Dating Terrestrial Impact Structures

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Dating Terrestrial Impact Structures | Elements . . .
(U‐Th)/He dating of terrestrial impact structures: The . . .
(U-Th)/He dating of terrestrial impact structures: The . . .
Dating terrestrial impact structures: U-Pb depth profiles . . .
(U-Th)/He dating of terrestrial impact structures: The . . .
(PDF) (U-Th)/He dating of single zircon and apatite . . .
Thermoluminescence dating of the Kamil impact crater (Egypt)
Dating Terrestrial Impact Structures
PDF Terrestrial Impact - USGS
Observations at terrestrial impact structures: Their . . .
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Dating Terrestrial Impact Structures . Fred Jourdan; Fred Jourdan . 1 . Western Australian Argon Isotope Facility, Department of Applied Geology & JdL Centre, Curtin University of Technology . , GPO Box U1987, Perth, WA 6845 . , Australia .
One promising isotopic technique for dating the majority of poorly dated or undated impact structures is based on the production of 4 He by radioactive decay of U, Th, and (to a much lesser extent) Sm isotopes . The (U-Th)/He method has been applied most commonly to the accessory phases zircon and apatite, and to a lesser extent titanite, all of which occur in many target rocks at terrestrial impact structures as igneous, metamorphic, or detrital grains .
title = "(U-Th)/He dating of terrestrial impact structures : The Manicouagan example", abstract = "The accurate dating of meteorite impact structures on Earth has proven to be challenging . Melt sheets are amenable to high-precision dating by the U-Pb and 40Ar/39Ar methods, but many impact events do not produce them, or they are not preserved .
Our results show that (U-Th)/He ages of zircon from the brecciated, and presumably shocked target, can accurately date an impact event and provides another tool to determine impact ages when no melt sheet exists, an alternative to problematic interpretations of commonly used apparent 40 Ar/ 39 Ar plateau ages . No evidence of epitaxial overgrowth rims and/or reset zircon was observed, suggesting that zircons within shocked impactites have remarkably slow Pb diffusion and possibly explaining . . .
The accurate dating of meteorite impact structures on Earth has proven to be challenging . Melt sheets are amenable to high-precision dating by the U-Pb and 40 Ar/ 39 Ar methods, but many impact events do not produce them, or they are not preserved . In cases where high-temperature shock metamorphism of the target materials has occurred without widespread melting, these isotopic chronometers may be partially reset and yield dates that are difficult to interpret unambiguously as the age of impact .
(U-Th)/He dating of single zircon and apatite crystals - A new tool for dating terrestrial impact structures January 2009 Conference: Lunar and Planetary Science Conference XL
The dating of terrestrial impact structures yields basic information on the meteorite and asteroidal flux onto Earth and, thus, on the related biological and environmental hazards . However, examination of discussions of dating of both large and old and recent and small impact structures indicates that age determinations can be problematic (Deutsch and
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The structures are divided into six categories, and their geographic locations are indicated on a sketch map . INTRODUCTION The compilation of a bibliography on terrestrial impact structures was prompted by an increasing interest in meteoritic impact as a factor in the geologic process and by the analogy of these structures
the term terrestrial impact structure to describe terrestrial impact craters, which is more generic and has no specific inference as to current topographic appearance . The known record is biased toward larger and geologically younger impact structures occurring on ge ologically stable areas, such as cratons . The knowledge base at any given terrestrial impact structure is highly variable and, in most cases, contains
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Dating Terrestrial Impact Structures