[1]李五福,李善平,王秉璋.2021.青海三江北段草陇(绿柱石-)锂辉石花岗伟晶岩的发现及其Li-Be找矿意义.大地构造与成矿学,优先出版:001-23.doi:10.16539/j.ddgzyckx.2021.05.021
　LI Wufu,LI Shanping,WANG Bingzhang.2021.Discovery of the (Beryl-bearing) Spodumene Pegmatite in the Caolong Area in the Sanjiang Northern Section of the Qinghai: Implications for Li-Be Mineralization.Geotectonica et Metallogenia,优先出版:001-23.doi:10.16539/j.ddgzyckx.2021.05.021
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青海三江北段草陇(绿柱石-)锂辉石花岗伟晶岩的发现及其Li-Be找矿意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2021年优先出版
页码:
001-23
栏目:
出版日期:
2022-12-30

文章信息/Info

Title:
Discovery of the (Beryl-bearing) Spodumene Pegmatite in the Caolong Area in the Sanjiang Northern Section of the Qinghai: Implications for Li-Be Mineralization
作者:
李五福1;  李善平1 ;  王秉璋1;  王春涛1;  刘金恒2;  张新远1;  曹锦山1;  许传兵2;  刘建栋1;  金婷婷1
1.青海省地质调查院, 青海省青藏高原北部地质过程与矿产资源重点实验室, 青海 西宁810012; 2.中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广东 广州 510640
Author(s):
LI Wufu1;  LI Shanping1;  WANG Bingzhang1;  WANG Chuntao1;  LIU Jinheng2;  ZHANG Xinyuan1;  CAO Jingshan1;  XU Chuanbing2;  LIU Jiandong1 and JIN Tingting1
1. Qinghai Provincial Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources, Qinghai Geological Survey Institute, Xining 810012, Qinghai, China; 2. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
关键词:
(含绿柱石Li-Be-)锂辉石伟晶岩;  Li-Be成矿;  成矿时代;  高分异花岗岩伟晶岩;  三江北段
Keywords:
(beryl-bearing) spodumene pegmatite;  Li-Be mineralization;  mineralization age;  highly fractionated granitic pegmatite;  northern Sanjiang region
分类号:
P595, P597
DOI:
10.16539/j.ddgzyckx.2021.05.021
文献标志码:
A
摘要:
马尔康-雅江-喀喇昆仑巨型锂矿带是一条Li-Be-Ta稀有元素超常富集带。该成矿带西段西昆仑和东段川西地区均已发现伟晶岩型锂-铍-钽矿床, 但其间还未有此类型矿床的发现。本文对该成矿带中段新发现的青海三江北段草陇(绿柱石-)锂辉石花岗伟晶岩开展了系统的岩石学、地球化学及年代学研究。伟晶岩Li2O和BeO品位分别为0.95%~3.8%和0.05%~1.48%, 显示了良好的含矿性。伟晶岩具有高SiO2含量(69.88%~79.77%)、低P2O5含量(0.05%~0.58%)和高分异指数(DI=93.7~97.5)以及低铁、镁、钙、钛含量地球化学特征; 微量元素表现为富集K、Rb、Th、U、Pb等大离子亲石元素, 亏损Ba、Nb、Sr、Ce、Eu和Ti, Zr含量低(7.49×10-6~55.6×10-6), 且Zr/Hf比值(13~28)低和Rb/Sr比值(2.4~76)高; 稀土元素总量较低, 具轻稀土元素富集配分曲线, 轻、重稀土元素分馏弱, 发育Ce、Eu呈负异常, 显示出岩浆演化晚期高度分异特性。锆石206 Pb/238 U年龄为110~138 Ma; 独居石U-Pb年龄介于204~200 Ma, 表明花岗伟晶岩是晚三叠世岩浆活动的产物。锆石εHf(t)值为-7.97~-13.6, 一阶段模式年龄(tDM1)为0.98~1.58 Ga, 地壳模式年龄(tDMC)为1.58~1.94 Ga, 源区可能为古老地壳。草陇(绿柱石-)锂辉石花岗伟晶与西昆仑大红柳、白龙山和川西甲基卡、马尔康等晚三叠世含锂辉石花岗伟晶伟晶岩的形成时代一致, 共同构成了完整的马尔康-雅江-喀喇昆仑巨型锂矿带印支期Li-Be-Ta稀有金属成矿带。草陇(绿柱石-)锂辉石伟晶岩的发现, 进一步说明马尔康-雅江-喀喇昆仑巨型锂矿带成矿潜力巨大, 同时也拓展了青藏高原北部伟晶岩型 Li-Be 矿的找矿空间。
Abstract:
Songpan-Garzê orogenic belt is a super-large lithium (Li) ore zone that is extremely enriched in lithium-beryllium-tantalum rare elements. The study area (i.e., Caolong area) is located in the central part of Songpan-Garzê orogenic belt. Fifteen beryl- and spodumene-bearing pegmatite veins with average Li2O grade of 0.95% to 3.8%, BeO grade of 0.05% to 1.48% have been discovered. We conducted petrographic, geochemical, and geochronological analyses of the Caolong beryl- and spodumene-bearing pegmatite veins in the northern Sanjiang section. The results show that the granitic pegmatite dikes have high SiO2 contents (69.88% to 79.77%), high differentiation index (DI=93.7 to 97.5) and low P2O5 contents (0.05% to 0.58%). They are characterized by high Si, calc-alkaline, high differentiation, and low contents of Fe, Mg, Ca, and Ti. They are enriched in large ion lithophile elements (e.g., K, Rb, Th, U, and Pb) and are depleted in Ba, Nb, Sr, Ce, Eu, and Ti. They also have low Zr contents (7.49×10-6 to 55.6×10-6), Zr/Hf ratios (13 to 28), and high Rb/Sr ratios (2.4 to 76). In addition, they contain low rare earth element contents. They have rare earth element (LREE) enrichment with obvious fractionation between light and heavy rare earth elements, negative Ce anomaly, and negative Eu anomaly. These characteristics collectively suggest that their magma is highly differentiated during late-stage magma evolution. Zircons contain high contents of U and Th and have wide range of 206Pb/238U, yielding peak ages of 110 to 138 Ma. Monazites yield U-Pb age of 204 to 200 Ma, indicating that the pegmatites were the products of the Late Triassic magmatic activity.The analyzed zircons have low initial εHf(t) values of -7.97 to -13.6, with one-stage model ages of 0.98 to 1.58 Ga and crustal model ages of 1.58 to 1.94 Ga, suggesting that they were derived from an ancient crustal source. These results show that the granitic pegmatites were mainly formed in the Late Triassic under a relatively stable tectonic background after the Indosinian movement. The discovery of the Caolong beryl- and spodumene-bearing pegmatites indicates that the northern Sanjiang region is a new and important Li-Be metallogenic belt in the northern Tibetan Plateau. The exploration space of pegmatite-type Li-Be deposits in the northern Tibetan Plateau has been greatly expanded.

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[1]王秉璋,韩 杰,谢祥镭.青藏高原东北缘茶卡北山印支期(含绿柱石)锂辉石伟晶岩脉群的发现及Li-Be成矿意义.大地构造与成矿学,2021.优先出版:001.doi:10.16539/j.ddgzyckx.2019.02.016
　WANG Bingzhang,HAN Jie,XIEXianglei.The Discovery of the Indosinian (Beryl-bearing) Spodumene Pegmatitic Dike Swarm in the Chakaibeishan Area on the Northeastern Margin of the Tibetan Plateau: Implications for Li-Be Mineralziation.Geotectonica et Metallogenia,2021.优先出版:001.doi:10.16539/j.ddgzyckx.2019.02.016
[2]王秉璋,韩 杰,谢祥镭.青藏高原东北缘茶卡北山印支期(含绿柱石)锂辉石伟晶岩脉群的发现及Li-Be成矿意义.大地构造与成矿学,2020.44(1):069.doi:10.16539/j.ddgzyckx.2019.02.016
　WANG Bingzhang,HAN Jie,XIE Xianglei.Discovery of the Indosinian (Beryl-bearing) Spodumene Pegmatitic Dike Swarm in the Chakaibeishan Area in the Northeastern Margin of the Tibetan Plateau: Implications for Li-Be Mineralization.Geotectonica et Metallogenia,2020.优先出版:069.doi:10.16539/j.ddgzyckx.2019.02.016

备注/Memo

备注/Memo:
收稿日期: 2021-10-31; 改回日期: 2021-12-02
项目资助: 第二次青藏高原综合科学考察研究项目(2019QZKK0702)、青海省地质矿产勘查开发局项目(青地矿科[2021]59号)资助。
第一作者简介: 李五福(1982-), 男, 硕士, 高级工程师, 从事区域地质调查研究。Email: 15422504@qq.com
通信作者: 李善平(1972-), 男, 硕士, 教授级高工, 从事区域地质调查研究。Email: lishanping@163.com
更新日期/Last Update: 2021-12-07