Avike bay - a 10 km diameter possible impact structure at the Bothnian Sea coast of central Sweden.
2005 (English)In: IMPACT TECTONICS / [ed] Koeberl, C; Henkel, H, 2005, 323-340 p.Conference paper (Refereed)
Avike Bay is a 270 degrees degree wide near-circular, 114 in deep bay on the Swedish coast of the Bothnian Sea, northeast of Sundsvall. The structure has a diameter of about 10 km. It was classified as a probable impact structure because of its extraordinary circular topography in the overwiew of impact structures in Fennoscandia. Recent studies lend further support to this interpretation. The structure has a submarine central mound, which is elevated some 40 in above the adjacent sea floor. It has a very distinct tangential and radial on-shore fracture pattern as seen in the topographic map. Along the southwestern shore of the Bay, an enigmatic quartzite breccia of unknown age occurs as part of a larger outcrop of polymict breccia with clasts of crystalline rocks and quartzite of unknown age. In thin section, planar fractures can be observed in quartz and feldspar grains. A detailed investigation showed that in a few cases the quartz grains contained microdeformation features closely resembling PDFs.
Place, publisher, year, edition, pages
2005. 323-340 p.
, IMPACT STUDIES
IdentifiersURN: urn:nbn:se:kth:diva-42789DOI: 10.1007/3-540-27548-7_12ISI: 000229304500012ISBN: 3-540-24181-7OAI: oai:DiVA.org:kth-42789DiVA: diva2:447706
8th International Meeting on Response of the Earth System to Impact Processes (IMPACT) Location: Mora, SWEDEN Date: MAY 31-JUN 03, 2002
QC 201110132011-10-132011-10-122011-10-13Bibliographically approved