Mathematics – Logic
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9622753g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 25, 1991, p. 22,753-22,764.
Mathematics
Logic
102
Breccia, Geological Faults, Igneous Rocks, Impact Melts, Terrain Analysis, Metamorphism (Geology), Stratigraphy
Scientific paper
The origins of the Sudbury Structure and associated Igneous Complex have been controversial. Most models call for a major impact event followed by impact-induced igneous activity, although totally igneous models are still being proposed. Much of the controversy is due to a misunderstanding of the size of the original Sudbury Structure. By analogy with other terrestrial impact structures, the spatial distribution of shock features and Huronian cover rocks at the Sudbury Structure suggest that the transient cavity was about 100 km in diameter, which places the original final structural rim diameter in the range of 150-200 km. Evidence is presented from least squares mixing models that the average composition of the Igneous Complex corresponds to a mix of Archean granite-greenstone terrain, with possibly a small component of Huronian cover rocks. The Igneous Complex is differentiated, which is not a characteristic of previously studied terrestrial impact melt sheets. This can be ascribed to its great thickness and slower cooling. If this working hypothesis is accepted, namely, that both the Sudbury Structure and the Igneous Complex are impact in origin, then previous hybrid impact-igneous hypotheses can be discarded and the Sudbury Structure can be studied specifically for the constraints it provides to large-scale cratering and the formation of basin-sized (multiring?) impact structures.
Deutsch Alex
Grieve Richard A. F.
Stoeffler Dieter
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