Journal ArticleDOI
Os, Sr, Nd, and Pb isotope systematics of southern African peridotite xenoliths: Implications for the chemical evolution of subcontinental mantle
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TLDR
Isotope analyses of Os, Sr, Nd, and Pb elements were caried out on twelve peridotite xenoliths from the Jagersfontein, Letseng-la-terae, Thaba Patsoa, Mothae, and Premier kimberlites of southern Africa, to investigate the timing and the nature of melt extraction from the continental lithosphere and its relation to the continent formation and stabilization.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1989-07-01. It has received 688 citations till now. The article focuses on the topics: Peridotite & Craton.read more
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The geochemical evolution of the continental crust
TL;DR: A survey of the dimensions and composition of the present continental crust is given in this paper, where it is concluded that at least 60% of the crust was emplaced by the late Archean (ca. 2.7 eons).
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Melting of Garnet Peridotite and the Origin of Komatiite and Depleted Lithosphere
TL;DR: In this paper, a pyrolitic GPa from a mantle enriched in SiO2 relative to pyrolite was made from 3 to 7 GPa in piston-cylinder and multi-anvil apparatus.
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Making continental crust
TL;DR: The continental crust has an andesitic bulk composition, which cannot have been produced by the basaltic magmatism that dominates sites of present-day crustal growth as mentioned in this paper.
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Petrology and geochemistry of Camiguin Island, southern Philippines: insights to the source of adakites and other lavas in a complex arc setting
TL;DR: Camiguin is a small volcanic island located 12 km north of Mindanao Island in southern Philippines as mentioned in this paper, which is the most likely source of Camiguin and most CMA magmas is the mantle wedge metasomatized by fluids dehydrated from a subducted slab.
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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.
References
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Journal ArticleDOI
Rhenium-Osmium Isotope Systematics of Carbonaceous Chondrites
Richard J. Walker,John W. Morgan +1 more
TL;DR: The isotopic composition of Semarkona could reflect assembly of isotopically heterogeneous components subsequent to 4.55 billion years ago or Os isotopic heterogeneities in the primordial solar nebula.
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Latter-day origin of diamonds of eclogitic paragenesis
TL;DR: Eclogitic garnet and clinopyroxene inclusions in Premier and Argyle diamonds yield Sm-Nd isochron ages of 1,150 and 1,580 Myr, respectively, compared with host diatreme emplacement ages9,10 of approximately 1,100-1,200 Myr as discussed by the authors.
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Densities of fertile and sterile garnet peridotites
F. R. Boyd,R. H. McCallister +1 more
TL;DR: In this article, the densities of a fertile peridotite (PHN 1611) and a depleted sterile peridotsite(PHN 1569) have been calculated from the cell dimensions of the component minerals, the mineral analyses, and the bulk rock analyses.
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Kimberlite-borne garnet peridotite xenoliths from old enriched subcontinental lithosphere
TL;DR: In this article, high-temperature deformed garnet lherzolite xenoliths from mantle beneath the northern Lesotho margin of the Archaean craton in southern Africa are inferred to have been in internal Nd and Sr isotopic equilibrium at the time of sampling by kimberlite 90 Ma ago.