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尼雄地区早白垩世磁铁矿伸展成矿地质背景及成矿模型
投稿时间:2019-11-23  修订日期:2020-01-01  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020163
摘要点击次数: 28
全文下载次数: 43
作者单位E-mail
刘函 中国地质调查局成都地质调查中心 liuhan_cdcgs@163.com 
李俊 中国地质调查局成都地质调查中心  
崔浩杰 成都理工大学地球科学学院  
苟正彬 中国地质调查局成都地质调查中心  
李奋其 中国地质调查局成都地质调查中心  
张士贞 中国地质调查局成都地质调查中心  
段瑶瑶 中国地质调查局成都地质调查中心  
基金项目:国家自然科学基金(41773026)和中国地质调查项目(DD20190053)共同资助
中文摘要:尼雄地区早白垩世磁铁矿以成矿岩体及矿床研究偏多,忽略围岩时代及其成矿地质背景分析。尼 雄早白垩世磁铁矿可分为矽卡岩型和热液脉型,而达及藏布地区热液脉型磁铁矿与基性岩脉密切相关,通过共生 辉长岩岩脉锆石U-Pb年龄(120.1±1.7Ma±)限定热液脉型磁铁矿成矿时代约120Ma,与已经确定成矿时代的矽 卡岩型铁矿成矿时代一致,指示尼雄矿田两种类型磁铁矿受控于相同的地质背景。通过尼雄岩体碎屑岩围岩(原 上二叠统敌布错组)碎屑锆石测年,获得其沉积时代介于130~120Ma之间,故将上二叠统敌布错组重新厘定为下 白垩统则弄群。结合区域地层及岩浆岩新资料,认为冈底斯中部则弄群火山岩与侵位于其中的岩体构成一个早白 垩世火山 侵入杂岩体系,其与尼雄矿田早白垩世磁铁矿密切相关。该早白垩世火山 侵入杂岩地球化学特征及尼 雄附近浅表层次构造共同指示冈底斯中部在早白垩世处于伸展构造背景。最后,依据伸展构造背景新认识建立尼 雄地区早白垩世磁铁矿成矿地质模型。
中文关键词:冈底斯中部,尼雄铁矿,早白垩世,伸展,成矿模型
 
Metallogenic background and metallogenic model of the Early Cretaceous magnetite deposit in the Nixiong area, Tibet
Author NameAffiliationE-mail
LIU HAN ChengduCenter,ChinaGeologicalSurvey liuhan_cdcgs@163.com 
LI JUN ChengduCenter,ChinaGeologicalSurvey  
CUI HAOJIE College of Earth Sciences,Chengdu University of Technology  
GOU ZHENGBIN Chengdu Center,China Geological Survey  
LI FENQI Chengdu Center,China Geological Survey  
ZHANG SHIZHEN Chengdu Center,China Geological Survey  
DUAN YAOYAO Chengdu Center,China Geological Survey  
Abstract:The Nixiong Iron Mine, as a large magnetite deposit in the central Gangdese belt, which mainly formed in the early Cretaceous, and this paper will discuss the metallogenic background of magnetite deposit in this period. The Nixiong Early Cretaceous magnetite deposit can be divided into Skarn type and hydrothermal vein type, and mineralization era of the later was limited to about 120 Ma by the U-Pb age (120.1 ± 1.7 Ma) of gabbro dyke in mining area, that was well consistent with the determined mineralization era of Skarn type magnetite deposit, indicating a similar setting of both type magnetite deposit. The Dibucuo Formation, as the main surrounding rock of the Nixiong rock mass, was renamed to be the Zenong Group by detrital zircon U-Pb dating. Combined with the new data of the strata and magmatic rocks, there had been an Early Cretaceous volcanic-intrusive complexe system in the central Gangdese belt, composed of the volcanic rocks from Zenong Group and rock mass emplaced in Zenong Group, both show the geochemical characteristics of an extension tectonic setting. In addition, The relationship between structure and Magma also showed that the mineralization of Early Cretaceous magnetite deposit took place in an extensional stress environment, which were ubiquity in the central Gangdese belt. Finally, a metallogenic geological model of the Nixiong magnetite deposit was established during the Early Cretaceous.
keywords:central Gangdese, Nixiong Iron Mine, Early Cretaceous, extension, metallogenic  model
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