Sm-Nd ISOTOPIC AGE OF LAMPRO PHYRES IN THE GEZHEN GOLD BEARING SHEAR ZONE ON HAINAN ISLAND AND ITS GEOLOGICAL IMPLICATIONS  

作　　者：XU De ru1,2, LIANG Xin quan1, CHEN Guang hao1 and HUANG Zhi long2(1. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013, China 2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China) 

出　　处：《Geotectonica et Metallogenia》2002年第1期76-81,共6页大地构造与成矿学（英文版）

摘　　要：Sm Nd isotopic compositions of eight lamprophyre samples, which come from the Gezhen gold bearing shear zone on western Hainan Island, are measured. The Sm Nd isochron age is 495.98±13.14 Ma, (143Nd/144Nd)0=0.512094, εNd(t) ranges from +1.80 to +2.00 and TDM from 982 Ma to 1196 Ma (average: 1060 Ma). The authors point out that the whole rock Sm Nd isochron age (495.98±13.14 Ma) really represents the petrogenetic age of lamprophyre and the time of magmatism during subsequent subduction.Sm Nd isotopic compositions of eight lamprophyre samples, which come from the Gezhen gold bearing shear zone on western Hainan Island, are measured. The Sm Nd isochron age is 495.98±13.14 Ma, (143Nd/144Nd)0=0.512094, εNd(t) ranges from +1.80 to +2.00 and TDM from 982 Ma to 1196 Ma (average: 1060 Ma). The authors point out that the whole rock Sm Nd isochron age (495.98±13.14 Ma) really represents the petrogenetic age of lamprophyre and the time of magmatism during subsequent subduction.

关 键 词：LAMPROPHYRE SM-ND ISOCHRON age Gezhen gold-bearing SHEAR zone western HAINAN ISLAND 

分 类 号：P597[天文地球—地球化学]