中塞诺曼事件(MCE)开始时增强的大陆风化活动

IF 3.4 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Geochemical Perspectives Letters Pub Date : 2022-09-01 DOI:10.7185/geochemlet.2231
L. Nana Yobo, A. Brandon, L.M. Lauckner, J. Eldrett, S. Bergman, D. Minisini
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引用次数: 1

摘要

大火成岩省(LIP)的侵位与Cenomanian-Turonian Oceanic缺氧事件2 (OAE 2)的触发有关。中cenomanian事件(MCE)的类似启动机制的证据尚不清楚。在本研究中,对西部内陆海道的第一个中cenomanian海水187 o / 188 o进行了重建,测试了LIP和大陆风化活动在触发MCE中的竞争作用。在MCE间隔开始时,没有出现长时间的非放射性成因Os同位素偏移(低187 Os/ 188 Os),这表明LIP参与了事件的开始。更确切地说,187o / 188o在开始时的放射成因较多,并继续上升到MCE中部,表明该事件是由大陆风化作用加剧引发的。从MCE中部开始,187os / 188os的减少,与加拿大Ellesmere岛玄武岩96.4 Ma的40ar / 39ar年龄相一致,与高北极唇相关的火山活动可能导致了MCE的结束。这些关于MCE的新数据表明,LIP活动并不总是碳循环扰动和相关气候变化的触发因素。
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Enhanced continental weathering activity at the onset of the mid-Cenomanian Event (MCE)
The emplacement of a Large Igneous Province (LIP) is implicated in the triggering of the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE 2). Evidence for a similar initiation mechanism for the mid-Cenomanian Event (MCE) is unclear. In this study, a reconstruction of mid-Cenomanian seawater 187 Os/ 188 Os, the first for the Western Interior Seaway, tests the competing roles of LIP versus continental weathering activity in triggering the MCE. The absence of a prolonged unradiogenic Os isotope excursion (low 187 Os/ 188 Os) at the onset of the MCE interval argues against LIP involvement in the event ’ s initiation. Rather, more radiogenic 187 Os/ 188 Os at the onset, that continues to rise to the middle of the MCE, indicates that the event was triggered by increased continental weathering. The combination of decreasing 187 Os/ 188 Os from the middle of the MCE onward, coincident with a 40 Ar/ 39 Ar age of 96.4 Ma of basalts from Ellesmere Island, Canada, is consistent with High Arctic LIP-related volcanic activity that may have contributed to the end of the MCE. These new data on the MCE thus indicate that LIP activity is not always the trigger for carbon cycle perturbation and associated climate change.
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来源期刊
Geochemical Perspectives Letters
Geochemical Perspectives Letters Earth and Planetary Sciences-Geochemistry and Petrology
CiteScore
7.00
自引率
2.00%
发文量
42
审稿时长
15 weeks
期刊介绍: Geochemical Perspectives Letters is an open access, internationally peer-reviewed journal of the European Association of Geochemistry (EAG) that publishes short, highest-quality articles spanning geochemical sciences. The journal aims at rapid publication of the most novel research in geochemistry with a focus on outstanding quality, international importance, originality, and stimulating new developments across the vast array of geochemical disciplines.
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