塔里木板块东北缘霍布哈尔白山组流纹岩地球化学特征及构造意义
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摘要
探讨塔里木板块东北缘额济纳旗霍布哈尔地区上石炭统白山组流纹岩的形成环境、厘定晚石炭世雅干地区的古大地构造环境。对白山组流纹岩样品开展了岩相学分析以及主元素、痕量元素地球化学分析,结果显示流纹岩SiO_2平均质量分数为75.63%,K_2O/Na_2O比值平均为1.09,里特曼指数δ平均为2.05,属于高钾钙碱性岩石。TiO_2、MgO含量较低(质量分数分别为0.06%～0.17%、0.12%～0.29%),显示壳源岩浆岩的特点。高场强元素Nb、Ta、Ti和P强烈亏损,大离子亲石元素K、Rb、Th和U相对富集,轻重稀土元素分异明显,具明显负铕异常,流纹岩具有大陆边缘火山弧的地化特征。综合岩石组合特征及与西侧白山岩浆弧的对比,认为晚石炭世霍布哈尔地区为大陆边缘火山弧环境。
Lithological and geochemical studies of the Upper Carboniferous Baishan Formation rhyolites in Huobuhaer area of Ejin Banner are carried out so as to discuss its formation environment and determine its tectonic setting. Major and trace element analyses show that the average mass fraction of SiO_(2 )is 75.63%, the mean value of K_2O/Na_2O is 1.09, and the average value of Rittman index is 2.05, characteristic of high-K calc-alkaline type rock. The rhyolites have low TiO_2(0.06%～0.17%) and MgO(0.12%～0.29%) contents, display geochemical characteristics of crust derived magmatic rocks. It shows that the rocks are depleted in high field strength elements, such as Nb, Ta, Ti and P, and obviously enriched in large ion lithophile elements, such as K, Rb, Th and U, with obvious fractionation of light and heavy rare earth elements and with evident Eu negative anomaly. The rhyolites of Baishan Formation are characteristic of continental margin volcanic arc. The comprehensive correlation of rock assemblages and geochemistry with the Baishan magmatic arc on the west side indicate that the Huobuhaer area in the northeastern margin of Tarim Plate displays a continental margin volcanic arc environment in late Carboniferous period.
Lithological and geochemical studies of the Upper Carboniferous Baishan Formation rhyolites in Huobuhaer area of Ejin Banner are carried out so as to discuss its formation environment and determine its tectonic setting. Major and trace element analyses show that the average mass fraction of SiO_(2 )is 75.63%, the mean value of K_2O/Na_2O is 1.09, and the average value of Rittman index is 2.05, characteristic of high-K calc-alkaline type rock. The rhyolites have low TiO_2(0.06%～0.17%) and MgO(0.12%～0.29%) contents, display geochemical characteristics of crust derived magmatic rocks. It shows that the rocks are depleted in high field strength elements, such as Nb, Ta, Ti and P, and obviously enriched in large ion lithophile elements, such as K, Rb, Th and U, with obvious fractionation of light and heavy rare earth elements and with evident Eu negative anomaly. The rhyolites of Baishan Formation are characteristic of continental margin volcanic arc. The comprehensive correlation of rock assemblages and geochemistry with the Baishan magmatic arc on the west side indicate that the Huobuhaer area in the northeastern margin of Tarim Plate displays a continental margin volcanic arc environment in late Carboniferous period.
引文
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[22] Pearce J A,Harris N B W,Tindle A G.Trace-element discrimination diagrams for the tectonic interpretation of Graniti-rocks igneous petrogenesis[J].Journal of Petrology,1984,25(4):956-983.
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[24] 李涤,何登发,樊春,等.东准噶尔早二叠世后碰撞岩浆活动:蕴都卡拉流纹岩SHRIMP U-Pb年代学、地球化学和Hf同位素的制约[J].岩石学报,2013,29(1):317-337.Li D,He D F,Fan C,et al.Early Permian post-collisional magmatic events,East Junggar:Constraints from zircon SHRIMP U-Pb age,geochemistry and Hf isotope of rhyolite in the Yundukala area[J].Acta Petrologica Sinica,2013,29(1):317-337.(in Chinese)
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[27] Taylor S R,McLennan S M.The Continental Crust:Its Composition and Evolution[M].Oxford:Blackwell,1985:91-92.
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