Clay mineralogical and isotopic (K-Ar, delta O-18, delta D) constraints on the evolution of the North Anatolian Fault Zone, Turkey

Uysal, I. T., Mutlu, H., Altunel, E., Karabacak, V. and Golding, S. D. (2006) Clay mineralogical and isotopic (K-Ar, delta O-18, delta D) constraints on the evolution of the North Anatolian Fault Zone, Turkey. Earth and Planetary Science Letters, 243 1-2: 181-194. doi:10.1016/j.epsl.2005.12.025


Author Uysal, I. T.
Mutlu, H.
Altunel, E.
Karabacak, V.
Golding, S. D.
Title Clay mineralogical and isotopic (K-Ar, delta O-18, delta D) constraints on the evolution of the North Anatolian Fault Zone, Turkey
Journal name Earth and Planetary Science Letters   Check publisher's open access policy
ISSN 0012-821X
Publication date 2006
Sub-type Article (original research)
DOI 10.1016/j.epsl.2005.12.025
Volume 243
Issue 1-2
Start page 181
End page 194
Total pages 14
Editor H. Elderfield
V. Courtillot
Place of publication Netherlands
Publisher Elsevier BV
Collection year 2006
Language eng
Subject C1
040203 Isotope Geochemistry
040303 Geochronology
0402 Geochemistry
Abstract This study presents the first attempt to constrain the evolution of the North Anatolian Fault Zone (NAFZ) by age dating and isotope tracing of clay minerals formed during near-surface faulting. Extensive illitic clay mineralisation occurred along the NAFZ related to hydrothermal alteration of the fault gouges and pseudotachylytes. Samples representing the pre-fault protoliths outside the fault zone do not contain authigenic illitic clay minerals indicating that hydrothermal processes were confined to the areas within the fault zone. K-Ar age data indicate that the hydrothermal system and the associated illite authigenesis initiated at similar to 57 Ma. This process is interpreted to reflect the onset of significant strike-slip or transtensional faulting immediately after the continental collision related to the closure of the Neotethys Ocean. Following the initiation of the fault movements in the latest Paleocene-Early Eocene, displacements along the NAFZ have continued, with probably intensified fault activities at similar to 26 Ma and later than similar to 8 Ma. Oxygen isotope compositions of the illitic clays from different locations along the NAFZ are similar, with narrow ranges in delta O-18 values indicating clay precipitation from fluids with similar oxygen isotope compositions and crystallisation temperatures. The delta O-18 and delta D values of the calculated fluid isotopic composition (delta O-18=5.9 parts per thousand to 11.2 parts per thousand, delta D=-59 parts per thousand to -73 parts per thousand) are consistent with metamorphic and magmatic origin of fluids mobilised during active tectonism. The interpretation of the fluid flow history of the NAFZ is in agreement with that reported previously for some well-known large-scale high-angle fault zones, which similarly developed along collisional-type orogenic belts and are commonly associated with significant mesothermal ore mineralisation. (c) 2005 Elsevier B.V. All rights reserved.
Keyword Geochemistry & Geophysics
North Anatolian Fault Zone
Illitic Clay Minerals
Hydrothermal
K-ar Dating
Delta O-18 And Delta D
Fluid Flow
Permian Coal Measures
Bowen Basin
Alpine Fault
New-zealand
Illite
Earthquake
Australia
Slip
Geochemistry
Queensland
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 10:48:22 EST