Radioisotopic chronology of Ocean Anoxic Event 1a: Framework for analysis of driving mechanisms

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2024-11-20 DOI:10.1126/sciadv.adn8365

Youjuan Li, Brad S. Singer, Reishi Takashima, Mark D. Schmitz, Luca G. Podrecca, Bradley B. Sageman, David Selby, Toshiro Yamanaka, Michael T. Mohr, Keiichi Hayashi, Taiga Tomaru, Katarina Savatic

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Abstract

The timing, tempo, and causative mechanisms of Ocean Anoxic Event 1a (OAE1a), one of several such abrupt perturbations of the Mesozoic global carbon cycle, remain uncertain. Mudstones interbedded with tuffs in Hokkaido, Japan preserve carbon and osmium isotope shifts recording OAE1a. U-Pb zircon ages of tuffs constrain the OAE1a onset to 119.55 +0.072/−0.079 million years ago (Ma) and its duration to 1116 +87/−93 thousand years (kyr). Isotopic excursions of osmium followed by carbon that mark the rapid onset of OAE1a each lasted ~115 kyr. Critically, the occurrence of index fossil Leupoldina cabri in the Hokkaido OAE1a section, which also caps and thus postdate Ontong Java Plateau (OJP) basalts, has a U-Pb zircon age of ~118.7 to 118.4 Ma. Therefore, OJP volcanism remains a probable source of unradiogenic osmium and light carbon and a causative mechanism of OAE1a.

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海洋缺氧事件 1a 的放射性同位素年代学：驱动机制分析框架

海洋缺氧事件 1a（Ocean Anoxic Event 1a，OAE1a）是中生代全球碳循环的几次突然扰动之一，其时间、节奏和致因机制仍不确定。日本北海道与凝灰岩互层的泥岩保留了记录 OAE1a 的碳和锇同位素变化。凝灰岩的 U-Pb 锆石年龄将 OAE1a 的起始时间推定为距今 119.55 +0.072/-0.079 百万年（Ma），持续时间推定为 1116 +87/-93 千年（kyr）。标志着 OAE1a 快速发生的锇同位素偏移和碳同位素偏移各持续了约 115 千年。重要的是，北海道 OAE1a 断面中出现的指数化石 Leupoldina cabri 的 U-Pb 锆石年龄约为 118.7 至 118.4 千年，该化石也覆盖了翁通爪哇海台（OJP）玄武岩，因此其年代也在翁通爪哇海台之后。因此，OJP火山活动仍然是非辐照成因锇和轻碳的可能来源，也是OAE1a的成因机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.