CAJ | 학술논문

白马山小岩体位于白马山金矿区内，构造位置上属南秦岭成矿亚带，岩体与矿床具有密切的空间关系。岩体的岩性以石英闪长岩为主，边缘为少量的黑云母二长花岗岩。地球化学特征表明，白马山Ⅰ型石英闪长岩属于高钾钙碱性岩石系列，为“C”型埃达克岩。早-中三叠世南秦岭地区处于板内伸展阶段，埃达克岩和喜马拉雅型花岗岩在空间上共存，说明三叠纪白马山岩体与俯冲洋壳关系不大，可能源于陆陆碰撞造成的加厚基性下地壳。下地壳发生变质作用转变为榴辉岩相，岩石圈地幔拆沉，造成软流圈上涌、岩石圈伸展和下地壳部分熔融，岩浆混合形成白马山埃达克岩岩浆，对寻找金铜矿产具有一定的指导意义。
백마산소암체위우백마산금광구내，구조위치상속남진령성광아대，암체여광상구유밀절적공간관계。암체적암성이석영섬장암위주，변연위소량적흑운모이장화강암。지구화학특정표명，백마산Ⅰ형석영섬장암속우고갑개감성암석계렬，위“C”형애체극암。조-중삼첩세남진령지구처우판내신전계단，애체극암화희마랍아형화강암재공간상공존，설명삼첩기백마산암체여부충양각관계불대，가능원우륙륙팽당조성적가후기성하지각。하지각발생변질작용전변위류휘암상，암석권지만탁침，조성연류권상용、암석권신전화하지각부분용융，암장혼합형성백마산애체극암암장，대심조금동광산구유일정적지도의의。
Baimashan small rock,related to the gold deposit in spacial,is located in the Baimashan gold deposit area,the South Qinling ore-forming sub-belt.It is dominanted by the granodiorite and minor biotite monzonite at the marginal part.Geochemical characters indicate that Baimashan quartz diorite belong to the high K calc-alkalic series,however,they also have more similar geochemical characters to the“C”type adakite than the“O”type adakite.The tectonic nature of lithosphere in South Qinling was characterized by transition from compression to extention in the Early-Middle Triassic period.The granites of adakite in the South Qinling area may resulted from partial melting of the mafic lower crust(basalts) in the thickened lower crust,and mixing with the mafic magma, due to the lithospheric stretching and the asthenosphere upwelling,which can provide some clues to the collision between the North China Plate and the Qinling micro-plate,and also direct copper-gold prospecting.