湘赣边界北诸广山超单元组合特征及构造意义

用单元—超单元填图方法，对诸广山北段加里东期花岗岩进行研究，表明桂东序列、左安超单元具有Ⅰ型花岗岩特点，形成于板块碰撞前环境，汤湖超单元为Ｓ型花岗岩，形成于同碰撞环境。综合各种地质地球化学因素，推断它们形成的地球动力学过程为陆内二次拆离俯冲，首次拆离中形成桂东序列岩浆，第二次拆离中形成左安超单元岩浆，同时，强烈挤压应力造成两拆离体间地壳增厚，从而引起上地壳物质的部分熔融形成汤湖超单元。

Characteristics and tectonic implications of the superunit assemblage in the northern Zhuguang Mountains on the Hunan-Jiangxi border

Caledonian granites in the northern segment of the Zhuguang Mountains were studied by using the unit superunit mapping method. The results indicate that the Guidong sequence and Zuo'an superunit have the characteristics of I type granites and were formed in a pre collision environment and that the Tanghu superunit is represented by S type granites, and originated in a syn collision environment. By integrating all geological and geochemical factors, it is inferred that the geodynamic process of their formation experienced two events of intracontinental detachment and subduction: the first detachment produced the magma of the Guidong sequence, and the second detachment the magma of the Zuo'an superunit; meanwhile, strong compressive stress led to thickening of the crust between two detachments and partial melting of upper mantle material, thus forming the Tanghu superunit.