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中沙群岛近海表层沉积物中的火山灰及其对构造环境的响应

鄢全树 石学法 刘季花 陈代庚

鄢全树, 石学法, 刘季花, 陈代庚. 中沙群岛近海表层沉积物中的火山灰及其对构造环境的响应[J]. 海洋地质与第四纪地质, 2007, 27(4): 9-16.
引用本文: 鄢全树, 石学法, 刘季花, 陈代庚. 中沙群岛近海表层沉积物中的火山灰及其对构造环境的响应[J]. 海洋地质与第四纪地质, 2007, 27(4): 9-16.
YAN Quan-shu, SHI Xue-fa, LIU Ji-hua, CHEN Dai-geng. CHARACTERISTICS OF VOLCANIC ASH IN SURFACE SEDIMENTS AROUND ZHONGSHA ISLANDS: RESPONSE TO TECTONIC SETTING IN THE NORTH MARGIN OF THE SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2007, 27(4): 9-16.
Citation: YAN Quan-shu, SHI Xue-fa, LIU Ji-hua, CHEN Dai-geng. CHARACTERISTICS OF VOLCANIC ASH IN SURFACE SEDIMENTS AROUND ZHONGSHA ISLANDS: RESPONSE TO TECTONIC SETTING IN THE NORTH MARGIN OF THE SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2007, 27(4): 9-16.

中沙群岛近海表层沉积物中的火山灰及其对构造环境的响应

详细信息
    作者简介:

    鄢全树(1976-),男,博士生,从事海洋地质学和岩石学研究,E-mail:yanquanshu@163.com

  • 基金项目:

    科技基础性工作和社会公益研究专项项目(2003DIB3J114)和青岛市科技将才专项计划项目(05-2-JC-79)

  • 中图分类号: P736.4

CHARACTERISTICS OF VOLCANIC ASH IN SURFACE SEDIMENTS AROUND ZHONGSHA ISLANDS: RESPONSE TO TECTONIC SETTING IN THE NORTH MARGIN OF THE SOUTH CHINA SEA

More Information
  • 摘要: 南海中沙近海表层沉积物的轻组分(粒径为63~125 μm)中主要包括有褐色火山玻璃、无色火山玻璃以及火山渣等3种火山灰类型。在硅碱图(TAS)及Al2O3、FeO*、MgO、CaO、Na2O、K2O对SiO2的变化趋势图中可以判断,本区可能存在双峰式火山活动,褐色火山玻璃代表中-基性端元,而无色火山玻璃代表酸性端元。无色火山玻璃与褐色火山玻璃具有共同的岩浆源区,结晶分异可能是源区岩浆演化的主要方式。这种双峰式火山活动暗示火山活动源区处于大陆拉张减薄环境,支持西沙海槽是一个正在活化的伸展大地构造现象这一观点,同时肯定基于地球物理学和岩石学研究资料所提出的海南地幔柱的存在。
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中沙群岛近海表层沉积物中的火山灰及其对构造环境的响应

    作者简介:

    鄢全树(1976-),男,博士生,从事海洋地质学和岩石学研究,E-mail:yanquanshu@163.com

基金项目:

科技基础性工作和社会公益研究专项项目(2003DIB3J114)和青岛市科技将才专项计划项目(05-2-JC-79)

  • 中图分类号: P736.4

摘要: 南海中沙近海表层沉积物的轻组分(粒径为63~125 μm)中主要包括有褐色火山玻璃、无色火山玻璃以及火山渣等3种火山灰类型。在硅碱图(TAS)及Al2O3、FeO*、MgO、CaO、Na2O、K2O对SiO2的变化趋势图中可以判断,本区可能存在双峰式火山活动,褐色火山玻璃代表中-基性端元,而无色火山玻璃代表酸性端元。无色火山玻璃与褐色火山玻璃具有共同的岩浆源区,结晶分异可能是源区岩浆演化的主要方式。这种双峰式火山活动暗示火山活动源区处于大陆拉张减薄环境,支持西沙海槽是一个正在活化的伸展大地构造现象这一观点,同时肯定基于地球物理学和岩石学研究资料所提出的海南地幔柱的存在。

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