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扬马延微陆块构造特征及火山型被动陆缘远端带构造演化模式

姜烨 刘琼 张英德

姜烨, 刘琼, 张英德. 扬马延微陆块构造特征及火山型被动陆缘远端带构造演化模式[J]. 地质科技通报, 2021, 40(5): 112-122. doi: 10.19509/j.cnki.dzkq.2021.0031
引用本文: 姜烨, 刘琼, 张英德. 扬马延微陆块构造特征及火山型被动陆缘远端带构造演化模式[J]. 地质科技通报, 2021, 40(5): 112-122. doi: 10.19509/j.cnki.dzkq.2021.0031
Jiang Ye, Liu Qiong, Zhang Yingde. Structural characteristics of Jan Mayen microcontinent and tectonic evolution model of volcanic passive margin in distal domain[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 112-122. doi: 10.19509/j.cnki.dzkq.2021.0031
Citation: Jiang Ye, Liu Qiong, Zhang Yingde. Structural characteristics of Jan Mayen microcontinent and tectonic evolution model of volcanic passive margin in distal domain[J]. Bulletin of Geological Science and Technology, 2021, 40(5): 112-122. doi: 10.19509/j.cnki.dzkq.2021.0031

扬马延微陆块构造特征及火山型被动陆缘远端带构造演化模式

doi: 10.19509/j.cnki.dzkq.2021.0031
详细信息
    作者简介:

    姜烨(1973-), 女, 高级工程师, 主要从事海外油气勘探研究工作。E-mail: jiangye@cnooc.com.cn

  • 中图分类号: P542

Structural characteristics of Jan Mayen microcontinent and tectonic evolution model of volcanic passive margin in distal domain

  • 摘要: 随着全球油气勘探的不断深入,北大西洋极地逐渐成为油气勘探研究的前沿领域,而扬马延矿区勘探程度极低。基于中海油冰岛矿区新采集的地震及重磁资料,结合其他有关扬马延微陆块最新的研究资料,开展了扬马延微陆块的地层和构造特征分析,以及与共轭盆地的对比,建立了扬马延火山型被动陆缘远端带的构造演化模式。研究表明:位于北大西洋格陵兰与挪威之间海域的扬马延微陆块,与北大西洋两侧陆架盆地古生代-中生代地层具有共轭特征;构造呈NE-SE向展布,发育拆离断裂体系,与挪威西部陆架盆地中生界拆离断裂体系具有相似性;构造内部受岩浆侵入及喷出等强烈影响,发育向海倾斜反射层(SDR)及岩浆溢流相沉积。在上述研究基础上,探讨了扬马延微陆块与格陵兰古陆和波罗的海古陆拉断分离的构造演化过程,认为扬马延在古生代-中生代与格陵兰古陆和波罗的海古陆为一体,在经历了古生代-中生代陆内碰撞、弱伸展到陆内裂谷和陆内热沉降后,受北大西洋拉开影响,经历了古近纪和新近纪火山型被动陆缘远端带的形成演化过程,在55 Ma第一次洋中脊扩张期,与波罗的海古陆挪威陆缘盆地分离,在25 Ma第二次洋脊跃迁时期,新生洋脊扩张导致扬马延微陆块与格陵兰古陆分离,在沉积与构造上开始与北大西洋火山型被动陆缘盆地产生分异,最终扬马延微陆块成为孤立在洋壳上的一个"弃子"。本次关于扬马延微陆块的研究揭示了火山型被动陆缘远端带在岩浆活动、拆离断裂作用下,减薄-破裂的残余陆壳及内部新生洋壳的构造面貌及板块构造背景下的演化过程。

     

  • 图 1  扬马延微陆块区域位置及研究工区资料数据图(图a引自文献[1],有修改)

    Figure 1.  Location map of the Jan Mayan microcontinent and data map of the study area

    图 2  共轭盆地地层对比柱状图

    Figure 2.  Stratigraphic correlation column of conjugate basins

    图 3  井震标定剖面及地震反射特征

    Figure 3.  Section and seismic reflection characteristics of well seismic calibration

    图 4  冰岛扬马延矿区自由空气重力剩余异常图(a)及冰岛扬马延矿区构造分区图(b)

    Figure 4.  Free air remaining gravity anomaly map (a) and structural division map (b) of Jan Mayan area

    图 5  过扬马延矿区北部Line 2地震剖面

    Figure 5.  Seismic section of Line 2 in the northern part of Jan Mayen area

    图 6  北大西洋大洋中脊构造演化史(引自文献[24], 有修改)

    Figure 6.  Evolution of mid-oceanic ridge in the North Atlantic Ocean

    图 7  火山型被动陆缘构造分区及挪威陆架边缘Vøring盆地典型地震剖面

    Figure 7.  Tectonic division of volcanic margin and typical seismic of the Vøring Basin, Norwey shelf margin

    图 8  火山型被动陆缘远端带构造演化模式

    Figure 8.  Tectonic evolution model of volcanic passive margin in the distal domain

    表  1  扬马延微陆块与共轭盆地地层厚度对比

    Table  1.   Correlation of strata thickness between Jan Mayen microcontient and conjugate basins

    扬马延 Jameson Land盆地 Vøring盆地
    古近系和新近系 岩性 玄武岩、泥岩、砂质泥岩 砂岩、泥岩、火山侵入岩 玄武岩、火山侵入岩、砂岩、泥岩
    厚度/km 1~2 0~3 1~3
    中生界 岩性 灰岩、砂岩(取样)) 灰岩、砂岩、砂质泥岩 灰岩、砂岩、泥岩
    厚度/km 1~2 2~3 1~3
    古生界 岩性 灰岩(取样) 灰岩、砂岩 灰岩、砂岩
    厚度/km 0~3 2~10 1~3
    注:①资料来源于重磁震联合反演及海底取样;②资料来源于IHS盆地库及收集到的地震资料
    下载: 导出CSV

    表  2  挪威陆架Vøring盆地构造分区要素

    Table  2.   Tectonic division elements of the Vøring Basin, Norwey

    结构单元 发育部位 地壳厚度/km 拉伸系数 构造样式 沉积特征
    近端带 靠陆侧物源区 20~30 < 1.2 高角度正断层 裂后期沉积薄
    细颈化带 上陆坡 10~25 1.2~1.3 大型拆离断层 裂后期沉积厚
    远端带 下陆坡 < 10 >3 拆离断层 沉积薄
    边缘高地(洋陆转换带) 靠近洋壳 < 5 $ \gg $ 3 / 大洋核杂岩
    下载: 导出CSV
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