The petrogenetic age of Tunchang basaltic komatiites in Hainan Island has never been solved for a long time.Five samples of the basaltic komatiites are taken to be measured by Sm－ Nd radioactive isotope method in thi...The petrogenetic age of Tunchang basaltic komatiites in Hainan Island has never been solved for a long time.Five samples of the basaltic komatiites are taken to be measured by Sm－ Nd radioactive isotope method in this study.The Sm－ Nd whole rock isochron age of 1 687± 10 Ma with INd=0.510796± 0.000006 (2σ ) and ε Nd(T)=＋ 6.64 has been obtained.Meanwhile the basaltic komatiites give Nd model age of 1637～ 1 756 Ma which correspond basically to the isochron age of 1 687 Ma.These indicate that Tunchang basaltic komatiites were formed in the Palaeoproterozoic (about 1 687 Ma) and its primary magma would be derived from a depleted mantle.展开更多
基金The paper is finicially supported by the key gold and resource environment project(KZ952- J1- 007) of " the Eighth Five Years
文摘The petrogenetic age of Tunchang basaltic komatiites in Hainan Island has never been solved for a long time.Five samples of the basaltic komatiites are taken to be measured by Sm－ Nd radioactive isotope method in this study.The Sm－ Nd whole rock isochron age of 1 687± 10 Ma with INd=0.510796± 0.000006 (2σ ) and ε Nd(T)=＋ 6.64 has been obtained.Meanwhile the basaltic komatiites give Nd model age of 1637～ 1 756 Ma which correspond basically to the isochron age of 1 687 Ma.These indicate that Tunchang basaltic komatiites were formed in the Palaeoproterozoic (about 1 687 Ma) and its primary magma would be derived from a depleted mantle.
