内蒙古北山地区小红山钒钛磁铁矿区双峰式侵入岩——岩石学、年代学、地球化学特征及其地质意义

doi:10.13686/j.cnki.dzyzy.2022.05.005

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摘要对内蒙古北山地区小红山钒钛磁铁矿区内侵入岩的岩石学、锆石U-Pb年代学和全岩地球化学资研究显示，该岩体岩性为辉长岩和花岗岩，LA-ICP-MS锆石U-Pb测年结果表明成岩年龄分别为431.1±2.4 Ma和424.9±2.3 Ma，形成时代相近，属同一构造岩浆作用事件. 该套侵入岩的SiO₂含量呈双峰式，稀土、微量元素特征表明它们具有岛弧岩浆岩地球化学特征，其源区可能受到了俯冲流体交代作用的影响. 地球化学特征指示小红山花岗岩源于下地壳物质在高温条件下的部分熔融，辉长岩为富集地幔部分熔融的产物. 结合区域地质背景及构造判别，认为小红山中晚志留世双峰式岩浆组合是北山洋南向俯冲诱导大陆边缘伸展环境下的产物.

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关键词 ：北山造山带, 钒钛磁铁矿, 双峰式侵入岩, 锆石U-Pb年代学, 活动大陆边缘, 内蒙古

Abstract：Study on the petrology, zircon U-Pb chronology and whole-rock geochemistry of intrusive rocks in Xiaohongshan vanadium-titanium magnetite orefield of Beishan area in Inner Mongolia shows that the lithology of the intrusion is gabbro and granite with the diagenetic age of 431.1±2.4 Ma and 424.9±2.3 Ma respectively. The two types of rocks were formed at a similar time of the same tectono-magmatism event. The SiO₂ content in the intrusive rocks shows double peaks, and the characteristics of rare earth and trace elements indicate that they have the geochemical features of island-arc magmatic rocks, with the source area metasomatized by subduction-related fluid. The geochemical characteristics reflect Xiaohongshan granite is originated from the partial melting of lower crust materials at high temperature while the gabbros resulted from the partial melting of enriched mantle. Combined with the regional geological background and tectonic discrimination, it is concluded that the Middle and Late Silurian bimodal magmatic assemblage in Xiaohongshan area is the product of continental margin extension induced by the southward subduction of Beishan ocean.

Key words： Beishan orogenic belt vanadium-titanium magnetite bimodal intrusive rock zircon U-Pb chronology active continental margin Inner Mongolia

收稿日期: 2021-09-03

PACS:	P588.1
	P597

基金资助:中国地质调查局项目“内蒙古1∶5万基东、尖山、蒜井子、三道明水等四幅区域地质矿产调查”（编号12120113056500）

通讯作者: 李强（1986—），男，硕士，从事地质工程研究工作，通信地址河北省廊坊市曙光道32号，E-mail//1032564223@qq.com E-mail: 1032564223@qq.com

作者简介: 潘志龙（1983—），男，高级工程师，从事地质及矿产勘查工作，通信地址河北省廊坊市曙光道32号，E-mail//15304570@qq.com

引用本文:

潘志龙, 李强, 程学芹, 王硕. 内蒙古北山地区小红山钒钛磁铁矿区双峰式侵入岩——岩石学、年代学、地球化学特征及其地质意义[J]. 地质与资源, 2022, 31(5): 614-624.
PAN Zhi-long, LI Qiang, CHENG Xue-qin, WANG Shuo. BIMODAL INTRUSIVE ROCKS IN XIAOHONGSHAN VANADIUM-TITANIUM MAGNETITE OREFIELD IN BEISHAN AREA OF INNER MONGOLIA: Petrology, Geochronology, Geochemistry and Geological Implication. GEOLOGY AND RESOURCES, 2022, 31(5): 614-624.

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