广西圆石山花岗岩体构造与侵位机制初探  

A Research for Emplacement Mechanism and Structure of Yuanshishan Granitoid

作　　者：邓继新[1] 刘瑞珣[1] 史謌[1] 梁金城[2] 冯佐海[2] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]桂林工学院资环系,桂林541004

出　　处：《北京大学学报（自然科学版）》2002年第2期260-267,共8页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：广西自然科学基金资助 (桂科字 :9912 0 11)

摘　　要：在对圆石山岩体围岩热变质带及岩体内部构造研究的基础上 ,认识岩浆在上升、侵位过程中对围岩的作用及岩体各单元间在先后定位过程中的相互作用 ,从而确定岩体的侵位机制。同时运用岩浆动力学原理从另一个角度探讨其侵位驱动力。综上指出 :经分凝后的活动性岩浆在深部侧向挤压和浮力的联合驱动下 ,沿深大断裂以最小临界宽度为 2 2 1～ 3.88m的裂隙脉动上侵 ,整体以岩墙扩展的方式被动定位于银殿山穹窿的核部 。Based on the analysis of thermal contact metamorphic aureoles,granitoid interior structure,quartz axis fabric and strain characters in the different rock unites of Yuanshishan granitoid and its wall rocks,the emplacement mechanism of Yanshishan granitoid was studied.The magmatic explictite dynamic was advanced in light of regional stress and magma dynamic research.Those conclusion was synthesized to ascertain the emplacement mechanism—granitic magma ascended in dikes with the minimum critical width of the magma ascending channels about 2.21～3.88?m and located in the core of Yindianshan dome with the passive style of dyke explictite;the later unite is a kind of multiple emplacement mechanism with the character of active emplacement of ballooning.

关 键 词：侵位机制 应变分析 岩浆动力学 圆石山 广西 花岗岩 岩体构造 

分 类 号：P588[天文地球—岩石学]