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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Genesis of microdiamonds from melt and associated multiphase inclusions in garnet of ultrahigh-pressure gneiss from Erzgebirge, Germany
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Genesis of microdiamonds from melt and associated multiphase inclusions in garnet of ultrahigh-pressure gneiss from Erzgebirge, Germany

机译：德国Erzgebirge的超高压片麻岩中石榴石的熔融物和相关多相包裹体中的微金刚石成因

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摘要

The common association of microdiamonds with the phase assemblage: phlogopite, apatite, paragonite and α-quartz (containing amorphous Na-Al silicate inclusions), as inclusions in garnets of quartzofeldspathic rocks from the Saxonian Erzgebirge, Germany, was studied by analytical electron microscopy. The assemblage implies a precedent melt, which coexisted with the microdiamonds before and after entrapment in the garnet host, and subsequently crystallized. The formation of microdiamonds in this metamorphic rock could be explained by cotectic-induced partial melting of a subducted continental slab at about 4-6 GPa and 1000 ℃, as constrained by the occurrence of TiO_2 with an α-PbO_2-type structure at the peak metamorphic conditions, and by the catalytic effect of siderophild and chalcophile elements.
机译：通过分析电子显微镜研究了微金刚石与相组合的常见组合：金云母，磷灰石，方石和α-石英（含有无定形的Na-Al硅酸盐夹杂物），这些夹杂物来自德国萨克森州的Erzgebirge石英长石岩石的石榴石中。这种组合意味着先有的熔体，它在夹在石榴石基质中之前和之后与微金刚石共存，然后结晶。这种变质岩中微金刚石的形成可以解释为由共晶诱导的俯冲大陆板在约4-6 GPa和1000℃下的部分熔融，这受峰值出现具有α-PbO_2型结构的TiO_2的约束变质条件，并受嗜铁和嗜硫元素的催化作用。

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