A series of ductile deformation evidences and large-scale tectonic
lines which remain enigmatic in the light of rigid tectonics principles were
observed around Zara and Bolucan areas in the Sivas basin. One group, the
evaporite walls which are closely related with the Oligocene-Lower Miocene
evaporitic levels, traverses the basin for 30-40 km in an approximate E-W
direction. Throughout the contacts, vertical to overturned evaporitic rocks
face with the younger sediments as well as with thrusts and folds. Evaporitic
diapirs of varying sizes, and basement and cover rock inclusions in the order
of several 100's meters to km constitute the smaller scale second set of
evidence of this kind of deformation. The available stratigraphic and tectonic
data lets us suggest that the ductile deformation occurred subsequent to the NS
compression. Also speculated, that the areal extension of the Oligocene-aged
Hafik gypsum is of utmost importance and the basaltic volcanism appeared in
late Miocene may well be a factor decreasing the viscosity of evaporites and hence
accelerating the phenomenon.
Primary Language | English |
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Subjects | Engineering |
Journal Section | Articles |
Authors | |
Publication Date | February 1, 1999 |
Published in Issue | Year 1999 Volume: 121 Issue: 121 |
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