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Radiometric dating moon rocks

These mass variants are let isotopes. One teams the rocis depletion of the upcoming moon in alkalis Na, K as Radiometric dating moon rocks Radiometrkc supportive and other volatile booths. Later it was found that available of the overall atoms occurring in a few at any time will go into daughter looks in a presentation time called the touch-life. These rocks apparently form by the site fractional crystallization of magnesian ave or alkali look magmas, although liquid immiscibility may also play a good. Mare basalts[ edit ] Up basalts are able as such because they sure constitute large portions of the upcoming maria.

Most carbon atoms have six protons and six neutrons for a mass of A small percentage of carbon atoms have six protons and six neutrons for a mass of 13 carbon Others have six protons and eight neutrons for a mass of 14 carbon Carbon 12 and carbon 13 are stable isotopes of carbon while carbon 14 is unstable making it useful for dating organic materials. Radiometric Dating The duration of a half-life is unique for each radioactive isotope. Many minerals are formed with small Radiometric dating moon rocks of radioactive isotopes. For example, uranium is a common impurity in the mineral zircon. Most of the potassium atoms in potassium felspars are stable potassium 39, but a small percentage are unstable potassium One half-life after a radioactive isotope is incorporated into a rock there will be only half of the original radioactive parent atoms remaining and an equal number of daughter atoms will have been produced.

The ratio of parent to daughter after one half-life will be 1: After two half-lives, half of the remaining half will decay, leaving one-quarter of the original radioactive parent atoms. Those transformed atoms bring the tally of daughter atoms to three-quarters of the crop of parent plus daughter atoms. The ratio of parent to daughter atoms after two half-lives is therefore 1: Successive half-lives reduce the original parent to one-eighth, one-sixteenth, one-thirty-second, and so on. Primary igneous rocks in the lunar highlands compose three distinct groups: Lunar breccias, formed largely by the immense basin-forming impacts, are dominantly composed of highland lithologies because most mare basalts post-date basin formation and largely fill these impact basins.

The ferroan anorthosite suite is the most common group in the highlands, and is inferred to represent plagioclase flotation cumulates of the lunar magma ocean, with interstitial mafic phases formed from trapped interstitial melt or rafted upwards with the more abundant plagioclase framework. This reflects the extreme depletion of the bulk moon in alkalis Na, K as well as water and other volatile elements.

Ferroan anorthosites have been dated using the internal isochron method at "circa" 4. These rocks Radiomftric later intrusions into the highlands crust ferroan anorthosite at round 4. An interesting aspect of this suite is that analysis of the trace element content of plagioclase and pyroxene require equilibrium with a KREEP -rich magma, despite the refractory major element contents. The alkali suite is so-called because of its high alkali content—for moon rocks. The alkali suite consists of alkali anorthosites with relatively sodic plagioclase Annorites plagioclase-orthopyroxeneand gabbronorites plagioclase-clinopyroxene-orthopyroxene with similar plagioclase compositions and mafic minerals more iron-rich than the magnesian suite.

The alkali suite spans an age range similar to the magnesian suite.

Lunar granites are relatively rare rocks that include dioritesmonzodiorites, and granophyres. They consist of quartz, plagioclase, orthoclase or alkali feldspar, rare mafics pyroxeneand rare zircon. The alkali feldspar may have unusual compositions unlike any terrestrial feldspar, and they are often Ba-rich. These rocks apparently form by the extreme fractional crystallization of magnesian suite or alkali suite magmas, although liquid immiscibility may also play a role.