Sample Petrographic Description
Sample Number | LAP 04527 |
Newsletter | 30,2 |
Location | LaPaz Ice Field |
Field Number | 17697 |
Dimensions (cm) | 1.5 x 1.5 x 0.75 |
Weight (g) | 1.96 |
Original Classification | CM2 Chondrite |
Pairing | LAP 04527; LAP 04588; LAP 04675; LAP 04680; LAP 04760; LAP 04796; LAP 04807; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-60;Ferrosilite (mol%): 1 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exteriors of these paired carbonaceous chondrites have varying amounts of fusion crust (40%-90%) and the colors range from purplish black to brown. The interiors are generally black with some oxidation, most have a powdery texture and contain chondrules of various colors. Varying degrees of oxidation exist in all these meteorites. | |
Thin Section Description (,2) - Tim McCoy, Lauren LaCroix, Linda Welzenbach | |
The meteorites are likely paired and a common description suffices. The sections consist of a few small chondrules (up to 1 mm), mineral grains and CAIs set in a black matrix; rare metal and sulfide grains are present. Olivine compositions are Fa1-61, orthopyroxene is Fs1-42. The meteorites are CM2 chondrites. |
Antarctic Meteorite Images for Sample LAP 04527 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAP04527 | |
Friedrich, J. M., Abreu, N. M., Wolf, S. F., Troiano, J. M., & Stanek, G. L., 2018, Redox-influenced trace element compositional differences among variably aqueously altered CM chondrites. Geochimica et Cosmochimica Acta, 237, 1-17. | |
Rubin, A. E., 2010, Physical properties of chondrules in different chondrite groups: Implications for multiple melting events in dusty environments. Geochimica et Cosmochimica Acta, 74 Issue 16, 15-Aug-10, 4807-4828, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2010.05.018. |