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Biostratigraphic Evidence of Dramatic Holocene Uplift of Robinson Crusoe Island, Juan Fernández Ridge, SE Pacific Ocean : Volume 11, Issue 9 (19/09/2014)

By Sepúlveda, P.

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Book Id: WPLBN0004004697
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: Biostratigraphic Evidence of Dramatic Holocene Uplift of Robinson Crusoe Island, Juan Fernández Ridge, SE Pacific Ocean : Volume 11, Issue 9 (19/09/2014)  
Author: Sepúlveda, P.
Volume: Vol. 11, Issue 9
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Lara, L. E., Orozco, G., Le Roux, J. P., Astudillo, V., & Sepúlveda, P. (2014). Biostratigraphic Evidence of Dramatic Holocene Uplift of Robinson Crusoe Island, Juan Fernández Ridge, SE Pacific Ocean : Volume 11, Issue 9 (19/09/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Departamento de Geología, FCFM, Universidad de Chile. A study of the biostratigraphy and sedimentology of Holocene deposits on Robinson Crusoe Island (RCI) on the Juan Fernández Ridge (JFR) indicates that a~dramatic but localized uplift occurred since 8000 BP, at a rate of about 8.5 mm yr−1. In fact, supratidal flats and sand layers with marine gastropods (mostly Nerita sp.) are now exposed ca. 70 m a.s.l., and covered by transitional dunes. The last volcanic activity on RCI occurred at ca. 0.8 Ma (active hotspot located 280 km further west) and there is no sign of a compensating bulge that explains this uplift, isobaths of the sea floor instead suggesting general subsidence. However, modeling indicates that large-scale landslides followed by isostatic rebound are a viable explanation, partially reflected in the low-resolution bathymetry of the area.

Summary
Biostratigraphic evidence of dramatic Holocene uplift of Robinson Crusoe Island, Juan Fernández Ridge, SE Pacific Ocean

Excerpt
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