Leho Ainsaar, Kalle Suuroja, Maili Semidor,
Kärdla impact crater, 4 km in diameter, was formed in the early Caradoc (Late Ordovician) in the ... Upper Ordovician post-impact sediments that cover the Kärdla crater are 15–275 m thick. The crater ... shoal areas in Estonian mainland and in the Kärdla rim dates the climatic change in the basin ... lasted about 11 million years, infilling of the Kärdla crater required about 7 million years, and influence ... for this extraordinary long influence of crater. The Kärdla crater is an example of the astrobleme, formed ...
Tópico(s): Methane Hydrates and Related Phenomena
2002 - Elsevier BV | Deep Sea Research Part II Topical Studies in Oceanography
Kalle Kirsimäe, Sten Suuroja, Juho Kirs, Aulis Kärki, Maile Polikarpus, V. Puura, Kalle Suuroja,
Abstract— The well‐preserved Kärdla impact crater, on Hiiumaa Island, Estonia, is a 4 km diameter structure formed in a shallow Ordovician sea ˜455 Ma ... breccia. The rather low salinity of fluids in Kärdla crater (<13 wt% NaCl eq ) suggests that the ... crystalline basement. The well‐developed hydrothermal system in Kärdla crater shows that the thermal history of the ...
Tópico(s): Geology and Paleoclimatology Research
2002 - Wiley | Meteoritics and Planetary Science
Jüri Plado, L. J. Pesonen, S. Elo, V. Puura, Kalle Suuroja,
... 4 km wide and 500 m deep circular Kärdla impact structure in Hiiumaa Island, Estonia, of middle ... centre are consistent with an impact origin for Kärdla. As in many other impact structures, the magnetization ... A new geophysical and geological model of the Kärdla structure is presented based on geophysical field measurements ...
Tópico(s): Geology and Paleoclimatology Research
1996 - Wiley | Meteoritics and Planetary Science
The about 455 Ma (Late Ordovician, Caradoc period) Kärdla impact structure on Hiiumaa Island, Estonia (58°59´ ... Several natural resources are spatially related to the Kärdla structure: 1) at the rim wall crystalline building ...
Tópico(s): Astro and Planetary Science
2002 - Springer Nature | Impact studies
E. Versh, Kalle Kirsimäe, Argo Jõeleht,
... modeling was verified against the 4-km diameter Kärdla complex structure, Hiiumaa Island, Estonia. If there is ... transient fluid flow and heat transfer simulations in Kärdla suggest that immediately after impact the temperatures in ...
Tópico(s): Astro and Planetary Science
2006 - Elsevier BV | Planetary and Space Science
Argo Jõeleht, Kalle Kirsimäe, Jüri Plado, E. Versh, B. A. Ivanov,
... in a 4 km marine complex crater at Kärdla, Estonia. The impact modeling was used to simulate ...
Tópico(s): High-pressure geophysics and materials
2005 - Wiley | Meteoritics and Planetary Science
E. Versh, Kalle Kirsimäe, Argo Jõeleht, Jüri Plado,
... system in the well‐preserved, 4 km‐diameter Kärdla impact crater on Hiiumaa Island, western Estonia, was ...
Tópico(s): Geology and Paleoclimatology Research
2005 - Wiley | Meteoritics and Planetary Science
Roger Törnberg, Erik Sturkell,
... on land. Another marine-target structure, the Estonian Kärdla structure, demonstrates intermediate contrast in impact breccia and ... the interpreted shallowness of the sea at the Kärdla impact site. We conclude that the main cause ...
Tópico(s): Geology and Paleoclimatology Research
2005 - Wiley | Meteoritics and Planetary Science
V. Puura, Heinz Huber, Juho Kirs, Aulis Kärki, Kalle Suuroja, Kalle Kirsimäe, J. Kivisilla, A Kleesment, M. Konsa, Ulla Preeden, Sten Suuroja, Christian Koeberl,
Abstract— The Kärdla crater is a 4 km‐wide impact structure of Late Ordovician age located on Hiiumaa Island, Estonia. The ...
Tópico(s): Geochemistry and Elemental Analysis
2004 - Wiley | Meteoritics and Planetary Science
Kalle Suuroja, Sten Suuroja, Tarmo All, Tom Flodén,
The Kärdla marine impact structure (Estonia, 58°58′N, 22°46′E) was formed at 455 Ma (Upper Ordovician), ...
Tópico(s): Geology and Paleoclimatology Research
2002 - Elsevier BV | Deep Sea Research Part II Topical Studies in Oceanography
The buried and well preserved Kärdla crater in Estonia (Southern Fennoscandia) (58°59Ń, 22°40É), with a diameter of approximately 4 km, was discovered in 1967. The ...
Tópico(s): Paleontology and Stratigraphy of Fossils
1992 - Elsevier BV | Tectonophysics
Abdus Samad Azad, Henning Dypvik, E. Kalleson,
... impact structure with the processes discussed from Gardnos, Kardla, Lockne and Chesapeake Bay marine impact structures. Sedimentary ... targets resulted in relatively weaker rim formation in Kardla. The related brim developments in the Lockne and ... debris flows. Resurge turbidites are observed in the Kardla and Lockne crater infilling successions. Turbidites in the ...
Tópico(s): Astro and Planetary Science
2015 - Elsevier BV | Sedimentary Geology
Kalev Adamson, Rein Drenkhan, M. Hanso,
... the Botanic Garden, northern Estonia), in Tori and Kärdla (western Estonia), in Vasula and Kärevere (east-central ...
Tópico(s): Mycorrhizal Fungi and Plant Interactions
2015 - Taylor & Francis | Scandinavian Journal of Forest Research
Abstract– Three structures (Neugrund, Kärdla, and Kaali) of proven impact origin make Estonia the most cratered country in the world by area. In addition, several ...
Tópico(s): Geology and Paleoclimatology Research
2012 - Wiley | Meteoritics and Planetary Science
... Neugrund Impact Structure, Estonia.- Natural Resources of the Kardla Impact Structure, Hiiumaa Island, Estonia.- Seismic Correlation of ...
Tópico(s): Geological Studies and Exploration
2002 - Springer Nature | Impact studies
Sten Suuroja, Tarmo All, Jüri Plado, Kalle Suuroja,
... impact structures of the Fennoscandian shield (e.g., Kärdla, Lappajärvi, Lockne) suggest that the maximum depth of ...
Tópico(s): Geology and Paleoclimatology Research
2002 - Springer Nature | Impact studies
Yngve Grahn, Jaak Nõlvak, Florentin Paris,
... craters has been investigated. Three of these (Tvären, Kärdla and Lockne) contain complete sequences of early Caradoc ...
Tópico(s): Marine Biology and Ecology Research
1996 - Copernicus Publications | Journal of Micropalaeontology
... in these craters have been investigated. Three craters (Kärdla, Tvären and Lockne) were created at different occasions ...
Tópico(s): Astro and Planetary Science
1993 - Taylor & Francis | Geologiska Foereningan i Stockholm Foerhandlingar
Tom Flodén, Maurits Lindström, V. Puura, Kalle Suuroja,
Comparisons of crater infill of the Middle Ordovician (Idavere) impact craters of Kirdla (NW Estonia), Tvidren (SE central Sweden), and Lockne (NW central Swe- den) have shed new light on asteroid impact events in epicontinental seas, calling also for new diversified terminology.The three craters are interpreted as having resulted from an asteroid swarm that hit Baltica in the early Idavere time.The infilling of the 4 km wide Kéirdla crater is used as type section.The Kairdla asteroid hit an area of ...
1992 - Estonian Academy Publishers | Proceedings of the Estonian Academy of Sciences Geology
T Kallaste, Juha A. Karhu, A Kleesment, M. Konsa, Ulla Preeden, V. Puura,
... was studied in five boreholes drilled around the Kärdla impact meteorite structure.Quartz grains with planar deformation ...
Tópico(s): Geology and Paleoclimatology Research
2006 - Estonian Academy Publishers | Proceedings of the Estonian Academy of Sciences Geology
Sten Suuroja, K. Suuroja, Tom Flodén,
Kärdla and Neugrund are two Early Palaeozoic offshore impact structures located some 50 km apart along the ... similarities but differing features are also found.The Kärdla impact structure is located at the NE coast ...
Tópico(s): Geology and Paleoclimatology Research
2013 - Geological Society of Finland | Bulletin of the Geological Society of Finland
... sedimentology as exemplified by the Lockne, Tvären and Kärdla structures." GFF, 118(S4), p. 103
Tópico(s): Methane Hydrates and Related Phenomena
1996 - Taylor & Francis | GFF
A Kleesment, M. Konsa, V. Puura,
Immersion analysis with the polarizing microscope and SEM studies revealed fracturing in zircon and garnet grains from impact breccias of the Kirdla crater.The zircon grains showed impact-related features, including widening of pre-existing fractures in the internal zones, some fresh fractures, loss of inclusions, decrease in transparency, increase in turbidity, and the intensely cracked outermost coat in zoned zircons.The garnet grains were intensely fractured only in the uppermost subcrater basement, ...
Tópico(s): Plant Ecology and Soil Science
2000 - Estonian Academy Publishers | Proceedings of the Estonian Academy of Sciences Geology
Andrew Y. Glikson, Franco Pirajno,
... Kamm (Namibia), Manson (USA), the above-mentioned Vredefort, Kärdla (Estonia), Sudbury and Haughton (Canada) structures (Newsom et ... K-feldspar in granitoids and amphibolites at the Kärdla crater, Estonia. In: Gilmour I, Koeberl C (eds) ... K-enriched impactites, based on drillings into the Kärdla Crater, Estonia. Geol Soc Am Abs with Programs, ...
Tópico(s): Geology and Paleoclimatology Research
2018 - Springer Nature (Netherlands) | Modern approaches in solid earth sciences
Ricardo Andrés Costantini, Juan Manuel Telayna, Cristian S. García,
... impact structure with the processes discussed from Gardnos, Kärdla, Lockne and Chesapeake Bay marine impact structures. Sedimentary ... targets resulted in relatively weaker rim formation in Kärdla. The related brim developments in the Lockne and ... debris flows. Resurge turbidites are observed in the Kärdla and Lockne crater infilling successions. Turbidites in the ...
Tópico(s): Coronary Interventions and Diagnostics
2014 - Elsevier BV | Global Heart