1997/01/01 by Alan E. Rubin · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Astrobiology #Astronomy #Astrophysics and Star Formation Studies #Carbonaceous chondrite #Chondrite #Chondrule #Enstatite #Geochemistry #Geology #Kamacite #Materials science #Metallurgy #Meteorite #Mineral #Mineralogy #Ordinary chondrite #Physics #Planetary Science and Exploration #Regolith #Silicate
paper · pdf · doi:10.1111/j.1945-5100.1997.tb01248.x
openalex publication_date 1997/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/22
Abstract— Hadley Rille is a millimeter‐size EH chondrite containing euhedral and acicular enstatite grains, kamacite globules and preferentially aligned silicate aggregates separated by elongated kamacite‐rich patches. The Hadley Rille chondrite was significantly impact melted when it accreted to the lunar regolith at relative velocities of ∼>3 km s −1 ; ∼65–75% of the chondrules present initially were melted. During the impact, portions of the local regolith were melted and an agglutinate‐like rim formed around the chondritic projectile; the rim consists of flow‐banded vesicular glass, blebs of troilite and low‐Ni metallic Fe, rock fragments, glass(?) shards, and mineral grains. The mineral grains include enstatite (which is otherwise absent from the Moon and must have been derived from the projectile) and poorly characterized, micrometer‐size phases enriched in light rare‐earth‐elements (LREE), which probably formed during the impact. Several of the rock fragments contain <33 mg/g Cl, which was probably derived through impact‐induced volatilization of Cl from chondrule mesostases in the EH projectile.