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Minerals 2018, 8(9), 410; https://doi.org/10.3390/min8090410

Petrology of Peridotites and Nd-Sr Isotopic Composition of Their Clinopyroxenes from the Middle Andaman Ophiolite, India

1
Faculty of Geosciences and Civil Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa 920-1192, Japan
2
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA
3
Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 1-3-2 Kagamiyama, Higashi-Hiroshima City, Hiroshima 739-8511, Japan
4
Graduate School of Natural Science & Technology, Kanazawa University, Kanazawa 920-1192, Japan
5
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India
*
Author to whom correspondence should be addressed.
Received: 26 May 2018 / Revised: 22 August 2018 / Accepted: 13 September 2018 / Published: 17 September 2018
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Abstract

The Andaman Ophiolite, India, is located at the southeastern end of the Tethyan ophiolites. We examine petrology and mineralogy of two lherzolites and a completely serpentinized dunite associated with lherzolite from the middle Andaman Island. Major and trace element compositions of minerals in the lherzolites suggest their residual origin after low-degree of partial melting with less flux infiltration, and are similar to those of abyssal peridotites recovered from mid-ocean ridges. The dunite with spinels having low-Cr/(Cr + Al) ratio was formed by interaction between peridotite and mid-ocean ridge basalt-like melt. The 87Sr/86Sr and 143Nd/144Nd isotopic systematics of clinopyroxenes of the two lherzolites are consistent with MORB-type mantle source. Petrology and light rare earth element (LREE)-depleted patterns of clinopyroxene from the studied lhezolites are the same as those from some of the western Tethyan ophiolites. The age-corrected initial εNd values of the Tethyan lherzolite clinopyroxenes with LREE-depleted patterns are likely to be consistent with the depleted mantle evolution line. View Full-Text
Keywords: the Andaman ophiolite; peridotite; Nd-Sr isotopes the Andaman ophiolite; peridotite; Nd-Sr isotopes
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Morishita, T.; Yoshikawa, M.; Tamura, A.; Guotana, J.M.; Ghosh, B. Petrology of Peridotites and Nd-Sr Isotopic Composition of Their Clinopyroxenes from the Middle Andaman Ophiolite, India. Minerals 2018, 8, 410.

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