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    新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义

    周刚 张招崇 杨文平 谷高中 张小林 罗世宾 王祥

    周刚, 张招崇, 杨文平, 谷高中, 张小林, 罗世宾, 王祥, 2005. 新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义. 地球科学, 30(6): 738-746.
    引用本文: 周刚, 张招崇, 杨文平, 谷高中, 张小林, 罗世宾, 王祥, 2005. 新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义. 地球科学, 30(6): 738-746.
    ZHOU Gang, ZHANG Zhao-chong, YANG Wen-ping, GU Gao-zhong, ZHANG Xiao-lin, LUO Shi-bin, WANG Xiang, 2005. Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications. Earth Science, 30(6): 738-746.
    Citation: ZHOU Gang, ZHANG Zhao-chong, YANG Wen-ping, GU Gao-zhong, ZHANG Xiao-lin, LUO Shi-bin, WANG Xiang, 2005. Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications. Earth Science, 30(6): 738-746.

    新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义

    基金项目: 

    新疆维吾尔自治区1∶5万区调项目 XJQDW2003-03

    国家“305”项目 2001BA609A-07-02

    详细信息
      作者简介:

      周刚(1966-), 男, 高级工程师, 在职博士研究生, 主要研究方向为岩浆作用与成矿.E-mail: xazhougang@126.com

    • 中图分类号: P588.3

    Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications

    • 摘要: 位于额尔齐斯-玛音鄂博大断裂带南侧的阿热勒托别变质基性岩产于下石炭统姜巴斯套组一套细碎屑沉积岩中.岩石组成以变质玄武岩为主, 它们具有相对高的TiO2、MgO和低SiO2、K2O的特点; 在稀土元素组成上, 显示轻稀土弱富集的配分模式, 无明显Eu异常; 微量元素组成显示大离子亲石元素富集, 并具有明显的正Th异常和弱的Nb负异常、高的Nb含量(> 2×10-6) 以及HFSE基本上和MORB相当的特点; 其Zr/Nb比值落在MORB范围之内, 而Ti/V比值略比MORB高, 表明其为MORB源的亏损地幔在相对较低熔融程度下熔融的产物.其εNd(t) 值为+7.40~+8.35, 略低于MORB, 但高于洋岛以及大陆板内玄武岩.因此该变质基性岩总体上兼有火山弧和洋中脊玄武岩特征, 因而其可能形成于弧后环境, 代表了弧后盆地扩张早期的产物.

       

    • 图  1  阿热勒托别变质基性岩的位置及地质剖面

      Fig.  1.  Simplified geological map and section of the Areletuobie metabasic rocks

      图  2  阿热勒托别变质基性岩岩石的(Zr/TiO2) ×10-4-Nb/Y定名图(Winchester and Floyd, 1977)

      +.阿热勒托别变质基性岩; ◆.卡拉麦里蛇绿岩带中玄武岩; △.阿尔曼太蛇绿岩带中玄武岩; □.库尔提蛇绿岩中玄武岩

      Fig.  2.  (Zr/TiO2) ×10-4 vs. Nb/Y diagram of the Areletuobie metabasic rocks

      图  3  阿热勒托别变质基性岩岩石的(FeO*/MgO) -SiO2图解(底图据Miyashiro, 1974)

      Fig.  3.  (FeO*/MgO) -SiO2 diagram of the Areletuobie metabasic rocks

      图  4  阿热勒托别变质基性岩稀土元素配分曲线(标准化数据据Sun and McDonough, 1989)

      Fig.  4.  Chondrite-normalized REE patterns of the Areletuobie metabasic rocks

      图  5  阿热勒托别变质基性岩微量元素MORB标准化曲线(标准化数据据Sun and McDonough, 1989)

      Fig.  5.  MORB-normalized trace element patterns of the Areletuobie metabasic rocks

      表  1  阿热勒托别变质基性岩的主元素(%)和微量元素(10-6) 成分

      Table  1.   Major and trace element data of the Areletuobie metabasic rocks

      表  2  阿热勒托别变质基性岩Sm-Nd同位素及模式年龄

      Table  2.   Sm-Nd isotopic compositions of the Areletuobie metabasic rocks and their modal ages

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