Time Scale of Partial Melting of KLB-1 Peridotite: Constrained from Experimental Observation and Thermodynamic Models

Wei Du; Li Li; Donald J. Weidner

doi:10.1007/s12583-018-0839-8

Volume 29 Issue 2

Mar 2018

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Journal of Earth Science > 2018 > 29(2): 245-254.

Wei Du, Li Li, Donald J. Weidner. Time Scale of Partial Melting of KLB-1 Peridotite: Constrained from Experimental Observation and Thermodynamic Models. Journal of Earth Science, 2018, 29(2): 245-254. doi: 10.1007/s12583-018-0839-8

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Wei Du, Li Li, Donald J. Weidner. Time Scale of Partial Melting of KLB-1 Peridotite: Constrained from Experimental Observation and Thermodynamic Models. Journal of Earth Science, 2018, 29(2): 245-254. doi: 10.1007/s12583-018-0839-8

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Time Scale of Partial Melting of KLB-1 Peridotite: Constrained from Experimental Observation and Thermodynamic Models

doi: 10.1007/s12583-018-0839-8

Wei Du^{1,2
,
,},
Li Li²,
Donald J. Weidner²

1.
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.
Mineral Physics Institute, Department of Geosciences, University of New York at Stony Brook, Stony Brook NY 11790, USA

More Information

Corresponding author: Wei Du, duwei@vip.gyig.ac.cn
Received Date: 21 Apr 2017
Accepted Date: 08 Jan 2018
Publish Date: 01 Apr 2018

Abstract

Abstract

Partial melting experiments were carried on KLB-1 peridotite, a xenolith sample from the Earth's upper mantle, at 1.5 GPa and temperatures from 1 300 to 1 600 ℃, with heating time varies from 1 to 30 min. We quantify the axial temperature gradient in the deformation-DIA apparatus (D-DIA) and constrain the time scale of partial melting by comparing experimental observations with calculated result from pMELTS program. The compositions of the liquid phase and the coexisting solid phases (clinopyroxene, orthopyroxene, and olivine) agree well with those calculated from pMELTS program, suggesting that local chemical equilibrium achieves during partial melting, although longer heating time is required to homogenize the bulk sample. The Mg^# (=Mg/(Mg+Fe) mol.%) of olivines from the 1-minute heating experiment changed continuously along the axial of the graphite capsule. A thermal gradient of 50 ℃/mm was calculated by comparing the Mg^# of olivine grains with the output of pMELTS program. Olivine grains at the hot end of the graphite capsule from the three experiments heated at 1 400 ℃ but with different annealing time show consistence on Mg^#, indicating that partitioning of Fe²⁺ between the olivine grains and the silicate melt happened fast, and partial melting occurs in seconds.
- peridotite,
- partial melting,
- temperature gradient,
- pMELTS program

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References(39)

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