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  • 2020-2024  (80)
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  • 1
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    Links between Ikaite Morphology, Recrystallised Ikaite Petrography and Glendonite Pseudomorphs Determined from Polar and Deep-Sea Ikaite (2023)
    MDPI
    Details
    Publication Date: 2024-02-07
    Description: Petrography of recrystallised ikaite from Ocean Drilling Program material has been presented previously from Nankai Trough and Congo (ex-Zaire) deep-sea fan. This paper expands on the Nankai Trough ikaite observations, drawing on evidence from Laptev Sea, South Georgia, Okhotsk Sea, and coastal lagoon Point Barrow. However, even though many ikaite and glendonite sites occur at high latitudes, it cannot be that ikaite forms exclusively in polar environments, as demonstrated by the occurrences in the low latitude low temperature deep sea sediments offshore Gulf of Guinea (Angola Congo) and mid-latitude deep-sea trenches offshore Japan. Recrystallised ikaite occurs as mm large, zoned calcite crystals in all samples, along with secondary phases of calcite. Our data set is unique in that the origin, storage, and recrystallisation process of natural formed ikaite is recorded in detail and confirms that glendonite petrographic characteristics are a consequence of the structure and chemistry of recrystallising ikaite and not the physical or geochemical environment. The transformation of man-made ikaite to calcite as recorded in laboratory studies, is a process very similar to the one we have observed for natural ikaite. Most significant is that there is variation in the order of the calcite types within a single sample, leading to the conclusion that the variation is a consequence of impurities and geochemical variability in the ikaite, not the external environment. Morphological observations reveal similarities in ikaite and glendonite, this and the similarity in internal textures in glendonite and recrystallised ikaite confirms that glendonite may be used as an indicator of past presence of ikaite.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Earthquake-enhanced dissolved carbon cycles in ultra-deep ocean sediments (2023)
    Nature Research
    Details
    Publication Date: 2024-03-01
    Description: Hadal trenches are unique geological and ecological systems located along subduction zones. Earthquake-triggered turbidites act as efficient transport pathways of organic carbon (OC), yet remineralization and transformation of OC in these systems are not comprehensively understood. Here we measure concentrations and stable- and radiocarbon isotope signatures of dissolved organic and inorganic carbon (DOC, DIC) in the subsurface sediment interstitial water along the Japan Trench axis collected during the IODP Expedition 386. We find accumulation and aging of DOC and DIC in the subsurface sediments, which we interpret as enhanced production of labile dissolved carbon owing to earthquake-triggered turbidites, which supports intensive microbial methanogenesis in the trench sediments. The residual dissolved carbon accumulates in deep subsurface sediments and may continue to fuel the deep biosphere. Tectonic events can therefore enhance carbon accumulation and stimulate carbon transformation in plate convergent trench systems, which may accelerate carbon export into the subduction zones.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Stable oxygen and hydrogen isotopic composition of pore water (δ18O-H2O; δ2H-H2O) prepared from MeBo core GeoB22603-1 recovered from the Danube Deep-Sea Fan (2020)
    PANGAEA
    Details
    Publication Date: 2023-04-27
    Keywords: Black Sea; Center for Marine Environmental Sciences; Danube deep sea fan; DEPTH, sediment/rock; Device type; gas hydrate; GeoB22603-1; light hydrocarbons; M142; M142_03-1; MARUM; MeBo200; Meteor (1986); Methane; Method/Device of event; Optional event label; pore water; RV Meteor; Sample type; Submarine Gas Hydrate Resources; SUGAR; SUGAR project; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 68 data points
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    DATA PANGAEA
  • 4
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    Stable oxygen and hydrogen isotopic composition of pore water (δ18O-H2O; δ2H-H2O) prepared from MeBo core GeoB22620-1 recovered from the Danube Deep-Sea Fan (2020)
    PANGAEA
    Details
    Publication Date: 2023-04-27
    Keywords: Black Sea; Center for Marine Environmental Sciences; Danube deep sea fan; DEPTH, sediment/rock; Device type; gas hydrate; GeoB22620-1; light hydrocarbons; M142; M142_21-1; MARUM; MeBo200; Meteor (1986); Methane; Method/Device of event; Optional event label; pore water; RV Meteor; Sample type; Submarine Gas Hydrate Resources; SUGAR; SUGAR project; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Stable oxygen and hydrogen isotopic composition of pore water (δ18O-H2O; δ2H-H2O) prepared from MeBo core GeoB22605-1 recovered from the Danube Deep-Sea Fan (2020)
    PANGAEA
    Details
    Publication Date: 2023-04-27
    Keywords: Black Sea; Center for Marine Environmental Sciences; Danube deep sea fan; DEPTH, sediment/rock; Device type; gas hydrate; GeoB22605-1; light hydrocarbons; M142; M142_06-1; MARUM; MeBo200; Meteor (1986); Methane; Method/Device of event; Optional event label; pore water; RV Meteor; Sample type; Submarine Gas Hydrate Resources; SUGAR; SUGAR project; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 52 data points
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    DATA PANGAEA
  • 6
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    Stable isotopes in water in the Fram Strait from POLARSTERN cruises PS92 and PS93/1 in 2015 (2023)
    PANGAEA
    Details
    Publication Date: 2023-05-04
    Description: Measurements of stable water isotopes (δ Deuterium, δ18O, δ13C) from the water column in the Fram Strait from the POLARSTERN cruises PS92 (ARK-XXIX/1, TRANSSIZ) and PS93.1 (ARK-XXIX/2.1) in May to July 2015. δ Deuterium and δ18O were measured with a Picarro 2130i CRDS System, δ13C with a Finnigan MAT 252 gas isotope ratio mass spectrometer with Gasbench 2 at MARUM - Center for Marine Environmental Sciences. The measurements were conducted in 2020/2021.
    Keywords: Arctic Ocean; ARK-XXIX/1, TRANSSIZ; ARK-XXIX/2.1; Comment; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; Expendable CTD; Fram Strait; Giant box corer; GKG; ICE; Ice station; Isotope analyzer L2130-i, Picarro Inc.; Latitude of event; Longitude of event; Mass spectrometer Finnigan MAT 252; MUC; MultiCorer; Multicorer with television; North Greenland Sea; Polarstern; PS92; PS92/010-1; PS92/019-15; PS92/019-18; PS92/019-5; PS92/019-6; PS92/020-1; PS92/027-13; PS92/027-14; PS92/027-2; PS92/027-3; PS92/027-6; PS92/028-1; PS92/031-12; PS92/031-14; PS92/032-14; PS92/032-15; PS92/032-5; PS92/039-10; PS92/039-5; PS92/039-8; PS92/040-1; PS92/040-2; PS92/043-1; PS92/043-20; PS92/043-5; PS92/046-14; PS92/046-15; PS92/046-2; PS92/047-19; PS92/047-20; PS92/047-4; PS92/056-3; PS92/056-5; PS93/011-1; PS93/011-4; PS93/016-1; PS93/016-5; PS93/017-1; PS93/017-5; PS93/018-4; PS93/020-2; PS93/020-5; PS93/023-4; PS93/024-1; PS93/024-6; PS93/030-1; PS93/030-4; PS93/031-2; PS93/031-3; PS93/039-1; PS93/039-7; PS93/041-2; PS93/046-1; PS93/046-4; PS93.1; Sample comment; stable carbon isotope; stable oxygen isotope; stable water isotopes; TVMUC; Underwater video profiler; UVP; WP2; WP-2 towed closing plankton net; XCTD; δ13C; δ13C, uncertainty; δ18O, water; δ18O, water, uncertainty; δ Deuterium, water; δ Deuterium, water, uncertainty
    Type: Dataset
    Format: text/tab-separated-values, 2224 data points
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    DATA PANGAEA
  • 7
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    Methane concentrations of sediment core GeoB16421-1 from the Japan Trench (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-02
    Description: Shallow sediment cores were collected with gravity cores from sites in the Japan Trench during cruise SO219A with R/V SONNE. In order to determine ex-situ concentrations of methane dissolved in pore water, sediment samples were taken from the sediment cores with cut-off syringes and transferred into glass vials. Methane concentrations in the headspace gas were used to calculate concentrations of methane dissolved in pore water (uncorrected for sediment porosity and Bunsen coefficient).
    Keywords: 24; Center for Marine Environmental Sciences; DEPTH, sediment/rock; GC; GeoB16421-1; Gravity corer; MARUM; Methane, porewater; SO219A/2; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 7 data points
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    DATA PANGAEA
  • 8
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    Methane concentrations of sediment core GeoB16427-1 from the Japan Trench (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-02
    Description: Shallow sediment cores were collected with gravity cores from sites in the Japan Trench during cruise SO219A with R/V SONNE. In order to determine ex-situ concentrations of methane dissolved in pore water, sediment samples were taken from the sediment cores with cut-off syringes and transferred into glass vials. Methane concentrations in the headspace gas were used to calculate concentrations of methane dissolved in pore water (uncorrected for sediment porosity and Bunsen coefficient).
    Keywords: 30; Center for Marine Environmental Sciences; DEPTH, sediment/rock; GC; GeoB16427-1; Gravity corer; MARUM; Methane, porewater; SO219A/2; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 6 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Methane concentrations of sediment core GeoB16449-1 from the Japan Trench (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-02
    Description: Shallow sediment cores were collected with gravity cores from sites in the Japan Trench during cruise SO219A with R/V SONNE. In order to determine ex-situ concentrations of methane dissolved in pore water, sediment samples were taken from the sediment cores with cut-off syringes and transferred into glass vials. Methane concentrations in the headspace gas were used to calculate concentrations of methane dissolved in pore water (uncorrected for sediment porosity and Bunsen coefficient).
    Keywords: 47; Center for Marine Environmental Sciences; DEPTH, sediment/rock; GC; GeoB16449-1; Gravity corer; MARUM; Methane, porewater; SO219A/2; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 5 data points
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    DATA PANGAEA
  • 10
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    Monthly interpolated geochemical data and linear extension rates from IODP Expedition 310 Tahiti corals (2024)
    PANGAEA
    Details
    Publication Date: 2024-02-29
    Description: During the last deglacial transition, orbitally forced changes in the Northern Hemisphere temperature seasonality resulted in the change of global mean climate conditions. Despite its importance, the evolution of the annual cycle of environmental conditions at the Earth's surface is not well constrained. Fossil shallow-water corals provide a unique but relatively rare climate archive for the tropical ocean that can be sampled at high resolution. Here we present monthly resolved geochemical proxy data (Sr/Ca, Mg/Ca, δ¹⁸O, δ¹³C) extracted along the growth axes of Porites skeletons recovered during IODP Expedition 310 “Tahiti Sea Level”. These coral colonies have been U-Th dated and cover an age between 9.06 and 15.15 ka BP. Furthermore, this data set contains annual linear extension rates for the deglacial Porites corals.
    Keywords: Center for Marine Environmental Sciences; Coral; d13C; d18O; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; MARUM; Sr/Ca
    Type: Dataset
    Format: application/zip, 42 datasets
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