Raw data from a wide-angle seismic survey offshore French Guyana and Surinam

Date 2021-08-30
Temporal extent 2016-10-21 -2016-11-15
Author(s) Klingelhoefer FraukeORCID1, Roest WalterORCID1, Graindorge David2
Affiliation(s) 1 : Ifremer, Geosciences Marines, ZI de la Pointe de Diable, 29280 Plouzané
2 : UMR6538, Domaines Océaniques, European Institute for Marine, Université
DOI 10.17882/79396
Publisher SEANOE
Keyword(s) Demerara Plateau, Wide-angle seismic data, french Guyana and Surinam

This archive includes wide-angle seismic data from profiles 1, 2, 3 and 2 of the MARGATS cruise offshore French Guyana and Surinam including navigation files. The objective is more precisely to characterize the crustal structure and evolution of marginal plateaux, sub-marine reliefs that are associated to 30 % of the transform margins in the world. These reliefs are systematically observed at the junction of different ages in relay zones between divergent and transform segments. Their building remains enigmatic although they represent reliefs established in geodynamical nubs that are keys ton understand the localisation of transform margins. This project MARGATS intend to image the deep structure of the marginal plateau (wide angle seismic and multichannel seismic MCS). The experimental site proposed is the Demerara plateau offshore French Guyana and Surinam and located at the junction between Central Atlantic locally opened in a divergent mode and Equatorial Atlantic opened mainly in transform mode in the area. Hence, this plateau has recorded at its different borders the divergent opening of the central Atlantic and the tranform opening of the Equatorial Atlantic. It may be this situation itself that leads to the formation of the plateau, but it requires to precisely constraint its deep internal structure. Finally the Demerara plateau is one of the more studied with petroleum seismic data and high resolution seismic data. It is then one of the ideal place to conduct a high resolution wide-angle deep seismic survey.

Licence CC-BY-NC-SA
Utilisation Although all data in this archive have been used by the authors, no warranty, expressed or implied, is made as to the accuracy of the data and/or related materials.
Acknowledgements We would like to thank the captain and the crew of R/V L'Atalante as well as the technical team of Genavir and Ifremer for their help in data acquisition during the MARGATS cruise. We also acknowledge Région Bretagne and Ifremer for funding the PhD scholarship associated with this cruise.
Sensor metadata

The ocean bottom seismometers (OBS) have been developed by Ifremer (French Research Institute for Exploitation of the Sea). For the first time, the acquisition and release electronics have been integrated to decrease the size, weight and cost of the equipment. Downloading of data by USB cable and recharging of batteries is accomplished from the outside allowing redeployment of the equipment without opening the glass sphere. 

Auffret, Y., Pelleau, P., Klingelhoefer, F., Geli, L., Crozon, J., Lin, J. Y., & Sibuet, J. C. (2004). MicrOBS: A new generation of ocean bottom seismometer. First Break, 22(7).

File Size Format Processing Access
obs locations of the profile MAR 01 3 KB TEXTE Processed data Open access
obs locations of the profile MAR 02 1 KB TEXTE Processed data Open access
Shotfile for the MARGATS profile 01 108 KB TEXTE Processed data Open access
Shotfile for the MARGATS profile 02 227 KB TEXTE Processed data Open access
MAR01 10 GB segy Raw data Open access
MAR02 16 GB seggy Raw data Open access
MAR03 15 GB seggy Raw data Open access
MAR04 11 GB seggy Raw data Open access
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How to cite 

Klingelhoefer Frauke, Roest Walter, Graindorge David (2021). Raw data from a wide-angle seismic survey offshore French Guyana and Surinam. SEANOE. https://doi.org/10.17882/79396

In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :

Museur Thomas, Graindorge David, Klingelhoefer Frauke, Roest Walter, Basile C., Loncke L., Sapin F. (2021). Deep structure of the Demerara Plateau: From a volcanic margin to a Transform Marginal Plateau. Tectonophysics, 803, 228645 (22p.). Publisher's official version : https://doi.org/10.1016/j.tecto.2020.228645 , Open Access version : https://archimer.ifremer.fr/doc/00658/77014/