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    腕足化石古温度研究

    程红光 李心清 袁洪林 王兵 程建中

    程红光, 李心清, 袁洪林, 王兵, 程建中, 2011. 腕足化石古温度研究. 地球科学, 36(4): 679-686. doi: 10.3799/dqkx.2011.069
    引用本文: 程红光, 李心清, 袁洪林, 王兵, 程建中, 2011. 腕足化石古温度研究. 地球科学, 36(4): 679-686. doi: 10.3799/dqkx.2011.069
    CHENG Hong-guang, LI Xin-qing, YUAN Hong-lin, WANG Bing, CHENG Jian-zhong, 2011. The Paleotemperature Study in Brachiopod Shells. Earth Science, 36(4): 679-686. doi: 10.3799/dqkx.2011.069
    Citation: CHENG Hong-guang, LI Xin-qing, YUAN Hong-lin, WANG Bing, CHENG Jian-zhong, 2011. The Paleotemperature Study in Brachiopod Shells. Earth Science, 36(4): 679-686. doi: 10.3799/dqkx.2011.069

    腕足化石古温度研究

    doi: 10.3799/dqkx.2011.069
    基金项目: 

    国家自然科学基金项目 41003006

    省科学技术基金 2009GZ49244

    西北大学大陆动力学国家重点实验室开放课题基金 08LCD04

    详细信息
      作者简介:

      程红光(1981-),男,助理研究员,博士,主要从事环境地球化学的研究.E-mail:chenghongguang@mails.gyig.ac.cn

    • 中图分类号: P632

    The Paleotemperature Study in Brachiopod Shells

    • 摘要: 温度变化研究是理解地球气候系统变化的关键环节之一.通过对海水温度变化的了解,可以系统地了解全球气候演化规律及其驱动机制.由于腕足化石具有保存完好以及分布年限长等优势,提取腕足化石中氧同位素信息进行古生代海水温度变化研究,已成为常用手段,但利用其Mg/Ca比值进行古温度变化的探讨却很少报道.通过对四川龙门山泥盆纪腕足化石中氧同位素以及Fe、Mn、Sr、Mg、Ca等微量元素的提取,结合微体结构观察、阴极发光等实验,在判定腕足化石保存良好的前提下,发现根据腕足化石中Mg/Ca(mmol/mol,下同)比值计算的温度相比氧同位素推算的温度,同生物学、古地理学证据显示的温度更为接近.此结果可能是由于利用氧同位素计算温度时古海水氧同位素未知及其不稳定性造成的.尽管腕足化石Mg/Ca比值温度计同样受海水的盐度以及pH等因素的影响,但计算结果显示,其反演的古温度比较接近真实的温度变化.

       

    • 图  1  研究区域的地理位置

      Fig.  1.  The sketch map showing sampling area

      图  2  腕足类壳体扫描电镜相片(a, b)及其壳体在正交偏光相片(c)和阴极发光实验相片(d)

      Fig.  2.  The SEM images of brachiopod shells (a, b), the orthogonal polarized photomicrographs of brachiopod shells (c) and cathodoluminescene photomicrographs of non-luminescent of brachiopod shell (d)

      图  3  腕足化石中Sr、Mn含量比值

      国际上目前应用微量元素判定标准:Sr>400 μg/g,Mn<250 μg/g

      Fig.  3.  The ratios of Mn/Sr in brachiopod shells

      图  4  腕足化石氧同位素组成、Mg/Ca比值及其温度计算(其中c, d分别为根据氧同位素和Mg/Ca比值计算的温度)

      Fig.  4.  Oxygen isotope values and Mg/Ca ratios in brachiopod shells, and the calculated temperature

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    • 收稿日期:  2010-11-28
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