Sample Petrographic Description
Sample Number | EET 90001 |
Newsletter | 15,1 |
Location | Elephant Moraine |
Field Number | 6383 |
Dimensions (cm) | 3.8 x 3.8 x 2.8 |
Weight (g) | 53.17 |
Original Classification | Carbonaceous C4 |
Updated Classification | CK5 Chondrite |
Pairing | EET 87507; EET 16006; EET 16029; EET 16048; EET 16049; EET 16170; EET 16172; EET 16201; EET 16203; EET 87508; EET 87514; EET 87519; EET 87525; EET 87526; EET 87527; EET 87529; EET 90001; EET 90002; EET 90003; EET 90004; EET 90005; EET 90006; EET 90007; EET 90008; EET 90009; EET 90010; EET 90013; EET 90014; EET 90015; EET 90016; EET 90017; EET 90018; EET 90022; EET 90023; EET 90025; EET 90026; EET 90027; EET 90028; EET 90035; EET 90036; EET 90038; EET 90039; EET 90040; EET 90041; EET 90042; EET 90044; EET 90045; EET 90046; EET 90048; EET 90049; EET 90050; EET 90052; EET 90234; EET 90428; EET 90991; EET 92002; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 29 | |
Weathering | |
Be | |
Fracturing | |
A | |
Macroscopic Description - Robbie Marlow, Cecilia Satterwhite | |
Some fusion crust is present on all of these meteorites, the amount varying from 10% to 95%. The fusion crust is generally thin and black. Traces to abundant amounts of evaporite deposits are present. The deposit is white on most specimens except for 90003 where it has a greenish-blue color similar to that seen on EET90004 and 007. The interior of these Elephant Moraine C4’s is medium gray. Cream-colored inclusions are present as is a small amount of metal. | |
Thin Section Description (,6) - Brian Mason | |
In the original description of the EET90004 group they were classed as C4 chondrites and tentatively paired with the EET 87507 group. Recently Kallemeyn et al. (Geochimica et Cosmochimica Acta, vol. 55, p. 883, 1991) reassigned EET87507 and its paired specimens from type 4 to type 5 "on the basis of their coarse silicate groundmass (50-200 µm) and highly recrystallized, barely discernable chondrules." However, well-defined chondrules are present in the following sections: EET87507,5; 87526,8; 90002,5; 90004,4; 90015,6; 90018,3; 90022,4. In fact, these sections are very similar to those of Karoonda, which is generally accepted as a C4 chondrite. Under these circumstances the original classification of these meteorites as C4 chondrites is retained. | |
Reclassification Notes (AMN 17,1) | |
Re-classified to CK5 according to Kallemeyn, G. W., Rubin, A. E., Wasson, J. T., 1991, The compositional classification of chondrites: V. The Karoonda (CK) group of carbonaceous chondrites. Geochimica et Cosmochimica Acta, 55, 881-892. |
Antarctic Meteorite Images for Sample EET 90001 | ||||
Thin Section Photo(s) : | ||||