科研之友
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摘要
Mantle melt inclusions may sample and record important events of the mantle dynamic evolution. Here we report the electron microprobe analysis of melt inclusions in different mantle minerals of olivine, clinopyroxene and orthopyroxene in the Quaternary volcanic rocks in Daxing'an Mountain Range. Geochemically, these melts can be divided into two groups, low-silicate and high-silicate melts. The low-silicate melts, usually in melt pocket, are results of reactions between basaltic magma and clinopyroxene in the upper mantle. The high-silicate melts in the orthopyroxene reaction rim come from reaction between basaltic magma and orthopyroxene while the rapid ascending of the basaltic magma. The high-silicate melt inclusions produced by mantle metasomatism. Diversity of chemical compositions and occurrences of the mantle melts reveal their different origin, and also provide evidences of the mantle dynamic evolution.
- 出版日期2011-5
- 单位中国地震局
