The persistence and role of basin structures on the 3D architecture of the Maranon Fold-Thrust Belt, Peru

Scherrenberg, Arne F., Holcombe, Rodney J. and Rosenbaum, Gideon (2014) The persistence and role of basin structures on the 3D architecture of the Maranon Fold-Thrust Belt, Peru. Journal of South American Earth Sciences, 51 45-58. doi:10.1016/j.jsames.2013.12.007


Author Scherrenberg, Arne F.
Holcombe, Rodney J.
Rosenbaum, Gideon
Title The persistence and role of basin structures on the 3D architecture of the Maranon Fold-Thrust Belt, Peru
Formatted title
The persistence and role of basin structures on the 3D architecture of the Marañón Fold-Thrust Belt, Peru
Journal name Journal of South American Earth Sciences   Check publisher's open access policy
ISSN 0895-9811
1873-0647
Publication date 2014-04-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.jsames.2013.12.007
Volume 51
Start page 45
End page 58
Total pages 14
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
Highlights
• New field data shed light on the 3D architecture of the Marañón Fold-Thrust Belt.
• The Chonta Fault separates two domains that experienced different structural styles.
• Opposing vergences are linked to two separate regional deformation events.
• An inverted normal fault acted as a mechanical buttress during initial contraction.
• Basement-involved deformation overprinted earlier thin-skinned structures.

The 3D architecture of fold-thrust belts commonly involves thin-skinned and thick-skinned deformation. Both thick- and thin-skinned deformation styles have been suggested to occur in the Marañón Fold-Thrust Belt (MFTB) in Peru, but the relative timing and strain partitioning associated with them are not well understood. We demonstrate that inherited basement structures along the Peruvian convergent margin reactivated during the evolution of the MFTB. We present results from field mapping, interpretation of remote sensing imagery, and cross section construction and restoration. The results show that the Chonta Fault, a median pre-folding basin normal fault, was inverted and acted as a mechanical buttress during initial east-vergent contraction of the fold-thrust belt. This fault separates the belt into two domains of distinctly different structural styles. During the Eocene, units to the west of the Chonta Fault deformed by folding, using the fault as a buttress, and subsequently propagated eastward by thin-skinned thrusting. This was followed in the Miocene by west-vergent, basement-involved deformation, which overprinted the earlier east-vergent, thin-skinned structures. The proposed tectonic model of the MFTB highlights the role of basement-fault reactivation during orogenesis and the involvement of deep structures in partitioning deformation styles.
Keyword Marañón Fold-Thrust Belt
Thin-skinned deformation
Thick-skinned deformation
Peru
Andes
Maranon Fold-Thrust Belt
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 30 December 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2014 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 13 Feb 2014, 07:41:53 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences