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  • 2020-2024  (15)
  • 2022  (15)
Document type
Keywords
Publisher
Years
Year
  • 1
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    Continuous thermosalinograph oceanography along RV METEOR cruise M170 (2022)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Description: Underway temperature and salinity data was collected along the cruise track with two autonomous thermosalinograph (TSG) systems, each consisting of a SBE21 TSG together with a SBE38 Thermometer. Both systems worked independent from each other throughout the cruise. While temperature is taken at the water inlet in about 2.5 m depth, salinity is estimated within the interior TSG from conductivity and interior temperature. No correction against independent data was performed, neither for temperature nor for salinity. Finally, TSG1 was chosen for publication. For details to all processing steps see Data Processing Report.
    Keywords: Calculated from internal temperature and conductivity; Conductivity; DAM_Underway; DAM Underway Research Data; DATE/TIME; DEPTH, water; Digital oceanographic thermometer, Sea-Bird, SBE 38; GPF 20‐3_090, TRANSFORMERS; LATITUDE; LONGITUDE; M170; M170_0_Underway-3; Measurement container; Meteor (1986); Quality flag, salinity; Quality flag, water temperature; Salinity; Seadatanet flag: Data quality control procedures according to SeaDataNet (2010); Temperature, water; Temperature, water, internal; Thermosalinograph; Thermosalinograph (TSG), Sea-Bird, SBE 21 SEACAT; TSG
    Type: Dataset
    Format: text/tab-separated-values, 185983 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Multibeam bathymetry raw data (Kongsberg EM 122 transit dataset) of RV METEOR during cruise M170 (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Multibeam bathymetry raw data was recorded in the North Atlantic during cruise M170 that took place between 2021-01-11 and 2021-02-10. The data was collected using the ship's own Kongsberg EM 122. This data is part of the DAM (German Marine Research Alliance) underway research data project. For the transit towards the working area around the Oceanographer and Hayes Transform Faults no dedicated sound velocity profile has been used. Instead a profile from a previous cruise to the Atlantic Ocean has been used. In the working area a XBT sound velocity profile has been taken at the start of the survey, which was used for the transit back.
    Keywords: Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; Event label; File content; GPF 20‐3_090, TRANSFORMERS; KEM122; Kongsberg datagram raw file name; KONGSBERG EM122; LATITUDE; LONGITUDE; M170; M170_0_Underway-4; M170_5-1; Meteor (1986); Number of pings; Ship speed; South Atlantic Ocean; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; XBT
    Type: Dataset
    Format: text/tab-separated-values, 5354 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Seismic refraction and wide-angle data across Emperor Seamounts (Northwest Pacific) from profile P01 of RV Marcus G. Langseth cruise MGL1902 (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: In May of 2019 the US American research vessel Marcus G. Langseth shot seismic profile p01 across the Emperor Seamounts in the northwest Pacific Ocean. Shots were recorded on 27 ocean-bottom-seismometers (OBS) of the US American Pool and GEOMAR Helmholtz Centre for Ocean Research Kiel. Seismic data in SEGY format of the GEOMAR OBS are here available from PANGAEA Datacenter. Please note that the data have a time offset of 1 sec and a reduction velocity of 8 km/s. The SEGY data from the US American OBS are available at the Incorporated Research Institution for Seismology (IRIS) under the network code ZU. The seismic survey was funded by the US American National Science Foundation (Awards OCE17-37243, OCE17-37245).
    Keywords: Binary Object; Binary Object (File Size); Comment; Elevation of event; Event label; File content; Latitude of event; Longitude of event; Marcus G. Langseth; MGL1902; MGL1902_obs103; MGL1902_obs104; MGL1902_obs105; MGL1902_obs106; MGL1902_obs107; MGL1902_obs108; MGL1902_obs109; MGL1902_obs110; MGL1902_obs111; MGL1902_obs112; MGL1902_obs113; MGL1902_obs121; MGL1902_obs122; MGL1902_obs124; MGL1902_obs125; MGL1902_obs126; MGL1902_obs127; MGL1902_obs128; MGL1902_obs129; MGL1902_obs130; MGL1902_obsE114; MGL1902_obsE115; MGL1902_obsE116; MGL1902_obsE117; MGL1902_obsE118; MGL1902_obsE119; MGL1902_obsE120; MGL1902_P01; North Pacific Ocean; OBS; ocean bottom seismometer; Ocean bottom seismometer; oceanic crust; Pacific Ocean; S01; Seamounts; seismic data; Seismic refraction profile; SEISREFR
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Seismic refraction and wide-angle data surveying the continent-to-ocean transition zone in the Iberia Abyssal Plain (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: In September of 2018, the Spanish research vessel Sarmiento de Gamboa shot the seismic profile FRAME-p03 across the continent-to-ocean transition zone in the Iberia Abyssal Plain of the Western Iberia passive continental margion to the west of Portugal. Seismic shots were recorded on 30 ocean-bottom-seismometers (OBS) and ocean-bottom-hydrophones (OBH). Spanish instruments were OBS from the Spanish Pool operated by the Marine Technology Unit (UTM) of Consejo Superior de Investigaciones Científicas (CSIC) and German istruments were OBH from the GEOMAR Helmholtz Centre for Ocean Research Kiel. Seismic data in SEGY format of the all seismic stations of both partners are archived at the PANGAEA Datacenter. Please note that the data have a time offset of 1 sec and a reduction velocity of 8 km/s. The seismic FRAME (Formation of Geological Domains in the Western Iberian Margin and Tectonic Reactivation of their Limit) cruise was funded by the Spanish Ministry of Science.
    Keywords: Atlantic; Binary Object; Binary Object (File Size); Elevation of event; Event label; File content; FRAME-OBS; FRAME-OBS_OBH100; FRAME-OBS_OBH101; FRAME-OBS_OBH102; FRAME-OBS_OBH103; FRAME-OBS_OBH76; FRAME-OBS_OBH77; FRAME-OBS_OBH78; FRAME-OBS_OBH79; FRAME-OBS_OBH80; FRAME-OBS_OBH81; FRAME-OBS_OBH88; FRAME-OBS_OBH89; FRAME-OBS_OBH90; FRAME-OBS_OBH91; FRAME-OBS_OBH92; FRAME-OBS_OBH93; FRAME-OBS_OBS104; FRAME-OBS_OBS105; FRAME-OBS_OBS82; FRAME-OBS_OBS83; FRAME-OBS_OBS84; FRAME-OBS_OBS85; FRAME-OBS_OBS86; FRAME-OBS_OBS87; FRAME-OBS_OBS94; FRAME-OBS_OBS95; FRAME-OBS_OBS96; FRAME-OBS_OBS97; FRAME-OBS_OBS98; FRAME-OBS_OBS99; FRAME-OBS_P03; Latitude of event; Longitude of event; OBH; OBS; Ocean bottom hydrophone; ocean-bottom-hydrophones; ocean bottom seismometer; Ocean bottom seismometer; oceanic crust; passive continental margin; Portuguese Margin; S03; Sarmiento de Gamboa; seismic data; Seismic refraction profile; SEISREFR; South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Multibeam bathymetry raw data (Kongsberg EM 122 working area dataset) of RV METEOR during cruise M170 (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Multibeam bathymetry raw data was recorded in the North Atlantic during cruise M170 that took place between 2021-01-11 and 2021-02-10. The data was collected using the ship's own Kongsberg EM 122. This data is part of the DAM (German Marine Research Alliance) underway research data project. In the working area a XBT sound velocity profile has been taken at the start of the survey.
    Keywords: Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; Event label; File content; GPF 20‐3_090, TRANSFORMERS; KEM122; Kongsberg datagram raw file name; KONGSBERG EM122; LATITUDE; LONGITUDE; M170; M170_0_Underway-4; M170_5-1; Meteor (1986); Number of pings; Ship speed; South Atlantic Ocean; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; XBT
    Type: Dataset
    Format: text/tab-separated-values, 8730 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    The Oceanographer transform fault revisited - preliminary results from a micro-seismicity survey reveals extensional tectonics at ridge-transform intersections (2022)
    Details
    Publication Date: 2024-01-02
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 7
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    Lower oceanic crust formed by in situ melt crystallization revealed by seismic layering (2022)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: Oceanic crust forms at mid-ocean spreading centres through a combination of magmatic and tectonic processes, with the magmatic processes creating two distinct layers: the upper and the lower crust. While the upper crust is known to form from lava flows and basaltic dykes based on geophysical and drilling results, the formation of the gabbroic lower crust is still debated. Here we perform a full waveform inversion of wide-angle seismic data from relatively young (7–12-Myr-old) crust formed at the slow-spreading Mid-Atlantic Ridge. The seismic velocity model reveals alternating, 400–500 m thick, high- and low-velocity layers with ±200 m s−1 velocity variations, below ~2 km from the oceanic basement. The uppermost low-velocity layer is consistent with hydrothermal alteration, defining the base of extensive hydrothermal circulation near the ridge axis. The underlying layering supports that the lower crust is formed through the intrusion of melt as sills at different depths, which cool and crystallize in situ. The layering extends up to 5–15 km distance along the seismic profile, covering 300,000–800,000 years, suggesting that this form of lower crustal accretion is a stable process.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Impact of Spreading Rate and Age‐Offset on Oceanic Transform Fault Morphology (2022)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-02-07
    Description: Oceanic transform faults (OTFs) are an inherent part of seafloor spreading and plate tectonics, whereas the process controlling their morphology remains enigmatic. Here, we systematically quantify variations in transform morphology and their dependence on spreading rate and age-offset, based on a compilation of shipborne bathymetric data from 94 OTFs at ultraslow- to intermediate-spreading ridges. In general, the length, width and depth of OTFs scale systematically better with age-offset rather than spreading rate. This observation supports recent geodynamic models proposing that cross-transform extension scaling with age-offset, is a key process of transform dynamics. On the global scale, OTFs with larger age-offsets tend to have longer, wider, and deeper valleys. However, at small age-offsets (〈5 Myr), scatters in the depth and width of OTFs increase, indicating that small age-offset OTFs with weak lithospheric strength are easily affected by secondary tectonic processes.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    The continent-to-ocean transition in the Iberia Abyssal Plain (2022)
    GSA (Geological Society of America)
    Details
    Publication Date: 2024-02-07
    Description: Conceptual models of magma-poor rifting are strongly based on studies of the nature of the basement in the continent-to-ocean transition of the Iberia Abyssal Plain, and suggest that exhumed mantle abuts extended continental crust. Yet, basement has only been sampled at a few sites, and its regional nature and the transition to seafloor spreading inferred from relatively low-resolution geophysical data are inadequately constrained. This uncertainty has led to a debate about the subcontinental or seafloor-spreading origin of exhumed mantle and the rift-related or oceanic nature of magmatic crust causing the magnetic J anomaly. Different interpretations change the locus of break-up by 〉100 km and lead to debate of the causative processes. We present the tomographic velocity structure along a 360-km-long seismic profile centered at the J anomaly in the Iberia Abyssal Plain. Rather than delineating an excessive outpouring of magma, the J anomaly occurs over subdued basement. Furthermore, its thin crust shows the characteristic layering of oceanic crust and is juxtaposed to exhumed mantle, marking the onset of magma-starved seafloor spreading, which yields the westward limit of an ~160-km-wide continent–ocean transition zone where continental mantle has been unroofed. This zone is profoundly asymmetric with respect to its conjugate margin, suggesting that the majority of mantle exhumation occurs off Iberia. Because the J anomaly is related to the final break-up and emplacement of oceanic crust, it neither represents synrift magmatism nor defines an isochron, and hence it poorly constrains plate tectonic reconstructions.
    Type: Article , PeerReviewed
    Format: text
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    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Crustal Compositional Variations From Continental to Oceanic Domain: A Vp/Vs Ratio Study Across the Zhongsha Block, South China Sea (2022)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-02-07
    Description: The VP/VS ratio is an important property for understanding magmatic and tectonic processes at passive continental margins as it is an indicator of the crustal composition. To classify the dominant lithologies in the Zhongsha Block, South China Sea (SCS), we present a detailed VP/VS crustal model based on the independent tomographic inversion of P wave and S wave data. The average VP/VS in the crust of the Zhongsha Block is ∼1.77, indicating an overall felsic to intermediate composition lacking remnant magmatic intrusive rocks. The VP-density relationship from gravity modeling suggests that the lower crust of the extended continental domain contains more greenschist and hence may have experienced metamorphism resulting from an elevated geotherm in the Northwest Sub-basin either during the syn-spreading or postspreading stage. The variability of the VP/VS ratio in the continental block is larger than that in the oceanic basin, showing distinct crustal properties. Several low VP/VS ratio anomalies (VP/VS 〈 1.7) were found near tectonic boundaries and are interpreted to either result from felsic metamorphism during an interval of rifting, or during the migration of magma along faults and cracks in the postrift period. VP/VS ratios occurring in concert with high VP anomalies in the continent-ocean transition zone support a mafic composition of metapelitic granulite, which was either formed by magmatic intrusions or contact with mantle melting that stem from the upwelling of the asthenospheric mantle during the initial break-up and onset of the seafloor spreading stage in the SCS.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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