RV SONNE Fahrtbericht / Cruise Report SO249 BERING – Origin and Evolution of the Bering Sea: An Integrated Geochronological, Volcanological, Petrological and Geochemical Approach, Leg 1: Dutch Harbor (U.S.A.) - Petropavlovsk-Kamchatsky (Russia), 05.06.2016 - 15.07.2016, Leg 2: Petropavlovsk-Kamchatsky (Russia) - Tomakomai (Japan), 16.07.2016 - 14.08.2016.

Werner, Reinhard, Hoernle, Kaj, Hauff, Folkmar, Portnyagin, Maxim, Yogodzinski, Gene and Ziegler, Alexander, eds. (2016) RV SONNE Fahrtbericht / Cruise Report SO249 BERING – Origin and Evolution of the Bering Sea: An Integrated Geochronological, Volcanological, Petrological and Geochemical Approach, Leg 1: Dutch Harbor (U.S.A.) - Petropavlovsk-Kamchatsky (Russia), 05.06.2016 - 15.07.2016, Leg 2: Petropavlovsk-Kamchatsky (Russia) - Tomakomai (Japan), 16.07.2016 - 14.08.2016. Open Access . GEOMAR Report, N. Ser. 030 . GEOMAR Helmholtz-Zentrum für Ozeanforschung , Kiel, Germany, 451 pp. DOI 10.3289/GEOMAR_REP_NS_30_2016.

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Abstract

The R/V SONNE expedition SO-249 is part of the research project BERING, conducted in the
framework of the Russian-German Agreement on Marine and Polar Research and in close
cooperation with U.S. American colleagues. The overarching goal of BERING is to elucidate the
magmatic and tectonic evolution of the Bering Sea and its margins over the past ≥50 m.y. In
particular, BERING investigates the physical and chemical conditions that control the
development of subduction zones, including subduction initiation, evolution of mature arc
systems, and the impact of subduction volcanism on the environment. R/V SONNE cruise SO-
249 BERING conducted geological, morphological, and biological studies in the in western the
Aleutians, the Pacific seafloor subducting beneath the Aleutians and northern Kamchatka, and in
the western Bering Sea. Besides extensive multi-beam mapping and sediment echo-sounder
profiling, total of 150 dredge hauls have been conducted on the two legs of cruise SO-249. Of
these, 91 delivered massive magmatic and/or metamorphic rocks, 34 volcaniclastic rocks
including breccias containing lava fragments, 64 sedimentary rocks, and 19 Mn-Fe-Oxide crusts
and nodules. No equipment was lost or seriously damaged. SO-249 achieved its major goals
and the SO-249 sample set represents the most detailed sampling of the working areas to date.
The on shore work program at Russian, German, and U.S.-American institutions includes
geochronological, petrological and geochemical studies on igneous samples obtained during the
cruise. The results of BERING will be integrated with those of previous campaigns (e.g. KOMEX,
KALMAR), and work carried out within the World Oceans and GeoPRISMS initiatives.
The main goal of biological sampling was to survey the benthic biodiversity in the study area.
In addition, fresh specimens pertaining to specific taxa (Cnidaria, Brachiopoda, Cephalopoda,
Echinodermata) were collected to supplement ongoing research projects. Of the 150 dredges
taken, 150 (100%) contained sediment and 112 (74.7%) contained macrofauna. In addition to
the 150 sediment samples, almost 1,500 single benthic, benthopelagic, and pelagic macrofaunal
organisms were obtained. The majority of the objectives of biological sampling were reached, in
particular with regard to obtaining fresh tissue for immunohistochemical, genomic, and
transcriptomic analysis from various brachiopod and ophiuroid species.

Document Type: Report (Cruise Report)
Keywords: Bering Sea, Aleutian Arc, Northwest-Pacific, Emperor Seamounts, Subduction, Island Arc, Fracture Zones, Bathymetry, Geochronology, Magmatic Geochemistry, Petrology, Volcanology, Geodynamics, RV Sonne, SO249, Cruise Report, BERING
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
DOI etc.: 10.3289/GEOMAR_REP_NS_30_2016
ISSN: 2193-8113
Projects: BERING
Expeditions/Models/Experiments:
Date Deposited: 26 Oct 2016 12:32
Last Modified: 18 Nov 2016 13:54
URI: http://oceanrep.geomar.de/id/eprint/34425

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