Fragenstein

2026-10-17T18:43:20Z

Europejski Gibeon, bo nie Muonionalusta:

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	:Classification: Iron meteorite (IVA)		:Classification: Iron meteorite (IVA)

-	'''History''': (M. Patzek, ''IfP'') Found on 5 September 2020 by an anonymous person who was climbing in a stream bed in the Austrian Alps in the wider area of Zirl, above the current water line. The finder noted it due to the metallic appearance. The surface showed evidence of a Widmanstätten pattern, made visible by terrestrial alteration.	+	'''History''': (M. Patzek, ''IfP'') Found on 5 September 2020 by an anonymous person who was climbing in a stream bed in the Austrian Alps in the wider area of Zirl, above the current water line. The finder noted it due to the metallic appearance. The surface showed evidence of a Widmanstätten pattern, made visible by terrestrial alteration.

	'''Physical characteristics''': (M. Patzek, ''IfP'') One individual (~3820 g) without visible fusion crust with a density of 7.875±0.009 g/cm³ determined by 3D scanning. Slightly polished exterior with vague visible Widmanstätten pattern, due to different resistance to weathering of taenite and kamacite. The overall absence of fusion crust or oxide layer indicates continuous erosion of the outer parts of the meteorite by movement and mechanical abrasion. Etched cut face shows Widmanstätten pattern with <0.5 mm wide kamacite lamellae. Depressions on the outer part of the meteorite contain black remnants of a possible fusion crust.		'''Physical characteristics''': (M. Patzek, ''IfP'') One individual (~3820 g) without visible fusion crust with a density of 7.875±0.009 g/cm³ determined by 3D scanning. Slightly polished exterior with vague visible Widmanstätten pattern, due to different resistance to weathering of taenite and kamacite. The overall absence of fusion crust or oxide layer indicates continuous erosion of the outer parts of the meteorite by movement and mechanical abrasion. Etched cut face shows Widmanstätten pattern with <0.5 mm wide kamacite lamellae. Depressions on the outer part of the meteorite contain black remnants of a possible fusion crust.

-	'''Petrography''': (M. Patzek, ''IfP'') Kamacite lamellae have a mean width of 0.31±.1 (range from 0.19 to 0.48: n=23).	+	'''Petrography''': (M. Patzek, ''IfP'') Kamacite lamellae have a mean width of 0.31±.1 mm (range from 0.19 to 0.48: n=23).

-	Geochemistry: Mineral compositions and geochemistry: (M. Patzek, ''IfP'') Trace Element{{!trace elements\|}} concentrations have been determined by LA-ICP-MS.{{!LA-ICP-MS\|}} A Muonionalusta{{MBD-record\|name=Muonionalusta}} sample was used as an internal unknown sample to verify the accuracy of the analyses (G. Papola, F. Wombacher, M. Fischer-Gödde, ''Köln''). 1 RSD% of the element data is given in brackets: Fe 90.77 wt% (0.5%), Ni 8.85 wt% (4%), Co 3814 ppm (2.5%), Cu 100 ppm (15%), Ga 2.07 ppm (7%), Mo 7.29 ppm (10%), Os 1.04 ppm (10%), Ir 1.08 ppm (10%), Ru 2.72 ppm (8%), Pt 4.27 ppm (10%), Rh 0.77 ppm (6%), Pd 7.6 ppm (6%), Au 2.03 ppm (5%). The chemical similarities with Muonionalusta motivated a detailed analyses of cosmogenic radionuclides. Cosmic ray exposure: A small aliquot sample (~88 mg) of the Fragenstein specimen was analyzed for several cosmogenic radionuclides (<sup>10</sup>Be, <sup>26</sup>Al, <sup>36</sup>Cl, and <sup>41</sup>Ca) at the VERA facility, ''UVien''. All measured isotopic ratios and resulting specific radioactivities from ~3.5 dpm/kg <sup>26</sup>Al to ~21 dpm/kg <sup>36</sup>Cl are about three orders of magnitude higher than radioactivity levels for a sample from an iron meteorite of very similar chemical composition, i.e., Muonionalusta. The high levels of <sup>36</sup>Cl and <sup>41</sup>Ca (~17 dpm/kg) of Fragenstein preclude a long terrestrial age.{{!terrestrial age\|}}	+	Geochemistry: Mineral compositions and geochemistry: (M. Patzek, ''IfP'') Trace Element{{!trace elements\|}} concentrations have been determined by LA-ICP-MS.{{!LA-ICP-MS\|}} A Muonionalusta{{MBD-record\|name=Muonionalusta}} sample was used as an internal unknown sample to verify the accuracy of the analyses (G. Papola, F. Wombacher, M. Fischer-Gödde, ''Köln''). 1 RSD% of the element data is given in brackets: Fe 90.77 wt% (0.5%), Ni 8.85 wt% (4%), Co 3814 ppm (2.5%), Cu 100 ppm (15%), Ga 2.07 ppm (7%), Mo 7.29 ppm (10%), Os 1.04 ppm (10%), Ir 1.08 ppm (10%), Ru 2.72 ppm (8%), Pt 4.27 ppm (10%), Rh 0.77 ppm (6%), Pd 7.6 ppm (6%), Au 2.03 ppm (5%). The chemical similarities with Muonionalusta motivated a detailed analyses of cosmogenic radionuclides. Cosmic ray exposure: A small aliquot sample (~88 mg) of the Fragenstein specimen was analyzed for several cosmogenic radionuclides (<sup>10</sup>Be, <sup>26</sup>Al, <sup>36</sup>Cl, and <sup>41</sup>Ca) at the VERA facility, ''UVien''. All measured isotopic ratios and resulting specific radioactivities from ~3.5 dpm/kg <sup>26</sup>Al to ~21 dpm/kg <sup>36</sup>Cl are about three orders of magnitude higher than radioactivity levels for a sample from an iron meteorite of very similar chemical composition, i.e., Muonionalusta. The high levels of <sup>36</sup>Cl and <sup>41</sup>Ca (~17 dpm/kg) of Fragenstein preclude a long terrestrial age.{{!terrestrial age\|}}

	'''Classification''': (M. Patzek, ''IfP'') Iron, IVA, based on trace element abundances, petrography and mineral chemistry. Fine octahedrite. Despite the very similar composition of Fragenstein and Muonionalusta, the cosmogenic radionuclide concentrations of Fragenstein clearly show that they fell in separate events despite being chemically very similar.		'''Classification''': (M. Patzek, ''IfP'') Iron, IVA, based on trace element abundances, petrography and mineral chemistry. Fine octahedrite. Despite the very similar composition of Fragenstein and Muonionalusta, the cosmogenic radionuclide concentrations of Fragenstein clearly show that they fell in separate events despite being chemically very similar.
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	== Zobacz również ==		== Zobacz również ==

-	* meteoryty: [[Kaposfüred]] {{Sb}} [[Steinbach]]	+	* meteoryty: [[Hirschbach]] {{Sb}} [[Kaposfüred]] {{Sb}} [[Steinbach]]
	* meteoryt [[Zadzim]]		* meteoryt [[Zadzim]]

Wiki.Meteoritica.pl - Zmiany w linkowanych z „Plik:Fragenstein (Universität Innsbruck)-fig1.jpg” [pl]

Fragenstein