Megaregolith thickness, heat flow, and the bulk composition of the Moon

@article{Rasmussen1985MegaregolithTH,
  title={Megaregolith thickness, heat flow, and the bulk composition of the Moon},
  author={K. Rasmussen and P. H. Warren},
  journal={Nature},
  year={1985},
  volume={313},
  pages={121-124}
}
The Moon's bulk composition is a major constraint on its origin and evolution. Bulk density alone shows that the Moon is depleted in metallic FeNi relative to the Earth or to chondrites with earthlike MgO/FeO ratios (such as H-group chondrites). Depletions of minor-trace volatile elements are also obvious from geochemical data. The simplest assumption would be that the Moon is not much different in terms of nonsiderophile, nonvolatile elements from the silicate portions of the Earth or H… Expand
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References

SHOWING 1-10 OF 17 REFERENCES
The moon: Composition determined by nebular processes
The bulk composition of the Moon was determined by the conditions in the solar nebula during its formation, and may be quantitatively estimated from the premise that the terrestrial planets wereExpand
The composition and origin of the moon.
Many of the properties of the moon, including its “enrichment” in Ca, Al, Ti, U, Th, Ba, Sr and the REE and “depletion” in Fe, Rb, K, Na and other volatiles can be explained by early condensationExpand
Whole planet cooling and the radiogenic heat source contents of the Earth and Moon
It is widely believed that the surface heat flows of the earth and moon provide good measures of the total amounts of radioactives in these bodies. Simple thermal evolution models, based onExpand
Al-Sm-Eu-Sr systematics of eucrites and moon rocks Implications for planetary bulk compositions
Abstract Analysis of the Eu and Sr “anomalies” of eucrites and lunar rocks allows constraints to be placed on the bulk compositions of the eucrite parent body (EPB) and the Moon. The elements Al,Expand
The origin of KREEP
KREEP is a lunar material having very high concentrations of incompatible elements; its name is an acronym for the incompatibles K, rare-earth elements (REE), and P. Although a few pristineExpand
Origin of the Earth and Moon
I Composition and Constitution of the Earth.- 1 The Mantle-Crust System.- 1.1 Principal Subdivisions of the Earth's Interior.- 1.2 The Crust.- 1.3 The Upper Mantle.- 1.4 The Transition Zone.- 1.5 TheExpand
On the heat flow of a gravitationally-differentiated moon of fission origin
It is shown that the mean value for the heat flow of a gravitationally-differentiated Moon of fission origin is about 13 erg cm−2 s−1 and that the heat flow varies regionally from about 3 erg cm−2s−1Expand
Workshop on Pristine Highlands Rocks and the early History of the Moon
Oxide composition of the Moon, evidence for an initially totally molten Moon, geophysical contraints on lunar composition, random sampling of a layered intrusion, lunar highland rocks, earlyExpand
Interpretation of lunar heat flow data
Lunar heat flow observations at the Apollo 15 and 17 sites can be interpreted to imply bulk U concentrations for the Moon of 5 to 8 times those of normal chondrites and 2 to 4 times terrestrialExpand
Seventh Foray - Whitlockite-rich lithologies, a diopside-bearing troctolitic anorthosite, ferroan anorthosites, and KREEP
Seventeen nonmare samples, most of them pristine, are characterized, and implications of the new data are discussed. Five pristine samples are from Apollo 14, near the center of the KREEP-rich zoneExpand
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