腕足化石古温度研究

程红光; 李心清; 袁洪林; 王兵; 程建中

doi:10.3799/dqkx.2011.069

腕足化石古温度研究

doi: 10.3799/dqkx.2011.069

程红光^{1, 2,},
李心清¹,
袁洪林²,
王兵^{1, 3},
程建中^{1, 3}

1.
中国科学院地球化学研究所环境地球化学国家重点实验室，贵州贵阳 550002
2.
西北大学大陆动力学国家重点实验室，陕西西安 710069
3.
中国科学院研究生院，北京 100049

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
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出版历程
- 收稿日期: 2010-11-28
- 刊出日期: 2011-07-01

The Paleotemperature Study in Brachiopod Shells

1.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.
State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
3.
Graduate School, Chinese Academy of Sciences, Beijing 100049, China

摘要

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.
- 海洋生物 /
- 古温度 /
- 气候变化 /
- 氧同位素 /
- 地球化学
Abstract: The study of temperature changes is the key to the understanding of the variations of earth climate system. A systematic study on the global climatic evolution and its driving mechanism facilitates the understanding of temperature variations. Because of the preservation ability and the distribution of brachiopod shells in Paleozoic, it has been regarded as a common method to distill the oxygen isotopic information from brachiopod shells assigned as preserved well to reconstruct temperature changes in ancient seawater. But there were few reports utilizing their Mg/Ca (mmol/mol) ratios to research variations of temparature in ancient seawater. In this study, brachiopod shells collected from Longmen Mountain in Sichuan Province were analyzed for δ¹⁸O and trace elements Mn, Fe, Mg, Sr and Ca. With optical observation, cathodoluminescence and trace elements concentration, brachiopod shells were assigned to be preserved well and those data of oxygen isotope and trace elements were valid. Compared with the temperatures calculated with oxygen isotope thermometer, the temperatures of the Mg/Ca ratio thermometer are more similar with the ones indicated by biological and paleogeographical evidences. It is possibly due to the unknown oxygen isotope in ancient seawater and its instability. Though the Mg/Ca ratios were also affected by the salinity and pH of ancient seawater, the temperatures according to Mg/Ca ratio thermometer in brachiopod shells were similar with those in reality.
- marine biology /
- paleotemperature /
- climate change /
- oxygen isotope /
- geochemistry

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图 1 研究区域的地理位置

Fig. 1. The sketch map showing sampling area

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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)

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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

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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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