MINERAL CHEMISTRY AND REE COMPOSITIONS OF PERIDOTITE XENOLITHS FROM LIUHE,JIANGSU AND ITS IMPLICATIONS
江苏六合橄榄岩包体的矿物化学,稀土元素组成及其意义

Based on the careful determination of mineral chemistry compositions and calculation of geothermometry for 11 peridotite xeneliths from Liuhe, Jiangsu, it is concluded that accurate chemical compositions is very important forobtaining an acceptable equlibrium temperature of xeneliths. If the results of geothermometer on K6hler-Brey and Sachtleben-Seek methods are the same or similar, the temperatures are reliable. In Liuhe area, equlibrium temperature for harzburgite is lower than that of lherzolite. It might imply that harzburite is probably locatedin shallower position of upper mantle.The abundance and distribution patterns of rare earth element in xeneliths are not simply correlated with partial melting and indicated that an enriched process in the mantle must have happened and caused the LREE enrichment, and HREE unchanging. This might be a mixing process between primitive mantle component and residue of partial melting.