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Chainpur-like Chondrites: Primitive Precursors of Ordinary Chondrites?
Science (New York, N.Y.)
|August 5, 1966
Summary
Primitive chondritic meteorites, like Chainpur, may precede ordinary chondrites. Carbonaceous chondrites are likely related but not direct ancestors, with metamorphic processes affecting element fractionation.
Area of Science:
- Cosmic mineralogy
- Planetary science
- Geochemistry
Background:
- Ordinary chondrites represent the most common meteorite class.
- Understanding their origins is key to deciphering early solar system processes.
- Primitive chondrites offer clues to the initial conditions of planetesimal formation.
Purpose of the Study:
- To investigate the potential precursor relationship between primitive chondrites and ordinary chondrites.
- To clarify the role of carbonaceous chondrites in meteorite evolution.
- To explore the impact of metamorphic processes on elemental composition.
Main Methods:
- Comparative analysis of meteorite compositions.
- Examination of evidence supporting meteorite genetic sequences.
- Assessment of element fractionation patterns, specifically indium and iodine.
Main Results:
- Evidence supports Chainpur and similar meteorites as potential precursors to ordinary chondrites.
- Carbonaceous chondrites appear to be collateral relatives, not direct ancestors.
- Metamorphic processes are implicated in the fractionation of elements like indium and iodine.
- Type-II carbonaceous chondrites are identified as more primitive than types I or IIIA.
Conclusions:
- Primitive chondrites are strong candidates for the progenitors of ordinary chondrites.
- The evolutionary path of meteorites involves collateral relationships and metamorphic alteration.
- Further research into carbonaceous chondrite types can illuminate early solar system geochemistry.
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