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Reckling Peak A80204
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:help 15.5 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(2)  (1981)  Eucrite
AMN 17(1)  (1994)  Eucrite-unbr
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-unbr
NHM Catalogue:  5th Edition  (2000)  Eucrite-unbr
MetBase:  v. 7.1  (2006)  Eucrite-mmict
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  Eu "br"
Recommended:  Eucrite-br    [explanation]

This is 1 of 167 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
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:
Mass (g):15.5
Class:Eu "ub"
Weathering grade:A
Ferrosilite (mol%):52-57
Catalogs:
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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:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 16'S, 159° 15'E)
     Recommended::   (76° 12' 39"S, 158° 27' 26"E)
Note: the NHM and MetBase coordinates are 22 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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