The surface structure of the Haughton impact crater, Devon Island, Canada

Details The surface structure of the Haughton impact crater, Devon Island, Canada The surface structure of the Haughton impact crater, Devon Island, Canada

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988metic..23..209b&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 23, Sept. 1988, p. 209-220. DFG-supported research.

Mathematics

Logic

15

Geological Faults, Geological Surveys, Geomorphology, Impact Melts, Meteorite Craters, Breccia, Canada, Lithology, Sedimentary Rocks, Stratigraphy

Scientific paper

Recent geological and structural investigations support the existing descriptions fo the Haughton structure being a dome-like structure. The central area represents the central uplift and is formed by blocks of rocks belonging to the oldest part of the Devon Island Paleozoic sediment cover. The morphologically defined 'inner ring' is a structurally distinct zone, predominated by gypsum beds of the Bay Fiord Formation. These beds dip 30 to 40 deg outward and are asymmetrically folded. The outer radius of this ring is 5 to 5.5 km. A 1 to 1.5 km broad zone follows outward of more chaotically oriented blocks of rocks, which may be considered a megablock-zone. The next ring-like zone is strongly faulted ('faulted annulus') and obviously represents the downfaulted, once uplifted crater rim. Within this structural annulus, a marked asymmetry of the crater structure is expressed by the attitude of the faulted blocks. The structure of the northern and eastern segments of the faulted annulus differ substantially from those of the southern and western segments. This asymmetry may reflect heterogeneities in the pre-crater geology or a low angle impact.

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