美国俄勒冈州立大学Peter C. Davidson的课题组报道了Ontong Java高原更年轻和持久的侵位。2023年6月16日，国际知名学术期刊《科学》发表了这一成果。

课题组人员提供了来自Ontong Java高原的钻探，以及挖掘地点的高精度 ⁴⁰Ar/ ³⁹Ar 的数据，这些数据极大地改善了Ontong Java 高原的喷发历史。本文的研究工作确定的年龄比以前的日期年轻了1千万年，表明其形成时间至少延长了6百万年。目前来看，Ontong Java 高原太年轻，不太可能导致海洋缺氧事件1a ，但课题组人员认为他可能在后来的海洋缺氧事件1b 中起到了一定的作用。延长的喷发序列对 Ontong Java 高原和其他大火成岩省的侵位动力学有重要影响。

据了解，Ontong Java 高原(OJP)的海底火山侵位被认为是导致海洋缺氧事件1a (OAE 1a)的原因。然而，Ontong Java 高原的形成没有精确的时间和持续范围，它与海洋缺氧事件1a 的联系主要依赖于沉积记录中的替代物。

附：英文原文

Title: A younger and protracted emplacement of the Ontong Java Plateau

Author: Peter C. Davidson, Anthony A. P. Koppers, Takashi Sano, Takeshi Hanyu

Issue&Volume: 2023-06-16

Abstract: The submarine volcanic emplacement of the Ontong Java Plateau (OJP) is the suggested cause of Ocean Anoxic Event 1a (OAE 1a). However, no precise timing and duration exists for the formation of OJP, and its connection to OAE1a relies mainly on proxies in the sedimentary record. We provide high-precision ⁴⁰Ar/³⁹Ar data from OJP drill and dredge sites that considerably improve OJP’s eruptive history. The ages determined from this work are as much as 10 million years younger than previous dates and indicate a protracted formation over at least 6 million years. OJP now appears too young to have caused OAE1a, but we suggest that it may have had a role in the later OAE1b. The protracted eruptive sequence has implications for the emplacement dynamics of OJP and other large igneous provinces.

DOI: ade8666

Source: https://www.science.org/doi/10.1126/science.ade8666