识别洋陆转换的岩石学思路——洋内弧与初始俯冲的识别
Petrologic ideas for identification of ocean-continent transition: Recognition of intra-oceanic arc and initial subduction
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摘要: 阐述了洋陆转化形成的洋内弧与初始弧的岩石组合序列及其地球化学特征,提出岩浆弧是由洋陆转化以及底侵的壳幔转化共同作用形成的认识,前弧环境是洋陆转化形成初生大陆的场所,由特征的类似洋中脊的洋内弧前弧玄武岩类构成。大陆的形成过程如下:从地幔中生长出洋壳,从洋壳中的洋陆转化生长出不成熟的弧陆壳,最后从弧陆壳底侵的壳幔转化中长出成熟的陆壳。这样,地壳的生长和形成主要通过岩浆增生作用来实现。Abstract: In this paper, the authors describe the rock assemblage series and geochemical characteristics of the intra-oceanic arc and initial arc during the ocean-continent transition, and propose that the magmatic arc was formed together with the ocean-continent transition and the underplating crust-mantle transition. The former arc environment was the place where the primary continent was formed by the ocean-continent transition, which constituted diagnostic basalts of former arc of intra-oceanic arc similar to the midoceanic ridge. The formation process of the continent is as follows: the oceanic crust grew from the mantle, and the immature arccontinent crust grew from the ocean-continent transition in the oceanic crust: at last, the mature continent crust grew from the curstmantle transition of underplating arc-continent crust. Therefore, the growth and formation of the earth's crust was mainly realized by the accretion of magma.
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