Hello Listers and Lunar Junkies :) I came across this article about Lunar meteorites and I have to say its a good read on explaining the conditions the inner solar system might have gone through with the help of Lunar meteorite samples. Now all we need is to have a first Lunar meteorite fall and it has be happen around NYC :) preferably Brooklyn while I am walking home from the subway :)
Shawn Alan IMCA 1633 eBay Store http://www.ebay.com/sch/ph0t0phl0w/m.html? http://www.meteoritefalls.com/ AN EXTENDED EPISODE OF EARLY BOMBARDMENT IN THE INNER SOLAR SYSTEM: EVIDENCE FROM LUNAR SAMPLES AND METEORITES. M. D. Norman1,2 and A. A. Nemchin3,1 Research School of Earth Sciences, Australian National University, Canberra ACT 0200 Australia([email protected]), 3Department of Applied Geology, Curtin University of Technology, Perth WA 6845Australia ([email protected]). Introduction: A spike in the flux of asteroid-sizebodies traversing the inner Solar System and impacting the terrestrial planets at 3.9 Ga has become a keystone of recent models describing planetary dynamics [1], the chronology of planetary surfaces [2] and assessments of the potential habitability of early terrestrial environments [3,4]. Lunar samples provided the initial observational data that motivated this idea [5, 6], and the lunar cratering record now serves as a reference frame for the cratering chronology of Mars and inner solar system [7]. The absence of lunar impact melt breccias with ages between ~4.4 and 3.9 Ga has long been cited as evidence favoring a relatively low average impact flux during the interval between planetary accretion and the formation of many if not all of the lunar basins during a relatively brief episoce of late heavy bombardment from ~3.8 to 4.0 Ga [3]. However, large impact events on the Moon with ages ranging from 4.1-4.3 Ga have been inferred from recent dating of lunar zircons [8, 9] from previously unrecognized varieties of lunar impact melt breccias [10, 11], from clasts in fragmental lunar breccias [12] and from metamorphic lunar breccias (granulites) [13]. Here we summarize the lunar sample evidence for pre-cataclysm (i.e. older than 3.9 Ga) impact events on the Moon, and suggest that the basinforming epoch likely spanned a significantly longer period of time than implied by the Cataclysm Hypothesis. http://www.lpi.usra.edu/meetings/earlymars2012/pdf/7051.pdf ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
