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Sierra Gorda 060
Basic information Name: Sierra Gorda 060
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2021
Country: Chile
Mass:help 7.7 kg
Classification
  history:
Recommended:  H3    [explanation]

This is 1 of 668 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 17 Apr 2022
Writeuphelp
Writeup from MB 111:

Sierra Gorda 060        22°30.02’S, 69°2.63’W

Antofagasta, Chile

Find: 15 Mar 2021

Classification: Ordinary chondrite (H3)

Petrography: The meteorite has chondritic texture and is composed of chondrules (av. diameter 640 um), chondrule fragments, and mineral grains with interstitial, fine-grained, clastic matrix. The main phases are olivine, pyroxene, feldspatic glass, Fe,Ni iron and troilite; chromite and Ca-phosphate are accessory. The chondrules are of the BO, PO, PP, CC, BP, POP, RP types. Chondrule mesostasis is isotropic. Olivine has undulatory optical extinction and irregular fracturing. Local melt pockets and discontinuous melt veins were observed. Bulk Fe,Ni metal abundance is 4.6 vol.%, which is intermediate between the metal content of H and L chondrites (7.80±0.62 vol%, n=25, and 3.54±0.34 vol%, n=53, respectively, from Gattacceca et al., 2014).

Geochemistry: Olivine: Fa20.2±4.3 (N=17), PMD Fa = 14.6%; pyroxene Fs12.9±5.9Wo1.0±0.5 (N=16); kamacite (Borisovsky S. E., EPMA, IGEM, all in wt.%): Ni=6.02±0.34; Co=0.52±0.04 (N=6).

Classification: Ordinary chondrite, H3. The metal content, and metal composition are intermediate between H and L groups, and chondrules are larger than in typical H3 chondrites.

Bibliography:
  • Gattacceca J., Suavet C., Rochette P., Weiss B.P., Winklhofer M., Uehara M. Friedrich J.M. (2014) Metal phases in ordinary chondrites: magnetic hysteresis properties and implications for thermal history. Meteorit. Planet. Sci. 49 652-676/ (link)
Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Date:15 Mar 2021
Latitude:22°30.02'S
Longitude:69°2.63'W
Mass (g):7700
Pieces:Many
Class:H3
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):20.2±4.3 (N=17)
Ferrosilite (mol%):12.9±5.9 (N=16)
Wollastonite (mol%):1.0±0.5 (N=16)
Classifier:Lorenz C. A., Vernad
Type spec mass (g):1500
Type spec location:Vernad
Main mass:Mr. M. Nepomiluev, ramatahatta2@mail.ru
Finder:Mr. M. Nepomiluev
Comments:Field name is M7-11; analyst T. Kryachko (The Russian system of quality, Technograd, Moscow); submitted by Lorenz C.A., Vernad
Institutions
   and collections
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
IGEM: Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetny Per., 35, Moscow, 119017 , Russia (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
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Geography:

Chile
Coordinates:
     Recommended::   (22° 30' 1"S, 69° 2' 38"W)

Statistics:
     This is 1 of 2310 approved meteorites from Antofagasta, Chile (plus 8 unapproved names) (plus 1 impact crater)
     This is 1 of 2339 approved meteorites from Chile (plus 15 unapproved names) (plus 1 impact crater)
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