通过矿物学和 HfNd 同位素代用指标证明白垩纪晚期冷却过程中西非克拉通的侵蚀和硅酸盐风化加剧

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Pauline Corentin , Emmanuelle Pucéat , Pierre Pellenard , Michel Guiraud , Justine Blondet , Germain Bayon , Thierry Adatte
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引用次数: 0

摘要

从都龙纪到 K/T 边界之间的海洋温度演变表明,在大气二氧化碳水平下降的同时,气候也在长期变冷,但当时气候变冷的原因仍存在争议。在本研究中,我们通过对西非边缘的碎屑粘土记录进行成对的钕(NdHf)同位素测量,评估了硅酸盐风化增强作为大气二氧化碳吸收汇的可能影响。在使用这种新的化学风化强度(ΔɛHf(t)粘土)代用指标的同时,还进行了其他矿物学和主要痕量元素分析,以研究机械侵蚀模式的变化,并进一步探索白垩纪晚期构造、风化和气候之间的潜在联系。我们的ΔɛHf(t)粘土数据表明,在桑顿纪至坎帕尼亚中期,西非克拉通的硅酸盐风化更为剧烈,与此同时,根据较高的石英/粘土和长石/粘土比率推断,物理侵蚀输入也有所增强。这一观察结果表明,当时化学风化作用的加强是由机械侵蚀作用的增强所驱动的,可能与西非克拉通的中等构造事件有关。在马斯特里赫特时期,高岭石含量增加,ΔɛHf(t)粘土值升高,这些证据表明当时的水解条件更加严重,导致中生代较古老的红土物质失稳,或有利于富含高岭石土壤的形成。总之,这项研究与大西洋南缘化学风化演变的一些新数据进行了比较,为白垩纪晚期构造-风化-气候之间的相互作用提供了新的见解,表明硅酸盐风化反馈与当时的全球变冷之间可能存在联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced erosion and silicate weathering of the West African craton during the late Cretaceous cooling evidenced by mineralogical and HfNd isotope proxies

The evolution of oceanic temperatures between the Turonian and the K/T boundary indicates a long-term cooling coincident with a decrease of atmospheric CO2 levels, yet the cause of climate cooling at that time still remains debated. In this study, we evaluated the possible implication of enhanced silicate weathering as a sink for atmospheric CO2 by applying paired NdHf isotope measurements to detrital clay records from the West African margin. The use of this novel proxy for chemical weathering intensity (ΔɛHf(t)clay) was complemented by additional mineralogical and major-trace element analyses in order to investigate the variability of mechanical erosion patterns and further explore potential linkages between tectonics, weathering and climate during the late Cretaceous.

Our ΔɛHf(t)clay data suggest more intense silicate weathering on the West African Craton during the Santonian to the middle Campanian period, coincident with enhanced physical erosional inputs as inferred from higher Quartz/Clays and Feldspar/Clays ratios. This observation suggests that the shift towards intensified chemical weathering at that time was driven by enhanced mechanical erosion, possibly related to a moderate tectonic event on the West African craton. Evidence for increasing kaolinite contents and higher ΔɛHf(t)clay values during the Maastrichtian point towards more hydrolysing conditions, inducing either destabilization of older Mesozoic lateritic material or favouring the development of kaolinite-rich soils.

Overall, this study was compared with several new data of chemical weathering evolution along the south Atlantic margins, adding new insights on tectonic-weathering-climate interactions during the late Cretaceous, suggesting a possible link between silicate weathering feedbacks and global cooling at that time.

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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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