|Basic information||Name: Paposo 017|
This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2010
Mass: 352 g
This is 1 of 158 approved meteorites classified as CR2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
|Comments:||Approved 26 Jul 2014|
Writeup from MB 103:
Paposo 017 25°0’ S, 70°28’ W
Classification: Carbonaceous chondrite (CR2)
History: Found March 6, 2010, by Eric Christensen while searching for meteorites. Two pieces that fit together (238.6 g and 113.1 g) were found ~1 m apart.
Physical characteristics: Exterior with patches of frothy, bubbly flat-black fusion crust. Some cracks present. Sawn surface shows many large (to 3 mm though most 0.5 to 1 mm), well-defined chondrules (some stained red) in a fine-grained dark matrix. Sparsely distributed white calcium-aluminum-rich inclusions (to 1 mm) visible in a four cm2 slice. Metal weathered in patches; where present, is abundant in matrix and decorating chondrule rims. Stone moderately weathered.
Petrography: Thin section shows packed rounded to irregularly shaped chondrules separated by opaque matrix. Fine-grained sulfide and metal abundant in matrix. Metal ~60% weathered to iron oxides. Wide variety of chondrule types present including PO, POP, PP, RP, and BO, including many with igneous rims, for example, BO core with POP rim and large single-crystal olivine grain with POP rim. Low-Ca pyroxene with polysynthetic twinning common in some PP chondrules. Olivine shows planar fractures and undulatory extinction consistent with moderate shock.
Geochemistry: (P. Castleberry, D. Van Hoy and L. Garvie, ASU) Chondrule olivines show wide Fa range from Fa0.5-55.5, n=38, with Cr2O3 to 1.1 wt%. Forsteritic olivines Fa1.2±0.7, CaO=0.39±0.07 wt%, n=6. Low-Ca pyroxene has a wide Fs range from Fs2.9-28.7, mean Fs16.1±11.4Wo1.3±1.3, Fe/Mn=19.7±7.8, Al2O3=0.4±0.3, n=18; pigeonite Fs13.4Wo15.3, n=1; augite Fs15.4Wo31.1, Cr2O3=1.6 wt%, n=1. Plagioclase Or8.0Ab12.9An79.2, n=1.
Classification: Carbonaceous chondrite (CR2). Low microprobe totals from the matrix is consistent with type 2.
Specimens: 32.9 g and one polished thin section at ASU.
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
|References:||Published in Meteoritical Bulletin, no. 103, in preparation (2014)|
This is 1 of 909 approved meteorites from Antofagasta, Chile (plus 1 impact crater)
This is 1 of 934 approved meteorites from Chile (plus 9 unapproved names) (plus 1 impact crater)
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