摘要
形成于白垩纪期间的3个海洋大火成岩省——Kerguelen大火成岩省、Ontong Java大火成岩省和Caribbean大火成岩省被普遍认为是造成白垩纪2次全球性大洋缺氧事件的原因。建立大火成岩省与大洋缺氧事件之间因果关系的前提条件是二者同时发生。然而,由于在研究海洋大火成岩省的喷发年龄时,常用的定年对象容易受到海水蚀变等作用的影响,导致获得的年龄并不能都代表火山活动的时间。通过对3个海洋大火成岩省的所有年龄数据进行收集、可靠性评估和筛选,发现现有的可靠年龄数据虽然能证明大洋缺氧事件发生时3个大火成岩省有同时期的喷发活动,但大火成岩省的喷发时长和喷发节奏等方面的特征尚不明确,其与大洋缺氧事件之间的因果关系还有待于利用更多的年龄数据进行深入研究。
The three Cretaceous oceanic large igneous provinces of Kerguelen,Ontong Java,and Caribbean have been widely regarded as the triggers of the two Cretaceous global oceanic anoxic events.Synchronicity is the premise for ascribing a causal relationship between an oceanic large igneous province and an oceanic anoxic event.However,owing to the detrimental effect of seawater alteration on commonly used dating materials in oceanic basalts,the ages that have been published for oceanic large igneous provinces are not all robust.In this study,we compiled all published dating results for oceanic large igneous provinces and assessed the robustness of each age data.Results show that although the quality-filtered robust ages of the oceanic large igneous provinces can provide evidence of the existence of contemporaneous eruptions with the oceanic anoxic events,the eruptive duration and tempo of the oceanic large igneous provinces remain unclear.More age data are required to constrain the possible causal relationship between the three oceanic large igneous provinces and the two Cretaceous global oceanic anoxic events.
作者
江强
邱楠生
JIANG Qiang;QIU Nansheng(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum,Beijing 102249,China;College of Geosciences,China University of Petroleum,Beijing 102249,China)
出处
《地球科学进展》
CAS
CSCD
北大核心
2023年第9期890-903,共14页
Advances in Earth Science
基金
国家自然科学基金项目(编号:42302339)
中央高校基本科研业务费专项资金项目(编号:2462022BJRC011)资助
作者简介
First author:江强,讲师,主要从事同位素年代学和地球化学等方面的研究.E-mail:q.jiang@cup.edu.cn
