Table 1. Newly Classified Antarctic Meteorites
| Sample Number | Weight (g) | Classification | Weathering |
Fracturing |
%Fa |
%Fs |
Magnetic Susceptibility | |
|---|---|---|---|---|---|---|---|---|
| DOM 18220 | 13.7 | L6 CHONDRITE | C | B/C | 25 | 21 | 4.670 | |
| DOM 18221 | 9.4 | L6 CHONDRITE | B/C | B | 25 | 20 | 4.630 | |
| DOM 18222 | 13.2 | H5 CHONDRITE | B/C | B | 19 | 17 | 5.000 | |
| DOM 18223 | 16.1 | L5 CHONDRITE | C | B | 25 | 20 | 4.830 | |
| DOM 18224 | 8.6 | L MELT BRECCIA | C | A/B | 24 | 21 | 4.540 | |
| DOM 18225 | 32.0 | L5 CHONDRITE | B | B | 26 | 21 | 4.740 | |
| DOM 18226 | 24.0 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.520 | |
| DOM 18227 | 13.2 | L5 CHONDRITE | B | A/B | 26 | 20 | 4.550 | |
| DOM 18228 | 39.2 | L5 CHONDRITE | B/C | B/C | 26 | 21 | 4.620 | |
| DOM 18229 | 29.7 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 5.070 | |
| DOM 18400 | 7.4 | H6 CHONDRITE | B | A | 19 | 5.140 | ||
| DOM 18401 | 14.9 | L5 CHONDRITE | B | B | 26 | 20 | 4.670 | |
| DOM 18402 | 12.9 | H6 CHONDRITE | B | A | 20 | 18 | 5.070 | |
| DOM 18403 | 10.7 | L5 CHONDRITE | B | B | 25 | 20 | 4.620 | |
| DOM 18404 | 6.1 | L6 CHONDRITE | B/Ce | B/C | 25 | 21 | 4.510 | |
| DOM 18405 | 7.5 | H3.8 CHONDRITE | B | A | 17-33 | 8-18 | 4.980 | |
| DOM 18406 | 10.4 | L5 CHONDRITE | B | A/B | 25 | 21 | 4.590 | |
| DOM 18407 | 8.6 | H6 CHONDRITE | B/C | A | 20 | 17 | 5.210 | |
| DOM 18408 | 11.6 | L6 CHONDRITE | B/C | A/B | 25 | 21 | 4.610 | |
| DOM 18409 | 8.2 | L5 CHONDRITE | Be | A/B | 25 | 20 | 4.560 | |
| DOM 18410 | 7.6 | H6 CHONDRITE | B/C | A/B | 20 | 17 | 4.960 | |
| DOM 18411 | 8.1 | H6 CHONDRITE | B/Ce | B/C | 20 | 17 | 4.840 | |
| DOM 18412 | 15.6 | L5 CHONDRITE | A/B | A/B | 25 | 21 | 4.650 | |
| DOM 18413 | 21.1 | L6 CHONDRITE | B | B | 25 | 21 | 4.620 | |
| DOM 18414 | 7.6 | L5 CHONDRITE | B | A/B | 25 | 21 | 4.690 | |
| DOM 18415 | 6.7 | L5 CHONDRITE | B | A/B | 25 | 20 | 4.500 | |
| DOM 18416 | 6.9 | L5 CHONDRITE | B | B | 25 | 20 | 4.220 | |
| DOM 18417 | 12.7 | H4 CHONDRITE | B/C | A/B | 18 | 16 | 4.980 | |
| DOM 18418 | 6.2 | H5 CHONDRITE | B | A/B | 20 | 17 | 5.020 | |
| DOM 18419 | 11.7 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.680 | |
| DOM 18540 | 5.4 | H6 CHONDRITE | B/C | B | 20 | 17 | 5.030 | |
| DOM 18541 | 4.6 | L5 CHONDRITE | B/C | A/B | 26 | 20 | 4.450 | |
| DOM 18542 | 9.5 | L5 CHONDRITE | B | A | 25 | 20 | 4.430 | |
| DOM 18544 | 9.1 | L5 CHONDRITE | B | A | 25 | 20 | 4.480 | |
| DOM 18546 | 2.3 | L6 CHONDRITE | B/C | A/B | 24 | 21 | 4.420 | |
| DOM 18547 | 9.3 | L5 CHONDRITE | B | A | 26 | 20 | 4.480 | |
| DOM 18548 | 12.8 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.340 | |
| DOM 18549 | 8.4 | H5 CHONDRITE | B/C | A | 20 | 16 | 4.810 | |
| DOM 18560 | 1.2 | L5 CHONDRITE | B/C | A/B | 25 | 20 | 4.500 | |
| DOM 18561 | 0.8 | H6 CHONDRITE | B | B | 19 | 17 | 5.010 | |
| DOM 18562 | 1.9 | H6 CHONDRITE | B/C | B | 20 | 18 | 5.010 | |
| DOM 18563 | 1.6 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.490 | |
| DOM 18564 | 3.4 | H6 CHONDRITE | B/C | B | 20 | 18 | 5.090 | |
| DOM 18565 | 3.7 | H5 CHONDRITE | B/C | A | 20 | 17 | 5.210 | |
| DOM 18566 | 7.8 | L5 CHONDRITE | B | A | 25 | 20 | 4.570 | |
| DOM 18569 | 9.5 | L6 CHONDRITE | A/B | A | 25 | 22 | 4.730 | |
| DOM 18590 | 6.9 | L6 CHONDRITE | A/B | A | 25 | 21 | 4.230 | |
| DOM 18591 | 20.2 | L5 CHONDRITE | B | A | 26 | 20 | 4.590 | |
| DOM 18592 | 24.8 | L6 CHONDRITE | B/C | A | 26 | 20 | 4.490 | |
| DOM 18593 | 14.6 | L5 CHONDRITE | B/C | A | 26 | 20 | 4.600 | |
| DOM 18594 | 12.0 | L5 CHONDRITE | B/C | A | 26 | 21 | 4.620 | |
| DOM 18595 | 18.5 | L5 CHONDRITE | B/C | A | 26 | 20 | 4.550 | |
| DOM 18596 | 22.1 | L6 CHONDRITE | B/C | A | 25 | 21 | 4.710 | |
| DOM 18597 | 41.4 | L5 CHONDRITE | B/C | A | 26 | 21 | 4.700 | |
| DOM 18598 | 21.6 | L5 CHONDRITE | B/C | A | 26 | 20 | 4.580 | |
| DOM 18599 | 17.3 | H6 CHONDRITE | B/C | A | 20 | 17 | 5.070 | |
| DOM 18600 | 1.1 | H5 CHONDRITE | B | A/B | 19 | 17 | 5.050 | |
| DOM 18601 | 2.0 | L5 CHONDRITE | B/C | B | 25 | 20 | 4.530 | |
| DOM 18602 | 1.8 | H6 CHONDRITE | B/C | B | 20 | 17 | 5.070 | |
| DOM 18603 | 2.3 | L5 CHONDRITE | B/C | B/C | 26 | 20 | 4.520 | |
| DOM 18604 | 3.6 | L5 CHONDRITE | B/C | B/C | 26 | 21 | 4.590 | |
| DOM 18605 | 1.9 | L5 CHONDRITE | B | A/B | 25 | 21 | 4.510 | |
| DOM 18606 | 5.5 | H5 CHONDRITE | B/C | B | 19 | 16 | 5.070 | |
| DOM 18607 | 12.8 | L6 CHONDRITE | B/C | B/C | 25 | 21 | 4.530 | |
| DOM 18608 | 8.0 | L5 CHONDRITE | B | B | 25 | 20 | 4.630 | |
| DOM 18609 | 13.6 | L5 CHONDRITE | B/C | B/C | 26 | 20 | 4.540 | |
| DOM 18650 | 11.3 | L5 CHONDRITE | B | A/B | 26 | 20 | 4.630 | |
| DOM 18651 | 10.5 | L6 CHONDRITE | B/C | B | 26 | 20 | 4.180 | |
| DOM 18652 | 19.5 | L5 CHONDRITE | A/Be | A/B | 26 | 20 | 4.560 | |
| DOM 18653 | 12.4 | L6 CHONDRITE | Be | B | 25 | 21 | 4.580 | |
| DOM 18654 | 17.6 | L5 CHONDRITE | B | B | 25 | 21 | 4.690 | |
| DOM 18659 | 29.6 | L6 CHONDRITE | A/Be | A/B | 24 | 21 | 4.550 | |
| DOM 18673 | 9.3 | L6 CHONDRITE | B/C | B/C | 25 | 21 | 4.510 | |
| DOM 18674 | 8.5 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.470 | |
| DOM 18675 | 4.3 | L6 CHONDRITE | B/C | A/B | 24 | 20 | 4.660 | |
| DOM 18676 | 6.6 | H4 CHONDRITE | B/C | B | 18 | 16 | 5.210 | |
| DOM 18724 | 15.7 | L6 CHONDRITE | B/Ce | B/C | 25 | 21 | 4.610 | |
| DOM 19019 | 58.5 | CM2 CHONDRITE | Ae | B/C | 1-46 | 1 | 2.770 | |
| DOM 19034 | 59.5 | CO3 CHONDRITE | A/B | A/B | 0-49 | 1-33 | 4.170 | |
| DOM 19035 | 18.5 | CK6 CHONDRITE | A/B | A/B | 32 | 4-27 | 4.650 | |
| DOM 19049 | 34.9 | CO3 CHONDRITE | A/Be | B | 1-56 | 1-2 | 4.750 | |
| DOM 19068 | 3.0 | CO3 CHONDRITE | A/Be | A | 1-44 | 4.780 | ||
| DOM 19069 | 11.6 | CM2 CHONDRITE | B/Ce | B/C | 1-48 | 31 | 4.040 | |
| DOM 19099 | 24.3 | CO3 CHONDRITE | A/Be | A/B | 1-53 | 1-2 | 4.680 | |
| DOM 19117 | 15.9 | UREILITE | A/Be | B | 22 | 19 | 4.360 | |
| DOM 19170 | 32.8 | CO3 CHONDRITE | Be | A/B | 14-25 | 18-22 | 4.780 | |
| DOM 19179 | 30.9 | CO3 CHONDRITE | Be | A/B | 0-60 | 4.800 | ||
| DOM 19340 | 13.8 | L MELT BRECCIA | B | A | 0-53 | 10-35 | 4.190 | |
| DOM 19346 | 326.4 | EUCRITE (BRECCIATED) | A/B | A/B | 20-60 | 3.470 | ||
| GRO 17128 | 38.7 | CO3 CHONDRITE | B | A | 1-51 | 1-7 | 4.740 | |
Classification of achondrites, carbonaceous chondrites and other unusual chondrites was done using electron microprobe analysis. Classification of the ordinary chondrites in Table 1 & 2 was done by Energy Dispersive Spectroscopic (EDS) methods using a Scanning Electron Microscope (SEM). This can include the analysis of several olivine and pyroxene grains to determine the approximate Fayalite and Ferrosilite values of the silicates, grouping them into H, L or LL chondrites. Petrologic types are determined by optical microscopy and are assigned based on the distinctiveness of chondrule boundaries on broken surfaces of a 1-3 g chip. While this technique is suitable for general characterization and delineation of equilibrated ordinary chondrites, those undertaking detailed study of any meteorite classified by optical methods alone should use caution. It is recommended that a polished thin section be requested to accompany any chip and appropriate steps for a more detailed characterization should be undertaken by the user. (Cari Corrigan, Smithsonian Institution) |
||||||||