Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India
Laser ablation MC-ICP-MS was used to measure the Os-isotope compositions of single sulfide grains, including laurite (RuS<sub>2</sub>) and pentlandite [(Fe,Ni)<sub>9</sub>S<sub>8</sub>], from two chromitite bodies and host lherzolites from ophiolites of North Anda...
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MDPI AG
2020-07-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/8/686 |
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| author | José María González-Jiménez Sisir K. Mondal Biswajit Ghosh William L. Griffin Suzanne Y. O’Reilly |
| author_facet | José María González-Jiménez Sisir K. Mondal Biswajit Ghosh William L. Griffin Suzanne Y. O’Reilly |
| author_sort | José María González-Jiménez |
| collection | DOAJ |
| description | Laser ablation MC-ICP-MS was used to measure the Os-isotope compositions of single sulfide grains, including laurite (RuS<sub>2</sub>) and pentlandite [(Fe,Ni)<sub>9</sub>S<sub>8</sub>], 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 (<i>T</i><sub>RD</sub>) 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. |
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| publishDate | 2020-07-01 |
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| series | Minerals |
| spelling | doaj.art-2b5174bcf6854f8ca5b1e97986dd94dc2023-11-20T08:40:46ZengMDPI AGMinerals2075-163X2020-07-0110868610.3390/min10080686Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, IndiaJosé María González-Jiménez0Sisir K. Mondal1Biswajit Ghosh2William L. Griffin3Suzanne Y. O’Reilly4Departamento de Mineralogía y Petrología, Facultad de Ciencias, Universidad de Granada, Avda. Fuentenueva s/n, 18002 Granada, SpainDepartment of Geological Sciences, Jadavpur University, 188, Raja SC Mullick Road, Kolkata, West Bengal 700032, IndiaDepartment of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700019, IndiaAustralian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC, Macquarie University, Sydney NSW 2109, AustraliaAustralian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC, Macquarie University, Sydney NSW 2109, AustraliaLaser ablation MC-ICP-MS was used to measure the Os-isotope compositions of single sulfide grains, including laurite (RuS<sub>2</sub>) and pentlandite [(Fe,Ni)<sub>9</sub>S<sub>8</sub>], 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 (<i>T</i><sub>RD</sub>) 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.https://www.mdpi.com/2075-163X/10/8/686ophiolitechromititeplatinum-group mineralsosmium isotopesAndamansubduction zone |
| spellingShingle | José María González-Jiménez Sisir K. Mondal Biswajit Ghosh William L. Griffin Suzanne Y. O’Reilly Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India Minerals ophiolite chromitite platinum-group minerals osmium isotopes Andaman subduction zone |
| title | Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India |
| title_full | Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India |
| title_fullStr | Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India |
| title_full_unstemmed | Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India |
| title_short | Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India |
| title_sort | re os isotope systematics of sulfides in chromitites and host lherzolites of the andaman ophiolite india |
| topic | ophiolite chromitite platinum-group minerals osmium isotopes Andaman subduction zone |
| url | https://www.mdpi.com/2075-163X/10/8/686 |
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