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Upper Permian-Lower Cretaceous clay mineralogy of East Greenland; provenance, palaeoclimate and volcanicity

H. Lindgreen and F. Surlyk
Upper Permian-Lower Cretaceous clay mineralogy of East Greenland; provenance, palaeoclimate and volcanicity
Clay Minerals (December 2000) 35 (5): 791-806

Abstract

The clay mineralogy of Upper Permian-Lower Cretaceous mudstones from East Greenland has been investigated by X-ray diffraction (XRD), atomic force microscopy (AFM) and thermal analysis in order to evaluate long-term trends in provenance and palaeoclimate and to detect possible volcanic events. The Upper Permian-Lower Triassic mudstones contain illite, chlorite, vermiculite, kaolinite and illite-smectite (I-S), whereas the Rhaetian-Sinemurian mudstones are dominated by kaolinite. Aalenian-Albian mudstones contain kaolinite and large amounts of I-S with approximately 80% illite layers. Exceptions are three Kimmeridgian samples, which contain mainly I-S with 30% illite layers, and three Upper Barremian-Lower Aptian samples with large amounts of smectite layers. Discrete clay minerals in the Upper Permian-Jurassic mudstones are largely detrital. The smectite-rich I-S probably reflects episodes of volcanic activity in late Jurassic and late Barremian-early Aptian times. This is the first indication of Mesozoic volcanism from the Mesozoic rift basin of East Greenland. The main sediment source during late Permian-early Cretaceous times was weathered Precambrian and Caledonian crystalline basement. The only possibly climate-induced change is a change from chlorite, illite, vermiculite and kaolinite in Upper Permian-Lower Triassic mudstones to kaolinite and I-S in the Jurassic mudstones and is probably due to an increase in precipitation.


ISSN: 0009-8558
EISSN: 1471-8030
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 35
Serial Issue: 5
Title: Upper Permian-Lower Cretaceous clay mineralogy of East Greenland; provenance, palaeoclimate and volcanicity
Affiliation: Geological Survey of Denmark and Greenland, Clay Mineralogical Laboratory, Copenhagen, Denmark
Pages: 791-806
Published: 200012
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 53
Accession Number: 2002-025251
Categories: Sedimentary petrologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart
Secondary Affiliation: University of Copenhagen, DNK, Denmark
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200210
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