【摘要】 华南地区存在两种类型变质基底。Sm-Nd同位素数据的研究结果表明,它们可分别代表华南两种类型元古代地壳端员。华夏地块区副变质岩代表成熟度较高的（早）元古代地壳端员,¹⁴⁷Sm/¹⁴⁴Nd=0.1198,¹⁴³Nd/¹⁴⁴Nd=0.511822;江南古岛弧区副变质岩代表成熟度较低的（中—晚）元古代地壳端员,¹⁴⁷Sm/¹⁴⁴Nd=0.1246,¹⁴³Nd/¹⁴⁴Nd=0.512170。根据上述数据得出了华南元古代地壳Sm-Nd同位素演化域,进而对华南不同时代花岗岩类的物质来源作了进一步的讨论。更多还原

【Abstract】 There exist two types of metamorphic basements in South China. The results of Sm-Nd isotopic study indicate that they represent the two types of Proterozoic crustal endmember. The parametamorphic rocks in the Cathayia Massif represent the（Early）Proterozoic crustal endmember of higher degree of maturation with ¹⁴⁷Sm/¹⁴⁴Nd=0.1198 and ¹⁴³Nd/¹⁴⁴Nd=0. 511822, while those in the Jiangnan Paleo-island-arc represent the（Middle—Late）Proterozoic crustal endmember of lower degree of maturation with ¹⁴⁷Sm/¹⁴⁴Nd=0.1246 and ¹⁴³Nd/¹⁴⁴Nd =0.512170. Based on the above-mentioned data, the Sm-Nd isotopic evolution region of the Proterozoic crust in South China has been obtained, and the material sources of granitoids in this region have been interpreted.更多还原