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Sm-Nd ISOTOPIC AGE OF LAMPROPHYRES IN THE GEZHEN GOLD-BEARING SHEAR ZONE ON HAINAN ISLAND AND ITS GEOLOGICAL IMPLICATIONS |
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| Authors: | XU De-ru LIANG Xin-quan CHEN Guang-hao HUANG Zhi-long |
| Institution: | 1. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013, China;Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Changsha Institute of Geotectonics, Chinese Academy of Sciences, Changsha 410013, China 3. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
| Abstract: | 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. |
| Keywords: | Lamprophyre Sm-Nd isochron age Gezhen gold-bearing shear zone western Hainan Island |
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