Dating Terrestrial Impact Structures
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Hypervelocity impacts of asteroids and comets have played a key role in the evolution of the Solar System and planet Earth. Geochronology, the science that investigates the ages of rocks, has become a preponderant tool for dating impact events and for assessing whether they are related in time to mass extinctions on Earth. Impact events are instantaneous compared to other geological processes and, in theory, represent easy targets for multitechnique geochronology. Yet, only a few terrestrial impact events are accurately and precisely dated. A dating campaign is urgently needed if we are to fully understand the role of impacts in Earth history.
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Jourdan, Fred (2012)The 40Ar/39Ar technique is a powerful geochronological method derived from the K/Ar technique that can help to unravel the evolution of the solar system. The 40Ar/39Ar system can not only record the timing of volcanic and ...
A new ~3.46 Ga asteroid impact ejecta unit at Marble Bar, Pilbara Craton, Western Australia: A petrological, microprobe and laser ablation ICPMS studyGlikson, A.; Hickman, A.; Evans, Noreen; Kirkland, Chris; Park, J.; Rapp, R.; Romano, S. (2016)The Archean rock record contains seventeen asteroid impact ejecta units that represent the terrestrial vestiges of an extended late heavy bombardment (LHB). Correlated impact ejecta units include 3472–3470 Ma impact ...
The Lappajärvi impact structure (Finland): Age, duration of crater cooling, and implications for early lifeJourdan, Fred; Schmieder, M. (2013)An in-depth approach of 40Ar/39Ar dating of the ~23 km Lappajärvi impact structure (Finland) was performed using carefully selected single-grain aliquots of optically fresh, clast-poor, impact melt rock and recrystallized ...