Constraining input and output fluxes of the southern Central Chile Subduction Zone: water, chlorine, sulfur

Völker, David, Wehrmann, Heidi, Kutterolf, Steffen, Iyer, Karthik, Rabbel, Wolfgang, Geersen, Jacob and Hoernle, Kaj (2014) Constraining input and output fluxes of the southern Central Chile Subduction Zone: water, chlorine, sulfur International Journal of Earth Sciences, 103 (7). pp. 2129-2153. DOI 10.1007/s00531-014-1002-0.

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In this paper, we constrain the input and output fluxes of H2O, Cl and S into the southern-central Chilean subduction zone (31°S–46°S). We determine the input flux by calculating the amounts of water, chlorine and sulfur that are carried into the subduction zone in subducted sediments, igneous crust and hydrated lithospheric mantle. The applied models take into account that latitudinal variations in the subducting Nazca plate impact the crustal porosity and the degree of upper mantle serpentinization and thus water storage in the crust and mantle. In another step, we constrain the output fluxes of the subduction zone both to the subcontinental lithospheric mantle and to the atmosphere–geosphere–ocean by the combined use of gas flux determinations at the volcanic arc, volume calculations of volcanic rocks and the combination of mineralogical and geothermal models of the subduction zone. The calculations indicate that about 68 Tg/m/Ma of water enters the subduction zone, as averaged over its total length of 1,480 km. The volcanic output on the other hand accounts for 2 Tg/m/Ma or 3 % of that input. We presume that a large fraction of the volatiles that are captured within the subducting sediments (which accounts for roughly one-third of the input) are cycled back into the ocean through the forearc. This assumption is however questioned by the present lack of evidence for major venting systems of the submarine forearc. The largest part of the water that is carried into the subduction zone in the crust and hydrated mantle (accounting for two-thirds of the input) appears to be transported beyond the volcanic arc.

Document Type: Article
Additional Information: WOS:000343216700025
Keywords: Subduction input ; Forearc dewatering ; Arc magmatism ; Volcanic volatile output rates ; Subduction fluids ; Southern volcanic zone of Chile
Research affiliation: OceanRep > SFB 574 > C4
OceanRep > SFB 574 > C5
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
OceanRep > SFB 574 > A1
Kiel University
OceanRep > SFB 574 > A5
OceanRep > SFB 574 > C2
OceanRep > SFB 574
OceanRep > SFB 574 > A2
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
DOI etc.: 10.1007/s00531-014-1002-0
ISSN: 1437-3254
Date Deposited: 17 Feb 2014 14:39
Last Modified: 23 May 2017 07:24

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