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内蒙古呼都格高勒似斑状黑云正长花岗岩体位于宁夏与内蒙古交界的贺兰山北段,岩石类型相对单一,Si O2含量62.93%~70.86%,A/CNK介于0.98~1.14,属过铝质碱性花岗岩。LREE富集强烈,具强烈的铕负异常。锆石UPb LA-MC-ICP-MS年龄为1 950Ma,为古元古代产物。通过似斑状黑云正长花岗岩地球化学特征、图解判别等的综合研究,认为该岩体属上地壳深熔花岗岩,形成于阴山陆块与鄂尔多斯陆块碰撞构造环境。
The Huodigogole plagioclase granite in Inner Mongolia is located at the northern part of Helan Mountain at the junction of Ningxia and Inner Mongolia. The rock types are relatively simple with Si O2 content of 62.93% ~ 70.86% and A / CNK of 0.98 ~ 1.14. Alkaline granite. LREE is strongly concentrated and has strong negative anomalies of europium. The zircon UPb LA-MC-ICP-MS is 1 950Ma, which is an ancient palaeontology product. Based on the comprehensive study of the geochemical characteristics of granodiorite-like granodiorites and the graphical discrimination, it is believed that the pluton belongs to the upper crust and the deep-melt granite is formed in the collisional tectonic setting of the Yinshan and Ordos continental blocks.