Formation of diagenetic illite in sandstones of the Garn Formation, Haltenbanken area, Mid-Norwegian continental shelf

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Authors:Ehrenberg, S. N.; Nadeau, P. H.
Author Affiliations:Primary:
Geol. Lab., Stavanger, Norway
Volume Title:Clay Minerals
Source:Clay Minerals, 24(2), p.233-253. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558
Publication Date:1989
Note:In English. 27 refs.; illus. incl. 1 table, 2 plates
Summary:XRD and petrographic analyses of core samples from 11 wells show that a transition from incipient to extensive illitization in these sandstones is associated with a present burial depth of 3.7 km below the sea-floor, corresponding with a formation T of 140 degrees C. Illite has formed by reaction between K-feldspar and earlier diagenetic kaolinite, and probably by mica alteration. There are no indications that illitization was inhibited by the presence of hydrocarbons in pore spaces. It is suggested that 20- 30% residual water saturation is sufficient for extensive illitization to occur by short-range diffusive transport in a compostionally closed system, but there is a problem regarding the timing and the cause of illitization which may reflect errors in the K/Ar dates due to a contamination problem. [R.E.S.]
Subjects:Cenozoic; Clastic rocks; Clay mineralogy; Continental shelf; Dates; Diagenesis; Garn Formation; Holocene; Illite; Illitization; K/Ar; Mineral data; Minerals; Oceanography; Processes; Quaternary; Sandstone; Sedimentary petrology; Sedimentary rocks; SEM data; Sheet silicates; Silicates; Arctic Ocean; Atlantic Ocean; Europe; Haltenbanken; North Atlantic; North Sea; Norway; Norwegian Sea; Scandinavia; Western Europe; Northern North Sea
Coordinates:N510000 N611000 E0110000 W0040000
Abstract Numbers:90M/2651
Record ID:1989080953
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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