牙形刺氧同位素古温度计:研究进展与展望

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、...

Oxygen Isotope Palaeothermometry of Conodont Apatite:A review

Conodonts are phosphatic fossils widely distributed in Cambrian to Triassic marine strata. Due to the advantage of well preservation， the oxygen isotope values of conodont apatite have been used to constrain coeval seawater temperature. In this context， we make a review of the development of oxygen isotope palaeothermometry， including 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 paleo-oceanic temperature， living habit of conodont animals， and paleogeographic configurations， which have significantly enhanced our understanding of deep-time paleoenvironmental and life evolution. In the future， the development and application of this paleothermometer would be favored for more deep studies on the oxygen isotope fractionation 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 palaeothermometry of conodont apatite will play an indispensable role in paleo-oceanic， paleo-environmental， and paleontological studies.