牙形刺氧同位素古温度计:研究进展与展望  

Oxygen Isotope Palaeothermometry of Conodont Apatite:A review

作　　者：刘康[1,2,3] 周锡强[1,2,3] 江茂生 LIU Kang;ZHOU XiQiang;JIANG MaoSheng(Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院新生代地质与环境重点实验室,北京100029 [2]中国科学院地球科学研究院,北京100029 [3]中国科学院大学地球与行星科学学院,北京100049

出　　处：《沉积学报》2022年第2期396-409,共14页Acta Sedimentologica Sinica

基　　金：国家自然科学基金(41573010,41272134);中国科学院地质与地球物理研究所重点研究项目(IGGCAS-201905)。

摘　　要：牙形刺是寒武系至三叠系海相地层里常见的磷酸盐质古生物化石,具有分布较广、易于保存等优势,其氧同位素可用于重建同时期海水温度,受到广泛关注和重视。从牙形刺基本特征、氧同位素古温度计原理、氧同位素分析测试方法等方面,对牙形刺氧同位素古温度计的基本特点和原理进行了回顾。在此基础上,进一步讨论了牙形动物生物习性、成岩作用改造、量化计算方式等多种因素对牙形刺氧同位素定量重建古海水温度的潜在影响。目前,牙形刺氧同位素古温度计在古海水温度重建、牙形动物生物习性研究、及古地理格局重建等方面开展了大量重要应用,相关研究成果极大促进了我们对深时环境和生物演化的认识。未来,深入研究牙形刺磷酸盐氧同位素与同时期海水的分馏机理、精细厘定牙形动物关键属种的生物习性、有效评估成岩作用对牙形刺氧同位素组成改造程度,并充分考量特定时期研究区古地理背景,将有助于牙形刺氧同位素古温度计在古海洋、古环境和古生物研究中发挥更大的作用。Conodonts are phosphatic fossils widely distributed in Cambrian to Triassic marine strata.Due to the ad⁃vantage of well preservation,the oxygen isotope values of conodont apatite have been used to constrain coeval seawa⁃ter temperature.In this context,we make a review of the development of oxygen isotope palaeothermometry,includ⁃ing the aspects of biological features,geochemical fundamentals,and oxygen isotope measuring methods of conodont apatite.We further summarize the three main factors that are critical for a quantitatively accurate reconstruction of the paleotemperature in deep time,including the life habit of conodont animals,diagenetic alteration of oxygen isotopes,and empirical formulas for paleotemperature value calculation based on phosphate oxygen isotopes.Presently,oxygen isotope palaeothermometry of conodont apatite has been widely and successfully applied in reconstructions of the pa⁃leo-oceanic temperature,living habit of conodont animals,and paleogeographic configurations,which have signifi⁃cantly enhanced our understanding of deep-time paleoenvironmental and life evolution.In the future,the develop⁃ment and application of this paleothermometer would be favored for more deep studies on the oxygen isotope fraction⁃ation mechanism between conodont and coeval seawater,the ecology of key conodont animal species,evaluation of diagenetic alteration,and full consideration of the paleogeographic background.Undoubtedly,oxygen isotope palaeo⁃thermometry of conodont apatite will play an indispensable role in paleo-oceanic,paleo-environmental,and paleonto⁃logical studies.

关 键 词：牙形刺 氧同位素 古海洋 古温度 

分 类 号：Q915[天文地球—古生物学与地层学]