Miocene fragmentation of the Central Andean foreland basins between 26 and 28°S

Zapata, S.; Sobel, Edward R.; Papa, Cecilia del; Muruaga, Claudia M; Zhou, Renjie

doi:10.1016/j.jsames.2019.102238

Cited by 17 publications

(27 citation statements)

References 49 publications

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“…Deformation in the northern Sierra Pampeanas started during the late Miocene by fragmentation of the former continuous foreland basin (Strecker et al, 1989;Bossi et al, 2001;Zapata et al, 2019), although some topography may have already existed before in its eastern part (Strecker et al, 1989;Zapata et al, 2019). Major relief development and range uplift occurred after 6 Ma along reverse fault-bounded basement blocks akin to the structures in the Eastern Cordillera and the Santa Barbara system (Strecker et al, 1989, Bossi et al, 2001Zapata et al, 2019). Folded and overthrusted Quaternary units in the eastern part document that deformation in this region continued during the Plio-Pleistocene (Strecker et al, 1989).…”

Section: Deformation History Of the Central Andesmentioning

confidence: 99%

“…The Sierra Aconquíja is a major orographic barrier for westward moisture-bearing winds from the foreland and receives more than 800 mm/a rainfall on its eastern flank (Sobel and Strecker, 2003). Major tectonically-driven surface uplift and relief development started after 6 Ma along high-angle reverse faults, intensified during the Pliocene and was most pronounced after 3 Ma (Strecker et al, 1989;Bossi et al, 2001;Zapata et al, 2019). Ensuing aridification of the adjacent intermontane basin to the west has occurred between 3 and 2.5 Ma as a result of the establishment of an efficient orographic barrier at that time (Kleinert and Strecker, 2001).…”

Section: Northern Segment (18 -28°s)mentioning

confidence: 99%

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The relationships between tectonics, climate and exhumation in the Central Andes (18–36°S): Evidence from low-temperature thermochronology

Stalder

Herman

Fellin

et al. 2020

Earth-Science Reviews

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The Central Andes between 18°S and 36°S latitude strike north-south for 2000 km along the Chilean subduction margin, cross several climate zones from hyperarid to humid and exhibit mean elevations in excess of 4000 m.a.s.l. Here, we investigate the relationships between tectonics, climate and exhumation by inverting low-temperature thermochronological data compiled from the literature (824 ages from 549 samples) and new data (238 ages from 146 samples) to quantify the exhumation rate history of the Central Andes since 80 Ma. Our inferred exhumation rates west of the drainage divide and between 18 and 32°S did not exceed 0.25 km/Ma. Such low exhumation rates are consistent with low shortening rates and arid conditions in this region. Local pulses of exhumation occurred only during the Eocene as 2 response to active deformation and during the Miocene, probably as response to uplift of the western Andean slope. East of the drainage divide between 18 and 28°S, the observed exhumation pattern reflects the onset and eastward propagation of deformation. Here, exhumation occurred locally since the middle-to-late Eocene in the Eastern Cordillera and the Altiplano-Puna and subsequently affected larger parts of these regions and the northwestern Sierra Pampeanas during the Oligocene. In the early Miocene (~20 Ma), the Interandean zone started exhuming and at 12-10 Ma exhumation propagated into the Subandean zone. Enhanced shortening rates and intensified precipitation along the eastern deformation front associated with the onset of the South American Monsoon led to increased exhumation rates in the eastern Interandean and the Subandean zones in the Plio-Pleistocene (0.6 km/Ma). Higher Pleistocene exhumation rates are also observed in the northern Sierra Pampeanas (1.5 km/Ma) that can be related to rock uplift along steep reverse faults coupled with high precipitation. South of 32°S on the western side, exhumation rates in the Principal Cordillera increased from ca. 0.25 km/Ma in the Miocene to rates locally exceeding 2 km/Ma in the Pleistocene. Whereas the tectonic regime in the southern Principal Cordillera remained unchanged since the late Miocene, these higher rates are likely associated with enhanced erosion resulting from intensified Pleistocene precipitation and glacial growth in this region, reinforced by isostatic rock uplift and active tectonics. Our study shows that the onset of exhumation correlates mainly with the initiation of horizontal shortening and crustal thickening, whereas the magnitude of exhumation is largely set by the amount of precipitation and glacial erosion and by the style of deformation, which is controlled by inherited structures and the amount of sediments in the foreland. In the following, we present new low-temperature thermochronological data (238 ages) that we complement with literature data (824 ages) to constrain the exhumation rate history of the Andean mountain belt at large temporal (Ma) and spatial scales (18 to 36°S). We focus on apatite and zircon fission track (AFT and ZFT, respe...

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Section: Deformation History Of the Central Andesmentioning

confidence: 99%

Section: Northern Segment (18 -28°s)mentioning

confidence: 99%

The relationships between tectonics, climate and exhumation in the Central Andes (18–36°S): Evidence from low-temperature thermochronology

Stalder

Herman

Fellin

et al. 2020

Earth-Science Reviews

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“…The High Sierras Pampeanas (HSP) comprises the Campo‐Arenal, El Cajon, and the Santa Maria elevated basins (~2,000 masl). The HSP sedimentary fill is characterized by Miocene to Pliocene coarsening‐up successions that unconformably overlie either Eocene to Oligocene sedimentary rocks or paleosurfaces (Zapata et al, 2019a, 2019b).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…(a) Central Andes sedimentary cover and geological provinces modified from Kley et al (1999). (b) Geological map of the study area modified from Dal Molin et al (2003) and González (2000), showing available thermochronology ages (Coughlin et al, 1999; Coutand et al, 2006; Löbens et al, 2013; Mortimer et al, 2007; Sobel & Strecker, 2003; Zapata et al, 2019b). Color code denotes ages; circles represent AFT, triangles are AHe, and dashed black squares contain the new ages presented in this contribution.…”

Section: Introductionmentioning

confidence: 99%

Upper Plate Controls on the Formation of Broken Foreland Basins in the Andean Retroarc Between 26°S and 28°S: From Cretaceous Rifting to Paleogene and Miocene Broken Foreland Basins

Zapata

Sobel

Papa

et al. 2020

Geochem Geophys Geosyst

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Marked along‐strike changes in stratigraphy, mountain belt morphology, basement exhumation, and deformation styles characterize the Andean retroarc; these changes have previously been related to spatiotemporal variations in the subduction angle. We modeled new apatite fission track and apatite (U‐Th‐Sm)/He data from nine ranges located between 26°S and 28°S. Using new and previously published data, we constructed a Cretaceous to Pliocene paleogeographic model that delineates a four‐stage tectonic evolution: extensional tectonics during the Cretaceous (120–75 Ma), the formation of a broken foreland basin between 55 and 30 Ma, reheating due to burial beneath sedimentary rocks (18–13 Ma), and deformation, exhumation, and surface uplift during the Late Miocene and the Pliocene (13–3 Ma). Our model highlights how preexisting upper plate structures control the deformation patterns of broken foreland basins. Because retroarc deformation predates flat‐slab subduction, we propose that slab anchoring may have been the precursor of Eocene–Oligocene compression in the Andean retroarc. Our model challenges models which consider broken foreland basins and retroarc deformation in the NW Argentinian Andes to be directly related to Miocene flat subduction.

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“…Bense et al () have suggested that most of the relief formation and rock exhumation took place during the Permo‐Triassic based on thermal modeling of these old thermochronologic ages. In contrast, several studies have proposed Miocene relief development based on the Miocene stratigraphic record and thermal modeling (Bense et al, ; Davila et al, ; Mortimer et al, ; Sobel & Strecker, ; Zapata et al, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Using a Paleosurface to Constrain Low‐Temperature Thermochronological Data: Tectonic Evolution of the Cuevas Range, Central Andes

et al. 2019

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Dispersion of low‐temperature thermochronologic data from nine samples collected on a deformed paleosurface preserved on the Cuevas range (Central Andes) can be exploited to unravel complex thermal histories. The nine samples yielded data that have both intersample and intrasample dispersions; the data set includes apatite fission‐track ages (180–110 Ma), mean track lengths (11–13 μm), apatite helium (10–250 Ma), and zircon helium ages (180–348 Ma). We ran inverse thermal history models for each sample that reveal spatial variations of the Miocene reheating along the paleosurface. Next, we ran a multiple‐sample joint model to infer a common form for thermal history for all samples. Our results suggest that initial exhumation during the Famatinian orogeny was followed by a residence between ~2.5 and 7.0 km depth during the Paleozoic and the Triassic. The onset of Mesozoic rifting was responsible for an increase of the geothermal gradient and extensive horst exhumation, which brought the basement of the Cuevas range close to the surface (~1–2 km) in the Late Jurassic. Between the Late Cretaceous and the Paleocene, the combination of low relief, a humid climate, and low erosion rates (0.006–0.030 km/Ma) facilitated the development of the Cuevas paleosurface. During the Miocene, this paleosurface experienced differential reheating with a high geothermal gradient (>25 °C/km) due to the sedimentary cover and local magmatic heat sources. During the Andean orogeny, in the Pliocene, the Cuevas paleosurface was deformed, exhumed, and uplifted.

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Miocene fragmentation of the Central Andean foreland basins between 26 and 28°S

Cited by 17 publications

References 49 publications

The relationships between tectonics, climate and exhumation in the Central Andes (18–36°S): Evidence from low-temperature thermochronology

The relationships between tectonics, climate and exhumation in the Central Andes (18–36°S): Evidence from low-temperature thermochronology

Upper Plate Controls on the Formation of Broken Foreland Basins in the Andean Retroarc Between 26°S and 28°S: From Cretaceous Rifting to Paleogene and Miocene Broken Foreland Basins

Using a Paleosurface to Constrain Low‐Temperature Thermochronological Data: Tectonic Evolution of the Cuevas Range, Central Andes

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