Thermotectonic history of the Marañón Fold-Thrust Belt, Peru: insights into mineralisation in an evolving orogen

Scherrenberg, Arne F., Kohn, Barry P., Holcombe, Rodney J. and Rosenbaum, Gideon (2016) Thermotectonic history of the Marañón Fold-Thrust Belt, Peru: insights into mineralisation in an evolving orogen. Tectonophysics, 667 16-36. doi:10.1016/j.tecto.2015.11.007


Author Scherrenberg, Arne F.
Kohn, Barry P.
Holcombe, Rodney J.
Rosenbaum, Gideon
Title Thermotectonic history of the Marañón Fold-Thrust Belt, Peru: insights into mineralisation in an evolving orogen
Journal name Tectonophysics   Check publisher's open access policy
ISSN 0040-1951
Publication date 2016-01-23
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.tecto.2015.11.007
Open Access Status Not Open Access
Volume 667
Start page 16
End page 36
Total pages 21
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 1908 Geophysics
1904 Earth-Surface Processes
Abstract Fold–thrust belts along convergent margins around the world host major ore deposits. The origin of such ore deposits is commonly episodic and so are the temporal and spatial variations in deformation styles in these fold–thrust belts. Here we focus on the Marañón Fold–Thrust Belt (MFTB) of the Peruvian Andes, and demonstrate a link between the spatio-temporal distribution of ore deposits and thick-skinned tectonics. We present low-temperature thermochronology results from the MFTB that document the uplift/exhumation history and timing of thick-skinned tectonics and vergence reversal. Our results suggest that the thermal history of the MFTB involved two discrete intervals of opposed-vergence, large-scale crustal deformation since the Late Cretaceous. An early interval, at ~ 80–20 Ma, was associated with folding and east-vergent thin-skinned tectonics, and was followed by west-vergent thick-skinned deformation at ~ 20–0 Ma. Furthermore, our findings suggest that thick-skinned contraction was coincident with increased focusing of mineralising fluids and ore deposition in the MFTB during the early Miocene, and in the mid-Miocene both mineralisation and deformation were enhanced by subduction of the Nazca Ridge underneath the South American Plate.
Formatted abstract
Fold-thrust belts along convergent margins around the world host major ore deposits. The origin of such ore deposits is commonly episodic and so are the temporal and spatial variations in deformation styles in these fold-thrust belts. Here we focus on the Marañón Fold-Thrust Belt (MFTB) of the Peruvian Andes, and demonstrate a link between the spatio-temporal distribution of ore deposits and thick-skinned tectonics. We present low-temperature thermochronology results from the MFTB that document the uplift/exhumation history and timing of thick-skinned tectonics and vergence reversal. Our results suggest that the thermal history of the MFTB involved two discrete intervals of opposed-vergence, large-scale crustal deformation since the Late Cretaceous. An early interval, at ~ 80-20 Ma, was associated with folding and east-vergent thin-skinned tectonics, and was followed by west-vergent thick-skinned deformation at ~ 20-0 Ma. Furthermore, our findings suggest that thick-skinned contraction was coincident with increased focusing of mineralising fluids and ore deposition in the MFTB during the early Miocene, and in the mid-Miocene both mineralisation and deformation were enhanced by subduction of the Nazca Ridge underneath the South American Plate
Keyword MFTB
Marañón Fold-Thrust Belt
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Papers
Official 2016 Collection
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Mon, 30 Nov 2015, 06:02:51 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences