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The Manson impact structure - Its contribution to impact materials observed at the Cretaceous/Tertiary boundaryThe Manson impact structure (MIS) in Iowa is an excellently preserved complex crater that formed 65.7 Ma ago at the K/T boundary. Drill and seismic data have been used to identify three primary terranes within the 35-km diameter crater: (1) an outermost ring graben composed of listric normal fault blocks that structurally preserve Paleozoic and Cretaceous strata, impact ejecta, and possibly earliest Tertiary lake sediments; (2) a crater moat region of slumped and fallback materials overlain by Tertiary lake sediments in most areas; and (3) a central peak of uplifted basement rock capped in many areas by impact breccia. It is argued that concentrations of Ir at a K/T boundary exposure near Gubbio, Italy and clasts of glass reported from the K/T boundary in Haiti are consistent with possible production in the MIS.
Document ID
19920048236
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Anderson, Raymond R.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Hartung, Jack B.
(Iowa Department of Natural Resources Geological Survey Bureau, Iowa City, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Country: United States
Start Date: March 18, 1991
End Date: March 22, 1991
Sponsors: NASA, Lunar and Planetary Institute, American Association of Petroleum Geologists
Accession Number
92A30860
Funding Number(s)
CONTRACT_GRANT: NAG9-368
Distribution Limits
Public
Copyright
Other

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