Identifying mantle carbonatite metasomatism through Os-Sr-Mg isotopes in Tibetan ultrapotassic rocks
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- 作者：Dong Liua ; Zhidan Zhaoa ; zdzhao@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Di-Cheng Zhua ; Yaoling Niua ; b ; Elisabeth Widomc ; Fang-Zhen Tengd ; Donald J. DePaoloe ; Shan Kea ; keshan@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Ji-Feng Xuf ; Qing Wanga ; Xuanxue Moa
- 关键词：Os&ndash ; Sr&ndash ; Mg isotopes ; carbonatite metasomatism ; ultrapotassic rocks ; Neo-Tethyan Ocean ; Tibetan plateau
- 刊名：Earth and Planetary Science Letters
- 出版年：2015
- 出版时间：15 November 2015
- 年：2015
- 卷：430
- 期：Complete
- 页码：458-469
- 全文大小：4049 K
文摘
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A combined use of Os, Sr, and Mg isotopes on the Tibetan ultrapotassic rocks.
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High 187Os/188Os in ultrapotassic rocks corroborate effect of crustal contamination.
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Low 未26Mg can be observed in the ultrapotassic rocks with mantle-like 187Os/188Os.
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Dolomite-related metasomatism is manifested by correlations between 未26Mg and Hf/Sm.
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Spatial variations of Hf/Sm and 未26Mg indicate the Neo-Tethyan seafloor subduction.