Book contents
- Ordinary Chondrites
- Cambridge Planetary Science
- Ordinary Chondrites
- Copyright page
- Dedication
- Other Books by Alan E. Rubin
- Additional material
- The Fall
- Contents
- Preface
- Introduction
- 1 Approaches to Experimental and Observational Science
- 2 Meteorite Classification
- 3 A Few Essential Definitions
- 4 Ordinary-Chondrite Abundances in Different Mass Ranges
- 5 Asteroids
- 6 Carbonaceous and Noncarbonaceous Materials in the Solar System
- 7 Delivery of Meteorites to the Earth
- 8 Fall Phenomena Icon of a magic wand used to represent editing or enhancement tools.
- 9 Terrestrial Weathering
- 10 Ordinary-Chondrite Groups
- 11 Physical Components of Ordinary Chondrites
- 12 Mineralogy of Ordinary Chondrites
- 13 Parent-Body Processes
- 14 Parent-Body Collisional Histories
- 15 Magnetic Fields in the Solar Nebula
- 16 Ordinary-Chondrite Formation
- Epilogue
- References
- Index
13 - Parent-Body Processes
Published online by Cambridge University Press: 24 February 2026
Book contents
- Ordinary Chondrites
- Cambridge Planetary Science
- Ordinary Chondrites
- Copyright page
- Dedication
- Other Books by Alan E. Rubin
- Additional material
- The Fall
- Contents
- Preface
- Introduction
- 1 Approaches to Experimental and Observational Science
- 2 Meteorite Classification
- 3 A Few Essential Definitions
- 4 Ordinary-Chondrite Abundances in Different Mass Ranges
- 5 Asteroids
- 6 Carbonaceous and Noncarbonaceous Materials in the Solar System
- 7 Delivery of Meteorites to the Earth
- 8 Fall Phenomena Icon of a magic wand used to represent editing or enhancement tools.
- 9 Terrestrial Weathering
- 10 Ordinary-Chondrite Groups
- 11 Physical Components of Ordinary Chondrites
- 12 Mineralogy of Ordinary Chondrites
- 13 Parent-Body Processes
- 14 Parent-Body Collisional Histories
- 15 Magnetic Fields in the Solar Nebula
- 16 Ordinary-Chondrite Formation
- Epilogue
- References
- Index
Summary
Ordinary-chondrite petrologic types range from unheated type-3.00 to highly recrystallized type-6 samples. During metamorphism, olivine grains in ferroan chondrules become depleted in Cr2O3 as Cr2O3 variability decreases. Matrix olivine grains become more ferroan and bulk matrix loses C, metal, and sulfide. Metamorphism induces whole-rock loss of some H2O, C, noble gases, and volatile mobile elements. Type-6 OC contain homogeneous mafic silicates. The maximum metamorphic temperatures in OC ranged from ~200-260ºC for type 3.00 to ~820-930ºC for type 6. Asteroids were heated mainly by 26Al early in Solar System history and by collisions afterwards. Some OC were annealed after shock. Shock also caused microstructural mineral dislocations. Brecciation and melting can occur during collisions. Indigenous water may be mobilized during heating, leading to aqueous alteration of matrix material and chondrule glass. Carbide-magnetite assemblages and fayalite-silica associations are produced during alteration. Some asteroids of OC composition were melted – IVA iron meteorites were derived from the metal core of one such differentiated asteroid.
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- Ordinary ChondritesThe Most Common Meteorites, pp. 263 - 297Publisher: Cambridge University PressPrint publication year: 2026
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