Journal ArticleDOI
The geology and geochemistry of Isla Marchena, Galapagos Archipelago: An ocean island adjacent to a mid-ocean ridge
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TLDR
Isla Marchena is the subaerial exposure of a shield volcano located between the Galapagos Platform and the GSC as mentioned in this paper, and the geologic evolution of the island can be divided into two lava series separated by formation of a cadera and a period of explosive activity.About:
This article is published in Journal of Volcanology and Geothermal Research.The article was published on 1990-06-01. It has received 31 citations till now. The article focuses on the topics: Shield volcano & Basalt.read more
Citations
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Young tracks of hotspots and current plate velocities
Alice E. Gripp,Richard G. Gordon +1 more
TL;DR: In this paper, the authors investigated plate motions relative to the hotspots over the past 4 to 7 Myr with a goal of determining the shortest time interval over which reliable volcanic propagation rates and segment trends can be estimated.
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Petrology and geochemistry of the Galápagos Islands: Portrait of a pathological mantle plume
TL;DR: The Galfipagos plume has been observed to experience velocity shear in the uppermost asthenosphere of the Nazca plate with respect to the fixed hotspot reference frame as discussed by the authors.
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The pattern of circumferential and radial eruptive fissures on the volcanoes of Fernandina and Isabela islands, Galapagos
TL;DR: A map of the active shield volcanoes of Fernandina and Isabela islands, Galapagos, made from aerial photographs, displays a distinctive pattern that consists of circumferential eruptive fissures around the summit calderas and radial fissure lower on the flanks.
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Geodynamic evolution of the Galápagos hot spot system (Central East Pacific) over the past 20 m.y.: Constraints from morphology, geochemistry, and magnetic anomalies
TL;DR: In this article, the authors report results of magnetic data from the Nazca Plate and of geochemical analyses of rocks dredged from the Galapagos hot spot tracks (Cocos, Carnegie, Malpelo and Coiba Ridges and adjacent seamounts) in the Central East Pacific.
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Near-primary melt inclusions in anorthite phenocrysts from the Galapagos Platfrom
TL;DR: Partially crystalline melt inclusions in anorthite phenocrysts from a Galapagos seamount have been rehomogenized in a series of heating experiments in order to accurately determine their initial compositions as mentioned in this paper.
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.
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A chemical classification of volcanic rocks based on the total alkali-silica diagram
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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.
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Petrogenetic implications of Ti, Zr, Y, and Nb variations in volcanic rocks
TL;DR: In this paper, a table of mineral-liquid distribution coefficients for Ti, Zr, Y, and Nb for basic, intermediate and acid melt compositions were used to interpret variations of these elements, first in basalts and second during fractional crystallization from basic to acid magmas.
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Olivine-Liquid Equilibrium
Peter L. Roeder,R. F. Emslie +1 more
TL;DR: In this paper, a number of experiments have been conducted in order to study the equilibria between olivine and basaltic liquids and to try and understand the conditions under which OIVINE will crystallize.