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  • 1
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    (Table 1, page 76) 10Be concentration in manganese nodules from the Madeira Abyssal Plain, Atlantic Ocean (2018)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Keywords: 86B12; APNAP1; Atlantic Ocean; BC; Beryllium-10; Beryllium-10, standard deviation; Box corer; Deposit type; DEPTH, sediment/rock; DISTANCE; Distance, maximum; Distance, minimum; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; T86-B12; Tyro
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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    DATA PANGAEA
  • 2
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    Geochemistry on sediment and nodules from the Madeira Abyssal Plain (1991)
    PANGAEA
    In:  Supplement to: Ebbing, J; van der Borg, Klaas; de Jong, Arie F M; Nederlof, H P (1991): Continuous surface dwelling of manganese nodules on a hill on the Madeira Abyssal Plain during abrupt sedimentation changes. Marine Geology, 98(1), 73-82, https://doi.org/10.1016/0025-3227(91)90036-4
    Details
    Publication Date: 2023-08-28
    Description: The accretion rate of manganese nodules and the sedimentation rate of the underlying sediment has been studied with 10Be and 14C on a nodule covered hill in the Madeira Abyssal Plain. The accretion rate of (3.2 +/- 0.6) mm/Ma for the nodules is considerably smaller than the average sedimentation rate of 12 mm/ka for the last 50-100 ka. The mechanism that kept the nodules at the surface in this specific environment during the last 40 ka is likely to be flotation. The discovery of a large manganese-covered concretion in a piston core points to a long period of sediment winnowing. The 14C analyses also seem to point to an increase in the sedimentation rate round 6500 yrs B.P.
    Keywords: NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 3
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    (Table 1, page 76) 10Be concentration in a manganese coating and sediment from the Madeira Abyssal Plain, Atlantic Ocean (1991)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Keywords: 86B12; 86PCM14; APNAP1; Atlantic Ocean; BC; Beryllium-10; Beryllium-10, standard deviation; Box corer; Deposit type; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; Identification; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; PC; Piston corer; T86-B12; T86-P14; Tyro
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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    DATA PANGAEA
  • 4
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    (Table 3, page 78) Element composition versus depth of layers inside manganese nodules of the Madeira Abyssal Plain (1991)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: 86B12; Aluminium; APNAP1; Atlantic Ocean; BC; Box corer; Calcium; Cobalt; Copper; Deposit type; DEPTH, sediment/rock; DISTANCE; Distance, maximum; Distance, minimum; Identification; Inductively coupled plasma atomic emission spectroscope (ICP-AES); Iron; Lithium; Magnesium; Manganese; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Potassium; Sodium; Strontium; Sulfur, total; T86-B12; Titanium; Tyro; Vanadium; X-ray fluorescence (XRF); Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 200 data points
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    DATA PANGAEA
  • 5
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    (Table 4, page 80) Element composition versus depth inside sediment cores taken from the Madeira Abyssal Plain (1991)
    PANGAEA
    Details
    Publication Date: 2024-04-16
    Keywords: 86B12; 86PCM14; Aluminium; APNAP1; Atlantic Ocean; BC; Box corer; Calcium; Cobalt; Copper; Deposit type; DEPTH, sediment/rock; Event label; Identification; Inductively coupled plasma atomic emission spectroscope (ICP-AES); Iron; Lithium; Magnesium; Manganese; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; PC; Piston corer; Potassium; Silicon; Sodium; Strontium; Sulfur, total; T86-B12; T86-P14; Titanium; Tyro; Vanadium; X-ray fluorescence (XRF); Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 760 data points
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    DATA PANGAEA
  • 6
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    Topo-Europe as seen from the Top of Europe - Towards a 4D topographic view of the North Atlantic continental margin. Topo-Europe Exploratory Workshop (2005)
    In:  Budapest, Hungary
    Details
    Publication Date: 2005
    Keywords: CC 1/3 ; Coordinating Committee ; TOPO-EUROPE
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    BIBLIOGRAPHY ILP
  • 7
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    LITHOSPHERIC STRUCTURE OF THE WEST AND CENTRAL AFRICAN RIFT SYSTEM FROM REGIONAL THREE-DIMENSIONAL GRAVITY MODELLING (2015)
    Geological Society of South Africa (GSSA)
    Details
    Publication Date: 2015-09-12
    Description: A three-dimensional interpretation of the central part of the West and Central African Rift System (WCARS) is presented using the Earth Gravity Model 2008 (EGM2008). The 3-D model presented here provides new insights into the regional lithospheric structure of the central sector of the WCARS. The 3-D model reveals a possible crustal thickness and density distribution beneath the rift system, and the depth extent of magmatic activity in the Benue Trough is revealed for the first time. Because of asthenospheric uplift, the crust under the Benue Trough is thinned. The zone of crustal thinning (〈30 km) coincides with the trace of an intrusion beneath the trough, and the maximum of which is attained in the Yola Basin. The Adamawa and Kapsiki Plateaus, on the other hand, show by far the largest crustal thickness in the region (34 to 36 km). The inferred zone of intrusion coincides with the maximum gravity anomaly of the rift zone. The great depth (ca. 14 km) to the top of the intrusion along the rift may explain the absence of magmatism in the Benue Trough compared to the Cameroon Volcanic Line (CVL) or the East African Rift System (EARS). The relatively small nature of the intrusion leads to the conclusion that small-scale asthenospheric upwelling might be responsible for the thinning of the crust and subsequent rifting of the Benue Trough.
    Print ISSN: 1012-0750
    Topics: Geosciences
    Published by Geological Society of South Africa (GSSA)
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  • 8
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    Importance of far-field topographic and isostatic corrections for regional density modelling (2016)
    Oxford University Press
    Details
    Publication Date: 2016-08-27
    Description: The long-wavelength gravity field contains information about processes in the sublithospheric mantle. As satellite-derived gravity models now provide the long to medium-wavelength gravity field at unprecedented accuracy, techniques used to process gravity data need to be updated. We show that when determining these long-wavelengths, the treatment of topographic-isostatic effect (TIE) and isostatic effects (IE) is a likely source of error. We constructed a global isostatic model and calculated global TIE and IE. These calculations were done for ground stations as well as stations at satellite height. We considered both gravity and gravity gradients. Using these results, we determined how much of the gravity signal comes from distant sources. We find that a significant long-wavelength bias is introduced if far-field effects on the topographic effect are neglected. However, due to isostatic compensation far-field effects of the topographic effect are to a large degree compensated by the far-field IE. This means that far-field effects can be reduced effectively by always considering topographic masses together with their compensating isostatic masses. We show that to correctly represent the ultra-long wavelengths, a global background model should be used. This is demonstrated both globally and for a continental-scale case area in North America. In the case of regional modelling, where the ultra-long wavelengths are not of prime importance, gravity gradients can be used to help minimize correction errors caused by far-field effects.
    Keywords: Gravity, Geodesy and Tides
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 9
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    The East Greenland Caledonides--teleseismic signature, gravity and isostasy (2015)
    Oxford University Press
    Details
    Publication Date: 2015-10-16
    Description: The large-scale geological evolution of the North Atlantic Realm during the past 450 Myr is largely understood, but crucial elements remain uncertain. These involve the Caledonian orogeny, the formation of the North Atlantic and accompanying igneous activity, and the present-day high topography surrounding the North Atlantic. Teleseismic receiver function interpretation in the Central Fjord Region of East Greenland recently suggested the presence of a fossil Caledonian subduction complex, including a slab of eclogitised mafic crust and an overlying wedge of serpentinised mantle peridotite. Here we further investigate this topic using inverse receiver functions modelling. The obtained velocity models are tested with regard to their consistency with the regional gravity field and topography. We find that the obtained receiver function model is generally consistent with gravity and isostasy. The western part of the section, with topography of 〉1000 m, is clearly supported by the 40-km-thick crust. The eastern part requires additional buoyancy as provided by the hydrated mantle wedge. The geometry, velocities and densities are consistent with interpretation of the lithospheric structure as a fossil subduction zone complex. The spatial relations with Caledonian structures suggest a Caledonian origin. The results indicate that topography is isostatically compensated by density variations within the lithosphere, and that significant dynamic topography is not required at the present-day.
    Keywords: Geodynamics and Tectonics
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 10
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    An isostatic study of the Karoo basin and underlying lithosphere in 3-D (2016)
    Oxford University Press
    Details
    Publication Date: 2016-06-01
    Description: A 3-D density model of the crust and upper mantle beneath the Karoo basin is presented here. The model is constrained using potential field, borehole and seismic data. Uplift of the basin by the end of the Cretaceous has resulted in an unusually high plateau (〉1000 m) covering a large portion of South Africa. Isostatic studies show the topography is largely compensated by changes in Moho depths (~35 km on-craton and 〉45 km off-craton) and changes in lithospheric mantle densities between the Kaapvaal Craton and surrounding regions (~50 kg m –3 increase from on- to off-craton). This density contrast is determined by inverted satellite gravity and gravity gradient data. The highest topography along the edge of the plateau (〉1200 m) and a strong Bouguer gravity low over Lesotho, however, can only be explained by a buoyant asthenosphere with a density decrease of around 40 kg m –3 .
    Keywords: Gravity, Geodesy and Tides
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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