Journal ArticleDOI
Th–Sr–Nd–Pb isotope and trace element evidence for the origin of the São Miguel, Azores, enriched mantle source
TLDR
A suite of young alkali basalts from across the island of Sao Miguel has been analyzed for major and trace element concentrations and Sr, Nd, Pb and Th isotopic compositions in order to document the intra-island variation, and to constrain the processes involved in the formation of the enriched mantle sources of these lavas as mentioned in this paper.About:
This article is published in Chemical Geology.The article was published on 1997-06-15. It has received 109 citations till now. The article focuses on the topics: Trace element & Mantle (geology).read more
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THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY
TL;DR: The Re-Os isotope sytem, based on the long-lived β− transition of 187Re to 187Os, has matured to wide use in cosmochemistry and high-temperature geochemistry as discussed by the authors.
Journal ArticleDOI
Petrology of some oceanic island basalts: PRIMELT2.XLS software for primary magma calculation
Claude Herzberg,Paul D. Asimow +1 more
TL;DR: The PRIMELT2.XLS software as discussed by the authors is an upgrade over a previous version in that it includes garnet peridotite melting and it detects complexities that can lead to overestimates in mantle potential temperature by >100°C.
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Links between long-lived hot spots, mantle plumes, d″, and plate tectonics
A. Mark Jellinek,Michael Manga +1 more
TL;DR: In this article, the authors combine results from new and published observational, analog, theoretical, and numerical studies to address two key questions: (1) Why might mantle plumes in the Earth have a head-tail structure? (2) How can mantle plume and hot spots persist for large geological times?
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Os isotope systematics in the Azores: implications for mantle plume sources
E. Widom,Steven B. Shirey +1 more
TL;DR: In this paper, Os isotopes were measured in 25 Holocene alkali basalts and trachybasalts from 6 islands in the Azores Archipelago, and a relatively limited range in 187 Os 188 Os (0.128-0.137) characterizes the basalts with greater than 20 pg/g Os.
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.
Book
Orogenic Andesites and Plate Tectonics
TL;DR: In this article, the authors define Orogenic Andesite and discuss its properties and properties, including the following: 1.1 Topography, gravity, heat flow, and conductivity.
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A large-scale isotope anomaly in the Southern Hemisphere mantle
TL;DR: The authors showed that the isotopic mantle anomaly is globe-encircling in extent, centred on latitude 30° S. They also showed that this mantle anomaly has been in existence for billions of years and placed severe constraints on mantle convection models.
Book
Introduction to geochemistry
TL;DR: Chemical equilibrium aqueous solutions solution-mineral equilibria - silicates crystal chemistry surface chemistry surfacechemistry surface chemistry - the solutionmineral interface Chemical thermodynamics chemical thermodynamics - phase equilibrium phase equilibrium - oxidation and reduction isotope geochemistry reaction rates and mass transfer the fluid envelopes weathering and soils sedimentation and diagenesis - inorganic geochemistry sedimentation, inorganic sedimentation sedimentation; organic geochemistry metamorphism formation and crystallization of magmas volatiles and magmas hydrothermal ore deposits distribution of the elements historical ge
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Nb and Pb in oceanic basalts: new constraints on mantle evolution
TL;DR: In this paper, the authors proposed a new constraint on mantle composition: the differentiated part of the mantle, chemically depleted after separation of the major portion of the continental crust, was subsequently internally rehomogenized.