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Smectite to illite diagenesis in early Miocene sediments from the hyperthermal western Pannonian Basin

Published online by Cambridge University Press:  09 July 2018

R. F. Sachsenhofer ,
G. Rantitsch ,
C. Hasenhüttl ,
B. Russegger  and
B. Jelen
R. F. Sachsenhofer
Affiliation:
Institut für Geowissenschafien, Montanuniversität Leoben, A-8700 Leoben, Austria
G. Rantitsch
Affiliation:
Institut für Geowissenschafien, Montanuniversität Leoben, A-8700 Leoben, Austria
C. Hasenhüttl
Affiliation:
Institut für Geowissenschafien, Montanuniversität Leoben, A-8700 Leoben, Austria
B. Russegger
Affiliation:
Institut für Geowissenschafien, Montanuniversität Leoben, A-8700 Leoben, Austria
B. Jelen
Affiliation:
Institut za Geologija, Geoloski Zavod Ljub(jana, Dimiceva 14. Slo-61000 Ljubljana, Slovenia
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Abstract

The smectite to illite transformation in early Miocene sediments was studied in wells and outcrops in the western Pannonian Basin, where magmatic activity caused very high Miocene heat flows (250-400 mW/m2). Although the thermal history is similar, large differences in smectite to illite diagenesis were observed. (1) The boundaries between early/middle and middle/late diagenesis in two wells (Pichla, Radkersburg) and the Maribor area correspond to vitrinite reflectance values of 0.4-0.8 and 1.1-1.5% Rr. Anchimetamorphism starts at ~2.1% Rr. In spite of magmatic heating, the smectite to illite transformation can be modelled using kinetic data proposed for areas with a 'normal' burial diagenesis. (2) Smectite to illite reactions are advanced compared to vitrinite reflectance in the Ribnica-Selnica Trough. This is probably related to fluids with elevated K+ concentrations. (3) Clay mineral alterations lag behind coalification significantly in the Mitterlabilt well. These different correlations indicate that clay mineral thermometry should be used with caution and that factors other than temperature and time can influence clay mineral reactions.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 4 , December 1998 , pp. 523 - 537
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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