Publication Date:
2019-09-23
Description:
The overarching goal of SFB 574 is to understand the role and fate of volatiles and fluids in subduction zones. Both components have a major influence on, e.g., short- and long-term climate change, the geochemical evolution of the
hydrosphere and atmosphere, as well as subduction-related natural hazards, such as earthquakes, volcanic eruptions and tsunamis, because they are cycled through the entire subduction system. The Chilean margin, which switched from erosion to accretion within the last several million years, has been chosen for the remainder of the SFB. Major goals of cruise SO-210 are:
1) to investigate and quantify the dewatering processes in the forearc of the central Chilean subduction zone, in particular the origin and output flux of vent
fluids and volatiles, 2) to study biological processes fuelled by this discharge, 3) to use cold seep carbonates as a geochemical archive of cold seep activity, 4) to evaluate the role of forearc fluids in triggering mass wasting events that could generate tsunamis, 5) to characterize geochemically the subducting sediments to determine the input flux of climate-relevant volatiles and a
variety of trace elements, and 6) to investigate the distribution of volcanic ashes to improve estimates on the volume of material emitted by volcanic eruptions and to date distinct events within the sedimentary sequence.
Preliminary investigations by Chilean colleagues revealed definite indications of fluid venting which together with recent geophysical investigations are the basis for the present cruise. Here, we will present preliminary results and new discoveries made during the cruise.
Type:
Conference or Workshop Item
,
NonPeerReviewed
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