Meteoritical Bulletin: Entry for LaPaz Icefield 031275

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LaPaz Icefield 031275

Basic information

Name: LaPaz Icefield 031275
This is an OFFICIAL meteorite name.
Abbreviation: LAP 031275
Observed fall: No
Year found: 2003
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 6.1 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 29(2)	(2006)	R
Meteoritical Bulletin:	MB 92	(2007)	R
Antarctic Meteorite Newsletter:	AMN 31(1)	(2008)	R5
	AMN 43(1)	(2020)	R3.6
Recommended:			R3.6 [explanation]

This is 1 of 4 approved meteorites classified as R3.6. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)

Comments:

Approved 1 Sep 2006
Revised 21 Feb 2020: Reclassified in AMN 43(1)

Writeup

Writeup from AMN 29(2):

Sample No.:	LAP 031275
Location:	LaPaz Ice Field
Field No.:	16190
Dimensions (cm):	2.75x1.25x1.25
Weight (g):	6.148
Meteorite Type:	R Chondrite

Macroscopic Description: Kathleen McBride
Brown/black fusion crust with oxidation halos covers 100% of this meteoriteâ€™s exterior surface. The interior has a gray matrix with rust and small black inclusions.

Thin Section (,2) Description: Tim McCoy
The section consist of rare, well-defined, chondrules (up to 1 mm) set in a recrystallized matrix of silicates and sulfides (both troilite and pentlandite). Olivines are nearly homogeneous (Fa_38-42, with a small tail of analyses down to Fa₁₇) and a singe pyroxene is Fs₂₄. The meteorite is an R chondrite of type 5.

Thin Section Images

Cross-Polarized Light	Plane-Polarized Light

Lab Images

Writeup from AMN 43(1):

LAP 031275, reclassification

LAP 031275 was announced as an R5 chondrite in the September 2006 newsletter. Subsequent studies have showed that it is more likely an R3.6 (Lunning et al., 2020).

Bibliography:

Lunning N.G., Bischoff A., Gross J., Patzek M., Corrigan C.M., and McCoy T.J. (2020) Insights into the formation of silica-rich achondrites from impact melts in Rumuruti-type chondrites. Meteorit. Planet. Sci. 55, 130-148. (link)

Data from:
  MB92
  Table 3
  Line 419:

Mass (g):	6.1
Class:	R
Weathering grade:	B/C
Fayalite (mol%):	17-42
Ferrosilite (mol%):	24

Catalogs:

Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 29(2) (2006), JSC, Houston
Published in Antarctic Meteorite Newsletter 43(1) (2020), JSC, Houston
Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

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Photos:

Credit	Photos
Photographs from AMN:
JSC	A photo is in the write-up above

Geography:

Antarctica

Coordinates:

Unknown.

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
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