net/10481/64306},
abstract = {Laser ablation MC-ICP-MS was used to measure the Os-isotope compositions of single
sulfide grains, including laurite (RuS2) and pentlandite [(Fe,Ni)9S8], from two chromitite bodies
and host lherzolites from ophiolites of North Andaman (Indo-Burma-Sumatra subduction zone).
The results show isotopic heterogeneity in both laurite (n = 24) and pentlandite (n = 37), similar
to that observed in other chromitites and peridotites from the mantle sections of ophiolites.
Rhenium-depletion model ages (TRD) of laurite and pentlandite reveal episodes of mantle magmatism
and/or metasomatism in the Andaman mantle predating the formation of the ophiolite (and the
host chromitites), mainly at  0.5, 1.2, 1.8, 2.1 and 2.5 Ga. These ages match well with the main
tectonothermal events that are documented in the continental crustal rocks of South India, suggesting
that the Andaman mantle (or its protolith) had a volume of lithospheric mantle once underlaying
this southern Indian continental crust. As observed in other oceanic lithospheres, blocks of ancient
subcontinental lithospheric mantle (SCLM) could have contributed to the development of the
subduction-related Andaman–Java volcanic arc. Major- and trace-element compositions of chromite
indicate crystallization from melts akin to high-Mg IAT and boninites during the initial stages of
development of this intra-oceanic subduction system.},
publisher = {Mdpi},
keywords = {Ophiolite},
keywords = {Chromitite},
keywords = {Platinum-group minerals},
keywords = {Osmium isotopes},
keywords = {Andaman},
keywords = {Subduction zone},
title = {Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India},
doi = {10.3390/min10080686},
author = {González Jiménez, José María and Mondal, Sisir K. and Ghosh, Biswajit and Griffin, William L. and O’Reilly, Suzanne Y.},
}