摘要
新疆东准噶尔北部的碱性花岗岩呈带状分布于乌伦古断裂及额尔齐斯─玛因鄂博断裂之间地区。碱性花岗岩以出现碱性暗色矿物及铁质黑云母为特征，高硅、高碱、低钙、低镁铁，富含高场强元素，属典型的Ａ型花岗岩，它们产出的特定构造环境，据化学成分的构造环境判别为板内非造山的裂谷环境；成因类型相当于Ｅｂｙ（１９９２）的Ａ１类Ａ型花岗岩，明显不同于东准噶尔中部及南部碱性花岗岩带产出的造山期后张性构造环境。
The zonal alkali granites in the north area of east Junggar are located between Wulungu fault and Ergis-Mayinebo fault.The granites are characterized by late interstitial alkali melane and annite.Chemically they show higher Si,K+Na and high field strength elements(HFSE) and lower Ca and Fe+Mg.They are typical A-type granites.The granites were emplaced in a special tectonic setting.According to various tectonic discrimination of granites using trace elements.the tectonic environment of alkali granites in northeast Junggar is a rift-related environment of anorogenesis within plates,that is different from those in the Middle and South zones.On the petrogenesis,the North zone of alkali granites corresponds to Eby's A1-type granites.Therefore,the alkali granites in the north Junggar can be used as a sign of rifting.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1995年第3期214-226,共13页
Geotectonica et Metallogenia
关键词
碱性花岗岩
岩石学
构造环境
大地构造
成因
alkali granites,petrology,tectonic environment,east Junggar,Xinjiang
