Impact craters and craterform structures in Fennoscandia.

Details Impact craters and craterform structures in Fennoscandia. Impact craters and craterform structures in Fennoscandia.

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tectp.216...31h&link_type=abstract

Tectonophysics, Vol. 216, No. 1/2, p. 31 - 40

Physics

11

Scientific paper

Sixty-two, nearly circular, topographic, morphological or geophysical structures in Fennoscandia and Estonia were studied to discover their origin. The structures were divided into five classes. Fifteen were caused by meteorite impacts (class A and a). The age of the recognized impact craters varies from pre-historic (3500 B.C.) to 700 Ma and their diameters from 0.04 km to 55 km. The majority of the other structures are probable (class B) or possible (class C) craters for which there is not yet sufficient proof of impact origin. There is increasing evidence that some of the large arcuate morphological or geophysical structures (class E) represent the deeply eroded scars of very old craters but, owing to the lack of identified shock metamorphic features or impact-generated rocks, they cannot so far be classified as impact craters. So far, no craterform structure or ejeta layer of Archaean or Early Proterozoic age has been found in Fennoscandia. New ways of searching for these structures are proposed. The impact cratering rate in Fennoscandia is 2.4×10-14 km-2a-1.

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