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西澳西金伯利地区,白榴石钾镁煌斑岩的白榴石斑晶(和假白榴石)中,出现小的(通常小于20μm)铝尖晶石(亚铁尖晶石-铁尖品石)包体.这种尖晶石与基质中共存的钛铁镁铬铁矿显著不同,后者很象岩石中其它贫铝的铁镁相.白榴石中类似的铝尖晶石包体,还在另一种钾镁煌斑岩-高斯伯格(Gaussberg)橄榄白榴石岩——于1个大气压下的实验中出现.基于矿物学和实验证据,这种过碱性火山岩的白榴石中铝尖晶石包体的形成被解释为在过饱和条件下,原始的包含Mg、Al和Fe~(2+)的固溶体从非理想配比的白榴石中的出溶作用.
Small (usually less than 20 μm) aluminum spinel (ferrous spinel-iron (Fe-Fe-spinel) appears in leucite plagioclase Pointed stone) inclusions, which are significantly different from the coexisting ilmenite-magnesian chromite in the matrix, which is much like the other poorly-aluminated Fe-Mg phases in the rock.A similar aluminum spinel in leucite The inclusions, which are also found in the experiment at 1 atm, are another pegmatite-Gaussberg olivine-white garnet. Based on mineralogical and experimental evidence, this overbased volcanic rock The formation of aluminum spinel inclusions in leucite was interpreted as the dissolution of the original solid solution containing Mg, Al and Fe ~ (2+) from leucine with non-ideal ratio under supersaturated conditions effect.