 | | Journal (article/letter/editorial) | | at http://meteoritics.org Cooling of the Kärdla impact crater: I. The mineral paragenetic sequence observation...Institute of Geology, Vanemuise 46, Tartu 51014, Estonia *Corresponding author. E-mail: evelin.versh@ut...Abstract–The impact-induced hydrothermal system in the well-preserved, 4 km-diameter Kärdla impact crater on Hiiumaa...Hiiumaa Island, western Estonia, was investigated by means of mineralogical, chemical, and stable C and...evolutionary stages in the development of the post-impact hydrothermal system: 1) an early vapor-dominated |  | | Journal (article/letter/editorial) | | Saint Martin impact structure (Canada) – Unchaining the Late Triassic terrestrial impact craters Martin...Martin 40 Ar/39 Ar dating impact melting K-feldspar Triassic multiple impact event a b s t r a c t New...dating of impact-melted K-feldspars and impact melt rock from the ∼40 km Lake Saint Martin impact structure...melt aliquots and a minimum age for a wholerock impact melt sample. A combination of two plateau ages...for the impact. The concordant 40 Ar/39 Ar ages for the melted K-feldspars, derived from impact melt rocks |  | Tillberg, Mikael, Ivarsson, Magnus, Drake, Henrik, Whitehouse, Martin J., Kooijman, Ellen, Schmitt, Melanie (2019) Re-Evaluating the Age of Deep Biosphere Fossils in the Lockne Impact Structure. Geosciences, 9 (5) 202 doi:10.3390/geosciences9050202 | Journal (article/letter/editorial) | | the Age of Deep Biosphere Fossils in the Lockne Impact Structure Mikael Tillberg 1,2, *, Magnus Ivarsson...Published: 7 May 2019 Abstract: Impact-generated hydrothermal systems have been suggested...possibly beyond. Fossil evidence from a handful of impact craters worldwide have been used to support this...previously described fungal fossils from the Lockne crater (458 Ma), Sweden. Based on in-situ Rb/Sr dating...place at least 100 Myr after the impact event, thus long after the impact-induced hydrothermal activity |
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