富钴铁锰结壳年代学研究方法进展
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摘要
富钴铁锰结壳是一种水成沉积型铁锰氧化物,生长速度极其缓慢,通常为1～2 mm/Ma,是研究古海洋长尺度环境变化及其与全球构造和气候变化关系的重要信息载体。通过数十年的实践,伴随着元素和同位素分析技术的进步以及仪器灵敏度的提高,富钴结壳年代学研究方法也取得了长足的进步。本文系统总结了富钴铁锰结壳年代学研究方法研究进展,分析了各种定年方法的优缺点和应用条件,同时绘制了更完善的80 Ma以来的海水Os同位素演化曲线图,并指出Os同位素地层学与Co经验模式公式相结合的定年方法是现阶段解决厚层富钴铁锰结壳年代问题的有效途径。
Cobalt-rich ferromanganese crust is a kind of water deposition type Fe-Mn oxide, with an extremely low growth rate of 1 to 2 mm/Ma. The cobalt-rich ferromanganese crust was considered important in studying the long scale environmental change of pale oceanography and its relationship with global structuring and climate change. There have been significant advances in the dating method of cobalt-rich crust through decades of practice, progress in technology of elemental and isotope analysis, and the improvement of instrument sensitivity. This paper systematically sums up the advances in dating methods of cobalt-rich ferromanganese crusts, reviews the advantages and disadvantages of different dating methods and their application conditions, and illustrates a more complete evolution curve of Os composition of global seawater from 80 Ma. Additionally, this paper suggests that combining the Os isotope stratigraphy with the Co empirical model formula is an effective way of dating older cobalt-rich ferromanganese crusts at the present stage.
Cobalt-rich ferromanganese crust is a kind of water deposition type Fe-Mn oxide, with an extremely low growth rate of 1 to 2 mm/Ma. The cobalt-rich ferromanganese crust was considered important in studying the long scale environmental change of pale oceanography and its relationship with global structuring and climate change. There have been significant advances in the dating method of cobalt-rich crust through decades of practice, progress in technology of elemental and isotope analysis, and the improvement of instrument sensitivity. This paper systematically sums up the advances in dating methods of cobalt-rich ferromanganese crusts, reviews the advantages and disadvantages of different dating methods and their application conditions, and illustrates a more complete evolution curve of Os composition of global seawater from 80 Ma. Additionally, this paper suggests that combining the Os isotope stratigraphy with the Co empirical model formula is an effective way of dating older cobalt-rich ferromanganese crusts at the present stage.
引文
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