南岭地区新元古代花岗岩的岩石成因及构造意义

南岭地区新元古代花岗岩表现出了一定的共性:片麻状构造和过铝质特征.南岭西段岩体可归属于S型花岗岩,主要源自基底变沉积岩石的部分熔融,成岩过程中有少量幔源组分的参与；东段岩体为铝质A型花岗岩,源自还原性的长英质火成岩,有变沉积物的参与.这些花岗岩可能形成于“短期的地幔柱活动+长时限的俯冲”的构造背景中.

Petrogenesis and Tectonic Significance of Neoproterozoic Granite in Nanling Range

Neoproterozoic granites are poorly found in Nanling Range,but they have some same features: gneissic structure and peraluminum.These granite bodies in western Nangling Range belong to S-type,while other ones in eastern Nanling Range are assigned to aluminous A-type granite.The former were most probably derived by partial melting of basement metasediment rocks and involved by mantle-derived mafic materials,however,the source of the latter ones were reduced felsic igneous rocks and metasediment.They both may formed at "short-term mantle plume plus long-term subduction" setting.