Dihedral Angle of Carbonatite Melt and Olivine System at Low Temperature

ZHU Qiao; LIU Hanyong; YANG Xiaozhi

doi:10.11858/gywlxb.20200553

Volume 35 Issue 1

Jan 2021

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Chinese Journal of High Pressure Physics > 2021 > 35(1): 011202.

ZHU Qiao, LIU Hanyong, YANG Xiaozhi. Dihedral Angle of Carbonatite Melt and Olivine System at Low Temperature[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 011202. doi: 10.11858/gywlxb.20200553

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ZHU Qiao, LIU Hanyong, YANG Xiaozhi. Dihedral Angle of Carbonatite Melt and Olivine System at Low Temperature[J]. Chinese Journal of High Pressure Physics, 2021, 35(1): 011202. doi: 10.11858/gywlxb.20200553

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Dihedral Angle of Carbonatite Melt and Olivine System at Low Temperature

doi: 10.11858/gywlxb.20200553

State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China

Received Date: 25 Apr 2020
Rev Recd Date: 15 May 2020
Issue Publish Date: 25 Sep 2020

Abstract

Abstract

As an important fluid medium in the upper mantle, carbonatite melt has stronger chemical and physical activity than silicate melt. The occurrence of a small amount of carbonatite melt in the upper mantle will significantly affect its many geophysical and geochemical properties, such as electrical conductivity and element composition. Experimental studies at elevated conditions are important approaches to understand the chemical and physical effects of carbonatite melt. The physical and chemical influences of carbonatite melt are closely related to its distribution and geometry in the system, and a key factor of them for the characterization is the dihedral angle. Available studies on the dihedral angle (and various physical effects) of carbonate melt are normally carried out at extremely high temperature exceeding about 1 200 ℃, and the potential problem is that the complex reactions between the melt and solid minerals is inevitable and the experiment is difficult under extreme high temperature. In this work, in order to overcome the problems, the reported dihedral angle distribution in the carbonatite-olivine system at low temperature not exceeding 700 ℃ was measured by a low melting pointing carbonatite mixture. The experiments were conducted at 1 GPa with an end-loaded piston cylinder apparatus, and the dihedral angle distribution in the recovered samples were carefully examined by scanning electron microscopy. The results demonstrate a homogeneous distribution of melt in the system, and the observed dihedral angles are mostly 10°−40°, with the average values of 24°−27°. Consequently, this carbonatite has greater ability in wetting grain boundaries, and provides a new analog for future studies on the behavior and geophysical properties of carbonatite melt inside the Earth.
- carbonatite melt,
- grain boundary geometry,
- dihedral angle,
- high temperature and pressure experiments

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References(54)

References

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Dihedral Angle of Carbonatite Melt and Olivine System at Low Temperature

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