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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。LAMC-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。
Inner Mongolia Wenqigen Wulan ophiolite melange is the western part of the Suolun mountain - Suzuoqi - Xilinhot ophiolite belt in Inner Mongolia. The rock assemblages include pillow basalt, serpentinite, magnesite, chert, metamorphic powder Sandy clastic rocks, carbonate rocks, rocks of varying sizes of structural rock output. Porphyry basalt with high Na2O, low K2O, enrichment of Th, Ta, Nb, loss of K, Sr, Rb, Yb and other elements, ΣREE content is low, δEu = 1.22 ~ 1.28, showing the mid- . The zircon U-Pb age of LAMC-ICP-MS is 475.8 ± 1.6Ma, which provides new evidence for studying the tectonic evolution of the northern margin of the North China Plate.