摘要
阿尔泰诺尔特地区处于西伯利亚板块和哈萨克斯坦—准葛尔板块接壤处的北部。花岗岩体沿红山嘴断裂带分布，出露广泛。花岗岩主要形成于加里东晚期、华大西中、晚期，岩体主要侵入手上泥盆统忙代恰组和下石炭统红山嘴组中。岩性主要为黑云母花岗岩、黑云母二长花岗岩、斜长花岗岩及花岗斑岩。区内花岗岩均为铝过饱和型（A1＞K＋Ca＋Na），ANKC值近于1，Na／K值平均为0．70，具改造型花岗岩的特点。稀土元素具轻稀土富集特征，中等负销异常，La／Yb值较大，具S型花岗岩的特点．本文采用多种构造判别图解，均得到相似结论，即诺尔特地区花岗岩主要属于同碰撞花岗岩，花岗岩的形成与造山活动有密切关系。阿尔泰造山依次经历了5期构造运动：喀纳斯运动、大桥运动、阿尔泰运动、泛阿尔泰运动及喜马拉雅运动。区内花岗岩的形成主要受大桥运动和阿尔泰运动所控制。
Nurt area of Altay is loCated in the north of the boundary between Siberia and Kazakhstan-Junggar plates. Granites in the Nurt area are scattered along the Hongshanzui faultsystem and widely exposed over the area. The granites were mainly formed at late Caledonianstage (396Ma-440Ma), middle Hercynian stage (292Ma-330Ma) and late Hercynian stage(about 224Ma). The granites intruded into Upper Devonian Mangdaiqia Fm and Lower Carboniferous Hongshanzui Fm. According to the lithological compositions, the granites may divided into biotite-granite 9 muscovite-biotite-granite, biotite-monzonite, plagioclase-granite andgranite-porphyry. Their compositions show that they belong to Al-supersaturated granites (Al>K+Ca+Na), the average value of ANKC is close to 1, the average value of Na/K ratio is0. 70,showing the features of transformation type granites. The REE are characterized by enrichment of LREE, medium negative Eu anomalies and high La/Yb ratios,indication the features of S-type granites. The tectonic discrimination diagram, R1-R2 tectonic discrimination diagram and ORG normalired patterns, which were used for distinguishing the types of granitesof the area, provide the results similar to the above-mentioned conclusion, showing that thegranites in the Nurt area mainly belong to the syncollision type and their formation is closelyrefored to orogenies. Aiso there are some magmatic intrusive activities occurred at the post-orogenic phase. Five tectonic movements were developed in the Altaides successively, namely,Hanasi,Daqiao,Altay, pan-Altay and HAnalayan orogenies.
出处
《火山地质与矿产》
1997年第3期203-210,共8页
Volcanology & Mineral Resources
基金
"九五"国家科技攻关项目!"库马苏矿带金
多金属找矿预测研究"
96-915-02-04
类别A
关键词
花岗岩
构造环境
诺尔特地区
新疆
granite tectonic discrimination Nurt Altay Xinjiang
