[1]王秉璋,韩 杰,谢祥镭.2018.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,优先出版:001-11.doi:10.16539/j.ddgzyckx.2019.02.016
 WANG Bingzhang,HAN Jie,XIEXianglei.2018.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,优先出版:001-11.doi:10.16539/j.ddgzyckx.2019.02.016
点击复制

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
分享到:

《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2018年优先出版
页码:
001-11
栏目:
出版日期:
2019-12-30

文章信息/Info

Title:
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
作者:
王秉璋 韩 杰 谢祥镭 陈 静 王 涛 薛万文 白宗海 李善平
青海省地质调查院 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
Author(s):
WANG Bingzhang HAN Jie XIEXianglei CHEN Jing WANG Tao XUE Wanwen BAI Zonghai and LI Shanping
Key Laboratory of the Northern Qinghai–Tibet Plateau Geological Processes and Mineral Resources, Qinghai Geological Survey Institute, Xining 810012, Qinghai, China
关键词:
锂辉石伟晶岩 含绿柱石伟晶岩 Li-Be成矿 锆石U-Pb年龄 Hf同位素地球化学 青藏高原
Keywords:
spodumene pegmatites beryl-bearing pegmatites Li-Be minerlazation zircon U-Pb age Hf isotope geochemistry Tibetan Plateau
分类号:
P618.7, P597, P595
DOI:
10.16539/j.ddgzyckx.2019.02.016
文献标志码:
A
摘要:
在青藏高原东北缘茶卡北山地区首次发现锂辉石伟晶岩脉群。这些伟晶岩脉沿宗务隆山南缘断裂北侧密集出露并呈狭窄的带状北西向展布。到目前为止, 已发现9条含绿柱石锂辉石伟晶岩脉(Li2O平均品位为1.11%~3.13%, BeO平均品位为0.06%)和13条含绿柱伟晶岩(BeO平均品位为0.044%~0.056%)。伟晶岩锆石U-Pb测年确定成岩成矿年龄为217 Ma, 含绿柱石伟晶岩具有高SiO2(71.62%~77.34%)、Al2O3(15.57%~17.55%)和富K2O(1.99%~2.02%)、Na2O(6.09%~6.24%), 稀土总量非常低(∑REE=5.2~9.1 μg/g), 轻稀土略微富集((La/Yb)N=6.8~10.1), Eu具负异常(δEu=0.25~0.92), 具有Cs、Rb、Ta、P和Pb富集, 以及Ba、Th、La、Ce、Sr、Nd和Ti的强烈亏损。锂辉石伟晶岩具有高SiO2(75.73%~77.34%)、Al2O3(15.58%~17.52%)和富Na2O(3.0%~3.16%)、贫K2O(0.36%~0.79%), 稀土总量也很低(∑REE=5.3~6.0 μg/g), 轻稀土略微富集((La/Yb)N=3.1~4.6), Eu具强烈负异常(δEu=0.17~0.23)。相对于含绿柱石伟晶岩, 锂辉石伟晶岩更加富集Cs、U、Nb、Ta、Th、Sn和B, 更亏损K和P。含绿柱石伟晶岩和锂辉石伟晶岩锆石具有相似的Hf同位素组成, εHf(t)值分布范围在–15.1~–12.9, 对应的Hf同位素地壳模式年tDM2为1.99~2.22 Ga, 表明伟晶岩源于全吉地块古元古代地壳物质的重熔再造。茶卡北山(含绿柱石)锂辉石伟晶岩的发现可推断宗务隆山构造带东段是青藏高原北部一条新的、重要的Li、Be成矿带, 除Li和Be外, Nb、Ta、Cs和Sn可能也是有潜力的成矿元素。
Abstract:
The spodumene-bearing pegmatitic dike swarm was firstly discovered in the Chakaibeishan area on the northeastern margin of the Tibetan plateau. These pegmatite dikes are densely exposed and distributed in a narrow NW band along the northern side of the Southern Zongwulong Mountain fault. So far, 9 beryl-bearing spodumene pegmatite veins (the average grade of Li2O is from 1.11% to 3.13%, ) and 13 beryl-bearing pegmatite veins (the average grade of the Beo is from 0.0440% to 0.056%) have been found. Zircon U-Pb dating determined that the diagenesis and mineralization age was 217 Ma. The beryl-bearing pegmatites have high SiO2(71.62% to 77.34%), Al2O3(15.57% to 17.55%), K2O(1.99% to 2.02%) and Na2O(6.09% to 6.24%) contents, low total amount of rare earth elements (REEs) (∑REE value is between 5.2 μg/g and 9.1 μg/g), slight rich in light rare earth ((La/Yb)N=6.8 to 10.1) with negative Eu anomaly (δEu=0.25 to 0.92), as well as enrichment of Cs, Rb, Ta, P, Pb and depletion of Ba, Th, La, Ce, Sr, Nd, Ti. The spodumene pegmatites have high SiO2(75.73% to 77.34%), Al2O3(15.58% to 17.52%) and Na2O(3.0% to 3.16%), low K2O(0.36% to 0.79%) and total amount of REEs(5.3 to 6.0 μg/g), as well as slight enrichment of light rare earth ((La/Yb)N=3.1 to 4.6) with strong Eu negative anomalies (δEu=0.17 to 0.23). Compared with beryl-bearing pegmatites, spodumene pegmatites have more abundant Cs, U, Nb, Ta, Th, Sn and B, and lower K and P contents. These pegmatites have similar zircon εHf(t) values (–15.1 to –12.9) and the corresponding tDM2 (1.99 to 2.22 Ga), indicating the pegmatite possibly originated from the remelting of the palaeoproterozoic crustal materials in the Quanji-block. The discovery of the beryl-bearing spodumene pegmatite in Chakaibeishan area inferred that there should be a new, important Li and Be metallogenic belt in the eastern part of Zongwulong tectonic belt, northern Tibet plateau. In addition to Li and Be, Nb, Ta, Cs and Sn may also be potential metallogenic elements.

参考文献/References:

代鸿章, 王登红, 刘丽君, 于扬, 代晶晶, 付小方. 2018. 川西甲基卡308号伟晶岩脉年代学和地球化学特征及其地质意义. 地球科学, 43(10): 3664-3681.
郝雪峰, 付小方, 梁斌, 袁蔺平, 潘蒙, 唐屹. 2015. 川西甲基卡花岗岩和新三号矿脉的形成时代及意义. 矿床地质, 34(6): 1199-1208.
矿产资源工业要求手册编委会. 2010. 矿产资源工业手册. 北京: 地质出版社: 226-230.
李秋立. 2016. 离子探针锆石U-Pb定年的“高U效应”. 矿物岩石地球化学通报, 35(3): 405-412.
潘桂棠, 肖庆辉, 陆松年, 邓晋福, 冯益民, 张克信, 张智勇, 王方国, 邢光福, 郝国杰, 冯艳芳. 2009. 中国大地构造单元划分. 中国地质, 36(1): 1-28.
王登红, 李建康, 付小方. 2005. 四川甲基卡伟晶岩型稀有金属矿床的成矿时代及其意义. 地球化学, 34(6): 541-547.
王登红, 刘丽君, 代鸿章, 刘善宝, 侯江龙, 吴西顺. 2017. 试论国内外大型超大型锂辉石矿床的特殊性与找矿方向.地球科学, 42(12): 2243-2257.
王核, 李沛, 马华东, 朱炳玉, 邱林, 张晓宇, 董瑞, 周楷麟, 王敏, 王茜, 闫庆贺, 魏小鹏, 何斌, 卢鸿, 高昊. 2017. 新疆和田县白龙山超大型伟晶岩型锂铷多金属矿床的发现及其意义. 大地构造与成矿学, 41(6): 1053-1062.
王勤燕, 陈能松, 李晓彦, 郝爽, 陈海红. 2008. 全吉地块基底达肯大坂岩群和热事件的LA-ICPMS锆石U-Pb定年. 科学通报, 53(14): 1693-1701.
许志琴, 王汝成, 赵中宝, 付小方. 2018. 试论中国大陆“硬岩型”大型锂矿带的构造背景. 地质学报, 92(6): 1091-1106.
燕洲泉, 王怀涛, 李元茂, 王记周, 李侃, 王玉玺, 任文秀, 余超, 周煜祺. 2018. 西昆仑大红柳滩伟晶岩型锂铍矿产资源潜力评价. 甘肃地质, 27(3-4): 42-48.
赵振华, 包志伟, 乔玉楼. 2010. 一种特殊的“M”与“W”复合型稀土元素四分组效应: 以水泉沟碱性正长岩为例.科学通报, 55(15): 1474-1488.
Anderson T. 2002. Correction of common lead in U-Pb analyses that do not report 204Pb. Chemical Geology, 192(1-2): 59-79.
Chen N S, Gong S L, Sun M, Li X Y, Xia X P , Wang Q Y, Wu F Y and Xu P. 2009. Precambrian evolution of the Quanji Block, northeastern margin of Tibet: Insights from zircon U-Pb and Lu-Hf isotope compositions. Journal of Asian Earth Sciences, 35: 367-376.
Gong S L, Chen N S, Wang Q Y, Kusky T M, Wang L, Zhang L, Ba J and Liao F X. 2012. Early Paleopro?terozoic magmatism in the Quanji Massif, northeastern margin of the Qinghai?Tibet Plateau and its tectonic significance: LA-ICPMS U-Pb zircon geochronology and geochemistry. Gondwana Research, 21(1): 152- 166.
Lu S N, Li H K, Zhang C L and Niu G H. 2008. Geological and geochronological evidence for the Precambrian evolution of the Tarim Craton and surrounding continental fragments. Precambrian Research, 160: 94-107.
Sun S S and McDonough W F. 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes // Saunders A D and Norry M J. Magmatism in the Ocean Basins. Geological Society, London, Special Publications, 42(1): 313-345.
Wu F Y, Yang Y H, Xie L W, Yang J H and Xu P. 2006. Hf isotope compositions of the standard zircons and baddeleyites used in U-Pb geochronology. Chemical Geology, 234(1-2): 105-126.

备注/Memo

备注/Memo:
收稿日期: 2019-04-01; 改回日期: 2019-05-16
项目资助: The Second Tibetan Plateau Scientific Expedition and Research(STEP)(2019QZKK0702)、青海省地质矿产勘查开发局计划项目(青海省乌兰县察汗诺?茶卡北山地区1∶25000地球化学测量)和青海省地质勘查基金(2018353008kc002)联合资助。
第一作者简介: 王秉璋(1969–), 男, 博士, 正高级工程师, 从事区域地质矿产调查。Email: wbz6901@126.com
更新日期/Last Update: 2019-05-22