Cooling of the Kardla impact crater; 1, The mineral paragenetic sequence observation

  • Versh E
  • Kirsimae K
  • Joeleht A
 et al. 
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Abstract

The impact-induced hydrothermal system in the well-preserved, 4 km-diameter Kardla impact crater on Hiiumaa Island, western Estonia, was investigated by means of mineralogical, chemical, and stable C and O isotope studies. The mineralization paragenetic sequence, with gradually decreasing temperature, reveals at least three evolutionary stages in the development of the post-impact hydrothermal system: 1) an early vapor-dominated stage ({>}300 degrees C) with precipitation of submicroscopic adularia type K-feldspar; 2) the main stage (300 to 150/100 degrees C) with the development of a two-phase (vapor to liquid) zone leading to precipitation of chlorite/corrensite, (idiomorphic) euhedral K-feldspar, and quartz; and 3) a late liquid-dominated stage ({

Author-supplied keywords

  • 02A:General geochemistry
  • 05A:Igneous and metamorphic petrology
  • Baltic region
  • C-13/C-12
  • Estonia
  • Europe
  • Hiiumaa Island
  • Kardla Crater
  • Lower Silurian
  • O-18/O-16
  • Ordovician
  • Paleozoic
  • Silurian
  • Upper Ordovician
  • X-ray diffraction data
  • adularia
  • alkali feldspar
  • alteration
  • amphibole group
  • authigenic minerals
  • breccia
  • calcite
  • carbon
  • carbonates
  • chain silicates
  • chalcopyrite
  • chemical composition
  • chemically precipitated rocks
  • chlorite
  • chlorite group
  • clay minerals
  • clinoamphibole
  • cooling
  • cores
  • corrensite
  • dolomite
  • electron probe data
  • evaporation
  • evaporites
  • feldspar group
  • fluid inclusions
  • fractures
  • framework silicates
  • gaseous phase
  • geologic thermometry
  • geothermal systems
  • goethite
  • hematite
  • hornblende
  • hydrothermal alteration
  • impact craters
  • impact features
  • impactites
  • inclusions
  • isotope ratios
  • isotopes
  • liquid phase
  • mass spectra
  • metamorphic rocks
  • metamorphism
  • metasomatism
  • mineralization
  • models
  • oxides
  • oxygen
  • paragenesis
  • pressure
  • pyrite
  • quartz
  • sea water
  • sedimentary rocks
  • sheet silicates
  • shock metamorphism
  • silica minerals
  • silicates
  • spectra
  • stable isotopes
  • sulfides
  • temperature
  • thermal history
  • thermochronology
  • water vapor

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Authors

  • Evelin Versh

  • Kalle Kirsimae

  • Argo Joeleht

  • Juri Plado

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