Formation of fault-related calcite precipitates and their implications for dating fault activity in the east Anatolian and dead sea fault zones

P. Nuriel, G. Rosenbaum, T. I. Uysal, J. Zhao, S. D. Golding, R. Weinberger, V. Karabacak, Y. Avni

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Fault-related calcite precipitates taken from different segments along the East Anatolian (SE Turkey) and Dead Sea (Israel) fault zones were investigated structurally, geochemically and geochronologically. The results indicate major differences in the nature of calcite precipitates and temporal relationship to faulting. In the Düziçi Fault, calcite-filled veins and hydraulic fractures precipitated co-seismically during three consecutive faulting events. Calcite precipitated in veins at the Har Zefiyya Fault was controlled by near-surface karst processes. Initial opening of the veins occurred prior to about 500 ka and may represent the onset of an east-west contractional deformation. In the Carmel Fault Zone the calcite coating the fault plane precipitated by karst processes, with no evidence of subsequent deformation. Calcite fault gouge from the same site are a mix of host-rock gouge and newly formed authigenic calcite, and their overall geochemistry suggests pervasive fluid-rock interaction in the fault zone. In the Baraq Fault Zone the precipitation of calcite within syntectonic tension gashes and veins occurred prior to 540 ka by the pervasive infiltration of meteoric water into the fault zone. The results demonstrate that geochemical and structural analyses, combined with U-Th geochronology, can shed light on co-seismic and interseismic fault activity, and can potentially provide precise age constraints on the timing of brittle deformation.

Original languageEnglish
Pages (from-to)229-248
Number of pages20
JournalGeological Society Special Publication
Volume359
Issue number1
DOIs
StatePublished - 26 Dec 2011
Externally publishedYes

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