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

被引：4

作者：

Li, Youjuan ^{[1
]}

Singer, Brad S. ^{[1
]}

Takashima, Reishi ^{[2
]}

Schmitz, Mark D. ^{[3
]}

Podrecca, Luca G. ^{[4
]}

Sageman, Bradley B. ^{[4
]}

Selby, David ^{[5
]}

Yamanaka, Toshiro ^{[6
]}

Mohr, Michael T. ^{[3
]}

Hayashi, Keiichi ^{[7
]}

Tomaru, Taiga ^{[8
]}

Savatic, Katarina ^{[4
]}

机构：

[1] Univ Wisconsin Madison, Dept Geosci, Madison, WI 53706 USA

[2] Tohoku Univ, Tohoku Univ Museum, Aoba Ku, Sendai, 9808578, Japan

[3] Boise State Univ, Dept Geosci, Boise, ID 83725 USA

[4] Northwestern Univ, Dept Earth & Planetary Sci, Evanston, IL 60208 USA

[5] Univ Durham, Dept Earth Sci, Durham DH1 3LE, England

[6] Tokyo Univ Marine Sci & Technol, Sch Marine Resources & Environm, Tokyo 1088477, Japan

[7] Hokkaido Res Org, Environm & Geol Res Dept, Geol Survey Hokkaido, Nishi 12,Kita 19,Kita Ku, Sapporo, Hokkaido 0600819, Japan

[8] Tohoku Univ, Grad Sch Sci, Dept Earth Sci, Aoba Ku, Sendai 9808578, Japan

来源：

SCIENCE ADVANCES | 2024年 / 10卷 / 47期

关键词：

ONTONG [!text type='JAVA']JAVA[!/text] PLATEAU; CARBON-ISOTOPE STRATIGRAPHY; ROQUEFORT-LA BEDOULE; 40AR/39AR GEOCHRONOLOGY; INTEGRATED STRATIGRAPHY; KERGUELEN PLATEAU; MAGNETOCHRON M0R; RICH SEDIMENTS; APTIAN STAGE; BARENTS SEA;

D O I：

10.1126/sciadv.adn8365

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 similar to 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 similar to 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.

引用

页数：12

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