My PhD project is focused on the development and application of different radiometric dating techniques on impact structures. Impact structures are formed by one of the most spectacular and fastest surface-modifying process on Earth, which can change the geo- and biosphere in a couple of seconds. Unfortunately the ages of many craters are not well-constrained or unknown. This is largely attributable to the lack of suitable dating material due to erosion, post-impact alteration, thermal overprinting, and contamination. Impact-generated shock waves are able to reset different isotopic systems, i. Biotite, amphiboles and zircon are to be investigated to see if the shock waves can induce a reset of the isotopic systems of the different mineral phases and if there is a correlation between the ages and different shock pressure levels.
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Gör en mer avancerad sökning ». Författare: Bryan Lougheed ; Lunds Universitet. Sammanfattning: The Baltic Sea is a continental shelf sea that is influenced by both river runoff and marine water. The two water masses are vertically stratified in the Baltic Sea, resulting in a positive, estuarine circulation system, which has undergone changes in the past due to isostatic uplift of the Baltic basin. For researchers to understand past changes in the marine environment of the Baltic Sea, a sound geochronology is of utmost importance.
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