Late Miocene upper-crustal deformation within the interior of the southern puna plateau, central Andes

Zhou, Renjie and Schoenbohm, Lindsay M. (2015) Late Miocene upper-crustal deformation within the interior of the southern puna plateau, central Andes. Lithosphere, 7 3: 336-352. doi:10.1130/L396.1


Author Zhou, Renjie
Schoenbohm, Lindsay M.
Title Late Miocene upper-crustal deformation within the interior of the southern puna plateau, central Andes
Journal name Lithosphere   Check publisher's open access policy
ISSN 1947-4253
1941-8264
Publication date 2015-06-01
Sub-type Article (original research)
DOI 10.1130/L396.1
Open Access Status Not yet assessed
Volume 7
Issue 3
Start page 336
End page 352
Total pages 17
Place of publication Boulder, CO, United States
Publisher Geological Society of America
Language eng
Formatted abstract
The origin and evolution of the central Andes, a noncollisional orogenic system, have been hypothesized to evolve as a result of several dynamic processes, including formation of an eastward-propagating orogenic wedge, segmentation into rhomb-shaped basins as a result of N-S gradients in crustal shortening, reactivation of inherited deep structures, and lithospheric foundering. How these proposed processes dominate the orogen spatially and temporally is uncertain; however, constraining the timing of upper-crustal deformation is critical for investigating these models. We document the formation and deformation of the Pasto Ventura basin (NW Argentina) in the southern Puna Plateau. Through field mapping, deformation analysis, secondary ion mass spectrometry U-Pb dating of zircon from interbedded volcanic ashes, and 40Ar/39Ar geochronology of volcanics, we show that major basin formation started ca. 11.7–10.5 Ma and continued until at least ca. 7.8 Ma. The basin underwent syndepositional faulting and folding from ca. 10 to 8 Ma. Contractional deformation in the Pasto Ventura basin ended between ca. 7.3 and 4 Ma, based on the onset of regional horizontal extension. Data from the Pasto Ventura region allow us to bridge existing data and complete a regional compilation of upper-crustal deformation for the Puna Plateau. Our analysis shows that late Miocene formation and deformation of the Pasto Ventura basin represent an important out-of-sequence contractional event in the southern Puna Plateau. While a number of geodynamic processes likely shape the evolution of the southern Puna, multidisciplinary data sets, including deformation in the Pasto Ventura basin studied here, highlight the role of the formation and detachment of a late Miocene lithospheric drip in causing the upper-crustal deformation on the southern Puna Plateau since the mid–late Miocene.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth and Environmental Sciences
 
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Created: Wed, 05 Apr 2017, 16:22:28 EST by Renjie Zhou on behalf of Learning and Research Services (UQ Library)