内蒙古固阳绿岩带高腰海BIF型铁矿锆石LA-ICP-MS年代学、地球化学特征及地质意义

doi:10.13278/j.cnki.jjuese.20180290

摘要/Abstract

摘要： 内蒙古高腰海BIF（条带状建造）型铁矿位于华北克拉通西部陆块北缘，产于固阳绿岩带。矿体赋存于新太古代-古元古代色尔腾山群毛忽洞组斜长角闪岩中。铁矿石发育针柱状-粒状变晶结构，具条带状构造。矿物成分以磁铁矿、石英、角闪石为主。对选自赋矿围岩——斜长角闪岩中的热液锆石进行LA-ICP-MS U-Pb定年，得出了（1 933±12）Ma的加权平均年龄，其代表高腰海BIF富矿热事件。原岩恢复显示斜长角闪岩为正变质岩，Zr/Ti-Nb/Y图解显示其为亚碱性玄武岩系列。元素地球化学特征显示原岩可能为T-MORB（过渡型洋脊玄武岩）。结合T-MORB形成的构造环境及区域上BIF成矿规律，初步认为高腰海铁矿形成于岛弧叠加地幔柱的构造环境。

关键词: 高腰海BIF型铁矿, 锆石U-Pb年龄, 固阳绿岩带, 色尔腾山群

Abstract: The Gaoyaohai BIF-type iron deposit in Inner Mongolia is located in the northern margin of Western Block of North China Craton,and occurs in the Guyang greenstone belt. The iron deposit is hosted in amphibolites of the Neoarchean-Paleoproterozoic Maohudong Formation Se'ertengshan Group. The iron ores develop needle-columnar granular structure with banded structure. The mineral compositions are mainly magnetite, quartz,and hornblende. The zircon LA-ICP-MS U-Pb dating from the host rock,amphibolite,shows that the weighted average age of (1 933±12) Ma represents the Gaoyaohai BIF ore-rich thermal event. Through protolith restoration,the amphibolites are metamorphic rock, which originated from sub-alkaline basalt series based on the Zr/Ti-Nb/Y diagrams. The geochemical characteristics of the amphibolites indicate that the original rock may be T-MORB. Combined with the tectonic background of T-MORB formation and the regional BIF metallogenic regularity, it is considered that the Gaoyaohai iron deposit formed in the tectonic environment of island arc superimposed mantle plume.

Key words: Gaoyaohai BIF-type iron deposit, zircon U-Pb age, Guyang greenstone belt, Se'ertengshan Group

中图分类号:

P611

李光耀, 李志丹, 王佳营, 文思博. 内蒙古固阳绿岩带高腰海BIF型铁矿锆石LA-ICP-MS年代学、地球化学特征及地质意义[J]. 吉林大学学报(地球科学版), 2019, 49(5): 1317-1326.

Li Guangyao, Li Zhidan, Wang Jiaying, Wen Sibo. Zircons LA-ICP-MS Chronology, Geochemical Signatures and Geological Significance of Gaoyaohai BIF-Type Iron Deposit in Guyang Greenstone Belt, Inner Mongolia[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1317-1326.

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