小兴安岭-张广才岭成矿带斑岩型钼矿床岩石地球化学特征及其年代学研究  

Geological and geochemical features and geochronology of porphyry molybdenum deposits in the Lesser Xing’an Range-Zhangguangcai Range metallogenic belt

作　　者：杨言辰[1] 韩世炯[1] 孙德有[1] 郭嘉[1] 张苏江[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《岩石学报》2012年第2期379-390,共12页Acta Petrologica Sinica

基　　金：中国地质调查局地质大调查项目(1212011120342;1212010786005);国家自然科学基金项目(40972065)联合资助

摘　　要：小兴安岭-张广才岭是国内重要的钼成矿带之一,但有关该区的钼矿床尚缺乏系统的地质地球化学及其成矿地球动力学的研究资料。本文选取了霍吉河、鹿鸣及翠岭钼矿床开展相关研究,结果表明:含矿岩体及围岩为偏铝质-过铝质,属高钾钙碱性系列;富集大离子亲石元素(LILE)、亏损高场强元素(HFSE),具有与俯冲带岩浆岩地球化学相似的特征。锆石LA-ICPMSU-Pb定年显示,与霍吉河钼矿床成矿有关的黑云母二长花岗岩形成于早侏罗世(186±1.7Ma),与鹿鸣钼矿床成矿有关的二长花岗岩形成于中侏罗世(176±2.2Ma);与翠岭钼矿床有关的黑云角闪石英二长岩形成于早侏罗世(178±0.7Ma)。因此,小兴安岭-张广才岭成矿带斑岩型钼矿的成矿时代为燕山早期。综合研究认为小兴安岭-张广才岭成矿带斑岩型钼矿床的形成可能与侏罗纪太平洋板块的俯冲和佳木斯与松嫩地块的拼合有着密切的关系。The Lesser Xing’an Range is an important molybdenum metallogenic belt in China,but as for the formed molybdenum deposit,there is the lack of research concerned with its geological,geochemical and dynamic significance.The molybdenum deposit in Huojihe,Luming and Cuiling has been chosen to conduct related research in this thesis.The results show that ore-bearing porphyries and surrounding rocks is metaluminous or peraluminous,so they pertain to high potassium calcium alkaline series.The enrichment of large-ion lithophile elements（LILE） and the absence of high field strength elements（HFSE） ,which is compatible with the geochemical features of subduction magma.Study on LA-ICP-MS U-Pb zircon indicates that in Huojihe molybdenum deposit,the black mica two long granites related with metallogenesis are formed in Early Jurassic（186±1.7Ma） ;in Luming molybdenum deposit,monzonitic granites related with metallogenesis are formed in Middle Jurassic（176±2.2Ma） ;in Cuiling molybdenum deposit,dark clouds angle amphibole quartz two long rocks are formed in Early Jurassic（178±0.7Ma） .Therefore,porphyry molybdenum belonging to metallogenic belts in the Lesser Xing’an Range-Zhangguangcai Mountain is formed in Early Yanshan Period.According to comprehensive research,it is believed that the formation of porphyry molybdenum belonging to metallogenic belts in the Lesser Xing’an Range-Zhangguangcai Mountain is probably related to collision of the Jiamusi and Songnen massifs,and the subduction of Paleo-Pacific in the Jurassic.

关 键 词：小兴安岭-张广才岭 斑岩型钼矿 地球化学 锆石U-PB年龄 

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