70th Annual Meeting (2007) 5049.pdf

HAGERSVILLE, A NEW CANADIAN IRON S.A. Kissin1 and R.K. Herd2. 1Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1 Canada E-mail: [email protected]. 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8 Canada

Introduction: While clearing stones from a seeded field on his family farm near the village of Hagersville, Haldimand County, Ontario, Canada (42º58’N, 80º09’W), Mr. Joseph Mahé found a 30 kg in April, 1999. The meteorite was shallowly buried in the cultivated field. Composition: The composition as determined by INAA is: Ni 6.89 wt%, Ge 318 ppm, Ga 75.1 ppm, Ir 2.36 ppm, As 16.9 ppm, Au 1.5 ppm, Co 0.483 wt%, Cr 10 ppm, Cu 125 ppm, Pt 5.9ppm, Re 260 ppb, Sb 327 ppb, W 1090 ppb. The composition places this meteorite in group IAB. Petrography: Hagersville is a coarse (Og) with very narrow and somewhat discontinuous lamellae and sparse development of net . Abundant rhabdites are pre- sent , as well as limited development of lamellar . The contains abundant Neumann lines, and the kama- cite itself is polygonalized. The meteorite is extensively weath- ered on the exterior surface, oxidation products are developed along the surfaces of the lamellae and cracks. Some of the rhab- dites are accentuated by oxidation. No remnants of a heat- affected zone were observed. Discussion: The composition of Hagersville lies in a highly populated area on log Ni vs. log element plots for group IAB. Thus, its composition resembles that of a number of group IAB members, especially those of the widely distributed North American Canyon Diablo and Odessa. In comparison with mean compositions of the latter [1], Hagersville lies within two std. dev. of the elemental composition of Odessa and within two std. dev. of all elements except Au anc Cu in Canyon Diablo. However, Hagersville differs from Odessa in that the latter con- tains abundant and troilite-graphite nodules, estimated at one per 12 cm2[2], as well as abundant and graphite in the cliftonite habit. Troilite and troilite-graphite nodules are also abundant in Canyon Diablo, as well as a range of shock features not seen in Hagersville. The similarity in composition of Hagersville to that of Odessa and Canyon Diablo can be attrib- uted to the high population of group IAB irons with this range of compositions. References: [1] Wasson J.T. unpublished data. [2] Buch- wald V.F. 1974, Handbook of Iron Meteorites.