论文部分内容阅读
陕西岚皋境内赋存于早古生代碱质潜火山煌斑杂岩中的“金云角闪辉石岩”捕虏体是交代地幔捕虏体。主要组成矿物为单斜辉石、角闪石、金云母、磷灰石、钙钛矿、钛铁矿及榍石,发育“三联晶”、“碎裂边”等固相线下的变质变形结构;矿物学研究表明单斜辉石富SiO_2、MgO,贫Al_2O_3、TiO_2,与寄主岩中深源单斜辉石巨晶及单斜辉石斑晶成分差别明显,形成于地幔压力范畴。角闪石和金云母具地幔交代成因的成分待点。Sm-Nd同位素的研究表明,本区交代地幔是原始地幔受来源于地幔柱
The “Jinyunjianite Phlogopite” xenolith, exuded from the Early Paleozoic alkaline subvolcanic Huangpu complex in Shaanxi Province, is an explanation of the mantle xenolith. The main minerals are clinopyroxene, hornblende, phlogopite, apatite, perovskite, ilmenite and scab, and the metamorphic deformation under solidus such as “triple crystal” and “crushing edge” The mineralogical studies show that the enrichment of SiO_2, MgO, Al_2O_3 and TiO_2, which are rich in clinopyroxene, is obviously different from the deep-source clinopyroxene and clinopyroxene phenocrysts in the host rocks, forming in the mantle pressure category. Hornblende and phlogopite mantle metasomatism composition of the ingredients to be treated. The study of Sm-Nd isotopes shows that the mantle in this area was derived from the mantle plume