Geochronology and Nd and Pb isotope characteristics of gabbro dikes in the Luobusha ophiolite, Tibet |
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Authors: | Su Zhou Xuanxue Mo J. J. Mahoney Shuangquan Zhang Tieyjing Guo Zhidan Zhao |
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Affiliation: | (1) China University of Geosciences (Beijing), 100083 Beijing, China;(2) School of Ocean and Earth Sciences and Technology, University of Hawaii, 96822 Honolulu, HI, USA |
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Abstract: | We report a combined internal and whole-rock Sm-Nd isochron age, and Nd and Pb isotopic data for gabbro dikes of the Luobusha ophiolite in Tibet. The Sm-Nd isochron of data for two whole rocks and plagioclase and clinopyroxene separates from one of the rocks yields a Middle Jurassic age of (177±31) Ma (with an initial εNd(t) = +8), which provides a significant bound on the time of formation of the Luobusha ophiolite. The Nd and Pb isotopic characteristics of the dike indicate an Indian-Ocean-type isotopic affinity, and we conclude that the Luobusha ophiolite formed in an oceanic setting during the Middle Jurassic. |
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Keywords: | Luobusha ophiolite Sm-Nd isochron age Nd and Pb isotopes |
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