Granitoid emplacement and deformation along a major crustal lineament: The Cordillera Blanca, Peru

Nick Petford, Michael P. Atherton

Research output: Contribution to Book/Report typesChapterResearchpeer-review

Abstract

The Cordillera Blanca Batholith and ignimbrites of the intermountain Callejon de Huaylas basin represent the last magmatic event in the Andean cycle of central-northern Peru. This most spectacular example of an extensional regime is characterised by acid magmatism spanning some 10 Ma, with both magma emplacement and subsequent deformation being fundamentally controlled by a ca. 300-km lineament known as the Cordillera Blanca fault complex. The western margin of the batholith has been strongly deformed by the Cordillera Blanca fault, resulting in a series of ductile to brittle structures that increase with intensity away from the relatively undeformed core towards the margin. The late-stage brittle fabrics are coeval with extensional structures in the Callejon de Huaylas basin, and relate to uplift and extension along the fault zone. The more ductile fabrics, as indicated by combined K-Ar and 40Ar-39Ar mineral dates, formed earlier in the intrusion history, and are consistent with emplacement into an active dextral (strike-slip) shear zone. The rapid uplift and high erosion rates seen from the Late Miocene onwards and the current state of stress in this region of thickened crust are due to gravitational instability (body forces) set up at high topographical levels, and buoyancy forces resulting from the intrusion of young, acid magmas at high crustal levels. © 1992.
Original languageEnglish
Title of host publicationTectonophysics
Pages171-185
Number of pages15
DOIs
Publication statusPublished - 30 Apr 1992

Publication series

NameTectonophysics
Volume205

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lineament
granitoid
cordillera
emplacement
batholith
uplift
acid
ignimbrite
erosion rate
basin
buoyancy
shear zone
fault zone
magmatism
magma
Miocene
crust
mineral
history
fabric

Cite this

Petford, Nick ; Atherton, Michael P. / Granitoid emplacement and deformation along a major crustal lineament: The Cordillera Blanca, Peru. Tectonophysics. 1992. pp. 171-185 (Tectonophysics).
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Granitoid emplacement and deformation along a major crustal lineament: The Cordillera Blanca, Peru. / Petford, Nick; Atherton, Michael P.

Tectonophysics. 1992. p. 171-185 (Tectonophysics; Vol. 205).

Research output: Contribution to Book/Report typesChapterResearchpeer-review

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