地质论评2011，Vol.57Issue(3)：350-365,16.
阿尔泰南缘乌吐布拉克铁矿区花岗质岩石年代学及成因
Study on Chronology and Genesis of Granite in the Wutubulake Iron Deposit District, Southern Margin of Altay
摘要
Abstract
LA-ICP-MS U-Pb zircon dating on the plagiogranite and biotite plagiogranite from the Wutubulake iron deposit district, southern margin of Altay, Xinjiang, yielded concordant ages of 385.6～ 2.3 Ma(MSDW＝0. 13) and 387.7 ～ 2. 1 Ma ( MSDW ＝ 0. 23), indicates that the two comagmatic plutons were formed at the beginning of the Middle Devonian. The Wutubulake iron deposit is closely related to the magmatic intrusion, writers hereby confine the iron deposit formed at the beginning of the Middle Devonian appreciably later than 388～386 Ma. The Wutubulake plagiogranite and biotite plagiogranite are characterized by enrichment of silica(SiO2=66.01～79. 14％) and Na(Na2O＞K2O). The A/CNK{A/ CNK=n(Al2O3)/[n(CaO)+n(Na2O)+n(K2O)]} ratios are less than 1. 1 ,indicates that both of them are weakly peraluminous. Geochemically, the Wutubulake granites are enriched in Th, Ta, Hr, but depleted in Rb, Ba, K, Sr, P. The REE patterns are characterized by enrichment of LREE[(La/Yb)N =2. 46～ 7. 24], with moderately or significantly Eu negative anomalies. In combination with previous studies, writers concluded that the Wutubulake plutons were formed in continental arc at active extensional continental margin setting related to the subduction of plate.关键词
花岗岩/锆石LA-ICP-MS U-Pb年龄/地球化学/乌吐布拉克/阿尔泰/新疆Key words
granite/ zircon LA-ICP-MS U-Pb dating/ Geochemistry/ Wutubulake/ Altay Mountains/ Xinjiang引用本文复制引用
张志欣,杨富全,柴凤梅,刘锋,耿新霞,吕书君,姜丽萍,钟天智..阿尔泰南缘乌吐布拉克铁矿区花岗质岩石年代学及成因[J].地质论评,2011,57(3):350-365,16.基金项目
本文为"十一五"国家科技支撑计划重点项目(编号2006BAB07802-01)、国土资源大调查项目(编号1212010786006)和国家自然科学基金资助项目(编号40672065)的成果. （编号2006BAB07802-01）
