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Calama 009
Basic information Name: Calama 009
     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 13.5 kg
Classification
  history:
Recommended:  L6    [explanation]

This is 1 of 10991 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 May 2018
Writeuphelp
Writeup from MB 107:

Calama 009        22°24.200’ S, 68°37.632’ W

Antofagasta, Chile

Find: 2017 Oct 13

Classification: Ordinary chondrite (L6)

History: The 13.5 kg meteorite was found 13 October 2017 by the UrFU meteorite expedition-2017 in Chile (Pastukhovich A.Yu., Larionov M.Yu., Kruglikov N.A., Kolunin R.N.) near Chiu-Chiu, Calama region.

Physical characteristics: The meteorite has angular shape. Exterior of the stone is desert polished. The interior of the meteorite is light gray in color with red-brown spots due to Fe-hydroxides around metal and troilite. Fusion crust is present.

Petrography: Classification (V. V. Sharygin, SIGM and UrFU). Petrographic observation of a polished thin section shows very rare chondrules in a coarse recrystallized matrix. Chondrules are very poorly delineated with apparent size to 1 mm. The porphyritic and olivine- or orthopyroxene-barred chondrules are common and mainly consist of olivine, low-Ca-pyroxene and plagioclase, diopside, and ±chromite and blebs of troilite and FeNi-metal. Olivine, low-Ca-pyroxene and plagioclase are main minerals in matrix. Plagioclase grains are larger than 50-100 µm. This indicates a petrological type of 6 for the meteorite. Undulatory extinction, irregular and planar fractures in olivine, as well as the presence of opaque melt pockets and twinning in low-Ca-pyroxene, troilite and ilmenite, indicate a shock stage of S3/4. Majority of grains of FeNi metal (kamacite, taenite, tetrataenite, up to 1.5 mm) and troilite (100-500 µm) are fresh. Weathering products (goethite and other Fe-Ni-hydroxides) occur as in situ partial alteration of FeNi-metals and troilite and fill microfractures in minerals from matrix and chondrules (weathering grade W1/2). Grains of copper (up to 50 µm) are occasionally found in kamacite-taenite-tetrataenite aggregate. Pentlandite (±Ni-rich pyrrhotite, 4.4-6.1 wt.% Ni, up to 10 µm) is rarely observed in troilite. Ni-free pyrrhotite sometimes fills fissures in troilite and seems to be an intermediate phase of troilite alteration to goethite and other Fe-hydroxides. Clinopyroxene, chromite, ilmenite, chlorapatite and merrillite (100-300 µm) occur locally in the matrix. Opaque melt pockets (up to 100 µm) are rarely located near large FeNi-metal grains and contain abundant metal blebs in fine-grained olivine-pyroxene aggregate.

Geochemistry: EDS-WDS analyses (V. V. Sharygin, SIGM and UrFU). The primary chondrite paragenesis includes olivine Fa25.68±0.43 (N=40), orthopyroxene Fs21.46±0.32Wo1.43±0.31 (N=32), plagioclase Ab83.9An10.5Or5.6 (N=25), Cr-bearing clinopyroxene En45.8Fs8.6Wo45.8 (N=2), chromite Crt81.2Spl13.3 (N=11), ilmenite Ilm84.9Gkl12.9 (N=16), chlorapatite, merrillite, FeNi-metals and copper. Chlorapatite contains F (up to 0.9 wt.%); Cl – 5.33 wt.% (N=11). Merrillite is poor in FeO (0.5-0.7 wt.%, N=11). Composition of metals (in wt.%): kamacite (N=22) – Fe 94.38±1.59, Ni – 4.77±1.52, Co – 0.84±0.24; taenite (N=40) – Fe 66.78±3.53, Ni 32.75±3.49, Co 0.42±0.08; tetrataenite (N=16) – Fe 44.65±1.24, Ni 55.07±1.26, Co 0.22±0.05; copper (N=10) – Cu 93.13±0.69, Fe 4.46±0.66, Ni 2.37±0.18.

Classification: Ordinary chondrite. L6, S3/4, W1/2.

Specimens: 12.512 kg at UrFU; 960 g at The Catholic University of the North, Antofagasta, Chile; 19 g and thin section – SIGM.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:limestone deflation plain
Date:2017 Oct 13
Latitude:22°24.200' S
Longitude:68°37.632' W
Mass (g):13500
Pieces:1
Class:L6
Shock stage:S3/4
Weathering grade:W1/2
Fayalite (mol%):25.7±0.4 (N=40)
Ferrosilite (mol%):21.5±0.3 (N=32)
Wollastonite (mol%):1.4±0.3 (N=32)
Classifier:V. V. Sharygin, SIGM and UrFU
Type spec mass (g):12512
Type spec location:UrFU
Main mass:UrFU
Finder:UrFU meteorite expedition - Chile-2017
Comments:Field name KRUG-1; analyst V.V. Sharygin (SIGM and UrFU).; submitted by Victor V. Sharygin, sharygin@igm.nsc.ru
Institutions
   and collections
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015)
SIGM: V.S. Sobolev Institute of Geology and Mineralogy SB RAS, pr. Akademika Koptyuga, 3 Novosibirsk, 630090, Russia; Website (institutional address; updated 10 May 2017)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Photos:
CreditPhotos
Public domain photographs:
Victor V. Sharygin   
Geography:

Chile
Coordinates:
     Recommended::   (22° 24' 12"S, 68° 37' 38"W)

Statistics:
     This is 1 of 1433 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1460 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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