Meteoritical Bulletin: Entry for Northwest Africa 13511

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Northwest Africa 13511

Basic information

Name: Northwest Africa 13511
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13511
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 1089 g

Classification
history:

Recommended:

R4 [explanation]

This is 1 of 65 approved meteorites classified as R4. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)

Comments:

Approved 23 Jan 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 13511 (NWA 13511)

(Northwest Africa)

Purchased: 2020 Aug

Classification: Rumuruti chondrite (R4)

History: Purchased by Rachid Chaoui in August 2020 from a Mauritanian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed porphyritic and barred chondrules are set in a finer grained matrix containing sodic plagioclase, troilite and pentlandite (both exhibiting minor secondary alteration to Fe hydroxides). Metal is absent. Olivine has equilibrated compositions (except for rare more magnesian cores) whereas low-Ca pyroxene has a moderate compositional range.

Geochemistry: Olivine (Fa_39.8±0.7, range Fa_39.1-40.7, N = 4; magnesian core Fa_15.9), low-Ca pyroxene (Fs_21.4±8.2Wo_1.6±1.3, range Fs_15.0-30.6Wo_0.6-3.1, N = 3), augite (Fs_14.0±2.0Wo_41.7±5.3, range Fs_12.6-15.4Wo_45.4-37.9, N = 2), plagioclase (An_8.9Ab_85.9Or_5.2). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ¹⁷O 5.597, 5.772, 5.651; δ¹⁸O 6.049, 5.963, 5.922; Δ¹⁷O 2.404, 2.624, 2.524 per mil (all data linearized).

Classification: R4 chondrite.

Specimens: 24.5 g including one polished thin section at UWB; remainder with Mr. R. Chaoui.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2020 Aug
Mass (g):	1089
Pieces:	1
Class:	R4
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	39.8±0.7
Ferrosilite (mol%):	21.4±8.2
Wollastonite (mol%):	1.6±1.3
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	24.5
Type spec location:	UWB
Main mass:	R. Chaoui
Comments:	Work name RC136.7; submitted by A. Irving

Plots:

O isotopes:

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 110, in preparation (2021)

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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