globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.02.019
论文题名:
Kaolins in gravels and saprolites in north-east Scotland: Evidence from stable H and O isotopes for Palaeocene-Miocene deep weathering
作者: Hall A.M.; Gilg H.A.; Fallick A.E.; Merritt J.W.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 424
起始页码: 6
结束页码: 16
语种: 英语
英文关键词: Buchan Gravel ; Cenozoic ; Kaolin ; Palaeotemperature ; Scotland ; Weathering
英文摘要: Stable isotope ratios can provide important evidence for estimating groundwater temperatures during the formation of clay minerals in response to chemical weathering of rocks at the landsurface. In this paper, we investigate weathering kaolins found in Buchan, NE Scotland. Stable oxygen and hydrogen isotopes for kaolins from weathered clasts in post-Cretaceous fluvial gravels and from clay-rich saprolites developed in Dalradian metamorphic and Caledonian igneous rocks indicate weathering under warm groundwater temperatures of 23. ±. 5. °C. Comparisons with Cenozoic palaeotemperatures derived from North Sea sediments indicate that weathering took place under humid tropical climates of the Palaeocene-Eocene. The >. 25. m deep weathering profiles in the Buchan Gravels indicate that these coarse, quartzite- and flint-bearing gravels are older than previously thought and were likely deposited by rivers which also fed thick Palaeocene-Early Eocene deep-water sand fans in the western North Sea basin. A later phase of kaolin weathering at lower temperatures of 15. ±. 5. °C took place in the Middle Miocene. Kaolinitic weathering remnants are largely confined to elevations of >. 100. m in eastern Buchan and define a well-preserved, deeply weathered Cenozoic landscape in north-east Scotland. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68988
Appears in Collections:过去全球变化的重建

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作者单位: Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden; Lehrstuhl für Ingenieurgeologie, Technische Universität München, Arcisstr. 21, Munich, Germany; Scottish Universities Environmental Research Centre, East Kilbride, Scotland, Glasgow, United Kingdom; British Geological Survey, Murchison House, West Mains Road, Edinburgh, Scotland, United Kingdom

Recommended Citation:
Hall A.M.,Gilg H.A.,Fallick A.E.,et al. Kaolins in gravels and saprolites in north-east Scotland: Evidence from stable H and O isotopes for Palaeocene-Miocene deep weathering[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,424
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