Physics
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30r.527k&link_type=abstract
Meteoritics, vol. 30, no. 5, page 527
Physics
Finds, Canada, Meteorites, Iab Iron, Lac Dodon, Penouille
Scientific paper
Although no new meteorites had been discovered in Canada since 1982, the year of 1994 proved to be exceptional in that in addition to the St.-Robert fall of 14 June [1], two iron meteorite finds were reported from the Province of Quebec, raising the total number of Canadian meteorites to 49. In May, 1994, Roland Octerneau of Montreal, reported the discovery of an iron meteorite of 800 g, approximately 10cm x 5cm x 6cm, from rural private property near Lac Dodon, nearest the village of St.-Calixte-de-Kilkenny, Comte Montcalm. The area is approximately 50km NNW of Montreal at 45 degrees 57 N, 73 degrees 55 W. The meteorite was oxidized on its exterior and lying at the surface of the ground when found in the summer of 1993. The meteorite is a coarse octahedrite (mean bandwidth 1.34mm) with narrow cloudy taenite bands separating the kamacite lamellae. Occasional areas of coarse to fine accicular plessite and net plessite are Neumann lines and rhabdites. Sparsely developed Brezina lamellae and fine-grained globular schreibersite are present. At one exterior surface, a heat-affected zone O.lmm thick containing unequilibrated alpha(sub)2-kamacite is preserved. Cloudy taenite extending into this zone has developed bainitic texture. The presence of the zone suggests a relatively recent fall. In the wake of the publicity surrounding the St.-Robert event, Christian Couture of Repentigny, Quebec, brought forward a small ellipsoidal meteorite of 72.5425 g. The meteorite was found in the summer of 1984 by the then 11 year old Couture while on a family vacation. The site of the find was a beach on the seaward side of the Presqu'ile de Penouille, a peninsula in the Baie de Gaspe (48 degrees 51'N, 64 degrees 26 W). The site is approximately 1 km south of the village of Penouille, Comte Gaspe-Est. The meteorite is a medium octahedrite (mean bandwidth 0.88mm) with narrow bands of cloudy taenite separating the kamacite lamellae, and occasional areas of net plessite. The kamacite lamallae are polygonalized and contain abundant Neumann lines. Rhadites are also abundant as well as occasional Brezina lamellae and globular schreibersite. In the plane of section, only two very small troilite nodules are present, but a large weathered nodule is present on the surface of the meteorite. A small remnant of unequilibrated alpha(sub)2-kamacite is evidence of a heat-affected zone. This evidence suggests that terrestrial oxidation, abrasion and corrosion of this meteorite were not extensive and that the fall was relatively recent. Both meteorites were analyzed by NAA utilizing NBS 809 and Odessa as standards, based on the procedures of Wasson et al. [2]. Analytical results are given in Table 1. Both meteorites are members of group IAB, although Penouille is a member of the Ni-rich IB tail of the group. The Ni vs trace element plots for Penouille display some scatter, although this phenomenon has been recently shown to be typical of the high-nickel tail of group IAB [3]. References: [1] Herd R. K. et al. (1995) 22nd Rochester Mineral. Symp., 16-17. [2] Wasson J. T. et al. (1989) GCA, 53, 735-744. [3] Choi B.-G. et al. (1995) GCA, 59, 593-612. Table 1 showing the analyses of Lac Dodon and Penouille appears here in the hard copy.
Herd Richard K.
Kissin Stephen A.
No associations
LandOfFree
Two New Iron Meteorites from the Province of Quebec, Canada does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Two New Iron Meteorites from the Province of Quebec, Canada, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two New Iron Meteorites from the Province of Quebec, Canada will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-830725