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为进一步研究MORB斜长石熔体包裹体的形成机制,结合南大西洋中脊19°区域附近与Pet DB中MORB斜长石熔体包裹体数据,对Ca/Al值在斜长石熔体包裹体形成与改造过程中的变化规律进行讨论。结果显示,Ca/Al值可指示斜长石熔体包裹体形成过程中的化学分异作用、寄主结晶作用与扩散再平衡作用;当MORB斜长石熔体包裹体的Ca/Al>0.85(或0.80)时,熔体包裹体不能代表MORBs未分异的原始岩浆或结晶分异后的演化岩浆,SMAR19°研究区中MORB斜长石熔体包裹体的Ca/Al>1.0,其组分不能代表被捕获时的原始熔体。
In order to further study the formation mechanism of MORB plagioclase melt inclusions, combining the data of melt inclusions of MORB plagioclase in the vicinity of 19 ° in the mid-Atlantic ridge and the Pet DB, Body formation and transformation process of the changes in the discussion. The results show that Ca / Al value can indicate chemical differentiation, host crystallization and diffusion rebalancing in the melt inclusions of plagioclase; when the Ca / Al ratio of MORB plagioclase melt inclusions is 0.85 ( Or 0.80), the melt inclusions can not represent the undifferentiated primitive magma or the evolving magma after crystallization differentiation. The Ca / Al> 1.0 of MORB plagioclase melt inclusions in the SMAR19 ° study area, Can not represent the original melt when caught.