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首页> 外文期刊>Chinese science bulletin >Coupled isomorphic substitution and exsolution of pyroxene, rutile, apatite and quartz in supersilicic garnet
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Coupled isomorphic substitution and exsolution of pyroxene, rutile, apatite and quartz in supersilicic garnet

机译：超硅石榴石中辉石，金红石，磷灰石和石英的耦合同构取代和析出

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Dissolution of pyroxene in garnet at ultrahigh pressures produces supersilicic garnet with the coupled substitutions of Si~(VI) + M~(VI) = Al~(VI) + Al~(VI) and Si~(VI) + Na~(VIII) =Al~(VI) + M~(VIII) which are enhanced by rising pressure. The supersilicic garnet and exsolution of pyroxene, rutile, apatite and quartz in garnet during decompression were found in natural rocks, pointing to the importance in studying mantle-derived rocks and ultrahigh pressure metamorphism related to plate deep subduction. Ti, P, K and H_2O enters garnet via the substitutions of Ti = Si, P~(IV) + Na~(VII) = Si~(IV) + Ca~(VIII), Si~(VI) + K~(VIII) = Al~(VI) + M~(VIII), and [(OH)_4]~(4-) = [SiO_4]~(4-) or [4H]~(4+) = Si~(4+) respectively. The possible entering of Eskola pyroxene component M_(0.5)AlSi_2O_6 in clinopyroxene, together with the common pyroxene component M_2Si_2O_6, into garnet can lead to the presence of the substitution of Si~(VI) + 0.5 square~(VIII) = Al~(VI) + 0.5M~(VIII) in garnet structure, which plays a key role in the exsolution of rutile, apatite and quartz in garnet. Two new breakdown reactions are thus proposed on the basis of the new coupled substitution, which can be regarded as a theoretical model for the exsolution of the 3 minerals in garnet. The real exsolution may be a combination of several breakdown reactions.
机译：辉石在超高压下在石榴石中的溶解产生具有Si〜（VI）+ M〜（VI）= Al〜（VI）+ Al〜（VI）和Si〜（VI）+ Na〜（VIII）的偶合取代的超硅石榴石）= Al〜（VI）+ M〜（VIII），它们通过压力升高而增强。在天然岩石中发现了超硅质石榴石以及石榴石减压过程中辉石，金红石，磷灰石和石英的溶出，这表明研究地幔衍生岩石和与板块深俯冲有关的超高压变质作用具有重要意义。 Ti，P，K和H_2O通过Ti = Si，P〜（IV）+ Na〜（VII）= Si〜（IV）+ Ca〜（VIII），Si〜（VI）+ K〜（ VIII）= Al〜（VI）+ M〜（VIII），[[OH] _4]〜（4-）= [SiO_4]〜（4-）或[4H]〜（4+）= Si〜（4 +）。环吡喃中的埃斯科拉辉石组分M_（0.5）AlSi_2O_6可能与常见的辉石组分M_2Si_2O_6一起进入石榴石可能导致Si〜（VI）+ 0.5 square〜（VIII）= Al〜（石榴石结构中的VI）+ 0.5M〜（VIII），在石榴石中金红石，磷灰石和石英的析出中起关键作用。因此，在新的偶合取代的基础上，提出了两个新的分解反应，可以将其视为石榴石中3种矿物质的理论模型。真正的解脱可能是几个分解反应的组合。

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