Mathematics – Logic
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.5909w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, April 10, 1991, p. 5909-5923. Research supported by SNFO and Direktor
Mathematics
Logic
23
Asteroids, Crystallization, Igneous Rocks, Lunar Rocks, Radioactive Age Determination, Regolith, Breccia, Cooling, Neodymium Isotopes, Stratigraphy, Strontium Isotopes, Thermal Conductivity, Moon, Asteroids, Megaregolith, Cooling, Differentiation, Melting, Hed Meteorites, Parent Bodies, Formation, Models, Crystallization, Crust, Depth, Regolith, Debris, Thickness, Isotopes, Neodymium, Strontium, Cumulates, Chronology, Solidification, Age, Temperature, Samples, Lunar, Meteorite, Eucrites, Diogenites, Catalog
Scientific paper
Global cooling of the moon and large (R = 40-250 km) asterodis, was modeled, starting at or near the solidus. A crucial factor in determining the prevailing interval (Ic) of cooling between igenous crystallization and isotopic closure, for any given depth in the crust, is the extent to which the body is insulated by a regolith/megaregolith layer of porous, fragmental impact debris. Given plausible assumptions regarding the thicknesses of such layers on the moon and the eucrite parent asteroid (and regarding the radius of the eucrite asteroid), the results indicate that deep-crustal regions tend to remain above the Nd and Sr isotopic closure temperature for intervals that are long in comparison to the precision of modern Nd- and Sr-based age measurements, and in comparison to suggested chronologic scenarios of global differentiation. Ic intervals of as long as 100 my may be common among available samples of primordial, deep-crustal cumulates from both bodies. Chronologies for the gross solidification of the moon and the eucrite asteroid should allow for the possibility that any single age for a coarse-grained 'plutonic' or cumulate-textured rock might be many tens of millions of years younger than the igneous crystallization age.
Haack Henning
Rasmussen Lars K.
Warren Harry P.
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