Timing and conditions of clay fault gouge formation on the Naxos detachment (Cyclades, Greece)
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Date
2016-10
Publication Type
Journal Article
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yes
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Abstract
Clay fault gouge from the Naxos detachment (locally up to 1.0–1.5 m thick) is reported and dated for the first time. K-Ar ages on eight clay size fractions from the detachment and a minor fault in the immediate footwall have a narrow range, from 10.3 to 9.0 Ma, with an average of 9.7 ± 0.5 Ma (±1σ). These results are in excellent accord with regional and local age constraints, independently demonstrating the reliability of the method. Hydrogen δD values fall in the range −89 to −95‰, indicating interaction with infiltrating meteoric water during gouge formation, which is consistent with deposition of freshwater sediments in the hanging wall at the same time. Clay mineralogy in the detachment gouge is predominantly mixed layer illite-smectite with subordinate 1 M illite and kaolinite but without higher-temperature 2 M1 illite/mica. Clay fault gouge predominantly formed over a limited time and temperature range, potentially acting as a weak lubricant promoting movement on the Naxos detachment, with correspondingly rapid exhumation and cooling of the underlying footwall.
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published
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Journal / series
Volume
35 (10)
Pages / Article No.
2334 - 2344
Publisher
American Geophysical Union
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Date created
Subject
Aegean; Clay fault gouge; Dating; Detachment; Hydrogen isotopes
Organisational unit
03392 - Burg, Jean-Pierre (emeritus)