牙形石生物磷灰石地球化学研究进展

张磊; 赵赫; 吕政艺; 王向东

doi:10.3799/dqkx.2025.004

牙形石生物磷灰石地球化学研究进展

doi: 10.3799/dqkx.2025.004

张磊^1, ,,
赵赫²,
吕政艺¹,
王向东¹

1.
中国地质大学(武汉)地质过程与成矿预测全国重点实验室, 湖北武汉 430078
2.
中国地质大学(武汉)海洋学院, 湖北武汉 430074

基金项目:

国家自然科学基金项目 92055212

国家自然科学基金项目 42073073

国家自然科学基金项目 42477215

国家自然科学基金项目 42372037

国家自然科学基金项目 42472160

中国地质大学（武汉）“地大学者”人才岗位科研启动经费 2023081

国家资助博士后研究人员计划项目 GZC20232474

中国博士后科学基金面上项目 2024M753028

湖北省博士后创新人才培养项目A类 2004HBBHCXA084

中国地质大学（武汉）地质过程与成矿预测全国重点实验室项目 MSFGPMR2024-104

详细信息

作者简介:
张磊（1991—），男，副研究员，主要从事重大地质事件沉积地球化学的研究工作. ORCID：0000‐0002‐6367‐9001. E‐mail：zhanglei_cug@sina.com

中图分类号: P593
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- 被引次数: 0
出版历程
- 收稿日期: 2024-12-02
- 网络出版日期: 2025-03-19
- 刊出日期: 2025-03-25

Progress in Study of Conodont Bioapatite Geochemistry

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430078, China
2.
College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan 430074, China

摘要

摘要: 牙形石作为一类已灭绝的但分类地位不明的海洋脊索动物的口部摄食器官，是一种由碳氟磷灰石组成的磷酸盐质微体化石（大小一般约0.5 mm，最大可达3 mm），对成岩蚀变具有较强的抵抗能力，有利于保存原始海水信息，它的元素和同位素组成被认为是可靠的古海洋化学记录载体.以稀土元素和氧、锶、钙同位素体系为代表的牙形石地球化学研究在揭示古海洋氧化还原状态、古海洋酸碱程度、海水表层温度、大陆风化作用和古气候等方面发挥了关键作用.一直以来，相关学者不仅聚焦于牙形石地球化学研究在古环境‒古气候领域的应用，也不断深入探究牙形石微观结构，尤其是多种元素及同位素信息的准确提取、评价和筛选，目的是进一步完善牙形石地球化学研究方法并准确应用.本文综述了牙形石形貌、结构和古生态特征，在此基础上总结了牙形石稀土元素以及氧、锶、钙同位素地球化学研究进展，以期为牙形石地球化学发展及其在古环境‒古气候研究中的应用提供参考和启发.
- 牙形石 /
- 古海洋 /
- 古温度 /
- 大陆风化 /
- 稀土元素 /
- 氧同位素 /
- 锶同位素 /
- 钙同位素 /
- 地球化学
Abstract: Conodonts, serving as a feeding apparatus in oral cavity of an extinct and taxonomically ambiguous group of marine chordates, are phosphatic microfossils composed of carbonate fluorapatite (typically around 0.5 mm in size, with a maximum of 3 mm). They exhibit strong resistance to diagenesis, which is beneficial for preserving primary seawater information. Their elemental and isotopic composition is considered a reliable carrier of paleoceanographic chemical records. Geochemical systems represented by rare earth elements and oxygen, strontium, and calcium isotopes in conodonts have played a key role in revealing seawater redox conditions, acidity and alkalinity of paleooceans, surface seawater temperature, continental weathering, and paleoclimates. Conodont geochemical studies have been not only focusing on its application in the field of paleoenvironment and paleoclimatology, but also continuously delving into the microstructure of conodonts, especially the accurate extraction, evaluation, and screening of various elemental and isotopic information, with the aim of further improving the accurate application of conodont geochemistry. This paper reviews the morphology, structure, and paleoecological characteristics of conodonts, and on this basis, summarizes the study progress of rare earth elements and oxygen, strontium, and calcium isotope geochemistry of conodonts, in order to provide reference and inspiration for the development of conodont geochemistry and its application in paleoenvironmental and paleoclimatic studies.
- conodont /
- paleoceanography /
- paleotemperature /
- continental weathering /
- rare earth elements /
- oxygen isotopes /
- strontium isotope /
- calcium isotope /
- geochemistry

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图 1 牙形类动物及牙形石形貌特征

a. 牙形类动物保留在岩层中的印痕化石（产自下石炭统，现保存于苏格兰皇家博物馆.拍摄者：Derek Briggs）；b. 牙形类动物复原图（左），齿片状牙形石的乳白色牙冠、玻璃质牙冠和牙基的相对位置（中），牙形石多分子器官复原简图（右）.修改自Henderson（2021）

Fig. 1. Morphological characteristics of conodont animals and conodonts

下载: 全尺寸图片幻灯片

图 2 牙形石自然集群及多分子器官解析

a. 牙形石自然集合标本（上）与部分孤立离散的分子（下）的重建比较；B. 牙形石自然集群SEM照片；c. 对中三叠世Neogondolella自然集群的解析图. 米黄色. P分子；橙色. S0分子；棕色. S1和S2分子；黄色. S3和S4分子；绿色. M分子.据Goudemand et al.（2011）

Fig. 2. Conodont natural assemblages and the analysis of multi-element conodont apparatus

下载: 全尺寸图片幻灯片

图 3 利用不同的磷酸盐‒水的氧同位素分馏方程计算古海水温度对比

数据来源：磷酸盐‒水的氧同位素分馏方程来自Kolodny et al.（1983）、Pucéat et al.（2010）和Lécuyer et al.（2013）；晚二叠世‒早三叠世δ¹⁸O_牙形石数据来自Sun et al.（2012）和Joachimski et al.（2012）

Fig. 3. Comparison of paleoseawater temperature calculation formulas based on phosphate oxygen isotopes in previous studies

下载: 全尺寸图片幻灯片

图 4 晚泥盆世海洋⁸⁷Sr/⁸⁶Sr演变曲线

锶同位素数据来源：全岩腕足壳体（红色十字）据van Geldern et al.（2006）；全岩碳酸盐岩（蓝色方块）据黄思静（1997）；全岩碳酸盐岩（橘色方块（杨堤剖面））据Chen et al.（2013）；全岩牙形石（青色菱形（杨堤剖面）和紫色米字形（Kowala剖面））据Zhang et al.（2020）；全岩牙形石（绿色三角形（垌村剖面））据Wang et al.（2023）；微区原位牙形石（橘色圆圈（白沙剖面）和蓝色圆圈（杨堤剖面））据Zhao et al.（2024）

Fig. 4. Compiled ⁸⁷Sr/⁸⁶Sr data during the Late Devonian

下载: 全尺寸图片幻灯片

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