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通过详细的镜下矿物组合观察、单晶结构和电子探针成分测定 ,确定了南极拉斯曼丘陵与条带状堇青石 柱晶石片麻岩互层的片麻岩中产出的氟磷镁石Ma5bc新多型 ,氟磷镁石与磷灰石共生并以造岩矿物出现 .贫钙不是氟磷镁石形成的必要条件 ,关键在于F ,P和Mg供应充分 ,而钙对镁的活动相对不足 ,否则 ,将只能形成磷灰石 .本区强烈发育的深熔作用可以造成浅、暗组分的分异和分别集中 ,F ,P易集中于暗色富镁铁组分中 ,达一定浓度时即形成氟磷镁石 .成分因素可能决定了氟磷镁石的出现与否 ,温压条件则导致氟磷镁石多型的变化 :较高温环境下为无序多型 ,之后经历较缓慢的降温冷却过程后转变为有序多型 ,本区即Ma5bc多型 .
Through detailed microscopic observation of mineral assemblage, single crystal structure and determination of electronic probe composition, the fluorine and phosphorus content of gneiss in interlaminar strata of cordierite and barite in the Antarctic are determined Magnesite Ma5bc neoporosite, pflurantite and apatite are symbiotic and occur as rock-forming minerals.Deletion of calcium is not a necessary condition for the formation of flutathione but the key is that F, P and Mg are supplied in sufficient quantities, while the effect of calcium on magnesium The relative lack of activity, otherwise, will be able to form apatite.Deep deep development of the strong development of the region can cause shallow and dark components of the differentiation and concentration, F, P easy to concentrate in the dark-rich ferromanganese component, Up to a certain concentration of the formation of fluperite. Composition factors may determine the presence or not of fluorapfruc, temperature and pressure conditions led to changes in the type of fluticasic: Polymorph at higher temperatures for the disorder, after After a slower cooling and cooling process into an ordered polytype, the region that Ma5bc polytype.