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Pure and Applied Geophysics

, Volume 168, Issue 8–9, pp 1391–1413 | Cite as

The Mid-Rivera-Transform Discordance: Morphology and Tectonic Development

  • William L. BandyEmail author
  • François Michaud
  • Carlos A. Mortera Gutiérrez
  • Jérôme Dyment
  • Jacques Bourgois
  • Jean-Yves Royer
  • Thierry Calmus
  • Marc Sosson
  • Jose Ortega-Ramirez
Article

Abstract

To better define the morphotectonic elements and tectonic development of the Mid-Rivera-Transform Discordance, multibeam bathymetric, seafloor backscatter, multichannel seismic reflection and total field marine magnetic data were collected along the entire Rivera Transform west of 107°W during the BART and FAMEX campaigns of the N.O. L’Atalante conducted in 2002. These data show that, although the transform tectonized zone of the Rivera Transform west of 107°30′W is a single continuous morphologic basin, this basin consists of two distinct morphotectonic domains: an eastern domain which morphologically is a deep rhombochasm within which organized seafloor spreading has occurred, and a western ‘leaky transform’ domain. These new data, in conjunction with the results of previous studies, support the idea that the Rivera-Pacific Euler pole is migrating southward towards the eastern half of the Rivera Transform, and further indicate a recent (<0.14 Ma), and most likely ongoing, clockwise reorganization of the principle transform displacement zones of the Rivera Transform west of 108°W. We propose that the Mid-Rivera-Transform Discordance owes its origin to this eastward progressing, clockwise reorganization of the transform segments that is occurring in response to recent changes in Rivera-Pacific relative plate motion.

Keywords

Rivera Transform Plate motions Morphology Multi-beam bathymetry 

Notes

Acknowledgments

We thank the captain and crew of N/O L’Atalante and the staff of the ship operations section of IFREMER for their valuable assistance. We also thank the two anonymous reviewers for their comments which have improved the manuscript. Financial support was provided by Centre National de la Recherche Scientifique (CNRS), and by CONACyT grants 36681-T, #50235, R34906-T and 25709T, and UNAM DGAPA grants # IN104707, IN114602, IX117504, IN104199, IN110897, IN108110 and IX111304.

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Copyright information

© Springer Basel AG 2010

Authors and Affiliations

  • William L. Bandy
    • 1
    Email author
  • François Michaud
    • 2
  • Carlos A. Mortera Gutiérrez
    • 1
  • Jérôme Dyment
    • 3
  • Jacques Bourgois
    • 4
  • Jean-Yves Royer
    • 5
  • Thierry Calmus
    • 6
  • Marc Sosson
    • 2
  • Jose Ortega-Ramirez
    • 7
  1. 1.Instituto de GeofísicaUniversidad Nacional Autónoma de MéxicoMéxico D.FMéxico
  2. 2.Géosciences AzurVillefranche-sur-MerFrance
  3. 3.Institut de Physique du Globe de ParisParisFrance
  4. 4.Institut des Sciences de la Terre Paris (ISTEP), UPMC-CNRSUniversité Pierre et Marie CurieParisFrance
  5. 5.CNRS, Domaines Océaniques, Institut Universitaire Européen de la MerPlouzanéFrance
  6. 6.ERNO, Instituto de GeologíaUniversidad Nacional Autónoma de MéxicoHermosilloMéxico
  7. 7.Geophysics LaboratoryInstituto Nacional de Antropología e HistoriaMéxico D.FMéxico

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