| 大兴安岭北部新林地区早侏罗世火山岩的发现及其地质意义 |
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| 引用本文： | 刘涛,吉峰,王文东,王久懿,赵喜东.大兴安岭北部新林地区早侏罗世火山岩的发现及其地质意义[J].地质与资源,2022,31(1):1-12. |
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| 作者姓名： | 刘涛 吉峰 王文东 王久懿 赵喜东 |
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| 作者单位： | 1. 中国地质调查局 哈尔滨自然资源综合调查中心, 黑龙江 哈尔滨 150086;2. 大庆油田第三采油厂地质研究所, 黑龙江 大庆 163000 |
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| 基金项目： | 二中队幅万区域地质矿产调查(12120113072400);中国地质调查局项目 |
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| 摘 要： | 大兴安岭北部新林地区战备村一带新发现早侏罗世酸性火山岩.共测试2个锆石LA-ICP-MS U-Pb年龄.第一个测年样品为绢英岩化流纹岩,谐和图上测点偏离谐和线右侧为典型的不谐和年龄,与谐和线相交年龄为192.0±1 Ma,MSWD=1.2,为流纹岩喷出后的冷却结晶年龄;第二个测试样品为弱硅化流纹岩,谐和年龄为178.0...
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| 关 键 词： | 早侏罗世 流纹岩 锆石年龄 地球化学 大兴安岭 |
| 收稿时间： | 2021-08-09 |
DISCOVERY OF THE EARLY JURASSIC VOLCANIC ROCKS IN XINLIN AREA OF NORTHERN DAXINGANLING MOUNTAINS:Geological Implication |
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| LIU Tao,JI Feng,WANG Wen-dong,WANG Jiu-yi,ZHAO Xi-dong.DISCOVERY OF THE EARLY JURASSIC VOLCANIC ROCKS IN XINLIN AREA OF NORTHERN DAXINGANLING MOUNTAINS:Geological Implication[J].Geology and Resources,2022,31(1):1-12. |
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| Authors: | LIU Tao JI Feng WANG Wen-dong WANG Jiu-yi ZHAO Xi-dong |
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| Institution: | 1. Harbin Center of Comprehensive Natural Resources Survey, CGS, Harbin 150086, China;2. No.3 Oil Production Plant Geological Institute of Daqing Oilfield Ltd., Co., Daqing 163000, Heilongjiang Province, China |
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| Abstract: | The Early Jurassic acid volcanic rocks are newly discovered in Zhanbeicun Formation of Xinlin area in northern Daxinganling Mountains,from which two samples of zircon LA-ICP-MS U-Pb ages are determined.The first is sericitized rhyolite,with the testing point deviating to the right side of concordant curve on the concordia diagram—a typical discordant age,yielding the intersecting age with concordant curve of 192.0±1 Ma(MSWD=1.2),which is the cooling crystallization age of rhyolites after extrusion.The second one is weakly silicified rhyolite with a concordant age of 178.0±1 Ma,which is the result of the loss of radioactive trace element Pb,and the rock-forming age should be close to that of the sericitized rhyolite.The volcanic rocks are petrochemically and geochemically characterized by high Ti rhyolite and I-type rhyolite.The Mg#value of the rhyolite(0.43-0.73)and content of hypersthene in CIWP norm minerals(0.25%-0.96%)support that the rhyolite is derived from crystallization-differentiation of basic magma. |
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| Keywords: | Early Jurassic rhyolite zircon age geochemistry Daxinganling Mountains |
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