CAJ | 학술논문

内蒙古温其根乌兰蛇绿混杂岩是内蒙古索伦山-苏左旗-锡林浩特蛇绿岩带的西段部分,岩石组合包括枕状玄武岩、蛇纹岩、菱镁岩、硅质岩、浅变质粉砂质碎屑岩、碳酸盐岩等,岩石呈大小不等的构造岩块产出.枕状玄武岩具高Na2O、低K2O,富集Th、Ta、Nb,亏损K、Sr、Rb、Yb等元素,∑REE含量低,δEu=1.22~1.28,显示正Eu异常等大洋中脊玄武岩特征.LA-MC-ICP-MS锆石U-Pb年龄为475.8±1.6Ma,为研究华北板块北缘的大地构造演化提供了新的证据.
내몽고온기근오란사록혼잡암시내몽고색륜산-소좌기-석림호특사록암대적서단부분,암석조합포괄침상현무암、사문암、릉미암、규질암、천변질분사질쇄설암、탄산염암등,암석정대소불등적구조암괴산출.침상현무암구고Na2O、저K2O,부집Th、Ta、Nb,우손K、Sr、Rb、Yb등원소,∑REE함량저,δEu=1.22~1.28,현시정Eu이상등대양중척현무암특정.LA-MC-ICP-MS고석U-Pb년령위475.8±1.6Ma,위연구화북판괴북연적대지구조연화제공료신적증거.
The ophiolitic mélange in Wenqigenwulan lies in the western part of Solon Mountain-Sonid Left Banner-Xilin Hot zone in Inner Mongolia. The rocks consist of pillow basalt, serpentinite, magnesitite, silicalite, shallow metamorphic silty clastic rock and carbonate. The rock occurs as different sizes of tectonic blocks. Geochemistry of pillow basalt shows high Na 2O, low K2O, enrich-ment of Th, Ta, Nb,and depletion of K, Sr, Rb, Yb. REE values are low, and δEu values vary from 1.22 to 1.28 with the features of MORB. The zircon U-Pb age is 475.8±1.6Ma. The geology and geochemistry and zircon U-Pb dating of the pillow basalt pro-vide new evidence for the tectonic evolution at the northern edge of North China Craton.