![seymchan meteorite seymchan meteorite](https://assets.catawiki.nl/assets/2020/9/25/6/a/5/6a5cd5d6-716b-4e41-ab0a-60555a7bbbb7.jpg)
Note thin metal veinlets between the olivine crystals. Slice furnished the mount for microprobe work.
![seymchan meteorite seymchan meteorite](https://www.christies.com/img/LotImages/2016/CSK/2016_CSK_12341_0031_000(large_seymchan_meteorite_slice_pallasite_pmg_magadan_district_russia055858).jpg)
Preparation of polished mounts and thin sections. Seymchan, unpolished, perfect material for Two thin slices of coarse pallasite facies of The raw material of which is shown in the following photograph.įigure 4. Kamacite, schreibersite and Ni-poor magnesian olivine. Geology, University of Toronto (thanks to the capable assistance of Yanan Liu,Ī summary of the results follows for the principal phases in the analysed sample: Were conducted in November 2011, using the SX-50 instrument at the Department of Some wavelength-dispersive electron microprobe analyses of mineral grains
![seymchan meteorite seymchan meteorite](https://www.carionmineraux.com/meteorite/meteorites_112020/seymchan-225-b.jpg)
Immediate provenance of the slab and the smaller slices above: Blaine Reed. Note the olivines in the foreground, metal beyond, and coarse schreibersite rhabdites Of metal intruding a pallasitic crystal mush (?). However, roughlyĩ5 percent of the volume appears to be solid nickel-iron, The dimpled outer edge is visible, apparently of a very coarse pallasite facies. Hence the metallographic fabric is not clearly visible on the sawn faces. The sample was sawn and polished, but is currently unetched, Diagonals of the piece are roughly 71 cm (28"): large, but there are yet wider pieces of both iron and pallasite facies of this exceptionally One corner of a large rectangular slab of Seymchan, roughlyĦ3 x 33 x 8.5 cm, mass circa 110 kg (roughly 25 x 13 x 3.25 inches, 240 pounds). Some faces are rounded, but many appear to be fractured, and very fewĪpproximate well-developed crystal habit.įigure 3. The olivine grains are commonly angular,Īnd range from <1 mm to 11x9 mm in section. Here are three polished, unetched thin slices,Ģ8.29 (top), 22.50 and 6.66 grams, of the pallasitic facies of Seymchan.ġ-centimetre cube for scale. Ppm As, 662-694 ppb Ir and 2.1 ppm Au (3 analyses),Īnd Seymchan is seen as a main group pallasiteįigure 2.
#Seymchan meteorite plus#
The bulk metal contains roughly 0.53% Co and 9.3-9.5% Ni plus 18 Shows that the two are identical, and thus parts of one fall Of Seymchan pallasite metal and fragments of the iron "facies" Glorieta Mountain and Brenham also contain large regions Olivine grain size and metal:olivine ratios with metal veins up to tens ofĬm in thickness. Photographs of this new (2004) material show great heterogeneity in The meteoritic literature is slowly catching up with thisįascinating find. Most intriguing, the finds in the 2000s have revealed that perhapsĨ0% of the material is iron, but the remaining 20% is pallasite. Was later reclassified as an "ungrouped iron" (Wasson and Wang, 1986). With kamacite bandwidth 2.0 mm, and early analyses returning 9.47 and 9.15% nickel Identified as a coarse octahedrite, a IIE iron meteorite It is clear that the current recovered mass is far greater, North via the Kolyma River to enter the East Siberian Sea The two pieces, 20 metres apart, were reportedlyĬhannel, on the west side of the main branch of the Hekandue River, that flows The first find in 1967 was followed by a second mass, reported total Surrounding the pallasite "lens" ( olivine and kamacite), with coarseīronze-coloured axe-head crystals ("rhabdites") of the iron-nickel Metal, largely a nickel-iron alloy ( kamacite), Is only now receiving wide attention, due to much Seymchan is a meteorite find from the Magadan "Rock of the Month #127, posted for January 2012". Immediate provenance: Eric Wichman / Michael Miller. As with a smooth rock outcrop,Ī sawn slice shows just two dimensions of a 3-D reality, Segregating one from the other, as coeval and Or if the two "facies" (metal-silicate and metal) Pallasite is intruding iron, or vice versa, This is not unknown in Seymchan material and To be a lens or vein of pallasite "facies" material What appears (caveat: at the scale of the palm of your hand!) The slice is remarkable for displaying the contact between Of the Seymchan meteorite, 143.92 grams, circa 11.2圆.0x0.45 cm in size.
![seymchan meteorite seymchan meteorite](https://i.ebayimg.com/images/i/400143580044-0-1/s-l1000.jpg)
Mingled within one or more fragmented metre-scale masses found in Siberia Seymchan Meteorite displaying "facies" of both pallasite and iron meteorite