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王飞飞, 韩宗珠, 林学辉, 部雪娇, 来志庆. 闽北大嵛山岛火山岩岩石地球化学及成因研究[J]. 海洋地质前沿, 2020, 36(3): 31-43. doi: 10.16028/j.1009-2722.2019.092
引用本文: 王飞飞, 韩宗珠, 林学辉, 部雪娇, 来志庆. 闽北大嵛山岛火山岩岩石地球化学及成因研究[J]. 海洋地质前沿, 2020, 36(3): 31-43. doi: 10.16028/j.1009-2722.2019.092
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WANG Feifei, HAN Zongzhu, LIN Xuehui, BU Xuejiao, LAI Zhiqing. Geochemistry and Petrogenesis of Late Mesozoic Volcanic Rocks at DayushanIslands of Northern Geochemistry and Petrogenesis of Late Mesozoic Volcanic Rocks at DayushanIslands of Northern Fujian[J]. Marine Geology Frontiers, 2020, 36(3): 31-43. doi: 10.16028/j.1009-2722.2019.092
Citation: WANG Feifei, HAN Zongzhu, LIN Xuehui, BU Xuejiao, LAI Zhiqing. Geochemistry and Petrogenesis of Late Mesozoic Volcanic Rocks at DayushanIslands of Northern Geochemistry and Petrogenesis of Late Mesozoic Volcanic Rocks at DayushanIslands of Northern Fujian[J]. Marine Geology Frontiers, 2020, 36(3): 31-43. doi: 10.16028/j.1009-2722.2019.092
shu

闽北大嵛山岛火山岩岩石地球化学及成因研究

  • 1.

    中国海洋大学海洋地球科学学院，青岛 266100

  • 2.

    海底科学与探测技术教育部重点实验室，青岛 266100

  • 3.

    中国地质调查局青岛海洋地质研究所，青岛 266071

详细信息
    作者简介: 王飞飞(1992—)，女，在读硕士，主要从事岩石地球化学研究工作. E-mail: w18254263520@163.com
    通讯作者: 韩宗珠(1964—)，男，硕士，教授，主要从事岩石学和地球化学研究工作. E-mail: hanzongzhu@ouc.edu.cn

  • 中图分类号: P591;P597.3;P588.1

Geochemistry and Petrogenesis of Late Mesozoic Volcanic Rocks at DayushanIslands of Northern Geochemistry and Petrogenesis of Late Mesozoic Volcanic Rocks at DayushanIslands of Northern Fujian

  • 1.

    College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

  • 2.

    Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China

  • 3.

    Qingdao Institute of Marine Geology, CGS, Qingdao 266071, China

More Information

    摘要

  • 闽北近岸岛屿(大嵛山岛、浮鹰岛及东台山岛)晚中生代火山岩以凝灰岩、流纹岩类为主，偶见中基性安山岩类。大嵛山岛西北部火山岩定年结果为(100.2±1.7) Ma，可对应闽东上火山岩系石帽山群黄坑组，西部及东部火山岩定年结果为(116.7±1.5) Ma和(111.4±2.0) Ma，可对应闽东下火山岩系小溪组。主量元素结果显示该岛屿以酸性(SiO2含量＞65%)火山岩为主，钾含量较高，主要为高钾钙碱性-钾玄岩。稀土元素配分图表现为轻稀土富集的右倾型特征，微量元素蛛网图表现出富集Rb、K、Pb等大离子亲石元素(LILE)，亏损Ta、Nb、Ti等高场强元素(HFS)，Eu负异常，具有明显的壳源特征。两阶段Nd模式年龄(T2DM)为1 401~1 327 Ma，表明岩浆可能主要来源于中元古界陆壳物质。Pb同位素特征显示与富集地幔EMⅡ存在亲缘关系，表明研究区火山岩岩浆可能主要来源于与俯冲作用有关的大陆地壳物质。小溪组和黄坑组火山岩Sr同位素初始比值(87Sr/86Sr)i分别为0.710 13~0.711 10和0.722 82，143Nd/144Nd值分别为0.512 208~0.512 214和0.512 267，ξNd(t)值分别为-6.1~-6.0和-5.2，表明两组火山岩岩浆来源存在差异，可能存在不同程度的幔源物质混合作用。结合区域构造背景认为，研究区晚中生代火山岩的形成与太平洋板块俯冲作用密切相关，具有板内及火山弧特征。

    The Late Mesozoic volcanic rocks on the offshore islands of northern Fujian are dominated by tuff and rhyolite, occasionally with mid-basic igneous rocks. The dating results of zircon suggest that the volcanic rocks in the northwest of the Dayushan Island are (100.2±1.7) Ma in age, corresponding to the upper volcanic rock series of Huangkeng Formation in east Fujian, and the western and eastern volcanic rocks are (116.7±1.5) Ma and (111.4±2.0) Ma respectively, which can be correlated to the Xiaoxi Formation of the lower volcanic series in eastern Fujian. The geochemical characteristics of the major elements show that the volcanic rocks of the area are mostly intermediate-acid (SiO2 > 65%), belonging to high potassium calcium alkaline-potassium rock series. The normalized pattern diagram of REE suggests a right-leaning pattern or light rare earth enrichment, whereas the diagram of trace elements shows the enrichment of LILE such as Rb, K, Pb, loss of HFS such as Ta, Nb, Ti, and the negative anomaly of Eu, with obvious shell source characteristics. T2DM=1 401~1 327 Ma, suggesting that the magma may have originated from the crustal material of the Mesoproterozoic.Pb isotope shows that they are related with EM Ⅱ, which indicates that the volcanic magma in the study area may be mainly originated from the continental crustal material related to subduction.The (87Sr/86Sr) of the Xiaoxi Formation and Huangkeng Formation are 0.710 13~0.711 10 and 0.722 82, 143Nd/144Nd are 0.512 208~0.512 214 and 0.512 267, ξNd(t) are -6.1~-6.0 and -5.2, suggesting that there may be mantle-derived mixing of the two groups. According to the regional tectonic setting, the Late Mesozoic volcanic rocks in the study area were formed in a plate extension environment of an active continental margin, with the characteristics of intraplate and volcanic arc.

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  • 图 1  研究区位置

    Figure 1. 

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    图 2  大嵛山岛火山岩采样点

    Figure 2. 

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    图 3  代表性火山岩手标本

    Figure 3. 

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    图 4  大嵛山岛代表性样品显微镜下特征

    Figure 4. 

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    图 5  大嵛山岛锆石CL图、测试位置(圈出部分)及测试结果

    Figure 5. 

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    图 6  大嵛山岛锆石测年结果

    Figure 6. 

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    图 7  火山岩地球化学分类图解(据文献[21-23]修改)

    Figure 7. 

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    图 8  稀土元素(REE)球粒陨石标准化配分图及微量元素原始地幔化蛛网图(据文献[22, 25]修改)

    Figure 8. 

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    图 9  火山岩εNd(t)-(87Sr/86Sr)i相关图解(引用数据源自文献[26-28])

    Figure 9. 

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    图 10  207Pb/204Pb-206Pb/204Pb相关性图解(据文献[29]修改)

    Figure 10. 

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    图 11  208Pb/204Pb-206Pb/204Pb相关性图解(据文献[30]修改)

    Figure 11. 

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    图 12  岩浆不均一性相关图解(据文献[16]修改)

    Figure 12. 

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    图 13  华南地区板块俯冲模式简图(据文献[34]修改)

    Figure 13. 

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    图 14  构造环境判别图(据文献[35]修改)

    Figure 14. 

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收稿日期:  2019-04-15
刊出日期:  2020-03-28

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