首页|Structural Stability of Natural Magnesiochromite at High-Temperature-Pressure Conditions

Structural Stability of Natural Magnesiochromite at High-Temperature-Pressure Conditions

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The podiform chromitites in the Luobusha ophiolite have been thought to experience a very deep formation,but the maximum depth is still an open issue.Here,we have investigated the structural stability of natural magnesiochromite using the synchrotron-based powder X-ray diffraction and diamond anvil cells up to 48.6 GPa and 2 450 K.The results have shown that spinel-type magnesio-chromite first decomposes into corundum-type'Cr2O3'+B1-type'MgO'at 11-14 GPa and 1 250-1 450 K,then modified ludwigite(mLd)-type'Mg2Cr,O5'+corundum-type'Cr2O3'at 14.3-20.5 GPa and 1 300-2 000 K,and finally CaTi2O4-type phase at 24.5 GPa.During the quenching procession from high-temperature-pressure conditions,the mLd-type phase appeared again and was kept at ambient conditions.We also obtained the isothermal equation states of spinel-type and CaTi2O4-type phases,re-vealing the composition effect on their elasticities.Based on the updated results,we propose chromitites could not experience pressure exceeding～14.3 GPa(approximate maximum depth～400 km)in the subduction-recycling genesis model.

chromitehigh-temperature and high-pressurephase transitionsequation of statechromitites genesis

Shuyu Jin、Xiang Wu、Yungui Liu、Yanfei Zhang、Chao Wang

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State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China

College of Gems and Materials,Hebei GEO University,Shijiazhuang 050031,China

National Science Foundation of ChinaGeo-SoilEnviroCARSAdvanced Photon Source(APS)Argonne National Laboratory(ANL)National Science Foundation-Earth SciencesDepartment of Energy,GeosciencesDOE-BES

41827802Sector 13-ID-DEAR-1634415DE-FG02-94ER14466DE-AC02-06CH11357

2024

10.1007/s12583-022-1798-7

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(4)