Impacts in Precambrian Shields

ISBN-13: 9783540435174 / Angielski / Twarda / 2002 / 337 str.

Miroslaw J. Majewski; J. Plado; L. J. Pesonen

Opis

The present volume is the result of activities within the scientific programme "Response of the Earth System to Impact Processes" (IMP ACT) of the European Science Foundation (ESF). The ESF is an association of 67 national member organisations devoted to scientific research in 24 European countries. The IMPACT programme is aimed at understanding meteorite impact processes and their effects on the Earth System. Launched in 1998 for a duration of 5 years, the programme is now supported by 15 ESF membership countries. The programme of meteorite impact research and operates through deals with all aspects workshops, exchange programs, and short courses. The 4th IMPACT programme workshop "Meteorite Impacts in Precambrian Shields" took place on May 24-28, 2000, in Lappajarvi, western Finland. A total of 84 scientists from 19 countries from Europe, North America, and Africa participated in the workshop. During the workshop, 43 oral, 31 poster, and several video presentations were made. An exhibition of impactite rocks from Finnish craters and two excursions were organised. The excursion to impact melt rock outcrops of the Lappajarvi structure took place during the workshop. The Karikkoselka and Saaksjarvi impact structures in south-central Finland were visited during the post-meeting excursion.

Spis treści

The Impact Cratering Record of Fennoscandia — A New Look at the Database.- Re-examining Structural Data from Impact Craters on the Canadian Shield in the Light of Theoretical Models.- Popigai Crater: General Geology.- Geophysics and Petrophysics of the Popigai Impact Structure, Siberia.- U-Pb Analyses of Zircons from the Popigai Impact Structure, Russia: First Results.- Impact-Generated Hydrothermal Systems: Data from Popigai, Kara, and Puchezh-Katunki Impact Structures.- Geology and Petrography of the Zapadnaya Impact Crater in the Ukrainian Shield.- Bosumtwi Impact Crater, Ghana: A Remote Sensing Investigation.- Geochemistry of Soils from the Bosumtwi Impact Structure, Ghana, and Relationship to Radiometric Airborne Geophysical Data.- Tektite Origin in Oblique Impacts: Numerical Modeling of the Initial Stage.- Geology and Magnetic Signatures of the Neugrund Impact Structure, Estonia.- Natural Resources of the Kärdla Impact Structure, Hiiumaa Island, Estonia.- Seismic Correlation of the Mjølnir Marine Impact Crater to Shallow Boreholes.- Numerical Modeling of Impacts into Shallow Sea.

Blurb

This multiauthor book is a compilation of fourteen papers that result from activities within the scientific programme "Response of the Earth System to Impact Processes" (IMPACT) of the European Science Foundation. The program deals with all aspects of meteorite impact research and operates through workshops, exchange programs and short courses. Most of the papers are initiated from the 4th IMPACT workshop "Meteorite Impacts in Precambrian Shields" that took place in Lappajärvi, Finland, in 2000. The volume begins with a detailed view of thirty confirmed meteorite impact structures found in the Fennoscandian Shield and its nearest surroundings. The following papers describe impact structures in different areas.