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首页> 外文期刊>Journal of Asian earth sciences >Clinopyroxene phenocrysts (with green salite cores) in trachybasalts: implications for two magma chambers under the Kokchetav UHP massif, North Kazakhstan
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Clinopyroxene phenocrysts (with green salite cores) in trachybasalts: implications for two magma chambers under the Kokchetav UHP massif, North Kazakhstan

机译：斜纹玄武岩中的斜辉石酚醛树脂（具有绿色硅酸盐岩核）：对北哈萨克斯坦Kokchetav UHP地块下两个岩浆室的影响

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摘要

Clinopyroxene phenocrysts in the Kokchetav trachybasalts are variable in composition and textures. Two distinctive cores are recognized: diopside cores and green salite cores. The diopside cores with Mg# of 80-90 are mantled by colorless salite rims with Mg# of 70-80. The green salite cores have especially low Mg# (<70) but high Al and Ti contents. A Mg-rich band (Mg# = 82-90) usually occurs between a green salite core and its rim, and/or between a colorless salite mantle and its rim. Dissolution surfaces are observed on all textural variants. Two magma chambers are needed to explain the observed Clinopyroxene phenocrysts. A deep chamber at about 120 km in the upper mantle in which diopside cores crystallized, and a shallow chamber at depths of less than 40 km in which diopside cores were resorbed and overgrown by salite rims or mantles. Magma mixing in the shallow chamber is responsible for the formation of dissolution surfaces between the diopside bands and the colorless salite mantles. The dissolution surfaces on the diopside cores formed in the shallow chamber as a result of pressure decrease. This magma evolution scenario is complicated by the occurrence of the crustal-origin green salite cores in diopsides. These green cores likely represent the relics of continental materials, which were captured in the deep chamber and partially re-melted. Our observations indicate that subducted continental materials were returned to the Earth's surface as a result of magmatism. This study therefore provides direct evidence of a link between subducted continental materials (slab) and magmatism in this orogenic belt.
机译：Kokchetav trachybasalts中的次氯环己烯类晶石在组成和质地上是可变的。公认有两个独特的核心：透辉石核心和绿色硅酸盐核心。 Mg＃为80-90的透辉石核被Mg＃为70-80的无色盐岩轮辋覆盖。绿硅酸盐岩芯的Mg＃（<70）特别低，但Al和Ti含量高。富镁带（Mg＃= 82-90）通常出现在绿色的硅酸盐岩芯与其边缘之间，和/或在无色的硅酸盐岩幔与其边缘之间。在所有纹理变体上均观察到溶解表面。需要两个岩浆室来解释观察到的斜基苯酚隐晶。上地幔中约120 km处的一个深室，透辉石核在其中结晶，而小于40 km深度的浅室，透辉石的岩芯被硅酸盐边缘或地幔吸收并长满。岩浆在浅室中的混合负责在透辉石带和无色的盐岩幔之间形成溶蚀表面。由于压力降低，在浅室中形成的透辉石核上的溶解表面。由于在透辉石中出现了地壳起源的绿色硅酸盐岩芯，这种岩浆演化的情况变得复杂了。这些绿色核心很可能代表了大陆性材料的遗物，这些材料被捕获在深室中并被部分重熔。我们的观察表明，俯冲的大陆物质是由于岩浆作用而返回到地球表面的。因此，这项研究提供了直接证据，证明该造山带俯冲大陆材料（平板）与岩浆作用之间存在联系。

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