俯冲带壳-幔相互作用的高温高压实验:对地幔不均一性成因的启示

王春光; 许文良

doi:10.3799/dqkx.2019.230

Volume 44 Issue 12

Dec. 2019

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Wang Chunguang, Xu Wenliang, 2019. An Experimental of Crust-Mantle Interaction in Subduction Zones: Implications for Genesis of Mantle Heterogeneity. Earth Science, 44(12): 4112-4118. doi: 10.3799/dqkx.2019.230

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Wang Chunguang, Xu Wenliang, 2019. An Experimental of Crust-Mantle Interaction in Subduction Zones: Implications for Genesis of Mantle Heterogeneity. Earth Science, 44(12): 4112-4118. doi: 10.3799/dqkx.2019.230

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An Experimental of Crust-Mantle Interaction in Subduction Zones: Implications for Genesis of Mantle Heterogeneity

doi: 10.3799/dqkx.2019.230

Wang Chunguang^,,
Xu Wenliang^{,
,}

College of Earth Sciences, Jilin University, Changchun 130061, China

Received Date: 2019-09-01
Publish Date: 2019-12-15

Abstract

Abstract

A series of experiments reacting peridotite with melts derived from partial melting of eclogites was accomplished in order to better understand factors that control crust-mantle interaction in subduction zones. The experiments were conducted using the reaction couple method at 0.8-3.0 GPa and 1 200-1 425℃. The experimental results show that kinetics and consequence of melt-rock reaction are controlled by factors including major element composition and H₂O in reacting melt, temperature, pressure, and physical state of reacting peridotite. Orthopyroxene enrichment in mantle beneath subduction zones is a result of interaction between melt derived from recycling continental crust and overlaying mantle. Formation of orthopyroxenite veins in mantle rocks is related to hydrous mantle metasomatism. Garnet-bearing and garnet-rich lithologies in mantle rocks were likely formed by melt-rock reaction in the low-temperature regime.
- subduction zone,
- crust-mantle interaction,
- mantle heterogeneity,
- melt-peridotite reaction experiment,
- petrology

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References(22)

References

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