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首页> 外文期刊>Contributions to Mineralogy and Petrology >The activity of silica in kimberlites, revisited
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The activity of silica in kimberlites, revisited

机译：再谈金伯利岩中二氧化硅的活性

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The activity of silica in a silicate liquid in equilibrium with olivine and orthopyroxene decreases with increasing pressure. In contrast, the activity of silica in an unbuffered silicate liquid changes little with pressure. Although the implications of these pressure dependencies have been considered by previous authors in terms of inferring pressures of origin of magmas, less consideration has been given to the implications of these dependencies on the evolution of the magma en route to the surface, or to the mantle through which the magma passes. In this paper, a combination of Schreinemakers’ analysis in isothermal section and calculated reactions in space is used to (a) rationalize the absence of orthopyroxene xenocrysts in kimberlites and the relative abundance of olivine “megacrysts” therein, (b) propose another reason for the paucity of xenocrystic mantle-derived carbonates in kimberlites, (c) explain why clinopyroxene is much less reactive in the kimberlite melt than is orthopyroxene, and (d) explore the implications of the relative stabilities of olivine, orthopyroxene, and clinopyroxene in kimberlitic magma for the mantle through which the magma transits. Communicated by T. L. Grove.
机译：随着压力的升高，硅酸盐液体中的橄榄石与橄榄石和邻苯二甲酚平衡的活性降低。相反，未缓冲的硅酸盐液体中二氧化硅的活性随压力变化很小。尽管以前的作者已经在推断岩浆起源压力方面考虑了这些压力相关性的含义，但对岩浆到地表或地幔演化过程中这些相关性的含义的考虑却很少。岩浆穿过。本文将Schreinemakers的等温截面分析与空间反应计算相结合，以（a）合理化金伯利岩中不存在邻苯二茂异种晶以及其中橄榄石“巨晶”的相对丰度，（b）提出了另一个原因金伯利岩中稀有异地幔幔源的碳酸盐，（c）解释了为什么金英石熔体中斜辉石的反应性不如邻二甲苯，（d）探索了橄榄石，邻辉石和金刚砂岩相对稳定性的含义。穿过岩浆的地幔。由T. L. Grove沟通。

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