阿尔泰加里东期变质成因伟晶岩型白云母矿床的成矿年代证据及其意义  

Chronological Study of Caledonian Metamorphic Pegmatite Muscovite Deposits in the Altay Mountains, Northwestern China, and Its Significance

作　　者：王登红[1] 陈毓川[2] 徐志刚[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质科学院,北京100037

出　　处：《地质学报》2001年第3期419-425,共7页Acta Geologica Sinica

基　　金：国家305项目96-915-01-02专题的成果

摘　　要：本次工作通过野外调查和同位素年代学研究,首次在阿尔泰西部的也拉曼大型含绿柱石白云母矿床(426±13Ma)、阿尔泰中部的那森恰大型含绿柱石白云母矿床(447.7±0.4Ma)及阿尔泰东部的青河拜兴白云母伟晶岩脉(436.0±0.5Ma)中获得了可靠的加里东期成矿的同位素年代证据,从而为解决是否存在加里东期成矿的问题提供了重要依据,并进一步认识到阿尔泰地区的伟晶岩及伟晶岩型稀有金属-白云母矿床并非只形成于海西期。Rare metal-muscovite deposits in the Altay Mountains, northwestern China, have long been taken as the product of Hercynian orogenesis. Through field investigations and isotope chronological study, the authors have for the first time obtained some isotope chronological data indicating Caledonian mineralization in the study area, i. e. : the Yelaman large beryl-bearing muscovite deposit in the eastern Altay Mountains was formed at 426±13 Ma, the Nasenqia large beryl-bearing muscovite deposit in the central Altay Mountains was formed at 447. 7±0. 4 Ma, and the Baixing muscovite-pegmatite dike at Qinghe in the eastern Altay Mountains was formed at 436. 0 ± 0. 5 Ma. These isotopic data provide important evidence for solving the problem of whether there occurred Caledonian mineralization and further support the view that pegmatites and pegmatite rare metal-muscovite deposits in the Altay area were not only formed in the Hercynian. Considering that the three deposits are located in the western, central and eastern Altay Mountains, the authors think that Caledonian mineralization is widespread.

关 键 词：加里东期 稀有金属-白云母矿床 同位素年代 铷-锶等时线 成矿年代 氩同位素 

分 类 号：P619.273[天文地球—矿床学]