Journal ArticleDOI
Petrology and geochemistry of lower crustal granulites from the Geronimo Volcanic Field, southeastern Arizona
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Weaver and Tarney as discussed by the authors found that mafic-to-intermediate composition granulite xenoliths (plagioclase + clinopyroxene ± orthopyroxenes ± orthoproxene + K-feldspar ± amphibole) occur in Pliocene to Recent alkali basalts from the Geronimo Volcanic Field (GVF), southeastern Arizona, USA.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1990-12-01. It has received 118 citations till now. The article focuses on the topics: Granulite & Underplating.read more
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Book ChapterDOI
Composition of the Continental Crust
Roberta L. Rudnick,Shan Gao +1 more
TL;DR: In this paper, the present-day composition of the continental crust, the methods employed to derive these estimates, and the implications of continental crust composition for the formation of the continents, Earth differentiation, and its geochemical inventories are discussed.
Journal ArticleDOI
What do experiments tell us about the relative contributions of crust and mantle to the origin of granitic magmas
Journal ArticleDOI
Dehydration-melting of amphibolite at 10 kbar: the effects of temperature and time
Michael B. Wolf,Peter J. Wyllie +1 more
TL;DR: In this article, the authors simulated the dehydration-melting of a natural, low-K, calcic amphibolite (67.4% hornblende, 32.5% anorthite) in piston-cylinder experiments at 10 kbar and 750-1000°C, for 1-9 days.
Journal ArticleDOI
Increasing Eolian Dust Deposition in the Western United States Linked to Human Activity
Jason C. Neff,Ashley P. Ballantyne,G. L. Farmer,Natalie M. Mahowald,Natalie M. Mahowald,Jessica L. Conroy,Christopher C. Landry,Jonathan T. Overpeck,Thomas H. Painter,Corey R. Lawrence,Richard L. Reynolds +10 more
TL;DR: In this article, the accumulation rates and geochemical properties of alpine lake sediments from the western interior United States for the past 5,000 years have been determined and it was shown that dust load levels increased by 500% above the late Holocene average following the increased western settlement of the United States during the nineteenth century.
References
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The continental crust: Its composition and evolution
TL;DR: In this paper, the authors describe the composition of the present upper crust and deal with possible compositions for the total crust and the inferred composition of lower crust, and the question of the uniformity of crustal composition throughout geological time is discussed.
Journal ArticleDOI
Approximation of terrestrial lead isotope evolution by a two-stage model
J.S. Stacey,Jan Kramers +1 more
TL;DR: In this paper, a two-stage model for terrestrial lead isotope evolution is proposed, which permits the age of the earth to be that of the meteorite system and also yields good model ages for samples of all ages.
Journal ArticleDOI
Tectonic setting of basic volcanic rocks determined using trace element analyses
Julian A. Pearce,J.R. Cann +1 more
TL;DR: In this paper, the results of analyses for Ti, Zr, Y, Nb and Sr in over 200 basaltic rocks from different tectonic settings have been used to construct diagrams in which these settings can usually be identified.
Book
Principles of isotope geology
TL;DR: The roots of isotope geology can be found in this paper, where a geology of Neodymium and Strontium in meteorites and Igneous rocks is described.
Journal ArticleDOI
Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization
TL;DR: In this paper, the mass assimilation rate is an arbitrary fraction(r) of the fractional crystallization rate, where r < 1 is a combination of zone refining and fractional scaling.
Related Papers (5)
The composition and petrogenesis of the lower crust: A xenolith study
Roberta L. Rudnick,S. R. Taylor +1 more