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Sierra Gorda 010
Basic information Name: Sierra Gorda 010
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2017
Country: Chile
Mass:help 280 g
Classification
  history:
Recommended:  R4-an    [explanation]

This is the only approved meteorite classified as R4-an.
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 12 Apr 2019
Writeuphelp
Writeup from MB 108:

Sierra Gorda 010        22°30.49’S, 69°07.65’W

Antofagasta, Chile

Find: 2017 Oct 20

Classification: R4-an

History: One individual meteorite (280 g) was found in the desert by T. V. Kryachko.

Physical characteristics: The meteorite has a dark-brown fusion crust and greenish-gray color.

Petrography: M. A. Ivanova (Vernad) Meteorite consists of POP, BO and OP chondrules, up to 0.7 mm and matrix; matrix/chondrule ratio is ~1; some chondrule boundaries are not clear; main minerals are olivine, plagioclase, pyroxene, sulfides (pentlandite, pyrrhotite), magnetite; acsessory minerals are ilmenite and spinel; Fe,Ni metal is absent. Magnetic susceptibility (J. Gattacceca, CEREGE) log χ (× 10-9 m3/kg) = 4.28 is an order of magnitude higher than for the usual R chondrites, and indicate a magnetite content of ~4 wt%.

Geochemistry: Mineral compositions and geochemistry: M. A. Ivanova (Vernad, SI), V. V. Kozlov (Oxford Instruments OM & Gatan Inc., Moscow Office) Olivine: Fa36.9±0.3 (N=42), NiO - 0.44 wt%, orthopyroxene: Fs20.5±6.3Wo0.9±0.5 (N=35); augite Fs11.7±0.5Wo43.4±0.8; diopside Fs8.4±2.5Wo46.5±0.5; magnetite is highly enriched in Cr2O3 (9.0 wt%, n=27), and TiO2 (1.56 wt%) and Al2O3 (1.6 wt%); plagioclase composition is An4.7-12.2Ab83.3-89.0; sulfides are pyrrhotite and pentlandite; Oxygen isotopic compositions: (OU) after acid washing δ17O 5.684, 5.594; δ18O 5.005, 4.932; Δ17O 3.082, 3.029 (all per mil).

Classification: Chondrite, R4. The anomalous designation comes from the Fa content of olivine that is lower than in other R chondrites, and from the unusual and abundant magnetite enriched in Cr2O3 (up to 9.0 wt%) and TiO2 (up to 1.56 wt%).

Specimens: One sample wheighing 64.9 g and a thin section are deposited in Vernad. Main mass with Mr. T. V. Kryachko (bredfield@mail.ru).

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:desert
Date:2017 Oct 20
Latitude:22°30.49'S
Longitude:69°07.65'W
Mass (g):280
Pieces:1
Class:R4-an
Shock stage:S1
Weathering grade:W4
Fayalite (mol%):36.9±0.3 (N=43)
Ferrosilite (mol%):20.5±6.3 (N=35)
Wollastonite (mol%):0.9±0.5 (N=35)
Magnetic suscept.:4.28
Classifier:M. A. Ivanova, Vernad
Type spec mass (g):64.9
Type spec location:Vernad
Main mass:Mt. T. V. Kryachko (bredfild@mail.ru)
Finder:Mt. T. V. Kryachko (bredfild@mail.ru)
Comments:field number is Calama 3-40; submitted by Marina Ivanova
Plots: O isotopes:  
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Timur Kryachko      
Geography:

Chile
Coordinates:
     Recommended::   (22° 30' 29"S, 69° 7' 39"W)

Statistics:
     This is 1 of 1387 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1414 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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