内蒙古黄岗梁铁锡矿床成岩、成矿时代与构造背景  

Petrogenetic and metallogentic ages and tectonic setting of the Huanggangliang Fe-Sn deposit,Inner Mongolia

作　　者：翟德高[1] 刘家军[1] 杨永强[1] 王建平[1] 定立[1] 刘星旺[1] 张梅[1,2] 要梅娟[1] 苏犁[3] 张红雨[3] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]内蒙古自治区地质调查院,内蒙古呼和浩特010020 [3]中国地质大学科学研究院,北京100083

出　　处：《岩石矿物学杂志》2012年第4期513-523,共11页Acta Petrologica et Mineralogica

基　　金：中国地质调查局地质矿产调查评价专项计划项目(1212011085471);国家自然科学基金资助项目(40973035);高等学校科技创新引智计划资助项目(B07011)

摘　　要：内蒙古黄岗梁铁锡矿床位于大兴安岭成矿带中南段,是一个典型的夕卡岩型多金属矿床。为了精确厘定该矿床的成岩、成矿时代,对与成矿关系密切的花岗岩进行了锆石LA-ICP-MS U-Pb年代学研究,结合矿石中辉钼矿的Re-Os等时线年龄,对该矿床形成的地球动力学背景进行了深入的探讨。花岗岩锆石LA-ICP-MS年代学研究表明花岗岩的结晶年龄为139.96±0.87 Ma,是早白垩世岩浆活动的产物。矿床辉钼矿Re-Os等时线年龄为134.9±5.2Ma,成岩和成矿时代在误差范围内基本一致,均处于燕山期大规模中酸性岩浆活动期内。综合矿床地质特征、成岩成矿时代和区域构造演化,认为黄岗梁铁锡矿床形成于大兴安岭成矿带140 Ma左右的锡多金属成矿高峰期,矿床形成于由全面的挤压向伸展过渡阶段的构造背景。Located in middle-southern section of the Da Hinggan Ling metallogenic belt,the Huanggangliang Fe-Sn deposit is a typical skarn deposit.In order to determine the petrogenetic and metallogentic ages of the deposit,the authors emphatically studied zircon LA-ICP-MS and molybdenite Re-Os chronology of the granite.Combined with the precise chronological data,this paper discussses in detail the geodynamic setting of the deposit.Zircon LA-ICP-MS analysis of the granite shows that the crystallization age of the granite is 139.96±0.87 Ma,indicating that the granite related to mineralization resulted from magmatism in early Cretaceous period.The molybdenite Re-Os dating gives an isochron age of 134.9±5.2 Ma,which indicates that the metallogentic and petrogenetic ages are consistent with each other.Isotopic chronology demonstrates that both the Huanggangliang Fe-Sn deposit and the associated granite are products of magmatic activities in the Yanshanian period.Combined with ore deposit geology and mineralization epoch as well as regional tectonic evolution,the authors have reached the conclusion that the formation of the Huanggangliang Fe-Sn deposit in the Da Hinggan Ling region occurred at the peak metallogenic stage of 140 Ma.The tectonic setting of the deposit was in the transition period from lithosphere compression to extension

关 键 词：夕卡岩型矿床 LA-ICP-MS Re-Os等时线 燕山期 黄岗梁 内蒙古 

分 类 号：P597.3[天文地球—地球化学] P588.121[天文地球—地质学]