Investigation of the Manicouagan impact crater, Quebec - an introduction

Details Investigation of the Manicouagan impact crater, Quebec - an introduction Investigation of the Manicouagan impact crater, Quebec - an introduction

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2729p&link_type=abstract

Journal of Geophysical Research, vol. 83, June 10, 1978, p. 2729-2735.

Physics

5

Breccia, Meteorite Craters, Meteoritic Damage, Canada, Igneous Rocks, Melting, Mineralogy, Planetary Surfaces

Scientific paper

An interdisciplinary study of the 65-km diameter Manicouagan ring structure in Quebec was undertaken to gain insight into the integrated effects of impacts on terrestrial planetary bodies. The paper serves as an introduction to several companion papers and summarizes major conclusions. Studies of the 214 m.y. old structure show that the melt rocks are texturally inhomogeneous but chemically homogeneous and can be modeled as a mixture of target lithologies. The melt rocks have a Sr-87/Sr-86 ratio compatible with the melting of crustal rocks. The melt had a two-stage cooling history with clast-melt interactions indicative of mixing superheated silicate liquid with cold clasts. Grain size, clast reactions, and thermal equilibration of clasts and melts are described.

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