Journal ArticleDOI
The petrogenesis of Gorgona komatiites, picrites and basalts: new field, petrographic and geochemical constraints
Andrew C. Kerr,Giselle F. Marriner,Nicholas Arndt,John Tarney,Alvaro Nivia,Ad D. Saunders,Robert A. Duncan +6 more
TLDR
Gorgona Island, Colombia is remarkable not only because it contains the only Phanerozoic komatiites, but also because it has mafic to ultramafic lavas with a wide range of compositions, from moderately enriched to extremely depleted (relative to Bulk Earth) as mentioned in this paper.About:
This article is published in Lithos.The article was published on 1996-04-01. It has received 175 citations till now. The article focuses on the topics: Ultramafic rock & Basalt.read more
Citations
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Journal ArticleDOI
Temperatures in Ambient Mantle and Plumes: Constraints from Basalts, Picrites, and Komatiites
Claude Herzberg,Paul D. Asimow,Nicholas Arndt,Yaoling Niu,C. M. Lesher,J. G. Fitton,Michael J. Cheadle,Ad D. Saunders +7 more
TL;DR: In this paper, a new evaluation is made of parental magma compositions that would crystallize olivines with the maximum forsterite contents observed in lava flows, consistent with the plume model.
Journal ArticleDOI
Revised definition of Large Igneous Provinces (LIPs)
TL;DR: In this paper, a revised definition of large Igneous provinces (LIPs) is proposed, which is based on the definition of LIP events from other melting events of the upper mantle, and reassess and revise how we define LIPs.
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Alteration and geochemical patterns in the 3.7–3.8 Ga Isua greenstone belt, West Greenland
Ali Polat,Albrecht W. Hofmann +1 more
TL;DR: The Isua greenstone belt has undergone heterogeneous, poly-phase post-magmatic alteration, resulting in mobilisation of many elements including LREE and Th in contrast, Nb, Ta, Ti, Zr, Y and HREE were relatively immobile during alteration processes as mentioned in this paper.
Journal ArticleDOI
On Archean granites, greenstones, cratons and tectonics: does the evidence demand a verdict?
TL;DR: In this paper, the authors review geologic evidence for Archean plate tectonic processes within the framework of geophysical, geochemical and experimental observations and conclude that the early Archean was not excessively hotter than today.
Journal ArticleDOI
Plume-Associated Ultramafic Magmas of Phanerozoic Age
TL;DR: A parameterization of experimental data in the 0·2-7·0 GPa pressure range constrains both forward models of potential primary ished in models of Phanerozoic hotspot volcanism because magma compositions that exit the melting regime in the mantle and basalt eruptives are more common, and the plume model model model inverse models for computing the effects of olivine fractionation for is subject to debate as mentioned in this paper.
References
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Journal ArticleDOI
Stirring and structure in mantle starting plumes
TL;DR: In this article, an analysis of the effects of entrainment on the structure and dynamics of starting plumes is presented, showing that under conditions appropriate to the earth's mantle large volumes of cooler lower mantle will be stirred into the head of a plume by the time it reaches the top of the mantle if it originates at the coremantle boundary.
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An experimental investigation of olivine morphology
TL;DR: In this paper, it was shown that olivine crystals can adopt ten types of shape, from complete to progressively less complete crystals and from equant habit to elongate bladed habit (c>a≫b) to tabular habit.
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Melting in an Archaean mantle plume: heads it's basalts, tails it's komatiites
TL;DR: In this paper, the authors argue that both the basalts and komatiites are produced by a starting thermal plume rising in a warmer Archaean mantle and show that a starting plume consists of a hot axial jet, capped by a large head into which cooler surrounding mantle is entrained.
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Tectonic Evolution of the Caribbean
TL;DR: The development of the Caribbean is discussed in terms of modern tectonic theory as mentioned in this paper, and the nature of the site on which the Caribbean formed is examined, and the development of rifted margins of the region is described.
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Constraining the potential temperature of the Archaean mantle: A review of the evidence from komatiites
TL;DR: In this paper, it was shown that komatiites can only be formed in hot rising convective jets in the mantle, and that the most magnesian known eruption temperature was at up to 2200°C at pressures of 18 GPa corresponding to a mantle potential temperature of 1900°C.