Regional relative tectonic activity of structures in the Pampean flat slab segment of Argentina from 30 to 32°S

Rimando, Jeremy; Schoenbohm, Lindsay M.

doi:10.1016/j.geomorph.2019.106908

Cited by 17 publications

(19 citation statements)

References 118 publications

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“…The average dip-slip rate of the LCFZ of ∼0.3-0.4 mm/yr is still lower than the ∼1.1, ∼0.5, and ∼0.9-1.5 mm/yr dip-slip rates of the La Laja, La Rinconada, and Las Tapias faults, respectively, in the easternmost Precordillera. Therefore, similar to the findings of the relative tectonic activity assessment study by Rimando and Schoenbohm (2020), it appears that W-E shortening gradient shown by the decadal GPS velocity field reflects the longer-term gradient in slip rates of faults across the Pampean flat-slab segment.…”

Section: Late Quaternary Activity Of the Las Chacras Fault Zonesupporting

confidence: 78%

“…Although unmeasured, shortening rate on the Western Pie de Palo Fault may be similar (labelled as PdPW on Figure 1b). While its sinuous mountain front, higher valley-floor-width to height ratios, and lower rates of seismicity suggest lower activity than along the eastern side of the range (Figure 11), most other geomorphic indices used to characterize relative slip rates seem to be indistinguishable for both sides of the Pie de Palo (Rimando & Schoenbohm, 2020). The average shortening rate along the LCFZ (approximate location labelled as VF on Figure 1b) is ∼0.2 mm/yr since ∼36-50 ka according to our study.…”

Section: Late Quaternary Activity Of the Las Chacras Fault Zonementioning

confidence: 99%

“…Both regional geomorphic studies (Rimando & Schoenbohm, 2020) and GPS studies (Brooks et al, 2003, and references therein) suggest that shortening rates decrease from west to east. GPS studies (Brooks et al, 2003, and references therein) provide the quantitative shortening rate estimates (4.5 ± 1.7 mm/yr across the Andean orogenic front).…”

Section: Late Quaternary Activity Of the Las Chacras Fault Zonementioning

confidence: 99%

“…Data in this study were uploaded into the open-access Zenodo repository: Las Chacras Fault Zone, Argentina cosmogenic surface exposure ages. https://doi.org/10.5281/zenodo.4476736 (Rimando, 2020).…”

Section: Data Availability Statementmentioning

confidence: 99%

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Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

et al. 2021

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Quaternary Andean backarc deformation within the Pampean segment (27-33.5°S) related to the convergence of the Nazca and South American plates is widely distributed, extending up to 700 km east from the Perú-Chile trench (Figure 1a). The plate margin encompasses the thin-skinned fold-and-thrust belts of the Andean Main Cordillera, Frontal Cordillera, and Precordillera in the west, and the thick-skinned reverse faults of the Sierras Pampeanas in the east (Figure 1b). This wide distribution and partitioning of deformation among structures with different tectonic styles has been associated with subduction of a shallowly dipping section of the Nazca plate at these latitudes, known as the Pampean flat-slab segment (Figure 1b;

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Section: Late Quaternary Activity Of the Las Chacras Fault Zonesupporting

confidence: 78%

Section: Late Quaternary Activity Of the Las Chacras Fault Zonementioning

confidence: 99%

Section: Late Quaternary Activity Of the Las Chacras Fault Zonementioning

confidence: 99%

Section: Data Availability Statementmentioning

confidence: 99%

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Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

et al. 2021

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“…Because of the widespread availability of high‐quality DEMs and geographic information system (GIS) software, the analysis of geomorphic indices has been an important method for evaluating the relative tectonic activity along fault zones (Cheng et al., 2018; Hamdouni et al., 2008; Ntokos et al., 2016; Rimando & Schoenbohm, 2020; Yıldırım, 2014). To better depict the along‐strike variations in fault activity, we carried out a geomorphic analysis on the footwall block of the YTF, based on the 30 m‐resolution ASTER GDEM (V2).…”

Section: Methodsmentioning

confidence: 99%

Slip Distribution and Footwall Topography of the Yanggao‐Tianzhen Fault (Northern Shanxi Graben): Implications for the Along‐Strike Variations in Fault Activity and Regional Deformation

Luo

et al. 2021

Tectonics

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Geomorphic signatures of neotectonic activity along the Western Andean Front in the Chilean Andes (35°S to 37°S)

Oviedo‐Reyes,

Cortés‐Aranda,

Fernandez

et al. 2024

Earth Surf Processes Landf

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Characterizing neotectonic activity along mountain fronts in active orogens is the key to better understanding trajectories of landscape evolution, climatic‐tectonic couplings and natural hazards. One such prominent mountain front is the Western Andean Front (WAF), which defines the boundary between two main physiographic units along the Chilean Andes (15°S to 39°S): the Central Depression and Principal Cordillera. This study analyses the geomorphic imprints of neotectonic fault activity in the WAF between 35°S and 37°S. We used several topographic metrics, including the mountain‐front sinuosity index (Smf), the valley floor width‐to‐height ratio (Vf) and the stream length‐gradient (SL) index to gain information about the regional distribution of deformation patterns and its relative tectonic activity for distinctive segments. In addition, a raster map combining rock strength (RS) and mean annual precipitation (MAP) allowed discriminating lithology‐climate vs. tectonics influence on SL anomalies from catchments spanning from the main deformation zone to the regional drainage divide. We use the local relief and swath profiles to quantify the incision and transient state of mountain fronts to evaluate the geomorphic response to tectonic and/or climatic input. Our analysis highlights significant variations from north to south, delineating two distinct segments with different topographic, geomorphic and geometric fault characteristics. These segments are indented at approximately 36°S. From north to south, there is a segment with an inactive thrust front with a primarily climate‐driven fluvial response over long timescales and a second segment with a transient state adjusting to relatively high uplift rates. Morphometric data analysis, DEM‐based morpho‐structural maps, geological maps and previous research support the interpretation of two sets of neotectonic faults: (1) NNE‐striking reverse faults with a dextral slip component and (2) NW‐striking sinistral slip faults, likely a response to deformation partitioning caused by oblique subduction on a continental margin.

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Regional relative tectonic activity of structures in the Pampean flat slab segment of Argentina from 30 to 32°S

Cited by 17 publications

References 118 publications

Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

Late Quaternary Intraplate Deformation Defined by the Las Chacras Fault Zone, West‐Central Argentina

Slip Distribution and Footwall Topography of the Yanggao‐Tianzhen Fault (Northern Shanxi Graben): Implications for the Along‐Strike Variations in Fault Activity and Regional Deformation

Geomorphic signatures of neotectonic activity along the Western Andean Front in the Chilean Andes (35°S to 37°S)

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