Moon dating clasts in polymict breccias

Terada, K. Uranium—lead systematics of phosphates in lunar basaltic regolith breccia, Meteorite Hills Earth and Planetary Science Letters , pp. Here, we report the in-situ U—Pb dating of phosphates in lunar meteorite, Meteorite Hills MET , which is a regolith breccia consisting of low-Ti mare basalt clasts and mineral fragments with a minor anorthositic component. This phosphate formation age, when considered as the crystallisation age of this low-Ti basalt, is similar to crystallization ages of 3. This result reinforces the hypothesis that all these three meteorites originated from the same area on the Moon and were launched by a single impact event, consistent with the similarity of launch ages, mineralogical and geochemical signatures.

Moons of our Solar System

Lunaite – lunar brecciated anorthosite lunar impact melt anorthosite breccia 6. Several hundred rocks that have fallen to Earth as meteorites are demonstrably from the Moon. Numerous rock samples were brought back by the American Apollo missions of the latest s and early s, but those samples are inaccessible except to a few planetary geology researchers. This is a sample from a much-celebrated Moon rock that was found in Africa’s Sahara Desert.

The lithology is a brecciated anorthosite.

Map showing outer mountain rings of major lunar basins, their relative ages, and the extent of their solidated breccias with light clasts dominant over dark ones, with few clasts larger rocks are polymict and contain clasts ranging in shape from angular to pletely certain radiogenic systems used to date the. Apollo

Jillian A. Hudgins, John G. Spray, Christopher D. Hawkes; Element diffusion rates in lunar granulitic breccias: Evidence for contact metamorphism on the Moon. American Mineralogist ; 96 : — They are ubiquitous among lunar samples, but occur in small volumes, typically as clasts in other lunar rocks. We have determined major, minor, and trace element diffusion profiles in olivines, orthopyroxenes, and clinopyroxenes from one Apollo 16 , three Apollo 17 , , , and two paired lunar meteorites NWA and NWA by means of electron microscopy and electron probe microanalysis.

The results show that relic igneous clasts exhibit an absence of, or limited, major element zoning, yet retain minor and trace element profiles. We exploit this characteristic to estimate the duration of high-temperature metamorphism responsible for their recrystallization. To achieve this we have completed pyroxene thermometry, element linescans, X-ray mapping, and modeling of heating and cooling of hanging wall and footwall lithologies juxtaposed with a hot body.

The high equilibration temperatures, moderately high siderophile contents, and time scales of metamorphism of the lunar granulites indicate that they were metamorphosed in relatively near-surface settings.

Moon dating clasts in polymict breccias radio

This is an impact breccia that incorporates fragments from several different lithologies. It consists of a very fine-grained crystalline matrix and fragments ranging from highlands anorthosite to mare basalt. Many of the fragments are themselves breccias. This sample was collected by the Apollo 14 mission to the Fra Mauro crater, on the northeastern margin of Mare Nubium.

The material represents part of the Mare Imbrium ejecta blanket. This low-magnification view shows a dark matrix in which are set a variety of crystal and lithic fragments, including breccias.

indicated by the youngest dated lunar igneous rock. Cohen B.A. () A review of lunar meteorite impact-melt clast compositions and ages (abs). (​a) Lunar polymict breccia A compositional study of its principal components.

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Uranium–lead systematics of phosphates in lunar basaltic regolith breccia, Meteorite Hills 01210

Either your web browser doesn’t support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. We examined lithic breccias from the Apollo sample collection in order to identify ferroan anorthosite samples suitable for geochronology, and better define the age relationships between rocks of the lunar highlands. Clast 3A is a previously unstudied noritic anorthosite from Apollo 16 lithic breccia with textural evidence of slow subsolidus recrystallization.

The ages clearly predate various late accretion scenarios in which an uptick in impacts at 3.

Nevertheless, the U-Pb ages of several zircon grains occurring in lithic clasts in Apollo Keywords: Moon, impact breccias, Apollo missions, impact event, Late Heavy K-Ar, and U-Pb dating of whole rocks from the Apollo 14, 16, and 17 missions On the other hand, polymict breccias consist of different types of material.

Impact melt breccias at the Apollo 17 landing site. Impact melt breccias are by far the most common highland rock type collected on the Apollo 17 mission. They tend to be fine grained, with virtually no clast-free impact melt rocks having been identified. All the highland boulders sampled are impact melt breccia , with the possible exception of one South Massif boulder that might have a friable matrix but nonetheless consists dominantly of impact melt and a shocked igneous norite boulder from the North Massif.

The impact melt breccias were originally described as metaclastic, but their melt origin became apparent as work progressed. Chemical compositions appear to allow natural groupings of the impact melt breccias.

Moons of our Solar System

The Apollo 15 landing site was in the Apennine Highlands, and close to Hadley Rille – a long, narrow winding valley. This paper presents petrologic and compositional studies of matrices and clasts from seven Apollo 15 polymict breccias, which demonstrate the diversity of rock types at the site in comparison with rocks found at other sites. This glass is very rich in the element magnesium, which causes the green color. The fine-grained crystallinity and large holes indicate that this rock crystallized near the top of a molten lava flow.

The dark, flat often circular regions called lunar maria singular form: mare are composed of the rock basalt. Before Apollo, the state of the Moon was a subject of almost unlimited speculation.

Several meteorites are polymict breccias of intermediate composition because of the Apollo collection do not occur as clasts in the feldspathic lunar meteorites. components known to date and was formed by impact melting of pre-existing.

The lunar magma ocean model is a well-established theory of the early evolution of the Moon. By this model, the Moon was initially largely molten and the anorthositic crust that now covers much of the lunar surface directly crystallized from this enormous magma source. We are undertaking a study of the geochemical characteristics of anorthosites from lunar meteorites to test this model. Rare earth and other element abundances have been measured in situ in relict anorthosite clasts from two feldspathic lunar meteorites: Dhofar and Dhofar The rare earth elements were present in abundances of approximately 0.

Comparisons of our data with other lunar meteorites and Apollo samples suggest that there is notable heterogeneity in the trace element abundances of lunar anorthosites, suggesting these samples did not all crystallize from a common magma source.

Formation of ferroan dacite by lunar silicic volcanism recorded in a meteorite from the Moon

Metrics details. An igneous clast from the Northwest Africa NWA clan of lunar meteorites formed by silicic volcanism on the Moon. The silica phases cristobalite, tridymite, and quartz are all present in the clast, indicating rapid cooling at low pressure in agreement with a volcanic setting.

Lunar meteorite ALHA, a lunar highlands breccia, showing a clastic texture​. are composed of a variety of pristine igneous rocks as well as polymict breccias. Among the oldest dated basaltic lunar material are the mare-like clasts in.

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Origin and age of the earliest Martian crust from meteorite NWA 7533

Sample is a clast-rich polymict breccia with a fine-grained microcrystalline matrix. The sample was collected 80 metres from the Lunar Lander Module during the Apollo 14 mission to the Moon and has been dated at 3. The specimen is a composite of soil, rock and mineral fragments welded into a breccia, that was probably part of the Fra Mauro formation, named after the kilometer-diameter crater, and the landing site of the Apollo 14 mission.

In thin section, most of the clasts are microbreccias, although clasts of mare basalt, granite, gabbronorite, anorthosite and troctolite are also present. Several impact events are required to explain the textures observed since the breccia fragments formed in earlier events and were rebrecciated and incorporated in the present rock. The final thermal event produced a melted matrix but it was not hot enough to digest the various lithic clasts.

polymict breccias, we have assumed them to be mixtures containing at least and mafic or basaltic clasts among subsamples and the grain size of the clasts.

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Lunar and Meteorite Sample Disk Program