Program News
Curator Comments
Kevin Righter, NASA-JSC
This newsletter reports samples from the 2014, 2015, 2016, and 2017 ANSMET seasons, including the first from the most recent 2017–2018 season to the Grosvenor Mountains and Amundsen Glacier areas.
Reported here are numerous (14) HED meteorites (including several pairing groups), 3 irons, 10 carbonaceous chondrites, a low FeO ordinary chondrite, and two H3.5 chondrites. The eucrites have been assigned pairing groups as best as possible given the macroscopic, microscopic, and mineral compositional data, but should be treated with caution. Any detailed petrologic work on these pairing groups should try to verify or confirm the pairings. New slices of these meteorites might reveal previously unrecognized lithologies or textures, which would than require a revision of the pairing relations.
In addition to the newly classified samples, there are some reclassifications: a) an unusual achondrite DOM 14289 reclassified from a lodranite to a QUE 93148–like ungrouped achondrite with possible affinities with HEDs, and b) over 300 equilibrated ordinary chondrites from the Dominion Range for which our magnetic susceptibility data indicates reclassification. We also report a pairing update for LAP 031047 and LAP 03788.
Updated classification for DOM 14289:
Original classification notes:
This meteorite was examined in a thin section (,2) which contained only silicate material and a thick section (,4) dominated by metal with minor silicates and chromite. As a whole, the meteorite is metal dominated. Silicates are coarse grained, with individual grains reaching up to 3 mm. Pyroxenes exhibit approximately 2 micron scale striations of high birefringence. Chromites reach up to 1.4 mm. The metal exhibits partial swathing kamacite adjacent to silicates and chromite with plessite dominating most of the section. Metal and sulfide inclusions occur within the chromites. Compositionally, olivines are Fa12-13 and pyroxenes are Fs5Wo42-46 and Fs12Wo1. The compositions and texture suggest grouping with the lodranites. However, the metal rich nature of the sample is reminiscent of QUE 93148, which was also originally classified as a lodranite, but may be related to the HEDs or pyroxene pallasites.
Since the time of the original classification, we have obtained oxygen isotope data indicating that this sample is not a lodranite, as originally suggested, but is instead related to QUE 93148. This was also recognized in the original classification notes, and classification as related to QUE 93148 is now favored with the new oxygen data. In addition, the olivine Fe/Mn and Fe/Mg ratios of ~40 and ~0.14, respectively, are also nearly identical to those of olivine in QUE 93148 (Goodrich and Righter, 2000). We thank K. Ziegler for carrying out the oxygen isotope measurements at UNM.
Sample | Mg | date | N | |||
---|---|---|---|---|---|---|
DOM 14289.6 clear | 1.5 | 14-May-18 | 1.682 | 3.590 | -0.214 | 1 |
DOM 14289.6 clear | 1.8 | 14-May-18 | 1.728 | 3.719 | -0.236 | 1 |
DOM 14289.6 dark | 2.7 | 14-May-18 | 1.984 | 4.184 | -0.225 | 1 |
Recommended pairing of LAP 031047 and LAP 03788
As part of an independent study of ordinary chondrites, PI Jon Friedrich carried out a micro CT scan of LAP 03788 and found that it had a nearly identical texture to another LAP chondrite from Wittmann et al. (2011) LAP 031047. Because this texture is unique and these samples were recovered in the same field season we have decided to pair them. Below are the two respective images of slices from the CT scanning (image of LAP 03788 courtesy of J. Friedrich, Fordham Univ., and image of LAP 031047 from Wittmann et al., 2011).
Wittmann, A., Kring, D. A., Friedrich, J. M., Troiano, J., Macke, R. J., Britt, D. T., Swindle, T. D., Weirich, J. R., Rumble III, D., Lasue, J., 2011, H/L chondrite LaPaz Icefield 031047 – A feather of Icarus?, Geochimica et Cosmochimica Acta, 75, 6140–6159, ISSN 0016–7037, http://dx.doi.org/10.1016/j.gca.2011.07.037 .
Reclassification and magnetic susceptibility of Dominion Range samples
Magnetic susceptibility of Dominion Range (DOM) 2008 season samples has been measured and presented below, along with suggested reclassification of equilibrated ordinary chondrites, based on the approach presented in AMN 40, no. 1 (Feb. 2017). There we reported that in a study of ~60 samples from Larkman Nunatak and Dominion Range, all H chondrites had log χ
values > 4.9, and no LL chondrites had log χ values > 4.4. We have reclassified ~325 DOM 08 samples using these ranges as well.
Sample | Weight (g) | AMN Classification | New Classification | Magnetic Susceptibility | Pairing Group | AMN |
---|---|---|---|---|---|---|
DOM 08001 | 1305.4 | Euc Brec | - | 3.47 | 33,1 | |
DOM 08002 | 173.22 | LL (Imp Melt) | - | 3.86 | 33,1 | |
DOM 08003 | 108.98 | CM2 | - | 3.27 | 33,1 | |
DOM 08004 | 294.5 | CO3 | - | 4.89 | DOM 08004 | 32,2 |
DOM 08005 | 88.76 | Euc Brec | - | 3.16 | 32,2 | |
DOM 08006 | 667.3 | CO3 | - | 4.92 | 32,2 | |
DOM 08007 | 24.732 | H5 | - | 4.99 | 33,1 | |
DOM 08008 | 27.07 | Euc Brec | - | 2.8 | 33,1 | |
DOM 08012 | 18.55 | Ureilite | - | 4.87 | 32,2 | |
DOM 08013 | 28.75 | CM2 | - | 3.87 | DOM 08010 | 32,2 |
DOM 08014 | 19.613 | Euc Brec | - | 2.71 | 32,2 | |
DOM 08017 | 1021.1 | L5 | - | 4.85 | 40,1 | |
DOM 08018 | 1447.8 | L6 | - | 4.83 | 40,1 | |
DOM 08019 | 1434.48 | L5 | - | 4.63 | 40,1 | |
DOM 08020 | 1020.6 | L5 | - | 4.84 | 40,1 | |
DOM 08021 | 1009.1 | L5 | - | 4.54 | 40,1 | |
DOM 08022 | 825.3 | LL5 | L5 | 4.89 | 34,1 | |
DOM 08023 | 834.1 | L6 | - | 4.57 | 40,1 | |
DOM 08024 | 912.3 | LL6 | L6 | 4.72 | 34,2 | |
DOM 08025 | 566.1 | L6 | - | 4.44 | 40,1 | |
DOM 08026 | 222.48 | LL6 | L6 | 4.68 | 34,1 | |
DOM 08027 | 240.58 | LL6 | - | 3.29 | 34,2 | |
DOM 08028 | 281.72 | L5 | H5 | 5.1 | 34,2 | |
DOM 08029 | 227.02 | LL5 | - | 4.39 | 34,2 | |
DOM 08030 | 255.3 | L5 | - | 4.88 | 34,2 | |
DOM 08031 | 325.9 | L6 | - | 4.66 | 40,1 | |
DOM 08032 | 212.4 | LL5 | L5 | 4.62 | 34,1 | |
DOM 08033 | 319.7 | LL5 | L5 | 4.99 | 34,1 | |
DOM 08034 | 96.897 | L5 | - | 4.87 | 34,1 | |
DOM 08035 | 251.4 | LL6 | - | 4.26 | 34,1 | |
DOM 08036 | 153.126 | LL6 | L6 | 4.54 | 34,2 | |
DOM 08037 | 172.556 | LL5 | L5 | 4.49 | 34,1 | |
DOM 08038 | 131.332 | LL6 | L6 | 4.5 | 34,1 | |
DOM 08039 | 89.83 | LL6 | - | 4.4 | 34,1 | |
DOM 08040 | 106.713 | LL6 | L6 | 4.61 | 34,1 | |
DOM 08041 | 145.774 | LL5 | L5 | 4.6 | 34,1 | |
DOM 08042 | 125.488 | LL6 | L6 | 4.54 | 34,1 | |
DOM 08043 | 83.45 | LL5 | L5 | 4.57 | 34,1 | |
DOM 08044 | 124.432 | LL6 | H6 | 5.01 | 34,1 | |
DOM 08045 | 82.859 | LL6 | - | 4.34 | 34,1 | |
DOM 08046 | 122.367 | LL5 | L5 | 4.8 | 34,1 | |
DOM 08047 | 78.808 | LL6 | L6 | 4.69 | 34,1 | |
DOM 08048 | 64.815 | LL6 | - | 4.19 | 34,1 | |
DOM 08049 | 70.331 | LL5 | L5 | 4.6 | 34,1 | |
DOM 08050 | 154.162 | LL6 | L6 | 4.55 | 34,1 | |
DOM 08051 | 193.111 | LL5 | L5 | 4.57 | 34,1 | |
DOM 08052 | 88.684 | LL5 | L5 | 4.48 | 34,1 | |
DOM 08053 | 74.637 | LL5 | L5 | 4.58 | 34,1 | |
DOM 08054 | 68.21 | L6 | - | 4.86 | 34,1 | |
DOM 08055 | 44.344 | LL6 | L6 | 4.65 | 34,1 | |
DOM 08056 | 65.944 | LL6 | L6 | 4.62 | 34,1 | |
DOM 08057 | 44.239 | L6 | LL6 | 4.31 | 34,1 | |
DOM 08058 | 54.151 | LL6 | - | 4.36 | 34,1 | |
DOM 08059 | 88.031 | LL6 | L6 | 4.62 | 34,1 | |
DOM 08060 | 49.43 | LL6 | L6 | 4.66 | 34,2 | |
DOM 08061 | 48.43 | L5 | H5 | 4.97 | 34,1 | |
DOM 08062 | 51.57 | LL6 | L6 | 4.64 | 34,1 | |
DOM 08063 | 58.74 | LL6 | L6 | 4.69 | 34,2 | |
DOM 08064 | 39.29 | L5 | H5 | 4.98 | 34,1 | |
DOM 08065 | 56.25 | LL6 | L6 | 4.62 | 34,2 | |
DOM 08066 | 115.57 | LL5 | H5 | 4.98 | 34,1 | |
DOM 08067 | 28.87 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08068 | 19.12 | LL6 | L6 | 4.54 | 34,2 | |
DOM 08069 | 33.98 | LL6 | L6 | 4.65 | 34,2 | |
DOM 08070 | 35.06 | LL6 | L6 | 4.7 | 34,2 | |
DOM 08071 | 23 | L6 | - | 4.49 | 34,2 | |
DOM 08072 | 28.42 | LL6 | L6 | 4.64 | 34,2 | |
DOM 08073 | 25.02 | LL6 | L6 | 4.66 | 34,2 | |
DOM 08074 | 38.7 | LL6 | L6 | 4.61 | 34,2 | |
DOM 08075 | 20.91 | LL6 | L6 | 4.58 | 34,2 | |
DOM 08076 | 16.48 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08077 | 19.43 | LL6 | L6 | 4.58 | 34,1 | |
DOM 08078 | 16.78 | LL6 | L6 | 4.73 | 34,2 | |
DOM 08079 | 12.52 | LL6 | L6 | 4.71 | 34,2 | |
DOM 08080 | 149.856 | LL5 | L5 | 4.49 | 34,1 | |
DOM 08081 | 193.476 | LL5 | L5 | 4.55 | 34,1 | |
DOM 08082 | 255.2 | LL5 | L5 | 4.63 | 34,1 | |
DOM 08083 | 220.108 | LL6 | L6 | 4.52 | 34,1 | |
DOM 08084 | 247.9 | L5 | LL5 | 4.14 | 34,1 | |
DOM 08085 | 10.31 | LL6 | L6 | 4.62 | 34,2 | |
DOM 08086 | 28.77 | LL5 | L5 | 4.66 | 34,2 | |
DOM 08087 | 38.23 | LL5 | H5 | 4.97 | 34,1 | |
DOM 08088 | 34.11 | L5 | H5 | 4.98 | 34,2 | |
DOM 08089 | 53.07 | LL6 | L6 | 4.71 | 34,1 | |
DOM 08090 | 33.88 | LL6 | L6 | 4.68 | 34,1 | |
DOM 08091 | 31.76 | L6 | H6 | 5.02 | 34,2 | |
DOM 08092 | 47.76 | LL6 | L6 | 4.58 | 34,2 | |
DOM 08093 | 24.37 | LL5 | L5 | 4.7 | 34,2 | |
DOM 08094 | 55.76 | L5 | - | 4.6 | 34,2 | |
DOM 08095 | 18 | L5 | - | 4.64 | 34,2 | |
DOM 08096 | 28.07 | LL6 | H6 | 4.95 | 34,1 | |
DOM 08097 | 56.36 | LL6 | L6 | 4.63 | 34,1 | |
DOM 08098 | 21.3 | LL5 | L5 | 4.6 | 34,2 | |
DOM 08099 | 21.24 | L6 | - | 4.71 | 34,2 | |
DOM 08100 | 15.36 | LL6 | L6 | 4.6 | 34,2 | |
DOM 08101 | 22.74 | LL6 | L6 | 4.71 | 34,2 | |
DOM 08102 | 18.86 | LL6 | L6 | 4.43 | 34,2 | |
DOM 08103 | 14.66 | LL5 | H5 | 5 | 34,1 | |
DOM 08104 | 28.84 | LL6 | L6 | 4.57 | 34,1 | |
DOM 08105 | 13.72 | LL6 | L6 | 4.62 | 34,2 | |
DOM 08106 | 16.24 | LL6 | L6 | 4.55 | 34,2 | |
DOM 08107 | 16.94 | LL6 | L6 | 4.72 | 34,2 | |
DOM 08108 | 14.92 | LL6 | L6 | 4.65 | 34,2 | |
DOM 08109 | 23.28 | LL5 | H5 | 4.96 | 34,2 | |
DOM 08110 | 85.99 | L6 | H6 | 5.1 | 34,1 | |
DOM 08111 | 36.29 | L6 | H6 | 4.95 | 34,1 | |
DOM 08112 | 30.793 | LL6 | L6 | 4.51 | 34,1 | |
DOM 08113 | 58.593 | LL6 | L6 | 4.41 | 34,1 | |
DOM 08114 | 27.032 | LL6 | - | 4.12 | 34,1 | |
DOM 08115 | 65.307 | H6 | - | 5.08 | 34,1 | |
DOM 08116 | 95.774 | LL5 | L5 | 4.48 | 34,1 | |
DOM 08117 | 43.898 | H5 | - | 5 | 34,1 | |
DOM 08118 | 102.806 | L5 | - | 4.5 | 34,1 | |
DOM 08119 | 54.746 | LL5 | L5 | 4.48 | 34,1 | |
DOM 08122 | 11.32 | L6 | H6 | 5.15 | 34,2 | |
DOM 08123 | 20.31 | LL6 | L6 | 4.69 | 34,2 | |
DOM 08124 | 18.19 | LL6 | L6 | 4.74 | 34,2 | |
DOM 08125 | 20.88 | L6 | - | 4.62 | 34,2 | |
DOM 08126 | 13.52 | L5 | H5 | 5.33 | 34,2 | |
DOM 08127 | 14.95 | L5 | - | 4.66 | 34,2 | |
DOM 08128 | 18.29 | LL6 | L6 | 4.6 | 34,2 | |
DOM 08129 | 14.24 | LL6 | L6 | 4.5 | 34,2 | |
DOM 08130 | 17.23 | H5 | L5 | 4.7 | 34,2 | |
DOM 08132 | 14.5 | LL6 | L6 | 4.61 | 34,2 | |
DOM 08134 | 14.86 | L5 | H5 | 5.17 | 34,2 | |
DOM 08135 | 12.75 | L5 | - | 4.45 | 34,2 | |
DOM 08136 | 18.82 | H5 | - | 5.09 | 34,2 | |
DOM 08137 | 13.69 | LL6 | H6 | 5.05 | 34,2 | |
DOM 08139 | 21.76 | CO3 | - | 4.82 | DOM 08004 | 34,2 |
DOM 08140 | 39.08 | LL6 | L6 | 4.71 | 34,2 | |
DOM 08141 | 20.35 | LL6 | L6 | 4.67 | 34,2 | |
DOM 08142 | 21.12 | L5 | H5 | 5.14 | 34,2 | |
DOM 08143 | 13.94 | L6 | H6 | 5.12 | 34,2 | |
DOM 08144 | 35.28 | L5 | H5 | 4.98 | 34,2 | |
DOM 08145 | 20.42 | L5 | H5 | 5.26 | 34,2 | |
DOM 08146 | 30 | LL5 | L5 | 4.57 | 34,2 | |
DOM 08147 | 44.11 | LL6 | L6 | 4.52 | 34,2 | |
DOM 08148 | 33.99 | LL6 | L6 | 4.72 | 34,2 | |
DOM 08149 | 43.39 | H6 | - | 5.07 | 34,2 | |
DOM 08150 | 12.155 | LL6 | L6 | 4.69 | 34,2 | |
DOM 08151 | 18.503 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08152 | 17.008 | H5 | L5 | 4.54 | 34,2 | |
DOM 08154 | 10.426 | L5 | - | 4.85 | 34,2 | |
DOM 08155 | 22.17 | LL6 | L6 | 4.58 | 34,2 | |
DOM 08156 | 14.367 | LL6 | L6 | 4.74 | 34,2 | |
DOM 08157 | 19.071 | LL6 | L6 | 4.78 | 34,2 | |
DOM 08159 | 13.823 | L5 | - | 4.63 | 34,2 | |
DOM 08160 | 35.594 | LL6 | L6 | 4.46 | 34,2 | |
DOM 08161 | 18.814 | LL6 | - | 4.26 | 34,2 | |
DOM 08162 | 31.194 | H4 | L4 | 4.63 | 34,2 | |
DOM 08163 | 19.877 | L6 | H6 | 5.08 | 34,2 | |
DOM 08164 | 60.688 | L5 | H5 | 5.11 | 34,2 | |
DOM 08165 | 49.991 | LL6 | L6 | 4.52 | 34,2 | |
DOM 08166 | 38.158 | L6 | H6 | 5.03 | 34,2 | |
DOM 08167 | 37.288 | H5 | - | 4.91 | 34,2 | |
DOM 08168 | 20.418 | L5 | H5 | 5.07 | 34,2 | |
DOM 08169 | 38.486 | L6 | H6 | 4.95 | 34,2 | |
DOM 08170 | 10.98 | LL6 | L6 | 4.63 | 34,2 | |
DOM 08171 | 17.35 | LL6 | L6 | 4.62 | 34,2 | |
DOM 08172 | 38.01 | H6 | L6 | 4.59 | 34,2 | |
DOM 08173 | 15.35 | LL6 | L6 | 4.56 | 34,2 | |
DOM 08174 | 28.38 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08175 | 15.61 | LL6 | L6 | 4.55 | 34,2 | |
DOM 08177 | 31.03 | LL6 | L6 | 4.62 | 34,2 | |
DOM 08178 | 22.45 | LL6 | L6 | 4.71 | 34,2 | |
DOM 08179 | 29.78 | LL6 | L6 | 4.56 | 34,2 | |
DOM 08180 | 22.74 | LL5 | L5 | 4.59 | 34,2 | |
DOM 08181 | 35.24 | LL6 | L6 | 4.57 | 34,2 | |
DOM 08182 | 42.66 | LL5 | L5 | 4.7 | 34,2 | |
DOM 08183 | 28.29 | L6 | - | 4.54 | 34,2 | |
DOM 08184 | 32.79 | LL6 | L6 | 4.6 | 34,2 | |
DOM 08185 | 49.29 | LL6 | L6 | 4.67 | 34,2 | |
DOM 08186 | 74.41 | LL6 | L6 | 4.72 | 34,2 | |
DOM 08187 | 27.89 | LL6 | L6 | 4.67 | 34,2 | |
DOM 08188 | 77.51 | L6 | - | 4.65 | 34,2 | |
DOM 08189 | 30.76 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08190 | 15.46 | LL6 | L6 | 4.61 | 34,2 | |
DOM 08191 | 19.23 | LL6 | L6 | 4.61 | 34,2 | |
DOM 08192 | 23.32 | LL6 | L6 | 4.67 | 34,2 | |
DOM 08193 | 20.2 | LL6 | L6 | 4.54 | 34,2 | |
DOM 08194 | 14.35 | LL6 | L6 | 4.65 | 34,2 | |
DOM 08195 | 40.73 | LL6 | L6 | 4.52 | 34,2 | |
DOM 08196 | 28.33 | L6 | H6 | 4.94 | 34,2 | |
DOM 08197 | 22.55 | LL6 | L6 | 4.66 | 34,2 | |
DOM 08198 | 13.88 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08199 | 21.62 | L5 | H5 | 5.16 | 34,2 | |
DOM 08200 | 15.929 | LL5 | - | 4.26 | 34,1 | |
DOM 08201 | 21.108 | LL5 | L5 | 4.67 | 34,1 | |
DOM 08202 | 21.75 | L5 | - | 4.64 | 34,1 | |
DOM 08203 | 33.172 | LL5 | - | 4.13 | 34,1 | |
DOM 08204 | 24.069 | LL6 | L6 | 4.49 | 34,1 | |
DOM 08205 | 17.656 | LL6 | L6 | 4.49 | 34,1 | |
DOM 08206 | 38.973 | LL6 | L6 | 4.58 | 34,1 | |
DOM 08207 | 22.579 | LL6 | L6 | 4.88 | 34,1 | |
DOM 08208 | 27.053 | LL6 | L6 | 4.6 | 34,1 | |
DOM 08209 | 25.418 | L6 | - | 4.63 | 34,1 | |
DOM 08210 | 15.943 | LL6 | L6 | 4.42 | 34,1 | |
DOM 08211 | 12.62 | LL6 | L6 | 4.63 | 34,1 | |
DOM 08215 | 14.553 | LL6 | L6 | 4.53 | 34,1 | |
DOM 08216 | 13.031 | L6 | - | 4.61 | 34,1 | |
DOM 08217 | 13.35 | LL6 | L6 | 4.8 | 34,1 | |
DOM 08218 | 18.343 | L6 | - | 4.76 | 34,1 | |
DOM 08219 | 21.854 | LL6 | H6 | 4.94 | 34,1 | |
DOM 08221 | 41.19 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08222 | 16.64 | LL6 | L6 | 4.63 | 34,2 | |
DOM 08223 | 21.31 | LL6 | L6 | 4.63 | 34,2 | |
DOM 08224 | 31.56 | L6 | - | 4.67 | 34,2 | |
DOM 08225 | 21.69 | LL6 | L6 | 4.65 | 34,2 | |
DOM 08226 | 21.22 | LL6 | L6 | 4.67 | 34,2 | |
DOM 08227 | 20.36 | L6 | - | 4.69 | 34,2 | |
DOM 08228 | 18.07 | LL6 | L6 | 4.65 | 34,2 | |
DOM 08229 | 11.24 | LL6 | L6 | 4.64 | 34,2 | |
DOM 08230 | 29.612 | LL6 | L6 | 4.53 | 34,1 | |
DOM 08231 | 23.262 | LL6 | L6 | 4.56 | 34,1 | |
DOM 08232 | 20.378 | LL6 | L6 | 4.71 | 34,1 | |
DOM 08233 | 18.884 | LL6 | L6 | 4.71 | 34,1 | |
DOM 08234 | 37.491 | LL5 | L6 | 4.55 | 34,1 | |
DOM 08235 | 25.801 | LL6 | L6 | 4.67 | 34,1 | |
DOM 08236 | 27.559 | H6 | - | 4.95 | 34,1 | |
DOM 08237 | 31.324 | LL6 | L6 | 4.56 | 34,1 | |
DOM 08238 | 29.901 | LL6 | L6 | 4.63 | 34,1 | |
DOM 08239 | 24.191 | H5 | - | 5.15 | 34,1 | |
DOM 08240 | 37.443 | LL6 | - | 4.4 | 34,1 | |
DOM 08241 | 20.557 | LL6 | - | 4.22 | 34,1 | |
DOM 08242 | 25.113 | H6 | L6 | 4.58 | 34,1 | |
DOM 08243 | 43.244 | LL6 | L6 | 4.45 | 34,1 | |
DOM 08244 | 45.384 | LL6 | L6 | 4.44 | 34,1 | |
DOM 08245 | 42.2 | LL6 | L6 | 4.45 | 34,1 | |
DOM 08246 | 42.321 | LL6 | - | 4.34 | 34,1 | |
DOM 08247 | 61.735 | LL6 | L6 | 4.55 | 34,1 | |
DOM 08248 | 32.946 | LL6 | - | 4.33 | 34,1 | |
DOM 08249 | 72.204 | LL5 | L5 | 4.76 | 34,1 | |
DOM 08250 | 22.93 | L6 | - | 4.66 | 34,2 | |
DOM 08251 | 20.01 | LL6 | L6 | 4.65 | 34,2 | |
DOM 08252 | 28.77 | LL6 | L6 | 4.66 | 34,2 | |
DOM 08253 | 37.88 | LL6 | L6 | 4.69 | 34,2 | |
DOM 08254 | 25.51 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08255 | 29.29 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08256 | 78.46 | LL5 | - | 4.17 | 34,2 | |
DOM 08257 | 19.78 | L5 | - | 4.67 | 34,2 | |
DOM 08258 | 48.39 | LL6 | - | 4.35 | 34,2 | |
DOM 08259 | 64.17 | LL6 | L6 | 4.71 | 34,2 | |
DOM 08261 | 22.61 | L6 | - | 4.66 | 34,2 | |
DOM 08262 | 15.01 | LL6 | L6 | 4.66 | 34,2 | |
DOM 08263 | 12.43 | L5 | H5 | 5.03 | 34,2 | |
DOM 08266 | 30.06 | LL6 | L6 | 4.56 | 34,2 | |
DOM 08267 | 19.84 | LL6 | L6 | 4.64 | 34,2 | |
DOM 08268 | 30 | LL6 | L6 | 4.73 | 34,2 | |
DOM 08269 | 29.32 | LL6 | L6 | 4.55 | 34,2 | |
DOM 08270 | 29.52 | LL6 | L6 | 4.51 | 34,2 | |
DOM 08271 | 64.99 | L6 | H6 | 4.98 | 34,2 | |
DOM 08272 | 52.67 | LL6 | - | 4.16 | 34,2 | |
DOM 08273 | 56.6 | LL6 | L6 | 4.77 | 34,2 | |
DOM 08274 | 33.15 | LL6 | L6 | 4.63 | 34,2 | |
DOM 08275 | 60.9 | LL6 | L6 | 4.65 | 34,2 | |
DOM 08276 | 36.8 | LL6 | L6 | 4.66 | 34,2 | |
DOM 08277 | 21.04 | LL6 | L6 | 4.59 | 34,2 | |
DOM 08278 | 83.61 | LL6 | L6 | 4.78 | 34,2 | |
DOM 08279 | 30.85 | LL6 | L6 | 4.46 | 34,2 | |
DOM 08280 | 23.97 | L6 | - | 4.56 | 34,2 | |
DOM 08281 | 15.32 | LL6 | L6 | 4.56 | 34,2 | |
DOM 08282 | 20.81 | LL6 | L6 | 4.61 | 34,2 | |
DOM 08285 | 25.02 | LL6 | L6 | 4.52 | 34,2 | |
DOM 08287 | 12.6 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08288 | 13.99 | L6 | LL6 | 4.31 | 34,2 | |
DOM 08290 | 24.82 | LL6 | L6 | 4.78 | 34,2 | |
DOM 08291 | 28.72 | LL6 | L6 | 4.48 | 34,2 | |
DOM 08292 | 29.17 | LL5 | L5 | 4.63 | 34,2 | |
DOM 08293 | 20.82 | LL6 | L6 | 4.68 | 34,2 | |
DOM 08294 | 28.71 | L6 | - | 4.82 | 34,2 | |
DOM 08295 | 28.51 | H5 | L5 | 4.76 | 34,2 | |
DOM 08296 | 23.7 | L6 | H6 | 5.19 | 34,2 | |
DOM 08297 | 57.09 | LL6 | L6 | 4.69 | 34,2 | |
DOM 08298 | 23.92 | LL6 | L6 | 4.61 | 34,2 | |
DOM 08299 | 22.16 | LL6 | L6 | 4.6 | 34,2 | |
DOM 08302 | 15.61 | L6 | - | 4.66 | 34,2 | |
DOM 08303 | 11.12 | L6 | - | 4.78 | 34,2 | |
DOM 08306 | 13.29 | L6 | - | 4.58 | 34,1 | |
DOM 08312 | 12.87 | LL6 | L6 | 4.6 | 34,1 | |
DOM 08313 | 18.52 | L5 | H5 | 4.91 | 34,2 | |
DOM 08314 | 12.89 | L6 | H6 | 4.91 | 34,2 | |
DOM 08316 | 20.34 | LL6 | L6 | 4.65 | 34,1 | |
DOM 08317 | 28.17 | L6 | H6 | 5.02 | 34,2 | |
DOM 08319 | 19.16 | LL6 | L6 | 4.7 | 34,1 | |
DOM 08321 | 14.1 | LL6 | L6 | 4.6 | 34,1 | |
DOM 08323 | 15.87 | L5 | H5 | 4.96 | 34,2 | |
DOM 08324 | 12.41 | LL6 | L6 | 4.54 | 34,2 | |
DOM 08325 | 18.85 | LL6 | - | 3.98 | 34,1 | |
DOM 08326 | 19.12 | LL6 | L6 | 4.7 | 34,1 | |
DOM 08328 | 19.54 | LL6 | L6 | 4.57 | 34,1 | |
DOM 08330 | 18.04 | L6 | - | 4.64 | 33,2 | |
DOM 08331 | 21.01 | H6 | L6 | 4.89 | 33,2 | |
DOM 08332 | 24.03 | L6 | - | 4.56 | 33,2 | |
DOM 08333 | 35.64 | LL6 | L6 | 4.61 | 33,2 | |
DOM 08334 | 19.76 | LL6 | - | 3.57 | 34,1 | |
DOM 08335 | 30.58 | L6 | - | 4.72 | 34,1 | |
DOM 08336 | 26.11 | LL6 | L6 | 4.78 | 33,2 | |
DOM 08337 | 27.62 | L (Imp Melt) | - | 4.6 | DOM 08397 | 34,1 |
DOM 08338 | 18.98 | L6 | - | 4.8 | 33,2 | |
DOM 08339 | 34.84 | LL6 | L6 | 4.65 | 33,2 | |
DOM 08344 | 11.38 | L6 | H6 | 5.14 | 34,1 | |
DOM 08347 | 10.32 | L6 | H6 | 5.17 | 34,1 | |
DOM 08351 | 26.3 | CO3 | - | 4.88 | DOM 08004 | 34,1 |
DOM 08352 | 14.63 | H6 | LL6 | 4.2 | 33,2 | |
DOM 08353 | 12.68 | L5 | - | 4.65 | 34,1 | |
DOM 08356 | 10.96 | LL6 | L6 | 4.62 | 33,2 | |
DOM 08359 | 21.35 | LL6 | L6 | 4.52 | 33,2 | |
DOM 08360 | 14.61 | L6 | LL6 | 4.35 | 34,2 | |
DOM 08361 | 38.72 | LL6 | L6 | 4.53 | 34,2 | |
DOM 08362 | 19.78 | LL6 | L6 | 4.55 | 34,2 | |
DOM 08363 | 24.29 | LL6 | L6 | 4.67 | 34,2 | |
DOM 08364 | 20.95 | LL5 | L5 | 4.73 | 34,2 | |
DOM 08365 | 18.97 | L6 | - | 4.86 | 34,2 | |
DOM 08366 | 48.73 | L6 | H6 | 5.1 | 34,2 | |
DOM 08367 | 20.93 | H6 | - | 5.28 | 34,2 | |
DOM 08368 | 28.45 | LL6 | L6 | 4.6 | 34,2 | |
DOM 08369 | 18.04 | LL6 | L6 | 4.62 | 34,2 | |
DOM 08390 | 83.27 | H5 | - | 5.1 | 34,1 | |
DOM 08391 | 80.62 | H6 | LL6 | 4.11 | 33,2 | |
DOM 08392 | 79.1 | L6 | - | 4.55 | 34,1 | |
DOM 08393 | 34.17 | LL6 | L6 | 4.68 | 33,2 | |
DOM 08394 | 42.43 | LL6 | L6 | 4.58 | 33,2 | |
DOM 08395 | 53.21 | LL6 | L6 | 4.44 | 33,2 | |
DOM 08396 | 44.79 | LL5 | L5 | 4.76 | 33,2 | |
DOM 08397 | 68.77 | L (Imp Melt) | LL (Imp Melt) | 4.35 | 34,1 | |
DOM 08398 | 59.71 | LL5 | L5 | 4.55 | 33,2 | |
DOM 08399 | 85.5 | L6 | - | 4.66 | 33,2 | |
DOM 08400 | 49.91 | L6 | H6 | 4.94 | 34,2 | |
DOM 08401 | 97.86 | L5 | H5 | 4.93 | 34,2 | |
DOM 08402 | 55.75 | L5 | H5 | 5.08 | 34,2 | |
DOM 08403 | 78.67 | L5 | - | 4.89 | 34,2 | |
DOM 08404 | 70.27 | L6 | H6 | 5.02 | 34,2 | |
DOM 08405 | 92.8 | L5 | H5 | 5.13 | 34,2 | |
DOM 08406 | 45.88 | L5 | H5 | 5.04 | 34,2 | |
DOM 08407 | 115.61 | L6 | H6 | 5.09 | 34,2 | |
DOM 08408 | 71.32 | LL6 | L6 | 4.77 | 34,2 | |
DOM 08409 | 76.49 | LL5 | - | 4.34 | 34,2 | |
DOM 08410 | 29.34 | L6 | H6 | 5.22 | 34,2 | |
DOM 08411 | 47.38 | LL5 | L5 | 4.65 | 33,2 | |
DOM 08412 | 37.65 | LL5 | L5 | 4.74 | 33,2 | |
DOM 08413 | 32.52 | LL5 | L5 | 4.58 | 33,2 | |
DOM 08414 | 41.98 | H6 | - | 5.15 | 33,2 | |
DOM 08415 | 41.96 | L6 | - | 4.48 | 33,2 | |
DOM 08416 | 82.04 | LL5 | L5 | 4.66 | 33,2 | |
DOM 08417 | 31.52 | L6 | - | 4.64 | 33,2 | |
DOM 08418 | 29.61 | L6 | - | 4.65 | 33,2 | |
DOM 08419 | 92.95 | L5 | - | 4.62 | 33,2 | |
DOM 08420 | 54.75 | LL6 | L6 | 4.56 | 34,2 | |
DOM 08421 | 49.06 | LL6 | L6 | 4.66 | 34,2 | |
DOM 08422 | 17.85 | LL6 | L6 | 4.6 | 34,2 | |
DOM 08423 | 24.93 | LL5 | L5 | 4.78 | 34,2 | |
DOM 08424 | 53.09 | LL6 | L6 | 4.7 | 34,2 | |
DOM 08425 | 31.41 | LL6 | L6 | 4.61 | 34,2 | |
DOM 08426 | 24.78 | LL6 | L6 | 4.59 | 34,2 | |
DOM 08427 | 45.01 | LL6 | L6 | 4.58 | 34,2 | |
DOM 08428 | 19.72 | LL6 | L6 | 4.64 | 34,2 | |
DOM 08429 | 23.27 | LL6 | L6 | 4.52 | 34,2 | |
DOM 08430 | 108.68 | LL5 | L5 | 4.71 | 33,2 | |
DOM 08431 | 128.92 | LL6 | L6 | 4.7 | 33,2 | |
DOM 08432 | 59.78 | LL5 | L5 | 4.69 | 33,2 | |
DOM 08433 | 65.88 | LL5 | L5 | 4.65 | 33,2 | |
DOM 08434 | 85.58 | LL6 | L6 | 4.8 | 33,2 | |
DOM 08435 | 60.46 | H6 | - | 4.91 | 33,2 | |
DOM 08436 | 147.27 | LL5 | - | 3.85 | 33,2 | |
DOM 08437 | 45.47 | LL6 | L6 | 4.61 | 33,2 | |
DOM 08438 | 113.07 | LL6 | L6 | 4.76 | 33,2 | |
DOM 08439 | 106.19 | LL6 | L6 | 4.68 | 33,2 | |
DOM 08440 | 29.7 | L5 | - | 4.68 | 34,1 | |
DOM 08441 | 12.74 | L6 | - | 4.67 | 34,1 | |
DOM 08442 | 14.23 | H5 | L5 | 4.66 | 34,1 | |
DOM 08443 | 20.12 | L5 | H5 | 5.05 | 34,1 | |
DOM 08444 | 36.75 | L5 | - | 4.6 | 34,1 | |
DOM 08445 | 12.33 | L6 | - | 4.55 | 34,1 | |
DOM 08446 | 25.81 | L5 | - | 4.64 | 34,1 | |
DOM 08447 | 18.61 | L6 | - | 4.61 | 34,1 | |
DOM 08448 | 57.63 | LL5 | L5 | 4.66 | 34,1 | |
DOM 08449 | 40.54 | LL6 | L6 | 4.62 | 34,1 | |
DOM 08450 | 20.41 | LL5 | L5 | 4.72 | 34,1 | |
DOM 08451 | 11.59 | L6 | - | 4.63 | 34,1 | |
DOM 08453 | 14.89 | L6 | - | 4.74 | 34,1 | |
DOM 08454 | 30.43 | LL5 | L5 | 4.61 | 34,1 | |
DOM 08455 | 18.98 | H6 | - | 5.1 | 34,1 | |
DOM 08456 | 10.71 | H6 | L6 | 4.62 | 34,1 | |
DOM 08457 | 16.95 | LL6 | L6 | 4.73 | 34,1 | |
DOM 08458 | 19.2 | LL6 | L6 | 4.71 | 34,1 | |
DOM 08459 | 21.27 | LL6 | L6 | 4.61 | 34,1 | |
DOM 08460 | 53.41 | LL5 | L5 | 4.68 | 34,1 | |
DOM 08461 | 122.41 | L6 | H6 | 4.97 | 34,1 | |
DOM 08462 | 133.88 | LL5 | L5 | 4.57 | 34,1 | |
DOM 08463 | 160.89 | LL5 | H5 | 4.92 | 34,1 | |
DOM 08464 | 72.6 | L6 | H6 | 4.98 | 34,1 | |
DOM 08465 | 92.5 | L6 | H6 | 5.06 | 34,1 | |
DOM 08466 | 48.68 | LL5 | L5 | 4.65 | 34,1 | |
DOM 08467 | 82.49 | LL5 | L5 | 4.57 | 34,1 | |
DOM 08468 | 64.81 | H3.5 | L3.5 | 4.55 | 34,1 | |
DOM 08469 | 148.79 | LL5 | L5 | 4.69 | 34,1 | |
DOM 08470 | 36.313 | LL6 | L6 | 4.62 | 34,1 | |
DOM 08471 | 31.255 | LL6 | L6 | 4.66 | 34,1 | |
DOM 08472 | 18.503 | LL5 | L5 | 4.56 | 34,1 | |
DOM 08473 | 14.869 | LL5 | L5 | 4.57 | 34,1 | |
DOM 08474 | 17.445 | LL6 | L6 | 4.53 | 34,1 | |
DOM 08475 | 17.927 | L5 | - | 4.48 | 34,1 | |
DOM 08476 | 25.079 | CV3 | - | 3.59 | 34,1 | |
DOM 08477 | 14.539 | LL5 | L5 | 4.7 | 34,1 | |
DOM 08478 | 21.157 | LL5 | L5 | 4.59 | 34,1 | |
DOM 08479 | 11.899 | L6 | - | 4.56 | 34,1 | |
DOM 08480 | 14.45 | H5 | L5 | 4.67 | 34,1 | |
DOM 08482 | 21.4 | LL6 | L6 | 4.5 | 34,1 | |
DOM 08483 | 19.2 | L6 | - | 4.63 | 34,1 | |
DOM 08484 | 22.37 | LL6 | L6 | 4.66 | 34,1 | |
DOM 08485 | 18.31 | LL6 | L6 | 4.54 | 34,1 | |
DOM 08486 | 23.04 | LL6 | L6 | 4.53 | 34,1 | |
DOM 08487 | 25.21 | LL6 | L6 | 4.57 | 34,1 | |
DOM 08488 | 25.21 | LL6 | L6 | 4.65 | 34,1 | |
DOM 08489 | 12.89 | LL5 | L5 | 4.67 | 34,1 | |
DOM 08490 | 18.54 | LL6 | L6 | 4.46 | 34,1 | |
DOM 08491 | 34.47 | L5 | - | 4.63 | 34,1 | |
DOM 08492 | 35.65 | LL6 | L6 | 4.46 | 34,1 | |
DOM 08493 | 22.76 | LL5 | L5 | 4.59 | 34,1 | |
DOM 08494 | 21.19 | L6 | H6 | 5.01 | 34,1 | |
DOM 08495 | 38.06 | H6 | - | 4.96 | 34,1 | |
DOM 08496 | 15.53 | L6 | H6 | 5.03 | 34,1 | |
DOM 08497 | 28.72 | L6 | - | 4.47 | 34,1 | |
DOM 08498 | 16.91 | LL6 | L6 | 4.49 | 34,1 | |
DOM 08499 | 55.38 | LL6 | L6 | 4.6 | 34,1 | |
DOM 08500 | 65.836 | LL6 | L6 | 4.59 | 34,1 | |
DOM 08501 | 68.736 | LL5 | H5 | 5.04 | 34,1 | |
DOM 08502 | 68.757 | LL6 | L6 | 4.56 | 34,1 | |
DOM 08503 | 15.281 | LL6 | - | 4.01 | 34,1 | |
DOM 08504 | 51.177 | LL6 | L6 | 4.47 | 34,1 | |
DOM 08505 | 42.396 | L6 | - | 4.57 | 34,1 | |
DOM 08506 | 48.88 | LL6 | - | 4.16 | 34,1 | |
DOM 08507 | 37.465 | LL6 | - | 4.32 | 34,1 | |
DOM 08508 | 28.471 | L6 | - | 4.54 | 34,1 | |
DOM 08509 | 29.255 | H5 | L5 | 4.64 | 34,1 | |
DOM 08510 | 166.495 | LL6 | - | 4.09 | 33,2 | |
DOM 08511 | 124.851 | LL6 | - | 3.54 | 33,2 | |
DOM 08512 | 208.315 | LL5 | - | 4.37 | 33,2 | |
DOM 08513 | 102.151 | LL5 | L5 | 4.69 | 33,2 | |
DOM 08514 | 67.101 | LL6 | L6 | 4.78 | 33,2 | |
DOM 08515 | 16.188 | LL6 | L6 | 4.71 | 34,1 | |
DOM 08516 | 21.981 | LL6 | L6 | 4.52 | 34,1 | |
DOM 08517 | 28.403 | LL6 | L6 | 4.55 | 34,1 | |
DOM 08518 | 18.932 | LL6 | L6 | 4.71 | 34,1 | |
DOM 08519 | 22.642 | H6 | L6 | 4.89 | 34,1 | |
DOM 08520 | 31.077 | LL6 | L6 | 4.56 | 34,1 | |
DOM 08521 | 15.972 | LL6 | L6 | 4.48 | 34,1 |
Field plan for the 2018-19 ANSMET Field Season
Ralph Harvey, Case Western Reserve University
Jim Karner, University of Utah
We’re sure most readers of this newsletter can appreciate how much planning is involved to get a typical ANSMET season underway. In many cases it can be several years between the time an icefield is targeted in a support proposal to the day that ANSMET boots first set foot on the ice. Usually the six months before a season is when the pace really picks up. Details of the needs of the field party matched to the logistical capabilities of the US Antarctic program, with several rounds of feedback gradually turning plans into achievable reality. There are other cases where logistical issues (ranging from broken airplanes to a broken US Congress) can force planning to start all over from square one with no more than a day or two’s notice. Somehow, (due to either luck, or deep forward thinking, or both) ANSMET has managed to field a team in every austral summer except one since 1976.
That's worth mentioning because for reasons too complicated to be discussed here, detailed planning for the upcoming 2018–19 season is not yet complete. Obviously we’d like everything to be set in stone, but we’re no strangers to uncertainty. So we’ll just keep pushing things as far forward as we can. Currently we plan a return to the icefields surrounding the Davis Nunataks and Mt. Ward, not surprisingly known as "Davis–Ward". Meteorites (designated DOM for the nearby Dominion Range) were first found at this site during a reconnaissance traverse through the upper Beardmore region by Bill Cassidy in 1985. In the 2003–04 season, a recon team visited the area for five days and recovered 89 meteorites, which pointed to the need for a systematic search of the area. Systematic searches in the 2008–09, 2010–11, and 2014–15 seasons yielded another 2000 meteorites. The Davis–Ward area is essentially a broad tongue of ice between two isolated mountains, which are joined by a recessional moraine (Figure 1). Meteorites have been recovered from all parts of the bare ice, but most have been found in either the 100–meter–wide trough that runs along the foot of Mt. Ward, or the moraines that outline the "mitten" (see Fig. 1). The bare ice is often heavy with terrestrial rock, so systematic sweeping can be slow-going. This year our goal is to complete search and recovery work at Davis–Ward; systematically search bare ice where it is warranted and methodically work through what remains of the unsearched moraines surrounding the icefields. If we finish early (and that’s a big if), we will make a snowmobile traverse about 20 nm north to the Main Icefield at the foot of the Dominion Range. The team would spend the rest of the season on search and recovery efforts from the icefields there.
Figure 1. Composite satellite image of the Davis–Ward icefields, with Mt. Ward to the right and Davis Nunataks to the left. The image is oriented with north toward the top. The remaining unsearched areas are about "half the fingers" and "part of the thumb" of the mitten-shaped central icefield.
Report from the Smithsonian
Cari Corrigan, Geologist (Dept. of Mineral Sci.)
Things are rolling along as usual at the Smithsonian. The Hyperprobe is still running beautifully and the SEM is back online, allowing us to use both for classification of Antarctic meteorites. We have secured the funding for two, one-year positions in the Division of Meteorites, and are looking forward to having those folks on board sometime later this fall. We have ordered new cabinets for our meteorite vault in the Museum on the Mall, which will expand our storage capability, provide more workspace and a new display case. Finally, we are very sorry to see our current post doc, Nicole Lunning, move on to the next steps in her career this fall. Nicole has been an amazing asset to our department and she will be missed.