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首页> 外文期刊>Chinese science bulletin >Sapphirine-bearing high pressure mafic granulite and its Implications in the south Altyn Tagh
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Sapphirine-bearing high pressure mafic granulite and its Implications in the south Altyn Tagh

机译：南部Altyn Tagh含蓝宝石的高压镁铁质花岗质花岗岩及其意义

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摘要

Sapphirine-bearing high pressure mafic granulites are recognized in the Bashiwake area of the south Altyn Tagh. Mafic granulites and associated peridotites occur as lenses within kyanite-bearing high pressure felsic granulites. Sapphirine occurs as intergrowths with corundum, spinel and Ca-rich plagiodase in symplectite in between garnet and clinopyroxene. Reaction textures and mineral compositions indicate that Sapphirine-bearing symplectite formed by reactions consuming kyanite, garnet and clinopyroxene. Therefore, both petrographic observations and the mineral compositions suggest that these quartz-free mafic granulites Iliad an eclogite origin with an assemblage of garnet + clinopyroxene + kyanite, which is estimated to be stable at T =1000 deg C and P > = 2.1 GPa. The sapphirine-bearing symplectites are resulted from isothermal decompression or decompression with slight cooling during exhumation of the host rock.
机译：在南部的阿尔金·塔格（Altyn Tagh）的巴希瓦克（Bashiwake）地区，人们公认带有蓝宝石的高压镁铁质花岗石。镁铁质花岗岩和相关橄榄岩以晶状体的形式存在于含蓝晶石的高压长英质花岗岩中。蓝宝石与石榴石和斜柏石之间的硬石膏中的刚玉，尖晶石和富含Ca的plaggdase共生。反应的质地和矿物组成表明，通过消耗蓝晶石，石榴石和斜柏基的反应形成的含蓝宝石的手榴石。因此，岩石学观察和矿物组成都表明这些无石英的镁铁质粒状花岗岩是榴辉岩成因，其石榴石+斜辉石+蓝晶石组成，据估计在T = 1000摄氏度且P> = 2.1 GPa时稳定。含蓝宝石的手榴石是由于等温减压或在主体岩体掘出过程中略有冷却而减压的结果。

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