大洋缺氧事件金属稳定同位素研究进展

doi:10.11867/j.issn.1001-8166.2022.085

地球科学进展 ›› 2022, Vol. 37 ›› Issue (11): 1127 -1140. doi: 10.11867/j.issn.1001-8166.2022.085

大洋缺氧事件金属稳定同位素研究进展

李聪颖 ¹ ^, ² ^, ⁴(

), 吴思璠 ¹ ^, ³ ^, ⁴

^1.中国科学院海洋研究所，深海研究中心，山东青岛 266071
^2.青岛海洋科学与技术试点国家实验室，海洋矿产资源评价与探测技术功能实验室，山东青岛 266237
^3.中国科学院大学，北京 100049
^4.中国科学院海洋大科学研究中心，山东青岛 266071

收稿日期:2022-07-31 修回日期:2022-10-18 出版日期:2022-11-10
基金资助:
国家自然科学基金面上项目“板块俯冲过程中铼的地球化学行为——以西北太平洋岛弧火山岩为例”(42176070);中国科学院青年创新促进会项目(2020212)

Advances in Research on Stable Metal Isotopes in Oceanic Anoxic Events

Congying LI ¹ ^, ² ^, ⁴( ), Sifan WU ¹ ^, ³ ^, ⁴

^1.Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
^2.Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
^3.University of Chinese Academy of Sciences, Beijing 100049, China
^4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

Received:2022-07-31 Revised:2022-10-18 Online:2022-11-10 Published:2022-11-16
About author:LI Congying (1984-), female, Minquan County, Henan Province, Associate professor. Research area includes marine geology. E-mail: licongying@qdio.ac.cn
Supported by:
the National Natural Science Foundation of China “Geochemical behavior of rhenium during subduction: a case study of volcanic rocks in the northwest Pacific island arc”(42176070);The Youth Innovation Promotion Association of Chinese Academy of Sciences(2020212)

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白垩纪大洋缺氧事件记录了地球气候和古海洋环境的显著变化，是全球碳循环的主要扰动事件，受到了国内外学者的广泛关注。近20年来，随着金属稳定同位素测试技术的发展，越来越多的金属稳定同位素（例如钼同位素、锌同位素、铀同位素、铬同位素、镉同位素和钙同位素等）被用于研究大洋缺氧事件期间的环境变化。通过系统总结钼同位素（δ⁹⁸Mo）、锌同位素（δ⁶⁶Zn）和铀同位素（δ²³⁸U）的地球化学性质以及在大洋缺氧事件中的研究进展，发现钼同位素主要用于指示局部海洋硫化和非硫化环境的转变过程；锌同位素多用于区分局部海洋对初级生产力、大陆风化以及沉积物埋藏/分解等过程的不同响应情况；铀同位素可以估算全球海底缺氧面积占海底总面积的比例，同时可以结合碳—磷—铀耦合模型模拟全球海洋对大火成岩省形成、大陆风化、生物活动等过程的响应机制。但目前这些金属稳定同位素在海洋体系中的循环分馏机制尚未完善，且研究对象主要聚焦于大洋缺氧事件OAE2的沉积记录，未来还需要更系统全面的研究。

关键词: 大洋缺氧事件, 金属稳定同位素, 钼同位素, 锌同位素, 铀同位素

Cretaceous Oceanic Anoxic Events (OAEs) have recorded significant changes in the climatic and paleoceanographic states of the planet and represent major carbon cycle perturbations. In the past two decades, analytical techniques for stable metal isotopes, such as molybdenum, zinc, uranium, chromium, cadmium, and calcium isotopes, have been developed to study OAEs. By systematically summarizing the geochemical characteristics of molybdenum isotopes (δ⁹⁸Mo), zinc isotopes (δ⁶⁶Zn), and uranium isotopes (δ²³⁸U), and research advances on Cretaceous OAEs, we found that molybdenum isotopes mainly reflect the transformation between sulfide and non-sulfide in the regional marine environment during OAEs. Zinc isotopes can reflect different responses of regional marine environments to different processes, such as primary productivity, continental weathering, and sediment burial/decomposition. Uranium isotopes can be used to estimate the global extent of seafloor euxinia. The coupled global C-P-U cycle model can simulate the response mechanism of the global ocean to different processes, such as the formation of large igneous provinces, continental weathering, and biological activities. However, the cyclic fractionation mechanism of these isotopes in marine systems is still in progress, and most research has only focused on the deposition record of OAE2. In the future, it will be necessary to conduct more systematic research on OAEs.

Key words: Oceanic anoxic events, Metal stable isotopes, Molybdenum isotopes, Zinc isotopes, Uranium isotopes

中图分类号:

P736.4

图1 大洋缺氧事件的地层位置和命名
据参考文献［ 1 ］修改，OAE1c的地层年龄数据添加自参考文献［ 2 ］

Fig. 1 The stratigraphic position and nomenclature of OAEs
Modified after reference ［ 1 ］；The stratigraphic age of OAE1c is from reference ［ 2 ］

图2 DSDP site 367剖面的 δ¹³C_org 和 δ⁹⁸Mo图（据参考文献［ 84 ］修改）

Fig. 2 δ¹³C_org and δ⁹⁸Mo composition of DSDP site 367 （modified after reference ［ 84 ］）

图3 Eastbourne和贡扎剖面的 δ¹³C_carb 和 δ⁶⁶Zn图（据参考文献［ 30 ］修改）

Fig. 3 δ¹³C_carb and δ⁶⁶Zn composition of Eastbourne and Gongzha （modified after reference ［ 30 ］）

图4 Eastbourne剖面的 δ¹³C_carb 和 δ²³⁸U图（据参考文献［ 20 ］修改）

Fig. 4 δ¹³C_carb and δ²³⁸U composition of Eastbourne （modified after reference ［ 20 ］）

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