Journal ArticleDOI
The origin of KREEP
Paul H. Warren,John T. Wasson +1 more
TLDR
The concept of primeval KREEP, a magma residuum hypothetically produced early in lunar history by fractional distillation of the global magma ocean which hypothetically created the lunar crust, is used to explain the origin of Kreky lunar rocks.Abstract:
The concept of 'urKREEP' (primeval KREEP), a magma residuum hypothetically produced early in lunar history by fractional distillation of the global magma ocean which hypothetically created the lunar crust, is used to explain the origin of KREEPy lunar rocks. The incompatible-rich last dregs of the magma ocean left their trace in the form of incompatible patterns that show no relative fractionation from site to site on the moon and that, with the exception of minor fractionals in two pristine clasts, are the same in pristine samples as in breccias. The high concentration on the lunar surface of these urKREEP remnants demands a high efficiency in upward transport of the incompatibles. This transport may have been enhanced by urKREEP's presumably low density and by high temperatures produced by radioactive decay in the K-, U-, and Th-rich residuum.read more
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Theory of the Earth
TL;DR: Theory of the Earth as mentioned in this paper is a theory of the origin, composition, evolution, and evolution of the entire Earth from the perspective of geology, petrology, mineralogy, geochemistry, geodesy, and seismology.
Journal ArticleDOI
Geochemical Consequences of Melt Percolation: The Upper Mantle as a Chromatographic Column
Oded Navon,Edward M. Stolper +1 more
TL;DR: In this article, the authors have modeled aspects of these chemical interactions in terms of fraction exchange processes similar to those operating in simple chromatographic columns and found that the composition of melt emerging from the top of a column gradually evolves from close to the incipient melt of the column matrix toward that of the melt introduced into the base of column.
Journal ArticleDOI
142Nd Evidence for Early (>4.53 Ga) Global Differentiation of the Silicate Earth
Maud Boyet,Richard W. Carlson +1 more
TL;DR: New high-precision samarium-neodymium isotopic data for chondritic meteorites show that their 142Nd/144Nd ratio is 20 parts per million lower than that of most terrestrial rocks, indicating that most (70 to 95%) of Earth's mantle is compositionally similar to the incompatible element–depleted source of mid-ocean ridge basalts.
Journal ArticleDOI
The magma ocean concept and lunar evolution
TL;DR: In this paper, a review of petrological and theoretical studies of the evolution of the moon is presented, and a synthesis of the model of primordial differentiation and its aftereffects is presented.
References
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Journal ArticleDOI
A procedure for geochemical interpretation of terrestrial rare-earth abundance patterns
TL;DR: In this paper, a procedure for geochemical interpretation of rare-earth abundances in rocks and minerals is presented, where the ratio of each rare earth abundance in the sample to the corresponding value in chondritic meteorites (on logarithmic scale) is plotted as a function of atomic number Z.
The geochemical evolution of the moon
Stuart Ross Taylor,P. Jakes +1 more
TL;DR: In this paper, evidence for and implications of homogeneous accretion of the moon are considered, and the composition of the highland crust is calculated based on the Eu anomaly.
Bulk compositions of the moon and earth, estimated from meteorites
R. Ganapathy,Edward Anders +1 more
TL;DR: In this article, the authors calculated the bulk compositions of the earth and moon, based on the assumption that these planets formed by the same processes as chondrites, and found that the earth contains 92% early condensate and 15% carbonaceous, volatile-rich silicate.
Abundances of the 14 rare-earth elements and 12 other trace elements in Apollo 12 samples - Five igneous and one breccia rocks and four soils
P. Rey,R. A. Schmitt,H. Wakita +2 more
TL;DR: For example, rare earth elements and trace elements abundance in Apollo 12 igneous rocks, breccia and lunar soil were found in the Apollo 12 lunar soil as discussed by the authors, showing that the rare earth element and trace element abundance in the lunar soil