Impact structures as indicators of cratonic denudation
Hietala, S.; Hall, A. M.; Putkinen, N.; Lindsberg, E.; Holma, M. (2021-05-31)
Hietala, S.; Hall, A. M.; Putkinen, N.; Lindsberg, E.; Holma, M. (2021) Impact structures as indicators of cratonic denudation. In: Ilmo Kukkonen et al. Lithosphere 2021 : Eleventh symposium on structure, composition and evolution of the lithosphere. Programme and extended abstracts, (pp. 27-30), Report S-71, University of Helsinki. https://www.seismo.helsinki.fi/ilp/lito2021/Lithosphere_2021_Symposium_Abstract_Volume.pdf
© 2021 The Authors.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2021053132347
Tiivistelmä
Abstract
Meteorite impact structures can provide important information on long-term denudation on the Earth’s cratons. Impact structures in the Fennoscandian Shield contain rocks (i.e., impactites), that have developed during the collision, and, possibly, remnants of the pre-impact sedimentary rocks. The crater depressions may also be filled with post-impact sediments. Sedimentary deposits in impact structures have not been much utilized before in studying the erosion-burial history of the Fennoscandian craton. Here, we use published data on meteorite impact structures to reconstruct the depth of erosion in southern Finland and neighboring platform areas. Post-impact erosion depths were estimated using an empirical relationship derived from well-preserved impact structures. Results support ultra-slow erosion of the basement and sedimentary cover continuing over hundreds of millions of years.
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