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Article

Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India

1
Departamento de Mineralogía y Petrología, Facultad de Ciencias, Universidad de Granada, Avda. Fuentenueva s/n, 18002 Granada, Spain
2
Australian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC, Macquarie University, Sydney NSW 2109, Australia
3
Department of Geological Sciences, Jadavpur University, 188, Raja SC Mullick Road, Kolkata, West Bengal 700032, India
4
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700019, India
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 686; https://doi.org/10.3390/min10080686
Received: 2 July 2020 / Revised: 27 July 2020 / Accepted: 29 July 2020 / Published: 31 July 2020
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. View Full-Text
Keywords: ophiolite; chromitite; platinum-group minerals; osmium isotopes; Andaman; subduction zone ophiolite; chromitite; platinum-group minerals; osmium isotopes; Andaman; subduction zone
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MDPI and ACS Style

González-Jiménez, J.M.; Mondal, S.K.; Ghosh, B.; Griffin, W.L.; O’Reilly, S.Y. Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India. Minerals 2020, 10, 686. https://doi.org/10.3390/min10080686

AMA Style

González-Jiménez JM, Mondal SK, Ghosh B, Griffin WL, O’Reilly SY. Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India. Minerals. 2020; 10(8):686. https://doi.org/10.3390/min10080686

Chicago/Turabian Style

González-Jiménez, José María, Sisir K. Mondal, Biswajit Ghosh, William L. Griffin, and Suzanne Y. O’Reilly. 2020. "Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India" Minerals 10, no. 8: 686. https://doi.org/10.3390/min10080686

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