内蒙古红石山南辉长岩体锆石U-Pb年龄及地质意义  

Zircon U-Pb Age and its geological significance of gabbro in the South Hongshi Mountain,Ejinna,Inner Mongolia Autonomous Region

作　　者：彭海练 高峰 菅坤坤 李宁 赵鹏彬 李武杰 赵端昌 PENG Hai-lian;GAO Feng;JIAN Kun-kun;LI Ning;ZHAO Peng-bin;LI Wu-jie;ZHAO Duan-chang(Shaanxi Center of Mineral Geological Survey,Xi'an 710068)

机构地区：[1]陕西省矿产地质调查中心,西安710068

出　　处：《矿产勘查》2018年第9期1705-1712,共8页Mineral Exploration

基　　金：内蒙古自治区额济纳旗红石山南锑金矿普查项目(编号:07-3-KC06)资助

摘　　要：对红石山南金矿区发现晚古生代辉长岩体,利用锆石LA-ICP-MS方法测得辉长岩锆石谐和年龄为(272. 4±2. 2) Ma。岩石具轻重稀土略微右倾、Eu略富集特征,反映深源或地幔岩浆特点;可能属于哈萨克斯坦板块和西伯利亚板块碰撞拼贴成统一大陆,沿马鬃山中间地体内间歇式拉张,下地壳或上地幔物质熔融上升陆内裂解基性岩浆侵位冷凝,形成带状裂隙式侵入体,反映了内蒙北山地区二叠纪处于裂谷伸展构造背景环境。间接确定红石山南锑金矿床成矿时代属中二叠世,对于北山地区二叠纪指导找矿具有重要意义。The Late Paleozoic gabbro was found in south hongshi mountain gold mining area. Zircon U-Pb age of the late Paleozoic gabbro yield age of 272. 4± 2. 2 Ma.. Geochemical characteristics show the gabbro with slight enrichment of light rare earth elements and slight positive Eu anomalies,suggesting that they may derived from mantle source. It may belong to the collision of the Kazakh plate and the Siberian plate into a unified continentwithintermittent internal tension along the middle body of the Mabin Mountain.Material from the lower crust or upper mantle melts and rises to form the basic magma. The formation of banded fissure intrusive body reflects that the north mountain area of Inner Mongolia is in the background of rift valley extensional structure during Permian. determined that the miner agenetic epoch of ore deposits belongs to middle Permian. It possesses af great significance to guide the prospecting of Permian in Beishan area.

关 键 词：辉长岩体 锆石U—Pb定年 地质意义 红石山南 额济纳旗 

分 类 号：P588.12[天文地球—岩石学]