| 大兴安岭北段高地林场满克头鄂博组火山岩年代学、地球化学特征及其构造意义 |
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| 引用本文： | 于喜洹,李新鹏,李中会,陈旭峰,尹国良,李成禄,王恩宝.大兴安岭北段高地林场满克头鄂博组火山岩年代学、地球化学特征及其构造意义[J].世界地质,2022(1):15-25. |
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| 作者姓名： | 于喜洹 李新鹏 李中会 陈旭峰 尹国良 李成禄 王恩宝 |
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| 作者单位： | 黑龙江省自然资源调查院;黑龙江省地球物理地球化学勘查院 |
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| 基金项目： | 黑龙江地质勘查公益项目(GY-2018001)。 |
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| 摘 要： | 对大兴安岭北段高地林场地区满克头鄂博组火山岩进行LA-ICP-MS锆石U-Pb定年和岩石地球化学研究,以限定其岩石成因及成岩构造背景.定年结果显示:火山岩年龄为(149±1)Ma,形成于晚侏罗世.岩石地球化学特征具有高硅、富碱、贫钙、贫镁,为高钾钙碱性弱过铝质岩石;稀土总量(ΣREE)为124.32×10-6～189....
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| 关 键 词： | 满克头鄂博组 火山岩 地球化学 锆石U-Pb定年 大兴安岭北段 |
Geochronology and geochemical characteristics of volcanic rocks of Manketou ebo Formation in Gaodi forest farm,northern Great Xing an Range,and their tectonic implications |
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| YU Xihuan,LI Xinpeng,LI Zhonghui,CHEN Xufeng,YIN Guoliang,LI Chenglu,WANG Enbao.Geochronology and geochemical characteristics of volcanic rocks of Manketou ebo Formation in Gaodi forest farm,northern Great Xing an Range,and their tectonic implications[J].World Geology,2022(1):15-25. |
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| Authors: | YU Xihuan LI Xinpeng LI Zhonghui CHEN Xufeng YIN Guoliang LI Chenglu WANG Enbao |
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| Institution: | (Natural Resources Survey Institute of Heilongjiang Province,Harbin 150036,China;Heilongjiang Institute of Geophysical and Geochemical Exploration,Harbin 150036,China) |
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| Abstract: | LA-ICP-MS zircon U-Pb dating and whole-rock geochemistry were conducted for the volcanic rocks of Manketou ebo Formation in the Gaodi forest farm area,northern Great Xing an Range,with the aims of constraining their petrogenesis and tectonic setting.The dating results show that the eruptive age of the volcanic rock is(149±1)Ma,i.e.Late Jurassic.In terms of geochemical characteristics,the studied samples are characterized by high silicon,rich alkali,poor calcium,and poor magnesium,belonging to high potassium calc-alkaline weak peraluminous rocks.They have total rare earth element(ΣREE)contents of 124.32×10-6~189.41×10-6and LREE/HREE ratios of 8.72~16.35,indicating a significant fractionation between LREE and HREE.Their magmas originated from the partial melting of shallow crustal materials.Combined with regional geological background,the authors propose that the volcanic rocks of the Manketou ebo Formation were formed in the post-orogenic extensional setting after the closure of Mongolia--Okhotsk Ocean. |
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| Keywords: | Manketou ebo Formation volcanic rocks geochemistry zircon U-Pb dating northern Great Xing an Range |
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