 | PUURA, V., HUBER, H., KIRS, J., KÄRKI, A., SUUROJA, K., KIRSIMÄE, K., KIVISILLA, J., KLEESMENT, A., KONSA, M., PREEDEN, U., SUUROJA, S., KOEBERL, C. (2004) Geology, petrography, shock petrography, and geochemistry of impactites and target rocks from the Kärdla crater, Estonia. Meteoritics & Planetary Science, 39 (3) 425-451 doi:10.1111/j.1945-5100.2004.tb00103.x | Journal (article/letter/editorial) | | of impactites and target rocks from the Kärdla crater, Estonia V. PUURA,1* H. HUBER,2† J. KIRS,1 A. KÄRKI...University of Tartu, Vanemuise street 46, 51014 Tartu, Estonia of Geological Sciences, University of Vienna, Althanstrasse...Finland 4Geological Survey of Estonia, Kadaka tee 80/82, 12618 Tallinn, Estonia 5Institute of Geology, Tallinn...Tallinn Technical University, Estonia pst. 7, 10143 Tallinn, Estonia †Present address: Institute of Geophysics...Abstract–The Kärdla crater is a 4 km-wide impact structure of Late Ordovician age located on Hiiumaa Island, Estonia |  | PETERSEN, Michael T., NEWSOM, Horton E., NELSON, Melissa J., MOORE, Duane M. (2007) Hydrothermal alteration in the Bosumtwi impact structure: Evidence from 2M1-muscovite, alteration veins, and fracture fillings. Meteoritics & Planetary Science, 42 (4) 655-666 doi:10.1111/j.1945-5100.2007.tb01066.x | Journal (article/letter/editorial) | | http://meteoritics.org Hydrothermal alteration in the Bosumtwi impact structure: Evidence from 2M1-muscovite, alteration... Abstract–Drill-core samples from the Bosumtwi impact structure (1.07 Myr old and 10.5 km in diameter)...in Ghana exhibit mineralogical evidence for post-impact hydrothermal alteration. Nine samples of drill...are rich in 2M1-muscovite, consistent with post-impact fluid deposition and alteration. Optical analysis...analysis indicates the presence of a pre-impact stratiform chlorite in meta-graywacke samples and a secondary |  | Simpson, S.L., Osinski, G.R., Longstaffe, F.J., Schmieder, M., Kring, D.A. (2020) Hydrothermal alteration associated with the Chicxulub impact crater upper peak-ring breccias. Earth and Planetary Science Letters, 547. 116425pp. doi:10.1016/j.epsl.2020.116425 | Journal (article/letter/editorial) | | Hydrothermal alteration associated with the Chicxulub impact crater upper peak-ring breccias S.L. Simpson a,∗ ,...McKinnon Keywords: Chicxulub impact impact generated hydrothermal systems impact cratering astrobiology a...a b s t r a c t The 66 Ma, ∼180 km Chicxulub impact structure in the northern Yucatán peninsula and southern...Gulf of Mexico is the best-preserved large impact crater on Earth with a well-developed peak ring. The...upwards): crystalline basement granitoid rocks (Unit 4); a thin layer of impact melt rocks (Units 3A and B); |  | | Journal (article/letter/editorial) | | apatite, titanite and zircon from the Lac La Moinerie impact structure, Canada Maree McGregor1,2 · Christopher...zircon from the ~ 8-km-diameter Lac La Moinerie impact structure, Canada. The three analyzed phases are...that were transformed to impact melt-bearing breccias and clast-laden impact melts. Apatite yields an...Paleoproterozoic igneous–metamorphic events in granitoid target rocks of the De Pas Suite. Isotopic resetting...was controlled by a combination of proximity to impact-generated superheated melt and the formation of |  | 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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