Descriptions and preliminary interpretations of cores recovered from the Manson Impact Structure (Iowa)

Details Descriptions and preliminary interpretations of cores recovered from the Manson Impact Structure (Iowa) Descriptions and preliminary interpretations of cores recovered from the Manson Impact Structure (Iowa)

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24...35a&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 35-36 (SEE N94-12015 01-91)

Mathematics

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Breccia, Core Sampling, Cretaceous-Tertiary Boundary, Drilling, Ejecta, Geological Surveys, Lithology, Meteorite Craters, Terraces (Landforms), Cores, Crystallites, Terrain

Scientific paper

A core drilling program initiated by the Iowa Geological Survey Bureau and U.S. Geological Survey in 1991 and 1992 collected 12 cores totalling over 1200 m from the Manson Impact Structure, a probable K-T boundary structure located in north-central Iowa. Cores were recovered from each of the major structural terranes, with 2 cores (M-3 and M-4) from the Terrace Terrane, 4 cores (M-2, M-2A, M-6, and M-9) from the Crater Moat, and 6 cores (M-1, M-5, M-7, M-8, M-10, and M-11) from the Central Peak. These supplemented 2 central peak cores (1-A and 2-A) drilled in 1953. The cores penetrated five major impact lithologies: (1) sedimentary clast breccia; (2) impact ejecta; (3) central peak crystallite rocks; (4) crystalline clast breccia with sandy matrix; and (5) crystallite clast breccia with a melt matrix. Descriptions and preliminary interpretations of these cores are presented.

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