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Grove Mountains 090407
Basic information Name: Grove Mountains 090407
     This is an OFFICIAL meteorite name.
Abbreviation: GRV 090407
Observed fall: No
Year found: 2010
Country: Antarctica [Collected by Chinese Antarctic Research Expedition (CARE)]
Mass:help 4.31 g
Meteoritical Bulletin:  MB 105  (2016)  L4-melt breccia
Recommended:  L4-melt breccia    [explanation]

This is 1 of 6 approved meteorites classified as L4-melt breccia.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 5 Dec 2016
Writeup from MB 105:

Grove Mountains 090407 (GRV 090407)        72°46’42.1"S, 75°19’10.9


Find: 23 Jan 2010

Classification: Ordinary chondrite (L4, melt breccia)

Physical characteristics: The specimen is dark black with a surface partially covered by remnant fusion crust.

Petrography: In thin-section, GRV 090407 shows a porphyritic structure. Phenocrysts (~30 vol%) are euhedral to subhedral olivine with an average diameter of 100~200 μm, and remnant chondrules are present. Olivine shows shock effects such as planar deformation fractures and undulatory extinction. In transmitted light, the matrix (~70 vol%) is opaque, and is mainly composed of glass with traces of granular silicates and metal. The granular silicates in the matrix are <50 μm in size, and include mainly low-calcium pyroxene, olivine and feldspar. The other opaque minerals in the matrix are represented by kamacite, taenite, troilite and chromite. With the exception of oxidized metallic veins developed along fractures, the metal is dispersed in circular droplets (previously molten) between 5 and 30 μm. The GRV 090407 is a breccia with melted matrix.

Geochemistry: The minerals have uniform chemical compositions, with an olivine (phenocrysts and granular matrix) composition of Fa23.52±0.19, pyroxene of Fs23.52±0.19Wo1.49±0.11. The compositional characteristics of olivine and low calcium pyroxene are consistent with the L group.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Ice field
Date:23 Jan 2010
Mass (g):4.31
Class:L4-melt breccia
Weathering grade:W2
Fayalite (mol%):23.52±0.19 (n=11)
Ferrosilite (mol%):19.99±0.33 (n=11)
Wollastonite (mol%):1.49±0.11 (n=11)
Classifier:B. Miao, Z. Xia, L. Xie, C.Zhang, L. Huang, J. Zhu, Y. Xue, Y. Hu, GUT
Type spec mass (g):4.31
Type spec location:PRIC
Main mass:PRIC
Comments:Submitted by Bingkui Miao
   and collections
PRIC: Polar Research Institute of China, 451 Jinqiao Road, Shanghai 200129, China; Website (institutional address; updated 9 Apr 2013)
GUT: College of Earth Sciences, Guilin University of Technology, 12 Jiangan Road, Guilin 541004, China (institutional address; updated 18 Oct 2012)
Search for this meteorite in the Chinese meteorite database (CHINARE):   
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     Recommended::   (72° 46' 42"S, 75° 19' 11"E)

     This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)
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