Field trip guide: Ridge-trench collision - The southern Patagonian Cordillera east of the Chile Triple Junction

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The southern Patagonian Cordillera south of the present location of the Chile Triple Junction (46.5°S) preserves distinctive deformational and backarc magmatic features that are a consequence of a series of northward-propagating ridge collision events that started at ca. 14 Ma. An abrupt increase of ∼2000 m of topographic elevation and the exhumation and uplift of mid-Miocene to Pliocene plutons within the cordillera south of the Chile Triple Junction is accomplished by horizontal compressive deformation (both thin- and thick-skinned) within the Patagonian fold-thrust belt. Ridge-trench collisions have formed asthenospheric slab windows beneath the southern Patagonian Cordillera. Backarc magmatism associated with slab window formation includes a distinctive suite of adakites and extensive outpourings of oceanic island basalt (OIB)-like plateau basalts. The adakites formed from the partial melting of the young, hot trailing edge of the Nazca plate that preceded slab window opening, whereas the OIB-like plateau basalts formed from dynamic asthenospheric flow as the slab windows opened up beneath the backarc.

Original languageEnglish
Title of host publicationGSA Field Guides
PublisherGeological Society of America
Pages1-22
Number of pages22
DOIs
StatePublished - 1 Jan 2008

Publication series

NameGSA Field Guides
Volume13

Fingerprint

triple junction
cordillera
trench
slab
collision
basalt
plateau
Nazca plate
exhumation
pluton
partial melting
magmatism
Pliocene
thrust
uplift
Miocene
fold

Keywords

  • Chile Triple Junction
  • Patagonia
  • Ridge-trench collision
  • Slab window
  • Southern Andes

Cite this

Gorring, Matthew. / Field trip guide : Ridge-trench collision - The southern Patagonian Cordillera east of the Chile Triple Junction. GSA Field Guides. Geological Society of America, 2008. pp. 1-22 (GSA Field Guides).
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Field trip guide : Ridge-trench collision - The southern Patagonian Cordillera east of the Chile Triple Junction. / Gorring, Matthew.

GSA Field Guides. Geological Society of America, 2008. p. 1-22 (GSA Field Guides; Vol. 13).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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