【摘要】 在查明区域燕山期花岗岩类的期次及各期次岩石组合特征的基础上,重点研究和系统总结两类花岗岩的地质地球化学特征。壳幔质混熔型花岗岩类岩体多呈浅成-超浅成相小岩体,分布于长平深大断裂带附近及其东侧,其组成岩石主要为花岗闪长岩类,岩石化学成分属硅铝过饱和的钙碱性或钙性花岗岩类,为部分熔融岩浆的产物,与斑岩型和热液脉型铜多金属矿床在时空和成因上密切相关;陆壳改造型花岗岩类岩体多呈中深成相岩基、岩株状,分布于长平深大断裂带附近及其西侧,其岩石组合复杂程度取决于同源深部岩浆分异程度,岩石化学成分属硅铝过饱和钙碱性花岗岩类,其岩石总体特征表明此类花岗质岩浆形成于较深的壳层,源区的温度和压力较高。更多还原

【Abstract】 Based on identifying the intrusive stages and rock assemblages of the Yanshanian granitoids in northeast Hunan, systematical study on geological and geochemical features has been carried out. Granitoids in the study area can be divided into crust-mantle melt type and crust melt type, the former,consisting mainly of calc-alkaline granodiorite with silica and alumina supersaturated,is usually small hypabyssal or ultra-hypabyssal intrusions distributing along the Changsha-Pingjiang deep-seated fault or its eastern side and associated with porphyry or hydrothermal vein copper-polymetallic mineralization; the latter,consisting mainly of calc-alkaline granite with silica and alumina supersaturated, is usually large plutonic batholith or stock, distributing along the Changsha-Pingjiang deep-seated fault or its western side.更多还原