Meteoritical Bulletin: Entry for LaPaz Icefield 03923

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LaPaz Icefield 03923

Basic information

Name: LaPaz Icefield 03923
This is an OFFICIAL meteorite name.
Abbreviation: LAP 03923
Observed fall: No
Year found: 2003
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 20.6 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 29(1)	(2006)	CK5
Meteoritical Bulletin:	MB 91	(2007)	CK5
	MB 101	(2012)	LL5
Antarctic Meteorite Newsletter:	AMN 36(1)	(2013)	LL5
Recommended:			LL5 [explanation]

This is 1 of 3298 approved meteorites (plus 1 unapproved name) classified as LL5. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 21 Feb 2006
Revised 25 Feb 2013: Reclassified in AMN 36(1)

Writeup

Writeup from AMN 29(1):

Sample No.:	LAP 03923
Location:	LaPaz Ice Field
Field No.:	16455
Dimensions (cm):	3.0x2.5x1.5
Weight (g):	20.6
Meteorite Type:	CK5 Chondrite

Macroscopic Description: Kathleen McBride
The exterior is covered with brown/black fusion crust with polygonal fractures. The gray matrix has minor rust and high metal content. A few gray chondrules are visible.

Thin Section (,2) Description: Tim McCoy
The section consists of large (up to 1.5 mm) poorly-defined chondrules in a matrix of finer-grained silicates, sulfides and magnetite. The meteorite is little weathered, but extensively shock blackened. Silicates are homogeneous. Olivine is Fa₃₁ and orthopyroxene is Fs₂₅. The meteorite is a CK5 chondrite.

Cross-Polarized Light	Plane-Polarized Light	Cross-Polarized Light	Plane-Polarized Light

Writeup from AMN 36(1):

LaPaz Icefield 03923 (LAP 03923)

Antarctica

Found: 2003

Classification: Ordinary chondrite (LL5)

Reclassification (announced vol. 29, no. 1): This sample was originally classified as a CK5 chondrite, but chemical analyses reveal that it is very close in composition (Zn/Mn vs. Al/Mn) to many other LL chondrites (Isa, M. et al., 2011, LPSC abstract #1876). This information, together with the observation that there is metal present and no magnetite, has led us to reclassify this sample as an LL5 chondrite.

Data from:
  MB91
  Table 4
  Line 396:

Mass (g):	20.6
Class:	CK5
Weathering grade:	A/B
Fayalite (mol%):	31
Ferrosilite (mol%):	25

Catalogs:

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

References:

Published in Antarctic Meteorite Newsletter 29(1) (2006), JSC, Houston
Published in Antarctic Meteorite Newsletter 36(1) (2013), JSC, Houston
Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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Photos:

Credit	Photos
Photographs from AMN:
Photograph from unknown source	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
history:

This lists important revisions made to data for this record.

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