Massive barite deposits and carbonate mineralization in the Derugin Basin, Sea of Okhotsk: Precipitation process at cold vent sites.

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dc.contributor.author Greinert, Jens
dc.contributor.author Bollwerk, S
dc.contributor.author Derkachev, A N
dc.contributor.author Bohrmann, Gerhard
dc.contributor.author Suess, Erwin
dc.coverage.spatial MEDIAN LATITUDE: 54.003079 * MEDIAN LONGITUDE: 146.287444 * SOUTH-BOUND LATITUDE: 53.996600 * WEST-BOUND LONGITUDE: 146.261433 * NORTH-BOUND LATITUDE: 54.020267 * EAST-BOUND LONGITUDE: 146.297167 * DATE/TIME START: 1998-08-17T00:21:00 * DATE/TIME END: 1998-08-20T07:15:00
dc.date.accessioned 2019-11-24T12:20:06Z
dc.date.available 2019-11-24T12:20:06Z
dc.date.issued 2002-09-07
dc.identifier https://doi.pangaea.de/10.1594/PANGAEA.769675
dc.identifier https://doi.org/10.1594/PANGAEA.769675
dc.identifier.citation Greinert, Jens; Bollwerk, S; Derkachev, A N; Bohrmann, Gerhard; Suess, Erwin (2002): Massive barite deposits and carbonate mineralization in the Derugin Basin, Sea of Okhotsk: Precipitation process at cold vent sites. Earth and Planetary Science Letters, 203, 165-180, https://doi.org/10.1016/S0012-821X(02)00830-0
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/7873
dc.description.abstract An area of massive barite precipitations was studied at a tectonic horst in 1500 m water depth in the Derugin Basin, Sea of Okhotsk. Seafloor observations and dredge samples showed irregular, block- to column-shaped barite build-ups up to 10 m high which were scattered over the seafloor along an observation track 3.5 km long. High methane concentrations in the water column show that methane expulsion and probably carbonate precipitation is a recently active process. Small fields of chemoautotrophic clams (Calyptogena sp., Acharax sp.) at the seafloor provide additional evidence for active fluid venting. The white to yellow barites show a very porous and often layered internal fabric, and are typically covered by dark-brown Mn-rich sediment; electron microprobe spectroscopy measurements of barite sub-samples show a Ba substitution of up to 10.5 mol% of Sr. Rare idiomorphic pyrite crystals (~1%) in the barite fabric imply the presence of H2S. This was confirmed by clusters of living chemoautotrophic tube worms (1 mm in diameter) found in pores and channels within the barite. Microscopic examination showed that micritic aragonite and Mg-calcite aggregates or crusts are common authigenic precipitations within the barite fabric. Equivalent micritic carbonates and barite carbonate cemented worm tubes were recovered from sediment cores taken in the vicinity of the barite build-up area. Negative d13C values of these carbonates (>-43.5 per mill PDB) indicate methane as major carbon source; d18O values between 4.04 and 5.88 per mill PDB correspond to formation temperatures, which are certainly below 5°C. One core also contained shells of Calyptogena sp. at different core depths with 14C-ages ranging from 20 680 to >49 080 yr. Pore water analyses revealed that fluids also contain high amounts of Ba; they also show decreasing SO4**2- concentrations and a parallel increase of H2S with depth. Additionally, S and O isotope data of barite sulfate (d34S: 21.0-38.6 per mill CDT; d18O: 9.0-17.6 per mill SMOW) strongly point to biological sulfate reduction processes. The isotope ranges of both S and O can be exclusively explained as the result of a mixture of residual sulfate after a biological sulfate reduction and isotopic fractionation with 'normal' seawater sulfate. While massive barite deposits are commonly assumed to be of hydrothermal origin, the assemblage of cheomautotrophic clams, methane-derived carbonates, and non-thermally equilibrated barite sulfate strongly implies that these barites have formed at ambient bottom water temperatures and form the features of a Giant Cold Seep setting that has been active for at least 49 000 yr.
dc.format application/zip, 3 datasets
dc.language.iso en
dc.publisher PANGAEA
dc.rights CC-BY-3.0: Creative Commons Attribution 3.0 Unported
dc.rights Access constraints: unrestricted
dc.source Supplement to: Greinert, Jens; Bollwerk, S; Derkachev, A N; Bohrmann, Gerhard; Suess, Erwin (2002): Massive barite deposits and carbonate mineralization in the Derugin Basin, Sea of Okhotsk: Precipitation process at cold vent sites. Earth and Planetary Science Letters, 203, 165-180, https://doi.org/10.1016/S0012-821X(02)00830-0
dc.subject Akademik M.A. Lavrentyev
dc.subject Dredge
dc.subject DRG
dc.subject GC
dc.subject Gravity corer
dc.subject HYC
dc.subject Hydro corer
dc.subject KOMEX I
dc.subject LV28
dc.subject LV28-25-1
dc.subject LV28-35-1
dc.subject LV28-36-1
dc.subject LV28-37-1
dc.subject Sea of Okhotsk
dc.title Massive barite deposits and carbonate mineralization in the Derugin Basin, Sea of Okhotsk: Precipitation process at cold vent sites.
dc.title.alternative AMS 14C ages and isotopic compositions of samples from the Derugin Basin, Sea of Okhotsk
dc.type Dataset


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