豫西崤山老里湾岩体年代学、地球化学特征及其成矿作用

发布时间：2018-06-16 04:49

本文选题：老里湾岩体 + Rb-Sr年代学　；参考：《地质通报》2017年07期

【摘要】：豫西崤山老里湾岩体位于华北陆块南缘崤山地区东部,是河南省地矿局地矿一院近年新发现的二长花岗岩体。岩体内部已发现多个矿体,为探寻岩体的形成机制及其与成矿作用的关系,对岩体进行了岩石学、年代学、地球化学及岩体内部矿化特征研究,揭示其形成机制及成矿作用。全岩Rb-Sr定年结果显示,老里湾岩体的侵位时间是149±11Ma。岩体的地球化学特征总体表现为高硅、高铝、富碱、低镁的钾玄质、准铝质-过铝质花岗岩;轻稀土元素富集,重稀土元素亏损,轻、重稀土元素强烈分异;δ Eu=0.62~0.66,具有中等的负Eu异常,富集Rb、Th、U、K等大离子亲石元素,Nb、Ta、P、Ti等高场强元素亏损;岩体具有中等含量Sr,低Yb、Y,揭示源区除石榴子石外还有斜长石残留;岩体形成于加厚地壳向正常地壳减薄的环境。岩体内部矿化特征具有斑岩型矿床的特征,成矿时代属晚侏罗世,老里湾岩体成矿是豫西地区晚侏罗世成矿事件在崤山东部地区的地质响应。老里湾岩体与成矿作用关系密切,找矿前景较好,岩体周边地区应被视为崤山东部重点找矿靶区之一。
[Abstract]:The Laoliwan rock body of Xiaoshan Mountain in western Henan Province is located in the eastern part of Xiaoshan area on the southern margin of the North China Continental Block. It is a newly discovered monzomorphic granite body recently discovered by the Geology and Mining Bureau of Henan Province. Several orebodies have been found in the rock mass. In order to explore the formation mechanism of the rock mass and its relationship with mineralization, the petrology, geochronology, geochemistry and mineralization characteristics of the rock mass have been studied, and the formation mechanism and mineralization of the rock mass have been revealed. The Rb-Sr dating results of the whole rock show that the emplacement time of Laoliwan is 149 卤11 Ma. The geochemical characteristics of the rock mass are generally characterized by high silicon, high aluminum, alkali rich, low magnesium kalanite, quasialuminum-peraluminous granites, light REE enrichment, heavy REE depletion, light REE, The heavy rare earth elements are strongly differentiated, 未 -EU 0.62 ~ 0.66, with moderate negative EU anomalies, enriched in Rbn, Th, U, K and other large ion lithophile elements, such as the depletion of high field strength elements, such as NbPU, Ti, etc. The rock mass has moderate content of Sr and low YbCY, which reveals that plagioclase remains in the source area besides pomegranate. The rock mass is formed in an environment where the thickened crust is thinned to the normal crust. The ore-forming age of the ore-forming age belongs to the late Jurassic. The ore-forming of Laoliwan is the geological response of the late Jurassic metallogenic event in the eastern part of Xiaoshan. The Laoliwan rock mass is closely related to metallogeny and the prospecting prospect is good. The surrounding area of the rock mass should be regarded as one of the important ore-prospecting targets in XiaoShandong.
【作者单位】：中国地质大学地球科学与资源学院;河南省地质矿产勘查开发局第一地质矿产调查院;中国地质调查局发展研究中心;
【基金】：河南省地质勘查基金(周转金)招标项目《河南省崤山地区1:5万区域矿产调查(2012)》(编号:豫国土资发[2009]93号)
【分类号】：P588.12;P611

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