A record of late Cenozoic stratigraphy, sedimentation and climate change from the Hebrides Slope, NE Atlantic Ocean

Journal of the Geological Society - Tập 151 Số 2 - Trang 235-249 - 1994
Martyn S. Stoker1, A. G. Leslie1, William Scott2, J. C. Briden2, Nicolette M. Hine3, Rex Harland3, Ian P. Wilkinson3, D. Evans1, D. A. Ardus1
1British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK
2Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK
3British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK#TAB#

Tóm tắt

A punctuated 103.3 m thick succession of upper Palaeogene to Quaternary sediments has been recovered in a borehole from the upper Hebrides Slope, west of Britain. The borehole proved 11.2m of upper Oligocene, carbonate-rich muds at the base, unconformably overlain by 2.85 m of middle to upper Miocene, glauconitic sands. This is in turn unconformably overlain by 89.25 m of predominantly Plio-Pleistocene sands and muds, with a Holocene sea-bed veneer. The post-Miocene succession is subdivided into two units: the sand-dominated, Pliocene to lower middle Pleistocene, Lower MacLeod sequence between 89.25 and 67.82 m, and the mud-dominated, middle Pleistocene to Holocene, Upper MacLeod sequence above 67.82 m. Regional mapping indicates that these sequences are commonly associated with large-scale shelf-margin progradation and slope-front fan construction. The borehole core provides an excellent record of the transition from pre-glacial to glacial conditions in the mid-latitude NE Atlantic Ocean. Climatic conditions warmer than present prevailed in the late Oligocene, mid- to late Miocene and Pliocene, although the influx of ice-rafted detritus in the late Pliocene marks the onset of climatic deterioration. This deterioration continued, in a fluctuating manner, until the early mid-Pleistocene (0.44 Ma) when fully glacial conditions were established on the Hebridean Margin.

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Journal of the Geological Society

Tập 151 Số 2

235-249

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