Petrogenesis of Miller Range 07273, a new type of anomalous melt breccia: Implications for impact effects on the H chondrite asteroid

Miller Range 07273 is a chondritic melt breccia that contains clasts of equilibrated ordinary chondrite set in a fine‐grained (3 GPa, possibly to ~15–19 GPa) and temperature (>1350 °C, possibly to ≥2000 °C). The higher pressures and temperatures would have involved back‐reaction of high‐pressure...

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Bibliographic Details
Published in:Meteoritics & planetary science 2017-09, Vol.52 (9), p.1963-1990
Main Authors: Ruzicka, Alex M., Hutson, Melinda, Friedrich, Jon M., Rivers, Mark L., Weisberg, Michael K., Ebel, Denton S., Ziegler, Karen, Rumble, Douglas, Dolan, Alyssa A.
Format: Article
Language:English
Subjects:
Asteroids
Balancing
Breccia
Chondrule
Crystallization
Deformation mechanisms
Heating
High pressure
Igneous rocks
Isotope composition
Isotopes
Melting
Metals
Minerals
Olivine
Oxygen
Petrogenesis
Porosity
Pressure drop
Silicates
Troilite
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Summary:Miller Range 07273 is a chondritic melt breccia that contains clasts of equilibrated ordinary chondrite set in a fine‐grained (3 GPa, possibly to ~15–19 GPa) and temperature (>1350 °C, possibly to ≥2000 °C). The higher pressures and temperatures would have involved back‐reaction of high‐pressure polymorphs to pyroxene and olivine upon cooling. Silicates outside of melt matrix have compositions that were relatively unchanged owing to brief heating duration.
ISSN:1086-9379
1945-5100
DOI:10.1111/maps.12901