内蒙古新巴尔虎右旗特格乌拉地区花岗斑岩年代学及地球化学特征

doi:10.13686/j.cnki.dzyzy.2023.04.001

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摘要对大兴安岭特格乌拉地区花岗斑岩进行岩石学、地球化学、成因及构造环境研究结果显示，花岗斑岩年龄为145.9±1.2 Ma，形成时代为早白垩世晚期.岩石具有富硅、富碱和富铝质的特点，属于准铝质-铝质高钾钙碱性系列.矿物组合及地球化学特征显示特格乌拉地区花岗斑岩为高分异I型花岗岩，富集大离子亲石元素（Rb、Th、U）和轻稀土元素（La、Ce、Pr），负Eu异常明显，显示壳源岩浆或岩浆被地壳物质混染的地球化学特点.特格乌拉地区花岗斑岩形成于造山后伸展环境，这种构造背景可能与蒙古-鄂霍次克缝合带闭合后加厚陆壳的拆沉作用有关.

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	马巧燕
	邵永旭
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	邱广东

关键词 ：花岗斑岩, 锆石U-Pb年龄, 地球化学, 岩石成因, 构造背景, 特格乌拉地区, 内蒙古

Abstract：The study on the petrology, geochemistry, genesis and tectonic environment of the granite porphyry in Tegewula area of Daxinganling Mountains show that the age of the rock is 145.9±1.2 Ma, formed in the late Early Cretaceous. The granite porphyry is rich in silicon, alkali and aluminum, belonging to the quasi aluminous-aluminous high-potassium calc-alkaline series. The mineral assemblage and geochemical characteristics show that the granite porphyry is highly differentiated I-type granite, with enriched LILEs (Rb, Th and U) and LREEs (La, Ce and Pr), and obvious negative Eu anomaly, indicating the geochemical characteristics of crust-derived magma or magma mixed with crustal materials. It is concluded that the granite porphyry in Tegewula area was formed in a post-orogenic extensional environment, which may be related to the delamination of thickened continental crust after the closure of Mongolia-Okhotsk suture zone.

Key words： granite porphyry zircon U-Pb age geochemistry lithogenesis tectonic setting Tegewula area Inner Mongolia

收稿日期: 2022-04-12

PACS:

P597

基金资助:中国地质调查局项目"内蒙古新巴尔虎右旗罕布庙等四幅1：5万地质矿产综合调查"（编号12120115031601）.

作者简介: 马巧燕(1977-),女,高级工程师,主要从事基础地质调查及地质资料管理工作,通信地址内蒙古自治区呼和浩特市金桥开发区世纪五路内蒙古自治区地质调查研究院,E-mail//307013720@qq.com

引用本文:

马巧燕, 邵永旭, 曹磊, 邱广东. 内蒙古新巴尔虎右旗特格乌拉地区花岗斑岩年代学及地球化学特征[J]. 地质与资源, 2023, 32(4): 373-382.
MA Qiao-yan, SHAO Yong-xu, CAO Lei, QIU Guang-dong. GEOCHRONOLOGY AND GEOCHEMISTRY OF THE GRANITE PORPHYRY IN TEGEWULA AREA OF XIN BARAG YOUQI, INNER MONGOLIA. GEOLOGY AND RESOURCES, 2023, 32(4): 373-382.

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