New age measurements of lunar rocks returned by the Apollo space missions have revealed that a surprising number of the rocks show signs of melting about 3. The idea that meteorites have hammered the moon's surface isn't news to scientists. The lunar surface is pock-marked with large craters carved out by the impact of crashing asteroids and meteorites, said Robert Duncan, a professor and associate dean in the College of Oceanic and Atmospheric Sciences at Oregon State University. But the narrow range of the impact dates suggests to researchers that a large spike in meteorite activity took place during a million year interval — possibly the result of collisions in the asteroid belt with comets coming from just beyond our solar system. Results of the study are being published in Geochimica et Cosmochimica Acta, the journal of the international Meteoritical Society.
Lunar rocks radiometric dating - sharegr
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RADIOMETRIC TIME SCALE
By Eugenie Samuel Reich. The grain has helped pinpoint the age at which the molten moon solidified. Lunar zircons were not studied at the time of the Apollo missions because the technology to date them did not exist, says geologist Clive Neal of the University of Notre Dame, Indiana. Until now, the zircon found in lunar rocks was between 3. But many of these lunar grains came from low-lying areas on the moon, where the crust had been resurfaced after being melted by meteorite impacts.
Petrology Tulane University Prof. Stephen A. Nelson Radiometric Dating Prior to the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state. Although we now recognize lots of problems with that calculation, the age of 25 my was accepted by most physicists, but considered too short by most geologists.