U-Th dating of striated fault planes

Nuriel, Perach, Rosenbaum, Gideon, Zhao, Jian-Xin, Feng, Yuexing, Golding, Suzanne D., Villemant, Benoît and Weinberger, Ram (2012) U-Th dating of striated fault planes. Geology, 40 7: 647-650.


Author Nuriel, Perach
Rosenbaum, Gideon
Zhao, Jian-Xin
Feng, Yuexing
Golding, Suzanne D.
Villemant, Benoît
Weinberger, Ram
Title U-Th dating of striated fault planes
Journal name Geology   Check publisher's open access policy
ISSN 0091-7613
Publication date 2012-07
Sub-type Article (original research)
DOI 10.1130/G32970.1
Volume 40
Issue 7
Start page 647
End page 650
Total pages 4
Place of publication Boulder, CO, United States
Publisher Geological Society of America
Collection year 2013
Language eng
Abstract Direct dating of brittle fault activity is of fundamental importance to tectonic reconstructions and paleoseismic studies. One way to address this issue is by constraining the timing of fault striations, but this requires a better understanding of the striation formation mechanism and associated mineralization. We present results from a microstructural, geochemical, and geochronological study of calcite precipitates associated with striated fault planes from the Dead Sea fault zone in northern Israel. We recognize four types of coexisting calcite precipitates, including calcite cement in dilation breccia, calcite in striated groove morphology, calcite gouge associated with hydraulic fracturing and pressure solution, and calcite coating of the fault surface. Carbon-oxygen isotopes, 87Sr/86Sr ratios, and rare earth element and yttrium (REY) patterns indicate various precipitation mechanisms associated with formation of syntectonic (calcite cement and striations), coseismic (calcite gouge), and interseismic (calcite coating) precipitates in the fault zone. Using U-Th dating of samples from three adjacent fault planes, we delineate four welldefined deformation ages in the period from 220 to 60 ka. We conclude that these ages constrain the timing of activity along the Dead Sea fault zone in northern Israel, and argue that a similar methodological approach could potentially shed light on the timing of deformation in other brittle fault zones.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes First published online: 27 April 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2013 Collection
Centre for Microscopy and Microanalysis Publications
 
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