A Study of REE and Pb, Sr and N d Isotopes in Garnet-Lherzolite Xenoliths from Mingxi, Fujian Province

The REE and Pb ,Sr,Nd isotopes in three xenoliths from limburgite and scoria-breccias,including spinel-lherzolite,spinel-gamet-1herzolite and phlogopite-gamet-1herzolite,were analysed.The REE contentso of the xenoliths are 1.3 to 3.3 times those of the chondrites with their REE pattems characterized by weak LREE depletion.The ^143Nd/^144Nd values of whole rocks and minerals range from 0.51306 to 0.51345 with εNd=+8.2-+15.8,^206Pb/^204Pb<18.673,and ^207Pb/^204Pb<15.574,All this goes to show that the upper mantle in Mingxi at the depth of 67-82km is a depleted mantle of MORB type,with ^87Sr/^86Sr ratios 0.70237-0.70390.In Nd-Sr diagram the data points of whole rocks are all out of the mantle array,implying that the xenoliths from Mingxi have more radiogenic Sr isotopes than those of the mantle array.

S37-97 芳基澳的选择性胺化

KF-Al2O3（不同配比）与催化量Pd2（dba）3／BINAP充分混匀，加热至80-90℃，滴入芳基溴和胺（摩尔比1：2．5），反应1h生成单胺化产物。10例收率64％～90％：如果加热至135℃。滴入二溴芳和胺（摩尔比1：8），反应3h，生成双胺化产物，6例收率56％～90％。邻二溴苯则只能得到单胺化产物，3例收率65％～90％。