thumbnail

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

Geophysical Research Letters

By:
, , , , , , , , ,
DOI: 10.1029/2011GL050828

Links

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 (~24.5°N) 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.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Farallon slab detachment and deformation of the Magdalena Shelf, southern Baja California
Series title:
Geophysical Research Letters
DOI:
10.1029/2011GL050828
Volume
39
Issue:
9
Year Published:
2012
Language:
English
Publisher:
Wiley
Contributing office(s):
Woods Hole Coastal and Marine Science Center
Description:
L09307
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
Country:
Mexico
State:
Baja California