Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p34a..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P34A-03
Other
[5400] Planetary Sciences: Solid Surface Planets, [5420] Planetary Sciences: Solid Surface Planets / Impact Phenomena, Cratering, [5470] Planetary Sciences: Solid Surface Planets / Surface Materials And Properties, [5475] Planetary Sciences: Solid Surface Planets / Tectonics
Scientific paper
The Manicouagan impact structure of Canada was formed at 214 Ma. It has an apparent rim-to-rim diameter of 80-90 km, with two ring features developed beyond this at 100 km and 120 km diameter. The structure is well preserved, undeformed and well exposed. It has suffered some erosion (<500 m), mainly due to glacial activity. As part of the 10-year Manicouagan Impact Research Program (MIRP), students and research scientists are engaged in studies to characterize this important terrestrial crater. In addition, MIRP collaborates with colleagues from other institutions to complement expertise and to provide additional insights (e.g., Arizona State University, Ludwig Maximilians University). Results from the first 5 years of MIRP activities will be presented, with emphasis on shallow (< 1-2 km) versus deep (>2 km) structure of the crater, based on field, geophysical and drill core. Shallow structure reveals a well-exposed anorthositic central uplift, collapsed rim (terrace zone) and sub-melt-sheet breccias. Drill core shows that, in places, the impact-melt sheet-footwall contact exhibits considerable topography, which is attributed to high-angle faulting. Thicker sections (>1 km) of the impact-melt sheet exhibit differentiation via fractional crystallization. Deep structure requires considerable bulk hydrodynamic behavior.
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