阿尔金中段吐格曼地区花岗伟晶岩型稀有金属成矿特征与找矿预测  

Metallogenic characteristics and prospecting of granitic pegmatite-type rare metal deposits in the Tugeman area,middle part of Altyn Tagh

作　　者：徐兴旺[1,2,3] 李杭 石福品 姚佛军[5] 陈建中 杨智全[4] 洪涛 柯强 XU XingWang;LI Hang;SHI FuPin;YAO FoJun;CHEN JianZhong;YANG ZhiQuan;HONG Tao;KE Qiang(Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institutions of Earth Science,Chinese Academy of Sciences,Beijing 100029,China;No.3 Geological Party,Xinjiang Bureau of Geology and Mineral Exploration and Development,Korla 841000,China;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029 [2]中国科学院大学,北京100049 [3]中国科学院地球科学研究院,北京100029 [4]新疆地矿局第三地质大队,库尔勒841000 [5]中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京100037

出　　处：《岩石学报》2019年第11期3303-3316,共14页Acta Petrologica Sinica

基　　金：第二次青藏高原综合科学考察研究和新疆地勘基金项目(K13-3-XJ059)联合资助

摘　　要：新疆若羌县阿尔金中段吐格曼地区是花岗伟晶岩型稀有金属成矿的有利地区,目前已发现吐格曼铍锂矿、吐格曼北锂铍矿和瓦石峡南锂铍矿,其中发育于吐格曼层状花岗岩中心的吐格曼铍锂矿和北部接触带的吐格曼北锂铍矿已达中型规模。本文总结了吐格曼地区稀有金属花岗伟晶岩的类型,报导了吐格曼铍锂矿和吐格曼北锂铍矿伟晶岩的特征与形成时代。并基于ASTER遥感岩体与伟晶岩光谱信息提取成果揭示花岗岩与花岗伟晶岩的分布,指出托巴片麻状二长花岗岩中段花岗伟晶岩区以及阿亚格黑云斜长花岗岩南接触带花岗伟晶岩群是稀有金属找矿靶区,指出吐格曼铍锂矿花岗伟晶岩形成于中奥陶世晚期(460Ma)南阿尔金洋闭合后阿中地块与柴达木地块碰撞过程的后碰撞阶段。The middle part of Altyn Tagh,Ruoqiang County,Xinjiang,is a favorable area for granitic pegmatite-type rare metal mineralization. At present,the Tugeman Be-Li,Tugeman North Li-Be and Washixia South Li-Be deposits have been discovered.Among them,the Tugeman Be-Li and Tugeman North Li-Be ore deposits,occurred in middle and northern part of the Tugeman layered granite,had been evaluated to be medium scale. This paper summarizes types of rare metal granitic pegmatites in the Turgman area,and introduces characteristics and formation ages of the Turgman Be-Li and Turgman North Li-Be deposits. Distribution of granite and granitic pegmatite were revealed based on granitic and pegmatitic spectral information extraction of ASTER remote sensing data. It is pointed out that the Tuoba and Ayag granitic pegmatite groups in the middle part of Tuoba gneissic monzonitic granite and south contact zone of the Ayag biotite-plagioclase granite,respectively,are two potential rare metal prospecting targets. The corresponding dominant rare-metal minerals for the Tugeman Be-Li,Tugeman North Li-Be,and Washixia South Li-Be deposits were beryl,spodumene and lepidolite,respectively. The Tugeman Be-Li granitic pegmatites are characterized by development of K-feldspar,whereas albite crystals are major rock-forming minerals in the Tugeman North Li-Be and Washixia South Li-Be deposits. The Tugeman Be-Li granitic pegmatites were emplaced along some shear fractures or faults with dendritic or echelon shape,some pegmatites contain typical zoning with border aplite zone,intermediate K-feldspar zone,core-margin tourmaline-beryl zone and quartz core. Moreover,the Tugeman BeLi granitic pegmatite deposit was formed in late Middle Ordovician( ca. 460 Ma) during post-collision stage of the collision between the Middle Altyn block and Qaidam block after the closure of the southern Altyn Ocean.

关 键 词：阿尔金山中段 吐格曼 稀有金属 花岗伟晶岩 找矿预测 

分 类 号：P612[天文地球—矿床学] P618.6[天文地球—地质学]