山东牟平-乳山金成矿带南段煌斑岩成因机制研究
投稿时间:2018-05-29  修订日期:2018-07-11  点此下载全文
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作者单位E-mail
祝德成 山东省地质调查院 zhudecheng1038@126.com 
韩振玉 烟台市国土资源局 zhudecheng1038@126.com 
田瑞聪 山东省地质调查院  
张业智 山东省煤田地质规划勘察研究院  
杨振毅 山东省地质调查院  
张文 山东省地质调查院  
基金项目:国家重点研发计划(2017YFC0601506)、山东省重点研发计划(2017CXGC1606)及山东省地质勘查项目“山东牟平-乳山中生代脉岩与金矿成矿作用研究”共同资助
中文摘要:山东牟平-乳山金成矿带东南部发育大量的煌斑岩脉,主要为云斜煌岩和斜煌岩。本文选择牟乳带南段冯家镇地表出露的煌斑岩样品进行LA-ICP-MS锆石U-Pb年代学和全岩主微量元素研究。 定年结果表明其成岩年龄为150.6±6.1Ma,属晚侏罗世。煌斑岩SiO2=47.15%~58.91 %,碱性岩系列,岩石为玄武质安山岩,属于太平洋型(钠质)火山岩。岩石具有富集大离子亲石元素(LILE)和轻稀土元素(LREE)、相对亏损高场强元素(HFSE)的特征。成岩过程中黑云母、角闪石、单斜辉石和少量的斜长石的分离结晶作用,研究认为该区的煌斑岩是来自于古太平洋板块的俯冲背景下幔源岩浆上侵,同时受到了壳源物质的混染。
中文关键词:煌斑岩  锆石U-Pb定年  地球化学  岩石成因  牟乳断裂带
 
Forming mechanism of lamprophyre of in the southeast of Muping-rushan Fault in Shandong Province
Abstract:There are a large number of lamprophyre in the southeastern part of Muping-Rushan fault belt, which mainly include kersantite and fraidronite. In this paper, methods by geochemistry and Zircon LA-ICP-MS U-Pb Dating, the surface lamprophyre of the town of Feng Jia were selected to do the study. The dating shows that the diagenetic age is 150.6±6.1Ma, which belongs to the late Jurassic magmatic activity. Geochemical results show that the lamprophyres contain SiO2=47.15%-58.91%, alkaline rock series, the rocks are basaltic andesite, belong to the Pacific type (sodium) volcanic rocks. The rock has the characteristics of enrichment of large ion lithophile elements (LILE) and light rare earth elements (LREE),relatively depleted high field strength elements (HFSE). The crystallization of biotite, amphibole, clinopyroxene and a small amount of plagioclase during diagenesis. Lamprophyres is,In the subduction of the paleo-Pacific plate, formed by Mantle derived magma intrusion, which is contaminated by crustal source material.
keywords:lamprophyre  zircon U-Pb dating  geochemistry  petrogenesis  Muping-Rushan fault belt
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