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Grapevine Mesa
Basic information Name: Grapevine Mesa
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2021
Country: United States
Mass:help 550 g
Classification
  history:
Recommended:  CBa    [explanation]

This is 1 of 9 approved meteorites classified as CBa.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CB chondrites, CH-CB family, and Metal-rich meteorites
Comments: Approved 15 Dec 2021
Writeuphelp
Writeup from MB 110:

Grapevine Mesa        35°58’54.00"N, 113°59’49.50"W

Arizona, United States

Find: 2021 Feb 6

Classification: Carbonaceous chondrite (CBa)

History: On the 6 February 2021, Todd Parker and Robert Ward were searching for gold with metal detectors on Grapevine Mesa, east of Meadview, Mohave County, Arizona. Parker detected a signal, which turned out to be three pieces weighing 252.5 g of a metal-rich meteorite. Together, they recovered 550.3 g in a 2 × 2 m area.

Physical characteristics: Exterior of the stones are rusty with patches of fusion crust. Interior of a 4 × 4.5 cm slice shows rounded to angular silicate fragments (to 1 cm) hosted by rounded to anhedral metal grains to 0.7 cm. Metal constitutes 69 areal% of the slice. The metal sizes, shapes, and distribution closely resemble that of Bencubbin.

Petrography: A 2 × 1.5 cm polished section shows metal grains composed of micron-sized polycrystalline kamacite containing an abundance of micron-sized troilite blebs and stringers (~1 areal%). Silicates consist of magnesian nonporpyritic silicate fragments with a cataclastic texture. White orange-stained silicate fragments separated by black opaque material hosting sub-mm-sized silicate fragments and rounded troilite and kamacite blebs. Thin terrestrial oxide veins are present around the metal grains.

Geochemistry: Oxygen isotopes (K. Ziegler, UNM): Seven fragments analyzed by laser fluorination gave δ18O = 6.949, 5.840, 4.998, 4.541, 5.968, 5.283; δ17O = 3.467, 2.239, 2.456, 1.485, 2.409, 2.091; Δ17O = -0.202, -0.845, -0.183, -0.913, -0.742, -0.699 (linearized, all per mil, TFL slope = 0.528). Average of the seven analyses gives δ18O = 5.596±8.848, δ17O = 2.358±0.646, Δ17O = -0.597±0.323. EPMA (L. Garvie, ASU): Low Ca pyroxene Fs3.17±0.79Wo1.88±2.62 (n=4), Al2O3 = 0.4 to 3.2, TiO2 = 0.1 to 0.2, and Cr2O3 = 0.4 to 0.7 (all wt%); High Ca pyroxene Fs3.37Wo38.45 (n=1), Al2O3 = 7.9, TiO2 = 1.0, and Cr2O3 = 1.5 (all wt%); Olivine Fa3.67 and 4.71; Metal (wt%) Ni = 7.03±0.70, Co = 0.33±0.04, Cr = 0.20±0.09, and P = 0.33±0.04.

Classification: The meteorite mineralogically matches that of the subgroup A (CBa) Bencubbin-like carbonaceous chondrites. The oxygen isotopes follow on an extension of the current bencubbinite field.

Specimens: Largest mass of 61 g is with Robert RWard. 21 g and a polished mount at ASU.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Arizona
Date:2021 Feb 6
Latitude:35°58'54.00"N
Longitude:113°59'49.50"W
Mass (g):550.3
Pieces:many
Class:CBa
Shock stage:medium
Weathering grade:W2
Classifier:L. Garvie, ASU, K. Ziegler, UNM
Type spec mass (g):21
Type spec location:ASU
Main mass:RWard
Finder:Todd Parker, RWard
Comments:ASU#2167; submitted by L. Garvie
Plots: O isotopes:  
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
RWard: No contact information provided. (private address)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
FRANK THOMPSON   
Public domain photographs:
Laurence Garvie      
Geography:

United States
Coordinates:
     Recommended::   (35° 58' 54"N, 113° 59' 49"W)

Statistics:
     This is 1 of 178 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1888 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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