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Pseudomorphous transformation of goethite needles into hematite in sediments of the Triassic Skagerrak Formation, Denmark

Published online by Cambridge University Press:  09 July 2018

R. Weibel  and
B. Grobety
R. Weibel
Affiliation:
Department of Earth Sciences, University of Aarhus, DK-8000 Aarhus C, Denmark
B. Grobety
Affiliation:
Department of Earth Sciences, University of Aarhus, DK-8000 Aarhus C, Denmark
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Extract

Van Houten (1973), Walker (1976) and Turner (1980) have documented the authigenic origin of red coatings in continental red beds. Pigmentary hematite, ferrihydrite, goethite and clay-associated Fe-oxide crystallites have been suggested as the principal colouring agents of continental red beds (Walker, 1968, 1976; Walker & Honea, 1969; Larson & Walker, 1975; Turner, 1980; Fine, 1986, Besly et al., 1993). The red pigment in most Mesozoic red beds consists of hematite, whereas ferrihydrite and goethite are more common in younger sediments (van Houten, 1973). This has led several authors to the assumption that poorly crystalline Fe-oxides/hydroxides age into hematite (Walker, 1968, 1976; Walker & Honea, 1969; Larson & Walker, 1975; Turner, 1980).

Type
Note
Information
Clay Minerals , Volume 34 , Issue 4 , December 1999 , pp. 657 - 660
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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