Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data
10 pages, 7 figures
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Format: | artículo biblioteca |
Language: | English |
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Elsevier
2009-10
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Subjects: | Fluid seepage, Deep-towed side-scan sonar, Sub-bottom profiler, Carbonate, Mound, Mud diapir, |
Online Access: | http://hdl.handle.net/10261/83909 |
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dig-icm-es-10261-839092020-12-09T16:01:43Z Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data Petersen, Carl Jörg Klaucke, Ingo Weinrebe, Wilhelm Ranero, César R. Fluid seepage Deep-towed side-scan sonar Sub-bottom profiler Carbonate Mound Mud diapir 10 pages, 7 figures Our analysis of geoacoustic data from the Middle American margin provides an insight into the formation and evolution mechanisms of mound structures observed on the continental slope offshore Costa Rica. Based on high-resolution deep-towed sidescan sonar and sub-bottom profiler (SBP) data six different mound and fluid seepage structures at the Hongo mound field are characterized in detail. The Hongo mound field is located on the lower continental slope offshore Nicoya peninsula in the prolongation of the subducting Nicoya fracture zone. The mounds have oval to circular shapes with diameters of 500-1600 m and relief heights of 60-100 m. High backscatter anomalies near the mound summits indicate carbonate precipitation and focused fluid seepage activity within the last 10 ka. The data do not show evidence for mud extrusions and the structures were probably formed by a combination of carbonate precipitation and mud diapirism. Based on seismic stratigraphy analysis, mud diapirism is at least active since 42.5-57 ka and average vertical growth rates vary between 6-24 cm/ka. However, if diapirism represents the dominant mound evolution mechanism, mound heights of 80 m point to much older mound ages of 330-1330 ka. © 2009 Elsevier B.V. All rights reserved Funding for the cruise and subsequent work has been provided by the German Ministry of Education and Research (BMBF) and the German Research Foundation (DFG). This publication is contribution 179 of the Sonderforschungsbereich 574 “Volatiles and fluids in subduction zones” at Kiel University Peer Reviewed 2013-10-11T09:01:32Z 2013-10-11T09:01:32Z 2009-10 2013-10-11T09:01:32Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.margeo.2009.08.004 issn: 0025-3227 Marine Geology 266(1-4): 172-181 (2009) http://hdl.handle.net/10261/83909 10.1016/j.margeo.2009.08.004 en https://doi.org/10.1016/j.margeo.2009.08.004 none Elsevier |
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Fluid seepage Deep-towed side-scan sonar Sub-bottom profiler Carbonate Mound Mud diapir Fluid seepage Deep-towed side-scan sonar Sub-bottom profiler Carbonate Mound Mud diapir |
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Fluid seepage Deep-towed side-scan sonar Sub-bottom profiler Carbonate Mound Mud diapir Fluid seepage Deep-towed side-scan sonar Sub-bottom profiler Carbonate Mound Mud diapir Petersen, Carl Jörg Klaucke, Ingo Weinrebe, Wilhelm Ranero, César R. Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data |
description |
10 pages, 7 figures |
format |
artículo |
topic_facet |
Fluid seepage Deep-towed side-scan sonar Sub-bottom profiler Carbonate Mound Mud diapir |
author |
Petersen, Carl Jörg Klaucke, Ingo Weinrebe, Wilhelm Ranero, César R. |
author_facet |
Petersen, Carl Jörg Klaucke, Ingo Weinrebe, Wilhelm Ranero, César R. |
author_sort |
Petersen, Carl Jörg |
title |
Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data |
title_short |
Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data |
title_full |
Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data |
title_fullStr |
Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data |
title_full_unstemmed |
Fluid seepage and mound formation offshore Costa Rica revealed by deep-towed sidescan sonar and sub-bottom profiler data |
title_sort |
fluid seepage and mound formation offshore costa rica revealed by deep-towed sidescan sonar and sub-bottom profiler data |
publisher |
Elsevier |
publishDate |
2009-10 |
url |
http://hdl.handle.net/10261/83909 |
work_keys_str_mv |
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