Lifetime and cyclicity of fluid venting at forearc mound structures determined by tephrostratigraphy and radiometric dating of authigenic carbonates.

Kutterolf, Steffen, Liebetrau, Volker, Mörz, T., Freundt, Armin, Hammerich, T. and Garbe-Schönberg, C.-Dieter (2008) Lifetime and cyclicity of fluid venting at forearc mound structures determined by tephrostratigraphy and radiometric dating of authigenic carbonates. Geology, 36 (9). pp. 707-710. DOI 10.1130/G24806A.1.

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Abstract

At convergent margins, fluids rise through the forearc in response to consolidation of the upper plate and dewatering of the subducting plate, and produce various cold-seep–related features on the seafloor (mud diapirs, mud mounds). At the Central American forearc, authigenic carbonates precipitated from rising fluids within such structures during active venting while typical mixed-mud sediments were ejected onto the surrounding seafloor where they became intercalated with normal pelagic background sediments, indicating that mud mounds evolved unsteadily through alternating active and inactive phases. Intercalated regional ash layers from Plinian eruptions at the Central American volcanic arc provide time marks that constrain the ages of mud ejection activity. U/Th dating of drill core samples of authigenic carbonate caps of mud mounds yields ages agreeing well with those constrained by ash layers and showing that carbonate caps grow inward rather than outward during active venting.

Both dating approaches show that offshore Nicaragua and Costa Rica (1) active and inactive phases can occur simultaneously at neighboring mounds, (2) mounds along the forearc have individual histories of activity, but there are distinct time intervals when nearly all mounds have been active or inactive, (3) lifetimes of mounds reach several hundred thousand years, and (4) highly active periods last 10–50 k.y. with intervening periods of >10 k.y. of relative quiescence.

Document Type: Article
Keywords: forearc, tephrostratigraphy, radiometric dating, hydrological system, cyclicity
Research affiliation: OceanRep > SFB 574 > C4
OceanRep > SFB 574 > B6
Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > SFB 574
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1130/G24806A.1
ISSN: 0091-7613
Projects: Future Ocean, SFB574, COMET
Contribution Number:
ProjectNumber
SFB 574137
Expeditions/Models/Experiments:
Date Deposited: 03 Dec 2008 16:51
Last Modified: 24 May 2017 10:03
URI: http://oceanrep.geomar.de/id/eprint/2479

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