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中文摘要：
铜陵铜官山矿田的中酸性侵入岩属高钾钙碱性系列,主要岩石类型为石英二长闪长岩和花岗闪长岩。本文对该矿田内的铜官山岩体和天鹅抱蛋岩体进行了锆石的SHRIMPU-Pb定年。结果表明,铜官山和天鹅抱蛋石英二长闪长岩的锆石SHRIMPU-Pb年龄几乎相同,分别为141.8±1.0Ma和141.3±1.3Ma,反映它们是同一次岩浆侵入作用的产物。结合锆石CL分析得出,两岩体中均含有新太古代、古元古代和新元古代岩浆型的继承性锆石核,说明本区岩浆的源岩含有古老的下地壳成分,锆石微量及稀土元素特征也表明其为陆壳而非洋壳成因,结合同位素和包体特征,得出岩浆来自富集地幔并含有古老地壳成分。
英文摘要：
The Mesozoic intermediate-acid intrusive rocks in the Tongguashan ore -field belong to the high-potassium （K） calc-alkaline series with main rock t ypes of quartz monzodiorite ＋ granodiorite. Zircon SHRIMP U-Pb dating of Tonggu anshan and Tian＇ebaodan bodies shows that both have almost the same age,being 141.8±1.0 Ma for Tongguanshan and 141.3±1.3 Ma for the Tebodan body,respectiv ely,indicating they are the product of the same magmatism. Zircon cathodolumine scence （CL） analysis also shows that both intrusive bodies all contain ancient m agmatic inherited zircon cores with the times of Neoarchean,Paleoproterozoic an d Neoproterozoic,which were derived from the continental crust not from oceanic crust based on the trace and rare earth elements of the zircons. On the basis o f the previous studies on isotope of the intrusive rocks and enclave petrology i n the rock bodies,it can be concluded that the magma was derived from enriched mantle with some ancient continental materials.
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同项目期刊论文
An Early Paleozoic double- subduction model for the North Qilian oceanic plate: evidence from zircon
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