Thermal history, collisional history, and structure of the CK-chondrite parent bodyOPEN ACCESS 

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Alan E. Rubin

MAPS, Version of Record online: 04 October 2026

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“Major chondrite groups (H, L, LL, R, EH, EL, CK) with some members of petrologic type 5 and 6 also have some members of types 3 and 4; they do not have members of type 1 or 2. Their parent bodies had onion-shell structures and were internally heated by the decay of 26Al. These bodies experienced significant thermal metamorphism but only minor aqueous alteration. Major chondrite groups (CI, CM, CV, CR) that have at least some members of petrologic type 1 or 2 have no members of petrologic type 5 or 6. Their parent bodies were subjected to extensive aqueous alteration but little thermal metamorphism. As shown previously, there is a positive correlation between petrologic type and shock stage in ordinary chondrites. Their parent bodies were disrupted and reassembled while still hot; subsequent stochastic collisions caused the exposed hotter materials (i.e., outcrops of higher petrologic types) to develop more-intense shock features. Although CK chondrites encompass the entire range of metamorphic petrologic types (3–6), they exhibit no correlation between petrologic type and shock stage. This may indicate the CK parent body was relatively small, cooled quickly, and was disrupted and reassembled into a rubble pile after it had already cooled down. Stochastic collisions into surface regions that had already cooled down would have resulted in every CK petrologic type developing about the same mean shock stage.”

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