Petrogenetic relationship between Allan Hills 77005 and other achondrites

• Main Authors: Mcsween, H. Y., Jr., Taylor, L. A., Stolper, E. M., Muntean, R. A., Okelley, G. D., Eldridge, J. S., Biswas, S., Ngo, H. T., Lipschutz, M. E.
• Format: Other/Unknown Material
• Language: unknown
• Published: 1979
• Subjects: 42; Allan Hills; Antarc*; Antarctica
• Online Access: http://ntrs.nasa.gov/search.jsp?R=19800035999

The paper presents chemical and petrologic data relating the Allan Hills (ALHA) 77005 achondrite from Antarctica and explores their petrogenetic relationship with the shergottites. Petrologic similarities with the latter in terms of mineralogy, oxidation state, inferred source region composition, and shock ages suggest a genetic relationship, also indicated by volatile to involatile element ratios and abundances of other trace elements. ALHA 77005 may be a cumulate crystallized from a liquid parental to materials from which the shergottites crystallized or a sample of peridotite from which shergottite parent liquids were derived. Chemical similarities with terrestrial ultramafic rocks suggest that it provides an additional sample of the only other solar system body with basalt source origins chemically similar to the upper earth mantle.