Anomalous weathering records in the Cleveland Basin (Yorkshire, UK) during the T‐OAE global warming

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Terra Nova Pub Date : 2022-12-10 DOI:10.1111/ter.12639
Yunfeng Wang
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引用次数: 0

Abstract

Early Toarcian (~183 Ma) was marked by a global warming event which accelerated continental chemical weathering. To constrain the early Toarcian weathering intensity of a Cleveland Basin (Yorkshire, UK) region, this study employed its sediment chemical weathering proxies (potassium/aluminium (K/Al) and K/rubidium (K/Rb)). The K/Al and K/Rb exhibit an anomalous chemical weathering intensity signal from the contemporaneous warm, moist world. Variations in weathering intensity for the Yorkshire section inversely comply with detrital grain size changes (indicated by Al/silicon (Al/Si)). This finding implies that continental chemical weathering did not play a major role in changing detrital grain sizes in the Yorkshire sediments. Instead, short‐term sea‐level changes in the Cleveland Basin can explain the stratigraphic variations in detrital grain sizes. Anomalies of geochemical proxies for chemical weathering and eustatic sea‐level changes do exist at local scales possibly driven by Milankovitch cycle, which reminds us to be more careful when reconstructing palaeoclimate states.
T‐OAE全球变暖期间克利夫兰盆地(英国约克郡)的异常风化记录
早期托阿尔纪(~183 马)的标志是全球变暖事件加速了大陆的化学风化。为了限制克利夫兰盆地(英国约克郡)地区的早期托阿尔纪风化强度,本研究采用了其沉积物化学风化指标(钾/铝(K/Al)和钾/铷(K/Rb))。K/Al和K/Rb表现出来自同期温暖潮湿世界的异常化学风化强度信号。约克郡剖面的风化强度变化与碎屑粒度变化呈反比(由Al/硅(Al/Si)表示)。这一发现表明,大陆化学风化在改变约克郡沉积物中碎屑粒度方面并没有发挥主要作用。相反,克利夫兰盆地的短期海平面变化可以解释碎屑粒度的地层变化。化学风化和海平面升降的地球化学指标异常在局部范围内确实存在,可能是由Milankovich旋回驱动的,这提醒我们在重建古气候状态时要更加小心。
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
Terra Nova
Terra Nova 地学-地球科学综合
CiteScore
4.80
自引率
8.30%
发文量
59
审稿时长
2.3 months
期刊介绍: Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.
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