Debris from Borealis Basin Formation as the Primary Impactor Population of Late Heavy Bombardment
نویسندگان
چکیده
D. A. Minton, A. P. Jackson, E. Asphaug, C. I. Fassett, J. E. Richardson, Purdue University, Dept. of Earth, Atmospheric & Planetary Sciences, 550 Stadium Mall Dr., West Lafayette, IN 47907, [email protected], School of Earth & Space Exploration, Arizona State University, Tempe, AZ 85287 Department of Astronomy, Mount Holyoke College, South Hadley, MA 010751, Arecibo Observatory, Arecibo, PR 00612
منابع مشابه
Can planetesimals left over from terrestrial planet formation produce the lunar Late Heavy Bombardment?
The lunar Late Heavy Bombardment (LHB) defines a time between ∼3.8 to possibly 4.1 Gy ago when the Nectarian and early-Imbrium basins on the Moon with reasonably well-constrained ages were formed. Some have argued that these basins were produced by a terminal cataclysm that caused a spike in the inner Solar System impactor flux during this interval. Others have suggested the basins were formed ...
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Motivating Problem. The Lunar Late Heavy Bombardment (LHB) defines a time between ∼ 3.8 to possibly 4.1 Gy ago when the basins on the Moon with reasonably well-constrained ages were formed (e.g., Nectaris, Serenitatis, Imbrium, Orientale) [e.g., 1,2]. This topic has been fraught with controversy ever since it was introduced as a means to explain the absence of lunar rocks with isotopic recrysta...
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[1] Impact basin formation is a fundamental process in the evolution of the Moon and records the history of impactors in the early solar system. In order to assess the stratigraphy, sequence, and ages of impact basins and the impactor population as a function of time, we have used topography from the Lunar Orbiter Laser Altimeter (LOLA) on the Lunar Reconnaissance Orbiter (LRO) to measure the s...
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Introduction: Tera et al. [1] first proposed a "terminal cataclysm" or Late Heavy Bombardment (LHB) based on an apparent spike in lunar rock resetting ages; the LHB has more recently been advocated on the basis of a spike in ages of lunar impact melts, or at least an absence of secure impact melt ages prior to 4 Ga [2-5]. Dates for lunar impact basins [6] from Nectaris (3.90-3.92 Ga) to Orienta...
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