* Astronomy

Blobrana · L

RE: Charlevoix crater

Blobrana · L

Title: Zones of shock metamorphism at the Charlevoix impact structure, Quebec
Authors: P. B. Robertson

The distribution of particular shock metamorphic effects has been determined in the central uplift of the Charlevoix impact structure. Planar deformation features in quartz occur as much as 10 km from the central peak (Mont des Eboulements), whereas equivalent shock features in K-feldspar are restricted to within 2 km of the crater center. Weak planar features in K-feldspar are narrow (< 1 µm) but can become broad (4 to 8 µm) deformation twins in_more highly shocked samples. Common orientations are (24), (41), and (110) in orthoclase, and (13) and (110) in microcline, and the relative abundance of specific orientations does not change with shock level. Film perthite lamellae in K-feldspar break down to spindle microperthite within 6 km of the center, either as a result of shock or as a function of original depth of burial.

Read more

Blobrana · L

Coming down the long, impressively steep highway into Baie-Saint-Paul, we gave our brakes a rest about the half-way mark and stopped at a tourism information centre. The views are splendid, plus there's a small natural history museum with samples of meteorite and detailed explanations of its impact. The crater is among the 10 largest in the world and one of the few that's inhabited. Those with a scientific bent who want to know more can hire a guide at Randonnees Nature-Charlevoix, in Baie-Saint-Paul. The company offers tours of the crater and all kinds of information about its geology, plant and animal life.
Read more

Blobrana · L

The Charlevoix crater is a large eroded meteorite impact crater in Quebec, Canada. Only part of the crater is exposed at the surface, the rest being covered by the Saint Lawrence River. The original crater is estimated to have been 54 km in diameter and the age is estimated to be 342 ± 15 million years (Mississippian). The projectile was probably a stony asteroid, at least two kilometres in diameter, and weighing an estimated 15 billion tonnes. The Mont des Éboulements, situated in the exact centre of the crater, is interpreted as the central uplift, a consequence of elastic rebound. The crater is classified as a multi-ringed basin with a central uplift.

Read more

Latitude: 47°32N, Longitude: 70°18W