Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California

Daniel Brothers, Alistair Harding, Antonio Gonzlez-Fernndez, W. Steven Holbrook, Graham Kent, Neal Driscoll, John Fletcher, Dan Lizarralde, Paul J Umhoefer, Gary Axen

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Subduction of the Farallon plate beneath northwestern Mexico stalled by ∼12 Ma when the Pacific-Farallon spreading-ridge approached the subduction zone. Coupling between remnant slab and the overriding North American plate played an important role in the capture of the Baja California (BC) microplate by the Pacific Plate. Active-source seismic reflection and wide-angle seismic refraction profiles across southwestern BC (∼24.5N) are used to image the extent of remnant slab and study its impact on the overriding plate. We infer that the hot, buoyant slab detached ∼40 km landward of the fossil trench. Isostatic rebound following slab detachment uplifted the margin and exposed the Magdalena Shelf to wave-base erosion. Subsequent cooling, subsidence and transtensional opening along the shelf (starting ∼8 Ma) starved the fossil trench of terrigenous sediment input. Slab detachment and the resultant rebound of the margin provide a mechanism for rapid uplift and exhumation of forearc subduction complexes.

Original languageEnglish (US)
Article numberL09307
JournalGeophysical Research Letters
Volume39
Issue number9
DOIs
StatePublished - 2012

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Lower California (Mexico)
shelves
detachment
slab
slabs
fossils
trench
margins
subduction
fossil
North American plate
microplate
Mexico
subsidence
seismic refraction
Pacific plate
exhumation
seismic reflection
subduction zone
erosion

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Brothers, D., Harding, A., Gonzlez-Fernndez, A., Holbrook, W. S., Kent, G., Driscoll, N., ... Axen, G. (2012). Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California. Geophysical Research Letters, 39(9), [L09307]. https://doi.org/10.1029/2011GL050828

Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California. / Brothers, Daniel; Harding, Alistair; Gonzlez-Fernndez, Antonio; Holbrook, W. Steven; Kent, Graham; Driscoll, Neal; Fletcher, John; Lizarralde, Dan; Umhoefer, Paul J; Axen, Gary.

In: Geophysical Research Letters, Vol. 39, No. 9, L09307, 2012.

Research output: Contribution to journalArticle

Brothers, D, Harding, A, Gonzlez-Fernndez, A, Holbrook, WS, Kent, G, Driscoll, N, Fletcher, J, Lizarralde, D, Umhoefer, PJ & Axen, G 2012, 'Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California', Geophysical Research Letters, vol. 39, no. 9, L09307. https://doi.org/10.1029/2011GL050828
Brothers D, Harding A, Gonzlez-Fernndez A, Holbrook WS, Kent G, Driscoll N et al. Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California. Geophysical Research Letters. 2012;39(9). L09307. https://doi.org/10.1029/2011GL050828
Brothers, Daniel ; Harding, Alistair ; Gonzlez-Fernndez, Antonio ; Holbrook, W. Steven ; Kent, Graham ; Driscoll, Neal ; Fletcher, John ; Lizarralde, Dan ; Umhoefer, Paul J ; Axen, Gary. / Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California. In: Geophysical Research Letters. 2012 ; Vol. 39, No. 9.
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