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Metamorphosed palaeosols associated with Cretaceous fossil forests, Alexander Island, Antarctica

J. Howe and J. E. Francis
Metamorphosed palaeosols associated with Cretaceous fossil forests, Alexander Island, Antarctica
Journal of the Geological Society of London (December 2005) 162 (6): 951-957

Abstract

Fossil soils are present within mid-Cretaceous fluvial sediments of the Fossil Bluff Group, Alexander Island, Antarctica. The palaeosols contain in situ fossil trees and rooted plants. These palaeosols are typically composed of two dominant horizons: an upper organic-rich horizon with identifiable plant remains, and a lower horizon with well-developed blocky ped structures, clay cutans and mottling. These features are typical of modern soils in seasonally dry climates. Although evidence of flooding is apparent from interbedded fluvial sandstones and mudstones, the palaeosols indicate that this high-latitude mid-Cretaceous environment was predominantly seasonally dry. The presence of the zeolites laumontite, prehnite and pumpellyite indicates a later metamorphic overprint on the palaeosols, resulting from burial diagenesis of this region at depths of about 3.8-5.2 km and temperatures of 150-170 degrees C.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 162
Serial Issue: 6
Title: Metamorphosed palaeosols associated with Cretaceous fossil forests, Alexander Island, Antarctica
Affiliation: University of Leeds, Earth Sciences, Leeds, United Kingdom
Pages: 951-957
Published: 200512
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 35
Accession Number: 2005-074516
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map, strat. col.
S72°00'00" - S72°00'00", W68°30'00" - W68°30'00"
Secondary Affiliation: British Antarctic Survey, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200544
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