Processing in a transitional environment of CV and CK chondrites’ parent bodies in the light of mineralogical and petrological analysis of NWA 1465 CV3 meteorite

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A. Kereszturi, Sz. Ormandi, S. Jozsa

Planetary and Space Science
available online 3 March 2015
doi:10.1016/j.pss.2015.02.016

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CV and CK chondrites might came form the same parent body from different depth values. To better constrain the conditions there, the composition, structure and chronology of mineral changes were analyzed in NWA 1465 CV3 chondrite meteorite. This sample represents an interesting part of the proposed ancient parent body where opposite to the generally poor altered state of CV3 chondrites, strong mechanical deformation produced elongated chondrules. All of the ingredients in the sample were flattened and fractured. After the chondrules settled down glass formation, opaque crystallization, fracturing and a second opaque generation followed by carbonate crystallization happened.

The lack of fragments along the veins suggests no shearing movement happened, and the small number of weak shock signatures points to S2 level, and the oriented pressure in the parent body might come from burial induced pressure. The meteorite might came from a location in the CV-CK parent body where melting, and weak impact related fracturing and vein filling happened. In this an environment alteration of the primitive material started, possibly from a zone transitional between the shallow, less processed CV, and the deeper, more processed CK chondrites.

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