| 胶莱盆地西南缘青山群火山岩锆石U-Pb年龄、岩石地球化学特征及意义 |
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| 引用本文： | 孔祥超,程蓉蓉,孙景耀,卢文姬,鲁浩.胶莱盆地西南缘青山群火山岩锆石U-Pb年龄、岩石地球化学特征及意义[J].地质找矿论丛,2022,37(1):84-95. |
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| 作者姓名： | 孔祥超 程蓉蓉 孙景耀 卢文姬 鲁浩 |
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| 作者单位： | 山东省第三地质矿产勘查院,山东烟台264011,中国冶金地质总局山东正元地质勘查院,济南250013 |
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| 基金项目： | 山东省省级地质勘查项目 |
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| 摘 要： | 胶莱盆地西南缘发育的青山群火山岩以中-中酸性为主,属同源岩浆喷发;岩石具有高硅、高钾、富铝、贫铁钛特征;微量元素Nb、Ta亏损,Zr、Hf较富集,岩浆来源于下地壳,与板块俯冲作用有关;稀土元素配分图具右倾特征,轻稀土富集,Eu异常不明显;岩浆演化特征以部分熔融为主,区内火山岩碱度指数A·R值小于4.0,判断研究区青山群...
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| 关 键 词： | 青山群火山岩 地球化学 锆石U-Pb年龄 构造环境 胶莱盆地 |
| 收稿时间： | 2021/5/28 0:00:00 |
Zircon U-Pb age,geochemical characteristics and the geological significance of volcanic rocks of Cretaceous Qingshan group at the Southwest margin of Jiaolai basin |
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| KONG Xiangchao,CHENG Rongrong,SUN Jingyao,LU Wenji,LU Hao.Zircon U-Pb age,geochemical characteristics and the geological significance of volcanic rocks of Cretaceous Qingshan group at the Southwest margin of Jiaolai basin[J].Contributions to Geology and Mineral Resources Research,2022,37(1):84-95. |
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| Authors: | KONG Xiangchao CHENG Rongrong SUN Jingyao LU Wenji LU Hao |
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| Institution: | No. 3 Exploration Institute of Geology and Mineral Resources, Yantai 264000, Shandong, China;Shandong Zhengyuan Geological Exploration Institute of China Metallurgical Geology Bureau, Jinan 250000, China |
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| Abstract: | Volcanic rocks of Early Cretaceous Qingshan group at Southwest margin of Jiaolai basin are dominated by intermediate-intermediate acidic rocks.The volcanic are the product of cognate eruption characterized by high Si and K,Al richness and Fe and Ti poorness,relative trace element depletion of Nb,Ta and relative enrichment of Zr and Hf,REE pattern declined to right,LEE enrichment,indistinct Eu anomaly.The Magma is partially melted one related to plate subduction and comes from lower crust.Alkalinity index AR of the volcanic is less than 4.0 suggesting a continent marginal tectonic setting.The zircon U-Pb dating is 113 Ma~119 Ma. |
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| Keywords: | volcanic rocks of Qingshan group geochemistry zircon U-Pb age tectonic setting Jiaolai basin |
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