Reevaluating carbon fluxes in subduction zones, what goes down, mostly comes up.
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Carbon fluxes in subduction zones can be better constrained by including new estimates of carbon concentration in subducting mantle peridotites, consideration of carbonate solubility in aqueous fluid along subduction geotherms, and diapirism of carbon-bearing metasediments.Abstract:
Carbon fluxes in subduction zones can be better constrained by including new estimates of carbon concentration in subducting mantle peridotites, consideration of carbonate solubility in aqueous fluid along subduction geotherms, and diapirism of carbon-bearing metasediments. Whereas previous studies concluded that about half the subducting carbon is returned to the convecting mantle, we find that relatively little carbon may be recycled. If so, input from subduction zones into the overlying plate is larger than output from arc volcanoes plus diffuse venting, and substantial quantities of carbon are stored in the mantle lithosphere and crust. Also, if the subduction zone carbon cycle is nearly closed on time scales of 5–10 Ma, then the carbon content of the mantle lithosphere + crust + ocean + atmosphere must be increasing. Such an increase is consistent with inferences from noble gas data. Carbon in diamonds, which may have been recycled into the convecting mantle, is a small fraction of the global carbon inventory.read more
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Journal ArticleDOI
Lithospheric modification by carbonatitic to alkaline melts and deep carbon cycle: Insights from peridotite xenoliths of eastern China
Deng Lixu,Deng Lixu,Xianlei Geng,Yongsheng Liu,Keqing Zong,Lüyun Zhu,Zhengwei Liang,Zhengwei Liang,Zhaochu Hu,Guodong Zhang,Chen Guangfu +10 more
TL;DR: In this paper, a detailed petrographic, in-situ chemical and Sr isotopic study on two mantle xenoliths (a wehrlite and a melt pocket-bearing peridotite) entrained by the Changle Miocene basalts from the eastern China is presented.
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James Eguchi,James Eguchi +1 more
TL;DR: In this article, the authors investigated the solubility of calcite in salt-H2O fluids at 700 °C and 8 kbar, using a piston cylinder apparatus.
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Experimental study of metamorphic reactions and dehydration processes at the blueschist–eclogite transition during warm subduction
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Hadean Jack Hills Zircon Geochemistry
TL;DR: Geochemical analysis of zircons older than 4 billion years, found in Early Archean metasediments at Jack Hills, Western Australia, provide insights into the nature of Hadean Earth Oxygen isotopes have been interpreted as indicating that protoliths of magmas from which hadean zirons crystallized were formed in the presence of water at or near Earth's surface.
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