| タイトル | Descriptions and preliminary interpretations of cores recovered from the Manson Impact Structure (Iowa) |
| 著者（英） | Shoemaker, E. M.; Witzke, B. J.; Roddy, D. J.; Anderson, R. R.; Hartung, J. B. |
| 著者所属（英） | Iowa Geological Survey |
| 発行日 | 1993-01-01 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 94N12032 |
| 権利 | No Copyright |
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