内蒙古太仆寺旗卧牛山花岗岩锆石年龄、微量元素特征及其地质意义
Zircon geochronology and trace element characteristics of the Woniushan granites in Taibus Ban-ner, Inner Mongolia, and their geological significance
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摘要: 内蒙古太仆寺旗卧牛山花岗岩位于华北板块北缘晚古生代-早中生代岩浆岩带中段。卧牛山岩体LA-ICP-MS锆石206Pb/238U年龄加权平均值为274.7±1.2Ma(MSWD=0.82),非前人认为的侏罗纪。锆石稀土元素总量为362.67×10-6~1177.09×10-6,平均为797.91×10-6,各分析点的稀土元素球粒陨石标准化配分模式高度一致,富集重稀土元素,亏损轻稀土元素,具明显的正Ce异常及负Eu异常。基于锆石的稀土元素特征,通过构造背景及结晶环境判别图解、Ti温度计,结合区域地质背景及岩浆岩特征分析,认为卧牛山花岗岩为壳幔混源,形成于古亚洲洋向华北板块俯冲的构造-岩浆活动中,是活动大陆边缘的产物,与华北板块北缘晚古生代-早中生代岩浆岩带东、西段二叠纪岩体的源区及构造背景一致。研究成果确认了华北板块北缘晚古生代-早中生代岩浆岩带中段与其东、西两段在海西晚期具有相同的成因联系。Abstract: The Woniushan granite in Taibus Banner of Inner Mongolia is located in the middle part of the Late Paleozoic-Early Me-sozoic magmatic belt on the northern margin of the North China plate. The weighted average age of 206Pb/238U by LA-ICP-MS of zircon from Woniushan pluton is 274.7±1.2Ma (MSWD=0.82), indicating that the pluton is not the Jurassic in age as previously con-sidered. The ΣREE values of zircon are 362.67×10-6~1177.09×10-6 with an average of 797.91×10-6. The REE patterns of all zircon grains are highly consistent, characterized by enrichment of HREE, depletion of LREE, and obvious positive Ce and negative Eu anomalies. Through the analysis of REE characteristics, diagrams of tectonic setting, crystallization environment, and Ti thermometer in zircon, combined with regional geological setting and magmatic characteristics, the authors hold that the Woniushan granite, as the mixture of crust and mantle, was formed during the tectonic-magmatic activities of paleo-Asian Ocean subducting to the Northern North China plate, being the product of active continental margin, and the source and tectonic setting of the Woniushan granite were similar to those of the Permian magmatite in eastern and western parts of the Late Paleozoic-Early Mesozoic magmatic belt on the northern margin of the North China plate. The results confirm that, in late Hercynian period, the genetic relationship of the mag-matite of the middle part of the Late Paleozoic-Early Mesozoic magmatic belt on the northern margin of North China plate was the same as that of the eastern and western parts.
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