美国Spruce Pine与新疆阿尔泰地区高纯石英伟晶岩的对比研究  

Characteristics of Granitic Pegmatite with High-Purity Quartz in Spruce PineR egion,USA and Altay Region of Xinjiang,China

作　　者：张晔[1] 陈培荣[1] 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室地球科学与工程学院,南京210093

出　　处：《高校地质学报》2010年第4期426-435,共10页Geological Journal of China Universities

基　　金：江苏省科技成果转化专项资金项目(BA2005038)

摘　　要：对美国北卡罗来纳州Spruce Pine地区白岗岩/伟晶岩和新疆阿尔泰白云母花岗岩/伟晶岩进行了对比研究。这两个地区的伟晶岩可能是过铝质花岗岩浆通过熔体-蒸汽分异作用的产物。美国产高纯石英的伟晶岩发育在片岩、片麻岩的背景之上,主要造岩矿物中富含斜长石,Na大于K,大离子亲石元素Sr和Ba含量高,高场强元素和稀土元素含量低,Eu正异常,石英中杂质元素含量低。这些特征可作为高纯石英伟晶岩的判别标志。我国阿尔泰地区的伟晶岩脉十分发育,所研究的样品中,有些样品已经具有这些特点,阿尔泰伟晶岩区具有产高纯石英的成矿前景。The alaskites/pegmatites from the Spruce Pine region of USA and the muscovite granites/pegmatites from the Altay region of Xinjiang,China,were comparatively studied.The pegmatites from both regions might be melt-vapor differentiation products of the peraluminous granitic magmas.The pegmatites from the Spruce Pine region with high-purity quartz were developed on the schist or gneiss background,whose major rock-forming minerals are rich in plagioclase,showing high Na/K ratios,high large-ion lithophile elements Sr and Ba contents,low high-field strength and rare earth elements contents,positive Eu anomalies, and low impurity elements contents in quartz.All these characteristics can be used as the discrimination criteria of high-purity quartz pegmatities.The Altay region of Xinjiang is abundant of pegmatites,and some samples studied showed the features which evidenced that the Altay pegmatite region has a perspective to find the gualified pegmatites with high-purity quartz.

关 键 词：伟晶岩 高纯石英 SPRUCE PINE 阿尔泰 

分 类 号：P588[天文地球—岩石学] P578.494[天文地球—地质学]