Journal ArticleDOI
Insular erosion, isostasy, and subsidence.
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TLDR
The subsidence of islands depends on the size of the is land and the presence of reefs, and it may not always be the same as that of the surrounding oceanic crust.Abstract:
Organic reefs and shore erosion record the intersection of sea level with islands. From this record it is possible to reconstruct the history of vertical movement of the islands and the adjacent deep sea floor, including midplate swells. As judged by coral thickness, islands with barrier reefs sink as though they were on thermally youthful crust regardless of the actual age. Reefless islands do not sink until truncated by erosion. Apparently, thermal subsidence is balanced by isostatic uplift in response to erosion. Barrier reefs prevent wave erosion of encircled volcanoes and capture products of stream erosion so that isostatic uplift is eliminated. Insular shelves widen initially at rates of 0.6 to 1.7 kilometers per million years; the rates decrease with time. Thus the subsidence of islands depends on the size of the is land and the presence of reefs, and it may not always be the same as that of the surrounding oceanic crust.read more
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Observations of flexure and the rheology of oceanic lithosphere
Anthony Watts,Shijie Zhong +1 more
TL;DR: In this article, a multilayered viscoelastic model based on the results of experimental rock mechanics that creep in the lithosphere is a thermally activated process, and on a thermal structure that is given by the plate-cooling model.
Journal ArticleDOI
Geography and history of the Louisville Hotspot Chain in the southwest Pacific
TL;DR: The Louisville Ridge is a 4300km-long Late Cretaceous and Cenozoic hotspot chain, the South Pacific equivalent of the Hawaiian-Emperor chain this article.
Journal ArticleDOI
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.
Journal ArticleDOI
The Geisha Guyots: Multibeam bathymetry and morphometric interpretation
Peter R. Vogt,N. Christian Smoot +1 more
TL;DR: In this paper, multibeam bathymetric charts (100 fm = 183 m contour interval) are presented and analyzed for the ∼1100-km-long, 120° trending Geisha chain of eight guyots and at least 13 other seamounts (>1 km height) in the northwest Pacific; these guyots are compared with 23 others in the North Pacific.
Journal ArticleDOI
Evolution of the north flank of Tenerife by recurrent giant landslides
G. J. Ablay,Marcel Hürlimann +1 more
TL;DR: Geomorphologic analysis of submarine and subaerial surface features using a combined topographic/bathymetric digital elevation model coupled with onshore geological and geophysical data constrain the age and geometry of giant landslides affecting the north flank of Tenerife as discussed by the authors.
References
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Journal ArticleDOI
Some remarks on heat flow and gravity anomalies
TL;DR: In this paper, a simple model for the temperature within a spreading sea floor can reproduce the shape and magnitude of the observed anomalies, and it is not necessary for the upper mantle to be hotter beneath ridges than it is elsewhere.
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Island subsidence, hot spots, and lithospheric thinning
TL;DR: In this paper, the authors proposed that the Hawaiian swell is formed by lithospheric thinning over the Hawaiian hot spot, and the subsidence histories of several Pacific atolls are in quantitative agreement with this mechanism.
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Thermal origin of mid‐plate hot‐spot swells
TL;DR: In this paper, it was shown that shallow rises surrounding mid-plate, hot-spot volcanoes are caused by a broad-scale reheating of the lithosphere above hot-spots.
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Linear volcanism in French Polynesia
Robert A. Duncan,Ian McDougall +1 more
TL;DR: In this article, a geochronological study of the southeastward migration of volcanism in each of the four lineaments of the French Polynesian chain is presented. But the results of the study are limited to a single island chain.
Journal ArticleDOI
Lithospheric flexure and uplifted atolls
Marcia McNutt,Henry W. Menard +1 more
TL;DR: In this paper, the authors model the oceanic lithosphere as an elastic plate overlying a fluid asthenosphere and bracket the effective flexural rigidity of the oceans lithosphere between 1.7 and 2.5 × 1022 N m.