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    末次冰期以来巽他陆架东北部陆坡区正构烷烃分布特征及其古植被意义

    崔子恒 贺娟 贾国东

    崔子恒, 贺娟, 贾国东, 2021. 末次冰期以来巽他陆架东北部陆坡区正构烷烃分布特征及其古植被意义. 地球科学, 46(1): 331-340. doi: 10.3799/dqkx.2019.246
    引用本文: 崔子恒, 贺娟, 贾国东, 2021. 末次冰期以来巽他陆架东北部陆坡区正构烷烃分布特征及其古植被意义. 地球科学, 46(1): 331-340. doi: 10.3799/dqkx.2019.246
    Cui Ziheng, He Juan, Jia Guodong, 2021. Composition Distribution of n-Alkanes in Slope Sediments of the Northeast Sunda Shelf since the Last Glacial Period and Its Palaeo-Vegetation Significance. Earth Science, 46(1): 331-340. doi: 10.3799/dqkx.2019.246
    Citation: Cui Ziheng, He Juan, Jia Guodong, 2021. Composition Distribution of n-Alkanes in Slope Sediments of the Northeast Sunda Shelf since the Last Glacial Period and Its Palaeo-Vegetation Significance. Earth Science, 46(1): 331-340. doi: 10.3799/dqkx.2019.246

    末次冰期以来巽他陆架东北部陆坡区正构烷烃分布特征及其古植被意义

    doi: 10.3799/dqkx.2019.246
    基金项目: 

    国家重点研发计划“末次冰消期以来碳氮硫循环与全球变化的关系”项目 2016YFA0601104

    详细信息
      作者简介:

      崔子恒(1995-), 男, 硕士研究生, 从事有机地球化学方向研究.ORCID:0000-0002-1396-0399.E-mail:cuizh@tongji.edu.cn

      通讯作者:

      贾国东, ORCID:0000-0002-8360-0460.E-mail:jiagd@tongji.edu.cn

    • 中图分类号: P736.1

    Composition Distribution of n-Alkanes in Slope Sediments of the Northeast Sunda Shelf since the Last Glacial Period and Its Palaeo-Vegetation Significance

    • 摘要: 为了讨论末次冰期以来巽他陆架东北部植被情况及巽他陆架在冰期时的碳循环意义.对位于南海西南部陆坡的18252-3站位岩心柱沉积物中长链正构烷烃组分的平均链长(ACL27-33)、碳优势指数(CPI27-33)、烷烃含量(∑oddC27-C33)、及烷烃比值等指标进行了分析.结果显示:末次冰期以来CPI27-33表现出与海平面变化具有很好的相关性.冰期时,CPI27-33值表现出明显的奇偶优势,指示了叶蜡烷烃新鲜程度很高,应该主要来自附近出露陆架区的近源供应.冰期低海平面时∑oddC27-C33(ng/g)总体高于全新世,也与陆源供应靠近陆坡区有关.ACL27-33自40 ka B.P.以来呈上升趋势,指示草本植被发育增多和/或气候略为变干.从烷烃记录来看,冰期陆架出露时,n-C29n-C31烷烃相对含量相差不大且均远高于n-C33,至全新世n-C29显著降低,而n-C33则显著增高.结合ACL27-33及烷烃比值数据,可以大致推测冰期出露的研究站位附近陆架地区很可能以热带雨林分布为主.将本文数据与巽他陆架东南部陆坡区数据进行综合分析,推测面向南海的巽他陆架东部地区在冰期时呈现热带雨林景观的可能性很大.由于雨林植被具有巨大的碳蓄积量,因此巽他陆架在冰期时很可能会是一个巨大的陆地碳储库.

       

    • 图  1  18252⁃3岩心及文中提及的相关岩心站位位置

      Fig.  1.  Core 18252⁃3 and the relevant core stations mentioned

      ●. 18252⁃3(Kienast et al., 2001);■. MD972151(Zhao et al., 2006);▲. NS07⁃25(Luo et al., 2019);▲. 17962(Sun et al., 2002);▲. 17964(Sun et al., 2000);▲. 18323(Wang et al., 2009);▲. 18300(Wang et al., 2009);▲. 18302(Wang et al., 2009)

      图  4  18252⁃3岩心沉积物中正构烷烃分布特征

      a. 18252⁃3 U37k’⁃SST(深色线. Kienast et al.(2001)结果;浅色线.本文实验结果);b. CPI27⁃33与海平面变化(改绘自Hanebuth et al. (2011));c. ∑oddC27⁃C33(ng/g)与海平面变化(改绘自Hanebuth et al. (2011));d. n⁃C29/n⁃C31;e. n⁃C29/n⁃C33;f. n⁃C29/n⁃C27;g. ACL27⁃33;虚线: MIS1、MIS2及MIS3时期的分割线;阴影部分:YD(Youngest Dryas).新仙女木事件; OD(Oldest Dryas).老仙女木事件)

      Fig.  4.  Distribution characteristics of alkanes in core 18252⁃3

      图  2  (a) 用于确定年龄控制点的18252⁃3岩心与MD972151岩心的TIC曲线对比; (b)用于确定年龄控制点的18252⁃3岩心与MD972151岩心U37k’温度曲线对比; (c)年龄确定后18252⁃3岩心与MD972151岩心的TIC曲线对比;(d)年龄确定后18252⁃3岩心与MD972151岩心的U37k’温度曲线对比

      MD972151岩心数据来源于Zhao et al.(2006)的实验结果;YD(Youngest Dryas).新仙女木事件;BA(Bolling⁃Allerod).暖事件;OD(Oldest Dryas).老仙女木事件

      Fig.  2.  (a) Age determination of core 18252⁃3 in accordance with TIC data of core MD972151; (b)Age determination of core 18252⁃3 in accordance with U37k'⁃SST data of core MD972151; (c) Comparison of TIC contents versus time for core 18252⁃3 and MD972151; (d) Comparison of U37k' SST versus time for core 18252⁃3 and MD972151

      图  3  18252⁃3岩心n⁃C27n⁃C29n⁃C31n⁃C33烷烃相对含量

      虚线: MIS1、MIS2及MIS3时期的分割线;阴影部分: YD(Youngest Dryas).新仙女木事件、OD(Oldest Dryas).老仙女木事件

      Fig.  3.  Relative content of n⁃C27n⁃C29n⁃C31n⁃C33 of core 18252⁃3

      图  5  ACL27⁃33与CPI27⁃33关系

      Fig.  5.  Relationship between ACL27⁃33 and CPI27⁃33

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