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Carbonates, Pedogenic (U-Series)
U-Th dating of striated fault planes - CORE
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. Using U-Th dating of samples from three adjacent fault planes, we delineate four welldefined deformation ages in the period from 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.
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Dating coseismic calcite ; Dating fault-related precipitate ; Paleoseismicity ; U—Th geochronology of syn-tectonic calcite. The use of U-series geochronology applied to fault-related calcite for dating brittle fault activity. Absolute time constraints on fault activity are an essential part of many plate tectonic and paleoseismic studies, and their potential interpretation in terms of fault seismicity and seismic hazards is well recognized e.
Pedogenic carbonate, if less than about 0. Such dates can provide useful estimates of the depositional age of the host rock and a time axis for paleoclimate proxy records contained in the carbonate itself. Skip to main content Skip to table of contents.