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雷州半岛中西部第四纪火山岩的40Ar/39Ar年龄及地质意义

李响 张宗言 李海勇 张楗钰 白秀娟

李响,张宗言,李海勇,等,2023. 雷州半岛中西部第四纪火山岩的40Ar/39Ar年龄及地质意义[J]. 地质力学学报,29(4):512−521 doi: 10.12090/j.issn.1006-6616.2023098
引用本文: 李响,张宗言,李海勇,等,2023. 雷州半岛中西部第四纪火山岩的40Ar/39Ar年龄及地质意义[J]. 地质力学学报,29(4):512−521 doi: 10.12090/j.issn.1006-6616.2023098
LI X,ZHANG Z Y,LI H Y,et al.,2023. 40Ar/39Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance[J]. Journal of Geomechanics,29(4):512−521 doi: 10.12090/j.issn.1006-6616.2023098
Citation: LI X,ZHANG Z Y,LI H Y,et al.,2023. 40Ar/39Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance[J]. Journal of Geomechanics,29(4):512−521 doi: 10.12090/j.issn.1006-6616.2023098

雷州半岛中西部第四纪火山岩的40Ar/39Ar年龄及地质意义

doi: 10.12090/j.issn.1006-6616.2023098
基金项目: 中国地质调查局地质调查项目(DD20230204,DD20221634,DD20160035);珠海市城市地质调查(含信息化)项目(MZCD-2201-008);广东省基础与应用基础研究基金(2019A1515011244);广州市基础与应用基础研究基金(202201010720);国家自然科学基金项目(91958212)
详细信息
    作者简介:

    李响(1983—),男,博士,正高级工程师,主要从事成因矿物学和第四纪地质研究。E-mail:lixiang_503@163.com

    通讯作者:

    李海勇(1982—),男,博士,副研究员,主要从事研究方向为海洋地球化学研究。E-mail:hyli@scsio.ac.cn

  • 中图分类号: P597;P534

40Ar/39Ar ages of Quaternary volcanic rocks from the midwest of the Leizhou Peninsula, and their geologic significance

Funds: This research is financially supported by the Geological Survey Project of the China Geological Survey (Grants DD20230204, DD20221634, and DD20160035), the Zhuhai Urban Geological Survey (including information) Project (Grant MZCD-2201-008), the Guangdong Basic and Applied Basic Research Foundation (Grant 2019A1515011244), the Guangzhou Basic and Applied Basic Research Fund (Grant 202201010720), and the National Natural Science Foundation of China (Grant No. 91958212).
  • 摘要:

    雷州半岛地区第四纪火山岩广泛分布,但对火山岩形成的时代还存在争议。文章利用高精度的激光阶段加热40Ar/39Ar法对雷州半岛中西部火山岩的年龄进行了测定,并结合与相邻地层的接触关系,划分了2个火山活动旋回。第Ⅰ旋回火山岩呈夹层产于湛江组内部,仅见于钻孔ZKC12中,岩性为橄榄拉斑玄武岩;第Ⅱ旋回火山岩在区内分布最广,覆盖在湛江组之上,40Ar/39Ar年龄为2.02~0.88 Ma,时代为早更新世早期至早更新世晚期,结合与周围地层的接触关系,进一步划分为4个喷发期。第1喷发期(Ⅱ1)规模最大,出露面积最广,形成2个喷发中心,40Ar/39Ar年龄为2.02±0.03 Ma;第2喷发期(Ⅱ2)主要分布于锅盖岭和北插一带,40Ar/39Ar年龄分别为1.77±0.03 Ma、1.70±0.03 Ma;第3喷发期(Ⅱ3)喷发中心位于火炬农场,40Ar/39Ar年龄为1.51±0.07 Ma;第4喷发期(Ⅱ4)岩性以沿裂隙喷发形成的溢流相的玄武质熔岩为主, 40Ar/39Ar年龄为0.88±0.14 Ma。火山活动明显受北东向和北西向基底断裂的控制。研究成果为雷州半岛地区火山活动时代、期次和活动规律研究提供了重要年龄证据。

     

  • 图  1  雷州半岛中西部火山岩分期分布图

    a—雷州半岛第四纪地质简图;b—研究区火山岩分期分布图

    Figure  1.  Distribution of volcanic rocks in the midwest of the Leizhou Peninsula

    (a) Quaternary geological sketch map of the Leizhou Peninsula; (b) Staged distribution of volcanic rocks in the study area

    图  2  代表性钻孔及40Ar/39Ar年龄样采样层位

    Figure  2.  Representative drill cores and 40Ar/39Ar age sampling horizons in the study area

    图  3  雷州半岛中西部火山岩40Ar/39Ar年龄谱和反等时线

    Figure  3.  Age spectra (left) and inverse isochrons (right) of volcanic rock samples from the midwest of the Leizhou Peninsula by 40Ar/39Ar laser stepwise heating

    图  4  雷州半岛中西部火山岩野外地质特征

    a—石峁岭组火山岩呈喷发不整合覆盖在湛江组之上;b—草罗岭采石场火山岩中的喷发韵律,红土夹层代表喷发间断;c—玄武岩球形风化;d—玄武岩中的绳状构造

    Figure  4.  Field geological characteristics of volcanic rocks in the midwest of the Leizhou Peninsula

    (a) Volcanic rocks of the Shimaoling formation unconformably overlying the the Zhanjiang formation; (b) eruptive rhythmites in the volcanic rocks of Caoluoling Quarry, with red clay interlayers representing eruptive discontinuities; (c) Spherical weathering of basalt; (d) Ropy structure in basalt

    表  1  雷州半岛中西部火山活动旋回划分表

    Table  1.   Division of volcanic eruption cycles in the midwest of the Leizhou Peninsula

    地质年代旋回喷发期产出层位累计厚度/m出露面
    积/km2
    主要岩性火山岩相同位素
    年龄/Ma
    第四纪 更新世 4 石峁岭组 >4 .0m 4.1 橄榄拉斑玄武岩 溢流相    0.88
    3 >200.0 m 10.8 石英拉斑玄武岩 溢流相    1.51
    2 >101.4 m 34.3 石英拉斑玄武岩、
    火山碎屑岩
    溢流相爆发相 1.70~1.77
    1 >33.5 m 126.1 石英拉斑玄武岩、
    火山碎屑岩
    溢流相爆发相 2.02
    湛江组 >7.4 m 无出露 橄榄拉斑玄武岩 溢流相   
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-06-14
  • 修回日期:  2023-07-05
  • 录用日期:  2023-07-17

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