| 北祁连冷龙岭新元古代火山岩的发现及地质地球化学特征和大地构造意义 |
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| 引用本文： | 王星,杜占美,管波,曹守林,张涛.北祁连冷龙岭新元古代火山岩的发现及地质地球化学特征和大地构造意义[J].陕西地质,2008,26(2):55-63. |
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| 作者姓名： | 王星 杜占美 管波 曹守林 张涛 |
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| 作者单位： | 清华大学,青海有色地勘局七队,西宁,810007 |
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| 基金项目： | 青海省大调查项目
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| 摘 要： | 冷龙岭火山岩带位于北祁连中段，在开展1：5万区域矿产调查中发现该火山岩带为由中元古代火山岩、蛇绿岩、新元古代火山岩和奥陶纪火山岩的残块构造拼贴而成，其中新元古代火山岩为由细碧岩和石英角斑岩为主组成的细碧角斑岩系，岩石化学特征具双峰式火山岩的特征，微量元素网图具双隆起分配型式，稀土曲线与北祁连石英角斑岩球粒陨石标准化曲线一致，获得Sm—Nd等时线年龄826±34Ma，表明形成时代为新元古代，地球化学特征显示该套火山岩形成于大陆裂谷环境，这与北祁连东段白银厂含矿火山岩一致，经过对比研究，初步认为冷龙岭火山岩为寻找白银式铜多金属矿的有利地区。
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| 关 键 词： | 新元古代 火山岩 地球化学 北祁连冷龙岭 |
GEOCHEMISTRY AND TECTONICS OF THE NEOPROTEROZOIC VOLCANIC ROCKS DISCOVERED IN LENGLONGLING AREA OF THE NORTHERN QILIAN MOUNTAIN |
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| Wang Xing,Du Zhan-mei,Guan Po,Cao Shou-lin,Zhang Tao.GEOCHEMISTRY AND TECTONICS OF THE NEOPROTEROZOIC VOLCANIC ROCKS DISCOVERED IN LENGLONGLING AREA OF THE NORTHERN QILIAN MOUNTAIN[J].Geology of Shaanxi,2008,26(2):55-63. |
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| Authors: | Wang Xing Du Zhan-mei Guan Po Cao Shou-lin Zhang Tao |
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| Institution: | ( Geological Team No. 7 of the Qinghai Bureau of Geology and Nonferrous Materials, Xining 810007 ) |
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| Abstract: | Lenglongling volcanic belt lies in the which, is composed by Mesoproterozoic volcanic middle of,the northern Qilian Mountains, rocks, ophiolites, Neoproterozoic volcanic rocks and debris structure of Ordovician volcanic rocks in the 1 ： 50, 000 regional.mineral suevey. The Neoproterozoic volcanic rocks is spilite-keratophyre series, mainly composed by spilite rocks and quartz keratophyre. The chemical characteristics of the rock have features of bimodal volcanic rocks. Furthermore, the map of trace elements indicates two-uplift distributional pattern, and rare earth curve is corlsistent with North Qilian Quartz keratophyre chondrite standardization curve, Showing Sm-Nd isochron dating of the volcanic rocks in Neoproterozoic, about 826±34 million years ago The geochemical features indicate that the volcanic rocks formed in the continental rift environment, which fit with the eastern part of the northern Qilian Mountains. According to these, Lenglongling is a favorable area to find copper （polymetallic） as Baiyin mine. |
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| Keywords: | Neoproterozoic volcanic rocks lenglongling of the northern Qilian Mountains |
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