Meteorittar – frå rom til jord

Chelyabinsk (tynnslip)

Chelyabinsk impact melt breccia

Klassifisering: Kondritt, LL5, S4, W0
Fall: 15.februar 2013
Land/lokalitet: Russland, Chelyabinsk
Totalmasse: ca 1 tonn

Meteoritical Bulletin Database

Chelyabinsk

TS made in A.P. Karpinsky Russian Geological Research Institute (VSEGEI), St.-Petersburg.

Petrography: (D.D. Badyukov and M.A. Nazarov, Vernad). The majority (2/3) of the stones are composed of a light-colored lithology with a typical chondritic texture. Chondrules (~63%) are readily delineated and set within a fragmental matrix. The mean chondrule diameter is 0.93 mm. The chondrule glass is devitrified. The main phases are olivine and orthopyroxene. Olivine shows mosaicism and planar fractures. Rare grains of augite and clinobronzite are present. Small and rare feldspar grains show undulutory extinction, planar deformation features, and are partly isotropic. Troilite (4 vol.%) and FeNi metal (1.3 vol.%) occur as irregularly shaped grains. Accessory minerals are chromite, ilmenite, and Cl-apatite. A significant portion (1/3) of the stones consist of a dark, fine-grained impact melt containing mineral and chondrule fragments. Feldspar is well developed and practically isotropic. No high-pressure phases were found in the impact melt. There are black-colored thin shock veins in both light and dark lithologies.

First one made from first type (1) of Chelyabinsk -  light-colored lithology with a typical chondritic texture.

Second thin section made from second type (2) of Chelyabinsk meteorite -  dark fine-grained impact melt breccia.

Chelyabinsk

Chelyabinsk

Chelyabinsk

Chelyabinsk