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    广东三水盆地始新世火山岩地球化学特征

    张维 方念乔

    张维, 方念乔, 2014. 广东三水盆地始新世火山岩地球化学特征. 地球科学, 39(1): 37-44. doi: 10.3799/dqkx.2014.004
    引用本文: 张维, 方念乔, 2014. 广东三水盆地始新世火山岩地球化学特征. 地球科学, 39(1): 37-44. doi: 10.3799/dqkx.2014.004
    Zhang Wei, Fang Nianqiao, 2014. Geochemistry Characteristics of Eocene Volcanic Rocks in Sanshui Basin, Guangdong. Earth Science, 39(1): 37-44. doi: 10.3799/dqkx.2014.004
    Citation: Zhang Wei, Fang Nianqiao, 2014. Geochemistry Characteristics of Eocene Volcanic Rocks in Sanshui Basin, Guangdong. Earth Science, 39(1): 37-44. doi: 10.3799/dqkx.2014.004

    广东三水盆地始新世火山岩地球化学特征

    doi: 10.3799/dqkx.2014.004
    基金项目: 

    国家自然科学基金 41030853

    国家重点基础研究发展计划"973"项目 2007CB411703

    详细信息
      作者简介:

      张维(1983-), 男, 博士研究生, 研究方向为海洋地质学和岩石地球化学.E-mail: vincent_zhangw@163.com

      通讯作者:

      方念乔, E-mail: fangnq@yahoo.com.cn

    • 中图分类号: P595

    Geochemistry Characteristics of Eocene Volcanic Rocks in Sanshui Basin, Guangdong

    • 摘要: 广东三水盆地的演化伴随着强烈的火山活动.为研究三水盆地各类岩石之间的演化关系, 对在盆地内的玄武岩、粗面岩和流纹岩样品进行常量、微量元素地球化学分析.对样品的地球化学投图表明: 玄武岩样品表现为轻稀土富集的板内玄武岩稀土配分模式, 而其微量元素也具有Nb、Ti富集、Sr弱亏损的特征, 由部分熔融产生;粗面岩与流纹岩样品稀土与微量元素配分模式相似, 两类岩石均经历以斜长石为主的分离结晶过程.华南陆缘在始新世早期处于与红海相似的大陆裂谷环境, 喷发来源于深部软流圈地幔的岩浆, 但在42 Ma之后, 火山活动因区域挤压作用而停止.其后的南海扩张可能是两种作用的叠加影响的结果.

       

    • 图  1  三水盆地采样点分布

      Fig.  1.  Sampling locations in Sanshui basin

      图  2  三水盆地火山岩与地层(参考李大明等, 1989张显球等, 1993董月霞等, 2006)

      Fig.  2.  Volcanic rocks and stratigraphy of Sanshui basin

      图  3  WJG玄武岩橄榄石斑晶(a)和ZD玄武岩(b)镜下照片(单偏光)

      Fig.  3.  Photos of WJG basalt (a) and ZD basalt (b) under microscope

      图  4  ZMY粗面岩(a)和LBS流纹岩(b)镜下照片(单偏光)

      Fig.  4.  Photos of ZMY trachyte (a) and LBS rhyolite (b) under microscope

      图  5  火山岩样品TAS图解

      Fig.  5.  TAS diagram for volcanic rock samples

      图  6  三水盆地玄武岩稀土元素配分曲线(a)与微量元素配分模式图(b)(标准化数据来源于Sun and McDonough, 1989)

      Fig.  6.  REE distribution and trace elements spidergram for basalts in Sanshui basin

      图  7  三水盆地粗面岩稀土元素配分曲线(a)与微量元素配分模式图(b)(标准化数据来源于Sun and McDonough, 1989)

      Fig.  7.  REE distribution and trace elements spidergram for trachytes in Sanshui basin

      图  8  三水盆地流纹岩稀土元素配分曲线(a)与微量元素配分模式图(b)(标准化数据来源于Sun and McDonough, 1989)

      Fig.  8.  REE distribution and trace elements spidergram for rhyolites in Sanshui basin

      图  9  三水盆地火山岩La/Sm vs La比值(a)和2(Fe+Mg)/P vs Si/P(b)图解(虚线表示结晶分离线, 实线表示部分熔融线)

      Fig.  9.  Binary variation diagram of La/Sm vs. La (a) and 2 (Fe+Mg)/P vs. Si/P (b) of volcanic rocks in Sanshui basin

      图  10  三水盆地火山岩La/Yb vs. Nb/La比值(参考Moustafa and Ahmed, 2012;下地壳平均值来源于Chen and Arculus, 1995;区分软流圈地幔和岩石圈地幔的虚线来源于Smith et al., 1999)

      Fig.  10.  Binary variation of La/Yb vs. Nb/La for volcanic rocks in Sanshui basin

      图  11  三水盆地火山岩Sr-Nd同位素比值(数据来源于朱炳权等, 1991;图中数字表示K-Ar测年得出的年龄)

      Fig.  11.  143Nd/144Nd vs. 87Sr/86Sr for volcanic rocks from Sanshui basin

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    • 收稿日期:  2013-09-06
    • 刊出日期:  2014-01-01

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