Multi-stage evolution of a sub-aerial volcanic ridge over the last 1.3 Myr: S. Jorge Island, Azores Triple Junction
TLDR
In this paper, K/Ar dating and geochemical analyses have been carried out on the WNW-ESE elongated oceanic island of S. Jorge to reconstruct the volcanic evolution of a linear ridge developed close to the Azores triple junction.About:
This article is published in Earth and Planetary Science Letters.The article was published on 2008-09-15 and is currently open access. It has received 74 citations till now. The article focuses on the topics: Mid-Atlantic Ridge & Mantle plume.read more
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Coastal evolution on volcanic oceanic islands: A complex interplay between volcanism, erosion, sedimentation, sea-level change and biogenic production
Ricardo S. Ramalho,Rui Quartau,Rui Quartau,Alan S. Trenhaile,Neil C. Mitchell,Colin D. Woodroffe,Sérgio P. Ávila +6 more
TL;DR: In this article, the authors review several mechanisms that interact and contribute to the development of coastlines on oceanic island volcanoes, and how these processes evolve throughout the islands' lifetime, showing that during the emergent island stage, surtseyan activity prevails and hydroclastic and pyroclastic structures form; these structures are generally ephemeral because they can be rapidly obliterated by marine erosion.
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Is the ‘Azores Hotspot’ a Wetspot? Insights from the Geochemistry of Fluid and Melt Inclusions in Olivine of Pico Basalts
TL;DR: In this article, He isotope and major, trace and volatile element compositions for basaltic scoriae from five monogenetic cones emplaced along the fissure zone of Pico Island, the youngest island of the Azores archipelago.
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GPS and tectonic evidence for a diffuse plate boundary at the Azores Triple Junction
Fernando O. Marques,Joao P. S. Catalao,Charles DeMets,A.C.G. Costa,A.C.G. Costa,A. Hildenbrand,A. Hildenbrand +6 more
TL;DR: In this paper, the authors use GPS, bathymetric/structural, and seismic data to define the pattern of present deformation along the northern half of the Azores plateau, where the Nubia-Eurasia plate boundary terminates at the axis of the Mid-Atlantic Ridge (MAR).
Reconstructing the architectural evolution of volcanic islands from combined K/Ar, morphologic, tectonic, and magnetic data: the Faial Island example (Azores)
A. Hildenbrand,Fernando O. Marques,A.C.G. Costa,A.L.R. Sibrant,Pedro Silva,B. Henry,Jorge Miguel Miranda,Pedro Madureira +7 more
TL;DR: In this paper, a multi-disciplinary study of the successive stages of development of Faial (Azores) during the last 1 Myr is presented, using high-resolution digital elevation model (DEM), and new K/Ar, tectonic, and magnetic data, in response to complex interactions between volcanic construction and mass wasting, including the development of a graben.
Journal ArticleDOI
Reconstructing the architectural evolution of volcanic islands from combined K/Ar, morphologic, tectonic, and magnetic data: The Faial Island example (Azores)
A. Hildenbrand,Fernando O. Marques,A.C.G. Costa,A.L.R. Sibrant,Pedro Silva,B. Henry,Jorge Miguel Miranda,Pedro Madureira +7 more
TL;DR: In this article, a multi-disciplinary study of the successive stages of development of Faial (Azores) during the last 1 Myr is presented, using high-resolution digital elevation model (DEM), and new K/Ar, tectonic, and magnetic data, in response to complex interactions between volcanic construction and mass wasting, including the development of a graben.
References
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The composition of the Earth
William F. McDonough,Shen-Su Sun +1 more
TL;DR: In this paper, the authors compared the relative abundances of the refractory elements in carbonaceous, ordinary, and enstatite chondritic meteorites and found that the most consistent composition of the Earth's core is derived from the seismic profile and its interpretation, compared with primitive meteorites, and chemical and petrological models of peridotite-basalt melting relationships.
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Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology
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TL;DR: The IUGS Subcommission on Geochronology (FOOTNOTE 4) as discussed by the authors recommended the adoption of a standard set of decay constants and isotopic abundances in isotope geology.
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A Guide to the Chemical Classification of the Common Volcanic Rocks
T. N. Irvine,W. R. A. Baragar +1 more
TL;DR: In this paper, a system was presented whereby volcanic rocks may be classified chemically as follows: Subalkaline Rocks:A.B. Tholeiitic basalt series:Tholeitic picrite-basalt; tholeiite, tholeitic andesite; dacite; rhyolite.
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Convection Plumes in the Lower Mantle
TL;DR: The concept of crustal plate motion over mantle hotspots has been advanced to explain the origin of the Hawaiian and other island chains and the origin the Walvis, Iceland-Farroe and other aseismic ridges as discussed by the authors.
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