Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

MIL 07673

Newsletter

31,2

Location

Miller Range

Field Number

17529

Dimensions (cm)

3.5 x 2.5 x 2.0

Weight (g)

27.19

Original Classification

CO3 Chondrite

Pairing

MIL 07099; MIL 03377; MIL 03442; MIL 05013; MIL 05024; MIL 05104; MIL 07182; MIL 07193; MIL 07265; MIL 07292; MIL 07293; MIL 07295; MIL 07298; MIL 07300; MIL 07302; MIL 07303; MIL 07304; MIL 07306; MIL 07311; MIL 07313; MIL 07315; MIL 07322; MIL 07336; MIL 07338; MIL 07341; MIL 07342; MIL 07343; MIL 07346; MIL 07356; MIL 07357; MIL 07358; MIL 07361; MIL 07368; MIL 07383; MIL 07384; MIL 07389; MIL 07400; MIL 07401; MIL 07407; MIL 07408; MIL 07417; MIL 07418; MIL 07421; MIL 07425; MIL 07439; MIL 07444; MIL 07445; MIL 07459; MIL 07473; MIL 07485; MIL 07505; MIL 07506; MIL 07531; MIL 07546; MIL 07552; MIL 07555; MIL 07560; MIL 07616; MIL 07621; MIL 07626; MIL 07628; MIL 07629; MIL 07631; MIL 07673; MIL 07688; MIL 07695; MIL 07709; MIL 090010; MIL 090019; MIL 090025; MIL 090038; MIL 090117; MIL 090118; MIL 090122; MIL 090128; MIL 090132; MIL 090133; MIL 090134; MIL 090138; MIL 090139; MIL 090152; MIL 090216; MIL 090219; MIL 090227; MIL 090230; MIL 090231; MIL 090233; MIL 090235; MIL 090236; MIL 090264; MIL 090293; MIL 090301; MIL 090308; MIL 090327; MIL 090342; MIL 090343; MIL 090346; MIL 090351; MIL 090392; MIL 090427; MIL 090428; MIL 090437; MIL 090439; MIL 090446; MIL 090451; MIL 090453; MIL 090454; MIL 090457; MIL 090459; MIL 090461; MIL 090462; MIL 090463; MIL 090464; MIL 090465; MIL 090466; MIL 090467; MIL 090468; MIL 090469; MIL 090470; MIL 090473; MIL 090474; MIL 090478; MIL 090480; MIL 090482; MIL 090483; MIL 090485; MIL 090486; MIL 090488; MIL 090514; MIL 090535; MIL 090539; MIL 090543; MIL 090554; MIL 090558; MIL 090588; MIL 090591; MIL 090593; MIL 090594; MIL 090596; MIL 090597; MIL 090598; MIL 090641; MIL 090683; MIL 090686; MIL 090692; MIL 090696; MIL 090699; MIL 090705; MIL 090708; MIL 090710; MIL 090712; MIL 090714; MIL 090716; MIL 090717; MIL 090722; MIL 090723; MIL 090727; MIL 090730; MIL 090785; MIL 090821; MIL 090840; MIL 090890; MIL 090891; MIL 090897; MIL 090907; MIL 090915; MIL 090919; MIL 090955; MIL 090967; MIL 090983; MIL 090988; MIL 090989; MIL 11019; MIL 11050; MIL 11051; MIL 11055; MIL 11057; MIL 11061; MIL 11063; MIL 11101; MIL 11109; MIL 11110; MIL 11116; MIL 11118; MIL 11119; MIL 11120; MIL 11121; MIL 11124; MIL 11130; MIL 11132; MIL 11139; MIL 11140; MIL 11147; MIL 11150; MIL 11152; MIL 11193; MIL 11203; MIL 11213; MIL 11293;

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 1-62;Ferrosilite (mol%): 1-8

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

The exterior is covered with brown/black shiny fusion crust with pits, evaporites and oxidation haloes. The interiors consist of a gray and black matrix with tiny light inclusions.

Thin Section Description (,8) - Tim McCoy, Linda Welzenbach, Cari Corrigan, Rhiannon Mayne

These sections are so similar that a single description suffices. The sections consist of abundant small (up to 1 mm) chondrules, chondrule fragments and mineral grains in a dark matrix. Metal and sulfide occur within and rimming the chondrules. Olivine ranges in composition from Fa_1-62, with a continuous range of intermediate compositions and a slight peak at Fa_20-40. Two pyroxene analyses range from Fs_1-8Wo_2-4. The meteorites are CO3 chondrites.

Notes

The Miller Range (MIL) is the source of over 200 CO3 chondrites. After the 2003-04 and 2005-06 ANSMET seasons, a MIL 03377 pairing group was established with 5 members including the ~ 1.5 kg MIL 05013. Subsequent seasons (2007-08, 2009-10, 2011-12, 2013-14, and 2015-16) recovered many more, most of which were assigned to the large MIL 07099 pairing group. Some focused studies looking at all CO3s in this DCA have revealed that members of the MIL 03377 and MIL 07099 pairing groups have the same CRE age and overlapping Type II chondrule (FeO-rich) Cr2O3 contents. Additionally, Type II chondrule olivine Cr2O3 contents for the two member MIL 07673 pairing group overlaps completely with the other two large groups, and were recovered very closely to many of those samples as well. Given a decade of perspective and all this new information, we have combined the MIL 03377, MIL 07099, and MIL 07673 pairing groups into one (n=199).

Antarctic Meteorite Images for Sample MIL 07673

Field Photo(s) :

ANSMET MIL 07673 - Field Number: 17529, NASA Photo Number: jsc2019e072172

Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah

Antarctic Meteorite Images for Sample MIL 07673

Lab Photo(s) :