Shock melting of ordinary chondrite powders and implications for asteroidal regoliths
نویسندگان
چکیده
منابع مشابه
Impact Melting of Ordinary Chondrite Regoliths and the Production of Fine- Grained
Introduction: The detailed study of individual lunar soil grains provides evidence that the major optical properties of the lunar surface are primarily related to the production of fine-grained (< 20 nm, super-paramagnetic) Fe-particles in agglutinitic impact melts and to iron-rich vapor deposits on the surfaces of individual grains [1]. These Fe-rich materials are derived from oxidized species...
متن کاملPost-shock Annealing and Post-annealing Shock: Implications for the Thermal and Shock Histories of Ordinary-chondrite Parent Bodies
A common view of the thermal and shock histories of ordinary-chondrite (OC) parent bodies is that, for the most part, thermal and shock metamorphism were distinguishable and successive events; e.g., the decay of 26 Al heated chon-dritic planetesimals and subsequent impacts produced various shock effects. Although collisions have long been acknowledged as capable of producing significant heating...
متن کاملIdentifying Asteroidal Ordinary Chondrite Assemblages and Petrographic Types from Vnir Spectra
Introduction: Because of a poor understanding of the delivery mechanisms of meteoroids from the asteroid belt, early asteroid spectral investigations often assumed that the abundance of various meteorite types among meteorite falls was approximately proportional to the abundance of such assemblages within the asteroid population. Based on that assumption, it was concluded that a large fraction ...
متن کاملThe Predicted Irradiation Record of Asteroidal Regoliths and The
I INTRODUCTION The existence of regoliths on asteroidal surfaces is supported by recent telescopic observations. On the other hand the constituent grains of gas-rich meteorites have been clearly irradiated as individual grains in both the ancient solar wind (SW) and solar cosmic rays (SCR). This irradiation could have occured within an asteroidal regolith, before the compaction of the grains in...
متن کاملAr-Ar DATING OF SHOCK-MELTED ORDINARY CHONDRITES: CHRONOLOGY OF ASTEROIDAL
Ar-Ar dating of 13 samples from 5 shock-melted ordinary chondrites is used to determine the timing of impacts in the Main Asteroid Belt. Three samples of the H impact melt LAP 02240 have welldefined plateaus at ~3900 Ma, consistent with the “lunar cataclysm” and many other meteorite impact ages. The LL impact melt breccia NWA 1701 records an impact at ~1000 Ma, in which melt was more thoroughly...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2005
ISSN: 1086-9379
DOI: 10.1111/j.1945-5100.2005.tb00404.x