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藏北沉鱼湖-向阳湖一带石坪顶组火山岩特征、形成时代及环境
引用本文:刘荣,吕金刚,吴新忠. 藏北沉鱼湖-向阳湖一带石坪顶组火山岩特征、形成时代及环境[J]. 新疆地质, 2006, 24(2): 109-114
作者姓名:刘荣  吕金刚  吴新忠
作者单位:1. 新疆地质调查院第一地质调查所,新疆,乌鲁木齐,830011
2. 新疆地质调查院第四地质调查所,新疆,昌吉,830011
基金项目:国土资源大调查项目(200313000004)资助.西藏1∶25万玛尔盖茶卡幅(I45C001002)、玉帽山幅(I45C001003)、岗扎日幅(I45C001004)地调项目成果
摘    要:沉鱼湖—向阳湖一带的石坪顶组火山岩大地构造位置属巴颜喀拉-可可西里地块和南部的若拉岗日裂谷带,岩石结构类型比较简单,以粗面安山岩为主,粗面岩、玄武粗安岩、粗面英安岩次之,以钾质太平洋型钙碱性系列为主.火山岩轻、重稀土分馏程度均较高,重稀土分馏程度比轻稀土稍低一些,具轻稀土富集,重稀土亏损的特点,时代属中新世.K2O/Na2O>1,说明成矿物质为深部幔源物质混合了壳源物质,属大陆板内造山晚期演化的火山岩类型.

关 键 词:藏北  沉鱼湖—向阳湖  石坪顶组火山岩  形成时代及环境
文章编号:1000-8845(2006)02-109-06
收稿时间:2005-10-09
修稿时间:2005-11-23

TIME AND ENVIRONMENT OF FORMATION AND GEOCHEMICAL CHARACTERISTICS OF THE CHENYUHU TO XIANGYANGHU SHIPINGDING GROUP VOLCANIC ROCKS IN NORTHERN TIBET
LIU Rong,LU Jing-gang,WU Xing-zhong. TIME AND ENVIRONMENT OF FORMATION AND GEOCHEMICAL CHARACTERISTICS OF THE CHENYUHU TO XIANGYANGHU SHIPINGDING GROUP VOLCANIC ROCKS IN NORTHERN TIBET[J]. Xinjiang Geology, 2006, 24(2): 109-114
Authors:LIU Rong  LU Jing-gang  WU Xing-zhong
Affiliation:1.No. 1 Geological Survey Institute of Xinjiang Geological Survey Academy, Urumqi, Xinjiang, 830011, China; 2. No. 4 Geological Survey Institute of Xinjiang Geological Survey Academy, Changji, Xinjiang, 830011, China
Abstract:The Chenyuhu to Xiangyanghu Shipingding group volcanic rocks are located north of the Hoh Xil Mountains-Bayan Har massif and south of the Ruolagangri Rift Valley Belt. Rock types are simple: trachyandensite, the trachyte, basalt-trachyte, trachyandensite and are typical of the Pacific Ocean calcium alkali series. The volcanic rock is light; the degree of heavy rare earth fractionation is all high and compared to the light rare earth is slightly lower; has light rare earth concentrates and; the heavy rare earth loses are characteristic. The age is Miocene Epoch. K2O/Na2O is greater than 1 and the ore forming material consists of deep seated mantle derived material mixed with crust-derived material. The volcanic rocks formed and evolved during continent intraplate orogeny.
Keywords:Chenyuhu to Xiangyanghu  Shipingding group volcanic rock  formation  environment.
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