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(2020) The Vertical Variation of the Redox State of the Hainan Lithospheric Mantle: Constraint from Peridotite Xenoliths

Yu J, Hao Y-T, Li P & Xia Q-K


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03g: Room 1, Thursday 25th June 08:24 - 08:27

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Submitted by Jingao Liu on Monday 22nd June 07:23
Hi Dr. Hao, Nice work! I notice that the good positive trend between oxygen fugacity and equilibrium temperature indicating the anti-normal change with shallower more reduced than deeper. This has been intepreted to reflect the impact of fluid-rich metasomatism from buttom to top. But when looking at the correlation beween water content and oxygen fugacity, the shallowers samples are not those having the lowest water contents. What's reason behind it? Thanks, Jingao
The water contents are not correlated with the melting degree (cpx-rich lherzolite to harzburgite), and are modified after melt extraction which form the Hainan lithospheric mantle. Water contents of the shallower samples (point out in the circle) are relative original, are not affected by the latest fluid-rich melt. The deeper samples record the water and redox information of this fluid-rich metasomatism event. Yantao

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