 | | 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 |  | JÕELEHT, Argo, KIRSIMÄE, Kalle, PLADO, Jüri, VERSH, Evelin, IVANOV, Boris (2005) Cooling of the Kärdla impact crater: II. Impact and geothermal modeling. Meteoritics & Planetary Science, 40 (1) 21-33 doi:10.1111/j.1945-5100.2005.tb00362.x | Journal (article/letter/editorial) | | http://meteoritics.org Cooling of the K‰rdla impact crater: II. Impact and geothermal modeling Argo JÕELEHT1...University of Tartu, Vanemuise 46, Tartu 51014, Estonia of Dynamics of Geospheres, Russian Academy of Sciences...2004; revision accepted 8 December 2004) Abstract–Impact and geothermal modeling was performed to explain...alteration in a 4 km marine complex crater at K‰rdla, Estonia. The impact modeling was used to simulate the...the formation of the crater and the post-impact temperature distribution in crater environment. The geothermal |  | 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) | | from the Kärdla crater, Estonia V. PUURA,1* H. HUBER,2† J. KIRS,1 A. KÄRKI,3 K. SUUROJA,4 K. KIRSIMÄE...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 |  | | Journal (article/letter/editorial) | | http://meteoritics.org Post-impact alteration of surficial suevites in Ries crater, Germany: Hydrothermal...University of Tartu, 46 Vanemuise St., Tartu, 51014, Estonia of Earth Sciences/Physics and Astronomy, University...Abstract–Alteration of surficial suevites at Ries crater, Germany was studied by means of X-ray diffraction...been previously interpreted as resulting from post-impact hydrothermal processes. The results of this study...hydrothermally modified during the early stages of post-impact cooling, then the alteration was of limited character |  | | Journal (article/letter/editorial) | | composition of smectite in suevites at the Ries crater, Germany: Implications for hydrous alteration of...University of Tartu, Ravila 14A, 50411 Tartu, Estonia Institute of Mineralogy and Geochemistry, University...September 2010 Editor: L. Stixrude Keywords: Ries crater suevite stable isotope composition smectite fluid...t The 24-km diameter Ries crater, Germany, exhibits well-preserved crater filling and surficial melt-rich...been altered by post-impact hydrothermal fluids. The alteration mineralogy of the crater filling breccias is |  | 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...layer of impact melt rocks (Units 3A and B); melt-bearing breccias (Units 2A–C); and post-impact sedimentary |  | | Journal (article/letter/editorial) | | Canadian Mineralogist Vol. 43, pp. 553-567 (2005) IMPACT-RELATED Ca-METASOMATISM IN CRYSTALLINE TARGET-ROCKS...target-rocks from the 54-kmdiameter Charlevoix impact structure, in eastern Quebec, have been investigated...cooling. The Ca-metasomatic event occurred after the impact because it affected already shocked rocks and because...the Ca-rich zones to the impact structure suggest that the metasomatism is impact-related. Thermal energy...would have come from a combination of overlying impact-melt sheet and fallback, central uplift elevation |  | | Journal (article/letter/editorial) | | online at http://meteoritics.org Impact melt rocks from the Paasselkä impact structure (SE Finland): Petrography...melt rocks from the ∼10 km and ≤1.9 Ga Paasselkä impact structure, SE Finland, were obtained. In this study...clast-rich Paasselkä impact melt rocks. Shock metamorphic features comprise shocked feldspar grains, intensely...quartz glass, largely fresh and recrystallized feldspar glasses, decomposed biotite flakes, recrystallized...different monomineralic and mixed-mineral melts). Feldspar glasses and the fresh glassy to cryptocrystalline |  | | 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...isochron ages for the K-feldspar melt aliquots and a minimum age for a wholerock impact melt sample. A combination...for the impact. The concordant 40 Ar/39 Ar ages for the melted K-feldspars, derived from impact melt rocks |  | | Journal (article/letter/editorial) | | http://meteoritics.org Fluid inclusion evidence for impact-related hydrothermal fluid and hydrocarbon migration...Yaxcopoil-1 (Yax-1) have revealed compelling evidence for impact-induced hydrothermal alteration. Fluid circulation...derive from cracking of pre-impact organic matter. The center of the crater is assumed to be the source...convection of local pore fluids, possibly triggered by impact-induced conductive heating of the sediments. INTRODUCTION...to cause hydrothermal fluid circulation in the crater fill and surrounding rocks due to the release of |  | | Journal (article/letter/editorial) | | Numerical modeling of impact-induced hydrothermal activity at the Chicxulub crater Oleg ABRAMOV†* and David...2006) Abstract–Large impact events like the one that formed the Chicxulub crater deliver significant amounts...activity. We report on numerical modeling of Chicxulub crater cooling with and without the presence of water...the hydrothermal activity to the center of the crater. The temperatures and fluxes of fluid and vapor...dominant mechanism of heat transport in most of the crater, and significant amounts of heat being delivered |  | 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...Lockne crater (458 Ma), Sweden. Based on in-situ Rb/Sr dating of secondary calcite-albite-feldspar (356...place at least 100 Myr after the impact event, thus long after the impact-induced hydrothermal activity |  | | Journal (article/letter/editorial) | | importance of being cratered: The new role of meteorite impact as a normal geological process Bevan M. FRENCH...past development of impact geology and of the newly recognized importance of impact events in terrestrial...range of impact effects preserved on the Earth, to apply the knowledge obtained from impact phenomena...exotic field of impact geology with mainstream geosciences. Since the recognition of an impact event at the...the Cretaceous-Tertiary (K-T) boundary, much current activity in impact geology has been promoted by traditionally |
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