Mineralogical Magazine 80 5 Lunar basalt chronology, mantle differentiation and Lithos , The source of Proterozoic anorthosite and rapakivi granite

The REE distribution pattern of lunar anorthosites, relative to ordinary chondrites, has a positive Eu anomaly. On the assumption that (i) the lunar composition is

The white rock is a piece of anorthosite, a rock type made up predominantly of the mineral anorthite (a plagioclase feldspar). The sample is known as “the Genesis Rock” as it is the first sample of crystalline pristine anorthosite returned, and helped to confirm the theory that the moon crystallized from a magma ocean. 2015-12-31 · Anorthosite is an intrusive igneous rock formed through the crystallization and accumulation of anorthite within a magma body. It is abundant on the Moon, and lunar anorthosites are believed to have accumulated on top of a magma ocean early in lunar history . A = >98% anorthosite (pure) B = 90-98% anorthosite C = <90% anorthosite Optical maturity index values > 0.6 mean the crater is fresh. Note that Copernicus is not fresh enough to be considered fresh. LPOD Articles.

Anorthosite moon

Our recent investigations of feldspathic lunar meteorites revealed that such pure anorthosite rock samples occur as common lithic clasts in 20 Sep 2018 Anorthosite is an intrusive igneous rock composed mainly of silicates of volatile materials in Earth anorthosite and Moon anorthosite allow us It was collected from the rim of Spur Crater and given the name 'Genesis Rock' by the astronauts of Apollo 15. They had been looking for evidence of the Moon's anorthosite – A rock consisting mainly of anorthite. Lunar Rocks – Breccias. Pieces of Apollo 16 anorthosite sample 60025. This particular sample is nearly pure Early calculations of the expected anorthosite content of the lunar highlands crust did not match initial measurements of Apollo samples, and more recently have Lunar anorthosite is a major rock of the lunar highlands, which formed as a result of plagioclase-floatation in the lunar magma ocean (LMO). Constraints on the 17 Feb 2013 grains in lunar anorthosites thought to sample the primary crust, obtained crystallization of the lunar magma ocean than a dry moon scenario A lunar structural model is proposed in which a 25-kilometer anorthosite crust, produced by magmatic fractionation, floats on denser gabbro. Where early major 1 Mar 2019 Near the lunar surface, the most likely process of spinel formation is rapid crystallization of impact melts of anorthosite + picrite or peridotite Hand specimens of some lunar anorthositic rocks.

T D ACCEPTED MANUSCRIPT 1 Formation of anorthosite on the Moon through magma ocean 2 fractional crystallization 3 4 Tatsuyuki Arai a, Shigenori Maruyama b,* …

Such a magma ocean would produce a flotation crust of plagioclase crystals, or an anorthositic crust. Early calculations of the expected anorthosite content of the lunar highlands crust did not match initial measurements of Apollo samples, and more recently have The anorthosite body was formed as an accumulation of plagioclase crystals at the bottom of the magma chamber.

3 May 2020 From Earth, lunar anorthosite is visible as the light-colored, highly reflective parts of the Moon's surface known as the lunar highlands.

It is an Earth rock that can be consi • Anorthosite was prominently represented in rock samples brought back from the Moon, and is important in investigations of Mars, Venus, and meteorites. 16. OCCURRENCE Anorthosite are occurred in different parts of the world. Some of them are listed below: 1.

Typically, calcium-rich anorthosite deposits are small, irregular and contain too many impurities for commercial applications. The White Mountain ore body is geologically massive and homogeneous with no competitors. The only larger anorthosite occurance is on the moon, which is 384,000 km away.
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The physical-chemical aspects of anorthosite formation are investigated, and the early stages of the evolution of the earth and moon are examined on the basis of a comparison of terrestrial and lunar anorthosites.

THE recent report from Houston1 proposed that the lunar highlands may be composed “predominantly” of anorthosite and gabbroic anorthosite. O'Hara has therefore suggested that some of the Pre On the Moon (1) there are no rocks rich in quartz or other silica polymorphs*, (2) in a given rock, particularly breccias, the average concentration of silica in the three main minerals, plagioclase, pyroxene, and olivine, are all about the same, and (3) in highlands rocks ilmenite is usually present only in small amounts (<3%), so silica concentrations of common lunar rocks vary by only a 2013-02-17 · to the Moon through impact events or during mantle overturn as suggested by previous studies7,11. These data are used to estimate the water content of the Moon’s interior at the time of the magma ocean, as well as that of the mare magma source regions. So far, ferroan anorthosite (FAN) is the only available lithology that is Anorthosites, rocks composed almost entirely of plagioclase feldspar, are the oldest rocks on the Moon.

We present a new global survey of the purest anorthosite (PAN) rock using the Spectral Profiler onboard Kaguya. We found that PAN rocks are widely distributed over the Moon, including the Feldspath Anorthosite masses are relatively rare on Earth, and when they occur, they tend to be very old Precambrian rocks. As rare as anorthosite is on our planet, it is extremely abundant on the Moon, being the primary constituent of the lunar crust and the bright-colored lunar highlands. There is a layer of anorthosite in the subsurface of the central peak.
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Recent near-infrared spectra of the Moon have delineated regions where spinel is the only ferromagnesian mineral; the rock is inferred to be spinel anorthosite. One hypothesis is that significant pressure is required for spinel formation; another is that spinel-bearing rocks form by low-pressure assimilation of highlands anorthosite into olivine-rich basaltic (i.e., picritic) magmas.

Spinel-Anorthosites on the Moon: Impact Melt Origins Suggested by Enthalpy Constraints Allan H. Treiman1, Michael J. Kulis2, and Allen F. Glazner3 1 Lunar and Planetary Institute – Universities Space Research Association, 3600 Bay Area Boulevard, Houston, TX 77058. treiman@lpi.usra.edu Anorthosite Anorthosite: Anorthosite: A leucocratic coarse-grained plutonic rock consisting essentially of plagioclase (usually labradorite or bytownite) often with small amounts of pyroxene. Olivine, amphibole, ilmenite, magnetite, and spinel are also sometimes present. The term anorthosite, from Frenc anorthose (term for plagioclase) was coined by Sterry Hunt. Discussion: Initial analyses suggests that the White Mountain anorthosite (aka GreenSpar) would be useful as a mechanical simulant for testing of systems and components bound for the Moon. While quartz is quite rare on the Moon, the abrasiveness of the quartz in GreenSpar may be useful in simulating the abrasiveness of the lunar regolith.