阿尔泰巴利尔斯河一带岩体LA-MC-ICP-MS锆石U-Pb年代学、岩石成因及地质意义
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摘要
新疆阿尔泰巴利尔斯河一带岩体岩石类型复杂,主要岩石组合为花岗闪长岩、黑云二长花岗岩和二长花岗岩。花岗闪长岩和二长花岗岩中LA-MC-ICP-MS锆石U-Pb测年结果分别为(386.4±2.8)Ma和(386.8±1.2)Ma。花岗闪长岩、黑云二长花岗岩和二长花岗岩地球化学分析结果显示,岩石Si O2含量为74.33%~76.70%,里特曼指数为1.49~2.04,A/CNK值介于1.00~1.07,大离子亲石元素Rb、Th等和轻稀土元素相对富集,高场强元素Sr、Ti、Nb等和重稀土元素则相对亏损,具较强的负Eu异常(δEu=0.31~0.84),表明该岩石为具有富钾、钙碱性、弱过铝质特征的高分异I型花岗岩。综合研究认为,巴利尔斯河一带岩体形成于与俯冲作用有关的活动大陆边缘的岩浆弧构造环境,是古亚洲洋向北俯冲消减过程中岩浆上侵就位的产物。
Rock types in the Baliersi River area of the Chinese Altay Orogen( Xinjiang) are complex,including granodiorite,biotite monzogranite and monzogranite. LA-MC-ICP-MS zircon U-Pb dating reveals that the granodiorite and monzogranite were formed at( 386. 4 ± 2. 8) Ma and( 386. 8 ± 1. 2) Ma,respectively. Geochemical analysis of the granodiorite,biotite monzogranite and monzogranite show that the Si O2 contents range from74. 33% to 76. 70%,Rittman index( σ) range from 1. 49 to 2. 04,and the A/CNK values range from 1. 00 to1. 07. In addition,the rocks show enrichments in LILEs( e. g.,Rb,Th) and LREEs,and obvious depletions in HREEs and HFSEs( e. g.,Sr,Ti,Nb) and strong negative Eu anomaly( δEu = 0. 31 to 0. 84),suggesting that the rocks are high-K calc-alkaline,peraluminous highly-fractioned I-type granites. Integrated with previous studies,it is concluded that granitoids in the Baliersi River area were formed in a continental margin magmatic arc setting,via the north-dipping subduction of the Paleo-Asian Ocean.
Rock types in the Baliersi River area of the Chinese Altay Orogen( Xinjiang) are complex,including granodiorite,biotite monzogranite and monzogranite. LA-MC-ICP-MS zircon U-Pb dating reveals that the granodiorite and monzogranite were formed at( 386. 4 ± 2. 8) Ma and( 386. 8 ± 1. 2) Ma,respectively. Geochemical analysis of the granodiorite,biotite monzogranite and monzogranite show that the Si O2 contents range from74. 33% to 76. 70%,Rittman index( σ) range from 1. 49 to 2. 04,and the A/CNK values range from 1. 00 to1. 07. In addition,the rocks show enrichments in LILEs( e. g.,Rb,Th) and LREEs,and obvious depletions in HREEs and HFSEs( e. g.,Sr,Ti,Nb) and strong negative Eu anomaly( δEu = 0. 31 to 0. 84),suggesting that the rocks are high-K calc-alkaline,peraluminous highly-fractioned I-type granites. Integrated with previous studies,it is concluded that granitoids in the Baliersi River area were formed in a continental margin magmatic arc setting,via the north-dipping subduction of the Paleo-Asian Ocean.
引文
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[21]柴凤梅,董连慧,杨富全,等.阿尔泰南缘克朗盆地铁木尔特花岗岩体年龄、地球化学特征及成因[J].岩石学报,2010,26(2):377-386.
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[25]张亚峰,蔺新望,郭岐明,等.阿尔泰南缘可可托海地区二厂房岩体LA-ICP-MS锆石U-Pb年代学、岩石成因及其地质意义[J].岩石矿物学杂志,2014,33(1):13-28.
[26]姜丽萍,柴凤梅,杨富全,等.新疆阿尔泰两棵树铁矿区二长花岗岩LA-ICP-MS锆石定年及地质意义[J].现代地质,2011,25(4):712-719.
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(1)新疆地质矿产局第四地质大队.新疆富蕴县巴尔鲁克—库珠尔特1∶5万区域地质调查报告.