| 大兴安岭南段朝阳沟-新林镇一带印支期花岗岩的确认及其基本地质特征 |
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| 引用本文：岳永君.1993.大兴安岭南段朝阳沟-新林镇一带印支期花岗岩的确认及其基本地质特征[J].地球学报,14(3):67-78. |
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| 中文摘要:大兴安岭南段原划海西期的新林镇-西耳子岩体和从原划燕山期的朝阳沟岩体中分解出来的水泉沟岩体分别为印支早期和印支晚期花岗岩。新林镇-西耳子岩体东西两侧岩性差异较大，东部为中粒黑云母花岗岩，西部为中细粒黑云母花岗闪长岩，岩石地球化学方面该岩体以SiO2含量变化大、标准矿物刚玉含量低或出现Di分子、轻稀土强烈富集、Eu异常很弱为特征，为早印支期造山作用期间下地壳火成物质部分熔融形成的I型花岗岩。水泉沟岩体主要由粗粒黑云母花岗岩组成，与新林镇-西耳子岩体比较，该岩体在岩相学方面表现出石英、钾长石的增多，斜长石的减少，在岩石地球化学方面表现为SiO2含量、碱度升高，Al2O2、CaO含量降低，Eu丰度降低．其他稀土元素丰度升高，LREE富集程度降低，Sr及过渡金属元素丰度降低，Rb丰度升高，这些规律性变化表明：印支晚期水泉沟岩体为印支早期岩浆经斜长石分离结晶的产物。 |
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| Abstract:It has been comfirmed in this paper that the Xinlinzhen-Xierzi Batholith and the Shuiquangou batholith were formed during the early Indosinian and late Indosinian, respectively, Petrologically, there is a quite large difference between the east part and the west part of the former, which are composed of medium-grained biotite granite and medium-to fine-grained biotite granodiorite, respectively. The Xinlinzhen-Xierzi batholith is totally characterized by a great change in Sio2 content, low content of norm Corundum or occorrence of norm Diopside, strong enrichment in LREE and very weak Eu anomaly. These show that this batholith is of the I-type granite formed by thr partial melting of igneous materials of the lower crust during the early Indosinian orogenic phase. |
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