Jiddat al Harasis 556: A howardite impact melt breccia with an H chondrite component

Nwa 4477 : a Unique Impact Melt Breccia

J. McCoy, R. C. Greenwood, and I. A. Franchi. University of Arizona, Lunar and Planetary Laboratory (LPL), Tucson, AZ 85721, USA, ([email protected]), Dept. Physical Sciences, Kingsborough Community College of the City University of New York, 2001 Oriental Blvd., Brooklyn N.Y. 100235, USA, and the Dept. of Earth and Environmental Sciences, The Graduate Center of CUNY, Dept. Earth and Pla...

Petrography and Metallographic Cooling Rate of H-chondrite Impact Melt

Introduction: Impact melts resulting from craterproducing impacts on asteroids can be used to understand the collisional evolution of our solar system. Part of that analysis includes an assessment of the cooling rates of the impact melts and/or the locations where the melts are deposited. In this study, we examined LAP 04751 [1], which is an impact melt breccia that came from the H-chondrite pa...

Dating Howardite Melt Clasts: Evidence for an Extended Vestan Bombardment?

Lunar Meteorite Dhofar 026: a Shocked Granulitic Breccia, Not an Impact Melt

Introduction: Lunar meteorite Dhofar 026 was previously interpreted as an impact melt [1, 2]. Detailed studies of the rock and comparison to Apollo lunar samples 15418 and 60017 indicate that the rock instead is a shocked, partly melted, granulitic breccia. These studies, presented by [3], are summarized herein. Petrology of Dhofar 026: Most of the rock consists of blocky patches of monomineral...

Clast-rich H-chondrite Impact Melts

Introduction: The H-chondrite parent asteroid provides the second-most abundant type of meteorites that currently reach Earth's surface [1]. These rocks recorded their parent asteroid's collisional history and melted H-chondrites chronicle the most severe cratering events. Samples and Methods: Seven samples of clast-rich impact melt rocks from the La Paz Icefield, Antarctica were analyzed in Pl...