RV SONNE Fahrtbericht / Cruise Report SO255: VITIAZ – The Life Cycle of the Vitiaz-Kermadec Arc / Backarc System: from Arc Initiation to Splitting and Backarc Basin Formation, Auckland (New Zealand) - Auckland (New Zealand) 02.03.-14.04.2017.

Hoernle, Kaj, Hauff, Folkmar and Werner, Reinhard, eds. (2017) RV SONNE Fahrtbericht / Cruise Report SO255: VITIAZ – The Life Cycle of the Vitiaz-Kermadec Arc / Backarc System: from Arc Initiation to Splitting and Backarc Basin Formation, Auckland (New Zealand) - Auckland (New Zealand) 02.03.-14.04.2017. Open Access . GEOMAR Report, N. Ser. 035 . GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, 386 pp. DOI 10.3289/GEOMAR_REP_NS_35_2017.

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Abstract

The R/V SONNE expedition SO255 is part of the research project VITIAZ, conducted in close
cooperation with New Zealandic, U.S. American, and Japanese scientists. The overarching goal
of VITIAZ is to elucidate the physical and chemical conditions that control the development of
subduction zones, including subduction initiation, evolution of mature arc systems, and the
transition from arc splitting to backarc basin generation. This approach should also provide basic
data for a better evaluation of the impact of subduction volcanism on the environment. Cruise
SO255 mapped and sampled magmatic structures at the Kermadec Fore Arc, the Kermadec
Ridge, the Havre Trough, and the Colville Ridge (SW-Pacific) using Kongsberg EM122 and
EM710 multi-beam echo sounding systems, an Atlas PARASOUND DS P-70 sub-bottom profiler,
and chain bag dredges. Besides extensive profiling, a total of 165 dredge hauls in an average
water depth of 2,500 m were carried out on SO255. Of these, 137 (= 83%) delivered in situ
samples of which 102 obtained lava or subvolcanic rocks, 69 volcaniclastics, and 30 sedimentary
rocks. No equipment was lost or seriously damaged. The on shore work program at GEOMAR
and cooperating institutions will include volcanological, geochronological, petrological and
geochemical studies on igneous samples obtained during the cruise. The results of VITIAZ will
be integrated with those of previous campaigns (e.g. SO249 BERING), and work carried out
within the GeoPRISMS initiative.
The geological program of the cruise has been completed by biological investigations
intending (1) to collect planktonic gastropod specimens for morphological and molecular analysis
to understand their taxonomy, biogeography and evolution; (2) to use water samples to study
degradation processes in the deep sea; and (3) to describe the benthic diversity of deep-sea
invertebrates in the working area by collecting macro benthos from the dredged rocks.

Document Type: Report (Cruise Report)
Keywords: RV Sonne, SO255, Cruise report, VITIAZ, Vitiaz-Kermadec Arc, backarc basin
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
DOI etc.: 10.3289/GEOMAR_REP_NS_35_2017
ISSN: 2193-8113
Projects: VITIAZ
Expeditions/Models/Experiments:
Date Deposited: 14 Jun 2017 11:40
Last Modified: 14 Jun 2017 13:33
URI: http://oceanrep.geomar.de/id/eprint/38365

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