首页|Effect of Iron on the Stability of Rhodochrosite at the Topmost Lower Mantle Conditions
Effect of Iron on the Stability of Rhodochrosite at the Topmost Lower Mantle Conditions
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Carbonates are viewed as the principal oxidized carbon carriers during subduction,and thus the stability of subducted carbonates has significant implications for the deep carbon cycle.Here we investigate the high pressure-temperature behaviors of rhodochrosite in the presence of iron up to～34 GPa by in-situ X-ray diffraction and ex-situ Raman spectroscopy.At relatively low temperature be-low～1500 K,MnCO3 breaks down into MnO and CO2.Upon heating to～1800 K,however,the Mn-CO3-Fe0 reactions occur with the formation of Mn3O4,FeO and reduced carbon.A'three-stage'reac-tion mechanism is proposed to understand the kinetics of the carbon-iron-manganese redox coupling.The results suggest that Fe0 can serve as a reductant to greatly affect the stability of rhodochrosite,which implies that the effect of Fe-metal should be seriously considered for the high pressure-temperature behaviors of other predominant carbonates at Earth's mantle conditions,particularly at depths greater than～250 km.
deep carbon cyclerhodochrositereduced mantlediamond formationhigh pressuretectonicsgeochemistry
Tianlei Zhai、Fei Qin、Shengxuan Huang、Shan Qin、Yu Gong
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Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,Peking University,Beijing 100871,China
School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China
Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China
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