Growth of the Central Andean Plateau by Tectonic Segmentation Is Controlled by the Gradient in Crustal Shortening

Riller, Ulrich; Oncken, Onno

doi:10.1086/373974

Cited by 91 publications

(130 citation statements)

References 43 publications

Supporting

Mentioning

119

Contrasting

Order By: Relevance

“…Line rotation and rotation associated with tangential shear sum up to the net rotation of points along the directions of maximum tangential shear. A similar model has been successfully applied to explain the Cenozoic Central Andean plateau growth pattern [Riller and Oncken, 2003]. …”

Section: Rosenau Et Al: Southern Andrean Kinematicsmentioning

confidence: 99%

Kinematic constraints on intra‐arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude

2006

View full text Add to dashboard Cite

[1] On the basis of structural field work, fault kinematic analysis, and the analysis of digital imagery, we describe the northern part of the southern Andean intra-arc Liquiñe-Ofqui Fault Zone (LOFZ) as an SC-like fault zone system accommodating part of the Nazca-South American plate convergence obliquity. Kinematic modeling suggests that the LOFZ accommodated 124 (+24/À21) km of dextral displacement between 40°S and 42°S and 67 (+13/À11) km between 38°S and 40°S since the Pliocene. Associated vertical axis rotations are 31 ± 4°c lockwise and 9 ± 1°counterclockwise along synthetic and antithetic faults, respectively. Mean Pliocene to recent shear rates along the LOFZ decrease northward from 32 ± 6 mm/yr to 13 ± 3 mm/yr compatible with partitioning of half of the convergence obliquity into the intra-arc zone north of 40°S and complete partitioning to the south. The displacement gradient along the intra-arc zone results in margin-parallel shortening of the fore arc.

show abstract

Section: Rosenau Et Al: Southern Andrean Kinematicsmentioning

confidence: 99%

Kinematic constraints on intra‐arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude

2006

View full text Add to dashboard Cite

show abstract

“…According to a first model (Marrett & Strecker, 2000), the fault sets were generated at different times due to polyphase compressional tectonics, probably reflecting a change in plate convergence (from NW -SE to ENE -WSW), which occurred at about 4 Ma. Alternatively, a second model supports a heterogeneous deformation of the upper crust and a simultaneous activation of these differently oriented faults (Riller & Oncken, 2003;Riller et al, 2012). Among these fault sets, the more prominent ones in the Laguna Blanca area are N-S striking faults extending for tens of kilometres.…”

Section: Structural Frameworkmentioning

confidence: 96%

“…The South Central Andean plateau is characterized by three sets of major faults having N-S (orogen-parallel), NW -SE and NE -SW orientations (Allmendinger, 1986;Marrett & Strecker, 2000;Riller & Oncken, 2003). The Neogene tectonic activity of these faults is still a debated topic.…”

Section: Structural Frameworkmentioning

confidence: 99%

“…These orogen-parallel structures, frequently set on pre-Neogene elements (i.e. northerly trending Paleozoic deformation belts and normal faults of the Cretaceous rifting phase), were activated during the Neogene principally as reverse faults (Riller & Oncken, 2003). Nevertheless, the sinistral strike-slip component on orogen-parallel faults has also been inferred, as in the case of the N-S striking faults delimiting the Salina del Fraille pull-apart basin (Dooley & McClay, 1997), at about 140 km NW of the Laguna Blanca basin (Figure 4(a) and (b)).…”

Section: Structural Frameworkmentioning

confidence: 99%

“…Salina del Fraille pull-apart basin, Dooley & McClay, 1997). Such kinematics along N-S striking faults is apparently not coherent with the ENE -WSW convergence between the Nazca and South America plates and several models have been proposed to explain this unexpected behaviour (Marrett & Strecker, 2000;Riller, Cruden, Boutelier, & Schrank, 2012;Riller & Oncken, 2003). Therefore, it is of paramount importance to clarify the geometries, kinematics and genesis of intermontane transtensional basins in the Andean belt, in order to disentangle such a long debated issue.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Geo-structural map of the Laguna Blanca basin (Southern Central Andes, Catamarca, Argentina)

2015

View full text Add to dashboard Cite

The Laguna Blanca basin is a rhomb-shaped basin located at the SE margin of the Puna plateau in the southern Central Andes (Catamarca, Argentina). An interactive analysis using remote sensing and field mapping enabled us to produce a geo-structural map at a 1:350,000 scale. Satellite images from multispectral sensors (ASTER and Landsat 7 ETM+) and medium resolution Digital Elevation Models (SRTM and ASTER GDEM) were used in order to recognize the structures and main lithologies, which were validated in the field and through laboratory tests (e.g. spectral analysis). The final result is a geo-structural map of the Laguna Blanca basin with a new geological unit subdivision, highlighting its tectonic origin, which appears to be related to a releasing stepover along N-S sinistral strike-slip master faults.

show abstract

Central Andean mantle and crustal seismicity beneath the Southern Puna plateau and the northern margin of the Chilean‐Pampean flat slab

et al. 2014

View full text Add to dashboard Cite

Earthquake hypocenters recorded in the Andean Southern Puna seismic array (25-28°S, 70-65°W) provide new constraints on the shape of the subducting Nazca plate beneath the Puna plateau, the transition into the Chilean-Pampean flat slab and the thermal state of the mantle and crust. Some 270 new mantle hypocenters suggest that the subducting slab under the Puna shoals into the flat-slab segment more abruptly and farther to the north than previously indicated. The revised geometry is consistent with the Central Volcanic Zone Incapillo caldera being the southernmost center with Pleistocene activity until reaching the southern side of the flat-slab region. Evidence for the revised slab geometry includes three well-defined hypocenter clusters in the Pipanaco nest (27.5-29°S, 68-66°W), which are interpreted to reflect slab-bending stresses. A few low-magnitude earthquakes with strongly attenuated S waves in the long-recognized Antofalla teleseismic gap (25.5-27.5°S) support a continuous slab under the Southern Puna. The paucity of gap earthquakes and the presence of mafic magmas are consistent with a hot mantle wedge reflecting recent lithospheric delamination. Evidence for a hot overlaying Puna crust comes from new crustal earthquake hypocenters concentrated at depths shallower than 5 km. Two notable short-duration swarms were recorded under the resurgent dome of the~2 Ma back-arc Cerro Galán caldera and the near-arc Cerro Torta dome. New crustal earthquake focal mechanisms from 17 events in the array along with two existing mechanisms have strike slip, oblique reverse, and oblique normal solutions fitting with regional E-W compression and N-S extension.

show abstract

Growth of the Central Andean Plateau by Tectonic Segmentation Is Controlled by the Gradient in Crustal Shortening

Cited by 91 publications

References 43 publications

Kinematic constraints on intra‐arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude

Kinematic constraints on intra‐arc shear and strain partitioning in the southern Andes between 38°S and 42°S latitude

Geo-structural map of the Laguna Blanca basin (Southern Central Andes, Catamarca, Argentina)

Central Andean mantle and crustal seismicity beneath the Southern Puna plateau and the northern margin of the Chilean‐Pampean flat slab

Contact Info

Product

Resources

About