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狮子山矿田内分布着一系列燕山期岩浆岩 ,岩性主要为辉石闪长岩、石英闪长岩和花岗闪长岩。通过岩相学和地球化学研究 ,表明它们属富碱高钾钙碱性岩系 ,并有类似高Ba -Sr花岗岩的地球化学特征 (如Ba ,Sr和LREE含量高 ,Y和HREE含量较低 ,LREE/HREE强烈分离 ,Nb ,Ta ,Ti强烈亏损 ,无明显的Eu负异常 ,Sr-Nd同位素具有EMⅠ型特征 ) ,由此推断它们具有相同岩浆来源。在区域拉张 -伸展构造域中 ,由富集Ba ,Sr的基性岩浆底侵熔融下地壳 ,并发生了结晶分异作用。
A series of Yanshanian magmatic rocks are distributed in the Lion Rock Mine. The lithology is mainly pyroxene, quartz diorite and granodiorite. Based on petrographic and geochemical studies, they are rich in alkali-rich, high-K calc-alkaline rocks and have similar geochemical characteristics (such as high Ba, Sr and LREE content and low Y and HREE content) , LREE / HREE strongly separated, Nb, Ta, Ti strongly depleted, no obvious Eu negative anomalies, and Sr-Nd isotopes have EM Ⅰ -type features), suggesting that they have the same magma source. In the area of extensional-extensional tectonic domain, the underlying crust is melted by basaltic magmatic enrichment of Ba and Sr, and the crystallization differentiation occurs.