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Reckling Peak A80204 | |||||||||||||||||||||||||||||
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Basic information | Name: Reckling Peak A80204 This is an OFFICIAL meteorite name. Abbreviation: RKPA80204 This meteorite may also be called Reckling Peak 80204 (RKP 80204) in publications. Observed fall: No Year found: 1980 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 15.5 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 236 approved meteorites classified as Eucrite-br. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Writeup |
Writeup from AMN 4(2):
Sample No.: RKPA80204 Location: Reckling Peak Field No.: 1078 Weight (gms): 15.4 Meteorite Type: Eucrite
Physical Description: Roberta Score Black fusion crust covers one surface and appears as patches on two other surfaces.
Two texturally distinct lithologies are apparent in this achondrite. One texture (E end) is massive and fine grained. Rounded yellow clasts are obvious in this area. The second lithology (W end) has abundant small light and dark grains, making this area look coarser-grained. Thin (<1 mm) black veins extend into both textures. Abundant vugs give the exterior a rough surface. Therefore it is difficult to determine the relationship between the two lithologies. Chipping of the sample revealed a vein (i.2-3 non thick) of the coarse-grained lithology which extends partially into the massive lithology. The chip taken to be made into thin section contains both textures. Dimensions: 3 x 2 x 2 cm.
Petrographic Description: Brian Mason The section shows clasts (up to 6 mm in maximum dimension) of ophitic inter-growths of pigeonite and plagioclase, separated by veins of coarser-grained pigeonite and plagioclase. The plagioclase laths in the clasts range up to 0.5 mm in length. The pigeonite and plagioclase grains in the veins average about 0.3 nom in maximum dimensions. Microprobe analyses show pigeonite with a limited range of composition (Wo4Fs57En39 – Wo13Fs52En35). Plagioclase ranges in composition from An85 to An94, with a mean of An92. Accessory ilmenite is present. The meteorite is classified as a eucrite (pyroxene-plagioclase achondrite). Writeup from AMN 33(1): RKPA80204 original classification in AMN 4, no. 2, as a eucrite. Later reclassified in AMN 17, no. 1, as a eucrite unbrecciated. Subsequent studies and numerous thin sections reveal brecciation [1] and low siderophile elements consistent with a monomict breccia [2, 3]. Therefore this sample is reclassified as a brecciated eucrite.
[1] Yamaguchi, A. et al. (1997) Shock and thermal history of equilibrated eucrites from Antarctica. Antarctic Meteorite Research. Twentyfirst Symposium on Antarctic Meteorites, NIPR Symposium No. 10, National Institute of Polar Research, p.415. [2] Warren P. H., Kallemeyn, G.W., Huber, H., Ulff-Møller, and Choe, W., (2009) Siderophile and other geochemical constraints on mixing relationships among HED-meteoritic breccias. Geochimica et Cosmochimica Acta, 73, iss. 19, p. 5918-5943. [3] Mittlefehldt, D.W., and Lindstrom, M.M. (2003) Geochemistry of eucrites: Genesis of basaltic eucrites, and Hf and Ta as petrogenetic indicators for altered Antarctic eucrites. Geochimica et Cosmochimica Acta, 67, no. 10, 1911-1935. | ||||||||||||||||||||||||||||
Data from: MB76 Table 2 Line 5392: |
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References: | Published in Antarctic Meteorite Newsletter 33(1) (2010), JSC, Houston Published in Antarctic Meteorite Newsletter 4(2) (1981), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
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