Micro－PIXE analysis of trace element composition and their distribution in minerals of mantle peridotite

Ｍｉｃｒｏ－ＰＩＸＥａｎａｌｙｓｉｓｏｆｔｒａｃｅｅｌｅｍｅｎｔｃｏｍｐｏｓｉｔｉｏｎａｎｄｔｈｅｉｒｄｉｓｔｒｉｂｕｔｉｏｎｉｎ　ｍｉｎｅｒａｌｓｏｆｍａｎｔｌｅｐｅｒｉｄｏｔｉｔｅＣｈｅｎＹｏｕ－Ｈｏｎｇ（陈友红），ＺｈｕＪｉｅ－Ｑｉｎｇ（朱节清...     

尖晶石—石榴石相转变过程中矿物的微量元素组成与分布特征

利用质子微探针和微束ＰＩＸＥ定量分析技术对山东梭罗树地幔橄榄石，斜方辉石，单斜辉石，尖晶石和石榴石等矿物的向量元素和组成与他布进行了研究。结果表明，不相容元素主要富集于单斜辉石内，尖晶石则几乎富集质子探针所能检出的所有向量元素，而石石中向量元素含量最少。     

Mantle metasomatism for metaperidotite from Shuanggou ophiolite of Yunnan Province by proton microprobe

This study shows that olivine,serpentine and orthopyroxene are enriched with compatible element Ni;clinopyroxene with Ni and Y;spinel strongly with Ni,Zn,Ga,Ge,As and Zr;chlorite with Ni,Zn,Sr and Zr,However,grossulatrite is poor in all of these trace elements,except Sr.The trace element composition and distribution in the minearls are heterogeneous.The distributions of trace elements in the minerals further demonstrate that they result from mantle metasomatism under open system.     

尖晶石－石榴石相转变过程中矿物的微量元素组成与分布特征

利用质子微探针和微束ＰＩＸＥ定量分析技术对山东梭罗树地慢橄榄岩中橄榄石、斜方辉石、单斜辉石、尖晶石和石榴石等矿物的微量元素组成与分布进行了研究。结果表明，不相容元素（Ｓｒ、Ｙ、Ｚｒ）主要富集于单斜辉石内，尖晶石则几乎富集质子探针所能检出的所有微量元素，而石榴石中微量元素含量最少。该研究表明，在矿物微区微量元素分布是十分不均匀的，推测可能受地幔交代过程中溶液的渗滤效应以及存在微粒包裹体的共同制约。     

Micro—PIXE analysis of trace element composition and their distribution in minerals of mantle peridotite

The proton microprobe and the quantitative micro-PIXE analysis technique are used to determine trace element composition and distribution in minerals of mantle peridotite,therefore,additional useful information is provided on the study of upper mantle mineral phase transformation.An example reported here is the study on the geochemical behavior of trace elements in minerals of Suoluoshu mantle peridotite from Shandong province,which was in the process of mineral phase transformation from spinel to garnet.The study shows that trace element composition and distribution display obvious change in minerals while the mineral phase is transformed from spinel to garnet.Most of the trace elements analyzed reside in clinopyroxene and spinel.However,garnet is nearly poor in all of these elements.This phenomenon is associated with the infiltration of soultion and the existence of micropgrained inclusions in minerals in the process of mantle metasomatism.