Oxygen isotope composition of Mesoproterozoic (~1360 Ma) seawater constrained by clumped isotopes of North China limestones

IF 12.5 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2025-10-17 DOI:10.1126/sciadv.adu6693

Pingping Li, Fang Hao, Shijie He, Haobo Chai, Yongfei Jiao, Yaxuan Gao, Huayao Zou

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Abstract

The oxygen isotope composition (δ 18 O) of Phanerozoic seawater has been widely investigated, but the δ 18 O values of Precambrian seawater remain poorly constrained, with ongoing debate over whether they were substantially lower than those of Phanerozoic seawater. To address this question, we analyzed the clumped isotopes of limestones from the North China Craton to reconstruct Mesoproterozoic seawater temperature and δ 18 O values. Our results indicate that the Mesoproterozoic seawater had a temperature of 26.9° ± 0.4°C and a δ 18 O value of −6.3 ± 0.2 per mil (relative to standard mean ocean water). This δ 18 O estimate aligns with previous inferences from geochemical modeling, marine iron oxides, and oxygen isotope ensembles, supporting the hypothesis that Mesoproterozoic seawater was isotopically lighter than its Phanerozoic counterpart. These findings provide insights into the Earth’s paleoclimate and the evolution of seawater composition during the Mesoproterozoic era.

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华北石灰岩团块同位素约束下中元古代（~1360 Ma）海水氧同位素组成

显生宙海水的氧同位素组成（δ 18o）已被广泛研究，但前寒武纪海水的δ 18o值仍未得到充分约束，是否明显低于显生宙海水的δ 18o值仍在争论中。为了解决这个问题，我们分析了华北克拉通灰岩的块状同位素，重建了中元古代海水温度和δ 18o值。结果表明，中元古代海水温度为26.9°±0.4°C， δ 18o值为- 6.3±0.2 / mil（相对于标准平均海水）。这一δ 18o估算值与先前地球化学模拟、海洋氧化铁和氧同位素集合的推断一致，支持了中元古代海水同位素比显生宙海水轻的假设。这些发现对中元古代地球的古气候和海水成分的演变提供了新的认识。

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.