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白垩纪大洋缺氧事件研究进展
范庆超, 徐兆凯
中国科学院海洋研究所
摘要:
白垩纪是地质历史过程中的一个极端温室时期,发生了一系列的异常事件,大洋缺氧事件(OAEs)就是其中的典型代表。白垩纪OAEs记录了地球极端气候时期全球碳循环的重大扰动,对于探索海-气系统对二氧化碳浓度升高的响应机制具有重要意义。本文综述了白垩纪OAEs的研究进展,重点讨论了OAE1a、OAE1b和OAE2时期的有机碳(TOC)含量、碳同位素、古温度和锶同位素特征及其古环境指示意义,综合分析了白垩纪OAEs的成因机制。现有研究普遍认为白垩纪OAEs的发生可能与该时期海底大规模的火山活动以及由其引起的气温升高、碳水化合物大量分解、水文循环加快和海洋生物生产力提高等一系列变化有关。但是当前的研究区域主要集中在大西洋/特提斯盆地及其周边陆地,而对南半球高纬度地区的研究报道迄今未见,从而无法对白垩纪OAEs进行全球性对比和系统性研究。目前作者已通过登船参加2017年底执行的国际大洋发现计划(IODP)369航次成功获取到南半球高纬度地区的典型白垩纪OAEs沉积物样品,并获得了国家自然科学基金面上项目的资金支持,今后我们将重点围绕该地区白垩纪OAEs的演化特征、成因机制及其古气候环境效应等进行深入研究。
关键词:  白垩纪  大洋缺氧事件  碳循环  古环境
DOI:10.11759/hykx20190303001
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Review on the Cretaceous Ocean Anoxia Events
fanqingchao, xuzhaokai
Institute of Oceanology, Chinese Academy of Sciences
Abstract:
The Cretaceous was one of the warmest greenhouse climate periods of the Phanerozoic, and was characterized by a series of anomalous events such as Oceanic Anoxic Events (OAEs). Cretaceous OAEs recorded significant perturbation of the global carbon cycle during the extreme climate of the Earth, which is of great significance for exploring the response mechanism of the?ocean-atmosphere?system to elevated carbon dioxide concentrations. This paper reviews the research progress of Cretaceous OAEs, focusing on the TOC content, carbon isotope, paleotemperature, strontium isotope characteristics and their potential significance for paleoenvironment during the periods of OAE1a, OAE1b and OAE2, and comprehensively analyses the genesis mechanism of Cretaceous OAEs. Current studies suggest that the occurrence of Cretaceous OAEs may related with the large-scale submarine volcanism during that period, as well as a series of changes caused by it, such as the increasing of atmospheric temperature, massive decomposition of carbohydrates, the acceleration of hydrological cycle and the increase of marine biological productivity. However, the current research areas of Cretaceous OAEs is mainly located in the Atlantic/Tethys Basin and its surrounding land, while the systematic study of the Cretaceous OAEs in the high latitudes of the Southern Hemisphere has not yet been conducted. Recently, the authors have successfully obtained typical Cretaceous OAEs sediment samples from high latitudes of the Southern Hemisphere through the International Ocean Discovery Program (IODP), Expedition 369, and obtained funding support from the National Natural Science Foundation of China. In the future, we will focus on the evolution characteristics, genetic mechanism and paleoclimatic and environmental effects of the Cretaceous OAEs in this area.
Key words:  Cretaceous  Oceanic Anoxic Events  Carbon cycle  Paleoenvironment
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