粤东中生代花岗质火山-侵入杂岩成因的Nd同位素制约

CONSTRAINS ON Nd ISOTOPE:GENESIS OF MESOZOIC GRANITIC VOLCANIC INTRUSIVE COMPLEXES IN EASTERN GUANGDONG

运用Ｎｄ同位素及稀土元素Ｎｄ的含量关系对岩浆成因的制约，结合区域地质地球化学特征，确定粤东地区中生代花岗质火山－侵入杂岩的成因机制，不是幔源岩浆同化地壳物质并发生分离结晶作用以及壳幔两种来源岩浆的混合作用，而是地壳深熔作用，即古老地壳基底岩石的部分熔融作用。

Mesozoic granitic volcanic intrusive complexes crop out widely over eastern Guangdong Province. To investigate the genesis of the granitic complexes, the data of Nd isotope and Nd element in some acidic volcanic rocks and granites are discussed.According to this research and the regional geological and geochemical characteristics,it is concluded that the genesis of the Mesozoic granitic volcanic intrusive complexes are neither mantle magma assimilation fractional crystallization,nor mixing of mantle magma and crustal magma,but anatexis (equilibrium partial melting )of continental crust.