Semarkona meteorite: first recorded occurrence of smectite in an ordinary chondrite, and its implications
Journal Article
·
· Geochim. Cosmochim. Acta; (United States)
Semarkona is an unshocked unequilibrated ordinary chondrite. Much of the interchondrule matrix and the mesostases of some chondrules and clasts have been hydrothermally altered. Analyses of altered materials and opaque matrix are presented. Ca and Fe have been redistributed from primary, anhydrous phases into calcite and Na, Fe smectite, respectively. In Semarkona the process possibly requires open system behavior inconsistent with the conventional view of metamorphism of the ordinary chondrites. The low petrologic type previously assigned to Semarkona is the result of retrograde metamorphism, under aqueous conditions, of a higher temperature mineral assemblage. Semarkona, and possibly Bishunpur, should be assigned to petrologic type 2.
- Research Organization:
- British Museum (Natural History), London (England)
- OSTI ID:
- 7252256
- Journal Information:
- Geochim. Cosmochim. Acta; (United States), Journal Name: Geochim. Cosmochim. Acta; (United States) Vol. 51:7; ISSN GCACA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CALCITE
CALCIUM
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
CHONDRITES
CLAYS
COSMOCHEMISTRY
ELEMENTS
GEOLOGY
HYDROTHERMAL ALTERATION
IRON
METALS
METAMORPHISM
METEORITES
MINERALOGY
MINERALS
OXYGEN COMPOUNDS
PETROLOGY
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SMECTITE
SODIUM
STONE METEORITES
TRANSITION ELEMENTS
580400* -- Geochemistry-- (-1989)
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CALCITE
CALCIUM
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMISTRY
CHONDRITES
CLAYS
COSMOCHEMISTRY
ELEMENTS
GEOLOGY
HYDROTHERMAL ALTERATION
IRON
METALS
METAMORPHISM
METEORITES
MINERALOGY
MINERALS
OXYGEN COMPOUNDS
PETROLOGY
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SMECTITE
SODIUM
STONE METEORITES
TRANSITION ELEMENTS