Pleistocene uplift, climate and morphological segmentation of the Northern Chile coasts (24°S–32°S): Insights from cosmogenic 10Be dating of paleoshorelines

Martinod, Joseph; Regard, Vincent; Riquelme, Rodrigo; Aguilar, Germán; Guillaume, Benjamin; Carretier, Sébastien; Cortés‐Aranda, Joaquín; Léanni, Laëtitia; Hérail, Gérard

doi:10.1016/j.geomorph.2016.09.010

Cited by 26 publications

(33 citation statements)

References 40 publications

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“…Working with slope requires very precise DEM, and could be falsified by colluvial sediments mantling the terraces as in South Taranaki (PILLANS 1983). Also, the effect of the initial slope before shore platform carving deserves further exploration (e.g., MARTINOD et al 2016).…”

Section: Resultsmentioning

confidence: 99%

Geometrical trends within sequences of Pleistocene marine terraces: selected examples from California, Peru, Chile and New-Zealand

Regard¹,

Pedoja²,

Torre³

et al. 2017

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Elevations of the shoreline angles of marine terraces have long been used to infer Pleistocene sea levels and/or uplift rates. We attempt to use morphologic properties of sequences of marine terraces -terrace width and slope-in order to track if these constitute a pattern showing similar alternations at different sites and if this alternation is comparable to the signal from the sea level highstand succession -duration and sea level-for Middle-Late Pleistocene. To do so, we focus on sequences of marine terrace including more than 10 successive strandlines from San Clemente Island and Santa Cruz (both in California, USA). We generated and analyzed 30 topographic profiles in order to confirm the occurrence or lack of each terrace, and to characterize their width and slope. To complement the observation of tenuous trends, we used additional data from previous works at Point Reyes (California, USA), Altos de Talinay (central Chile), San Juan de Marcona (central Peru) and South Taranaki (Northern Island, New Zealand). These additional data strengthen the observations made at San Clemente and Santa Cruz and prove that the most prominent terrace observed is usually carved during the Marine Isotopic Stage 5 (MIS5). Moreover, some terraces appear better expressed than the others: those formed during MIS7, MIS9 plus one of those formed during MIS15, MIS17 or MIS19 highstands. The terraces formed during MIS11 are not preeminent, contrary to what expected from its long highstand duration.

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Section: Resultsmentioning

confidence: 99%

Geometrical trends within sequences of Pleistocene marine terraces: selected examples from California, Peru, Chile and New-Zealand

Regard¹,

Pedoja²,

Torre³

et al. 2017

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“…Along the WSC, staircase-like sequences of multiple marine terraces are preserved nearly continuously along the coast. They comprise primarily wave-cut surfaces that are frequently covered by beach ridges of siliciclastic sediments and local accumulations of carbonate bioclastic materials along the beach ridges (Ota et al, 1995;Saillard et al, 2009;Rodríguez et al, 2013;Martinod et al, 2016b). Rasa surfaces exist in the regions of southern Peru and northern Chile (Regard et al, 2010;Rodríguez et al, 2013;Melnick, 2016).…”

Section: Marine Terraces and Coastal Uplift Ratesmentioning

confidence: 99%

“…In central and northern (Fuenzalida et al, 1965). Specifically, between 24°S and 32°S, paleo-shoreline elevations of the last interglacial (MIS-5e) range between 25 and 45 m (Ota et al, 1995;Saillard et al, 2009;Martinod et al, 2016b). Shore platforms are higher in the Altos de Talinay area (30.3°-31.3°S) but are small, poorly preserved, and terminate at a high coastal scarp between 26.75°S and 24°S (Martinod et al, 2016b).…”

Section: Marine Terraces and Coastal Uplift Ratesmentioning

confidence: 99%

“…Specifically, between 24°S and 32°S, paleo-shoreline elevations of the last interglacial (MIS-5e) range between 25 and 45 m (Ota et al, 1995;Saillard et al, 2009;Martinod et al, 2016b). Shore platforms are higher in the Altos de Talinay area (30.3°-31.3°S) but are small, poorly preserved, and terminate at a high coastal scarp between 26.75°S and 24°S (Martinod et al, 2016b). Shorelineangle elevations within the Maule segment (34°-38°S) vary from high altitudes in the Arauco and Topocalma areas (200 m) to moderate elevations near Caranza (110 m) and very low elevations in between (15 m) (Melnick et al, 2009;Jara-Muñoz et al, 2015).…”

Section: Marine Terraces and Coastal Uplift Ratesmentioning

confidence: 99%

“…These movements ceased after the highstand during the MIS-5e and slow uplift rates of around 0.16 m/ka characterized the region since 100 ka (Ortlieb et al, 1996). In northern Chile (24°-32°S), uplift rates for the Late Pleistocene average around 0.28 ± 0.15 m/ka (Martinod et al, 2016b), except for the Altos de Talinay area, where pulses of rapid uplift occurred during the Middle Pleistocene (Ota et al, 1995;Saillard et al, 2009;Martinod et al, 2016b). The Central Andean rasa (15°-33°S) and the oldest Pleistocene shore platformswhich are also generally widerindicate accelerated and spatially continuous uplift after a period of tectonic stability or subsidence.…”

Section: Marine Terraces and Coastal Uplift Ratesmentioning

confidence: 99%

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Marine terraces of the last interglacial period along the Pacific coast of South America (1° N–40° S)

Freisleben¹,

Jara‐Muñoz²,

Melnick³

et al. 2020

Preprint

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Abstract. Tectonically active coasts are dynamic environments characterized by the presence of multiple marine terraces formed by the combined effects of wave-erosion, tectonic uplift, and sea-level oscillations at glacial-cycle timescales. Well-preserved erosional terraces from the last interglacial sea-level highstand are ideal marker horizons for reconstructing past sea-level positions and calculating vertical displacement rates. We carried out an almost continuous mapping of the last interglacial marine terrace along ~5,000 km of the western coast of South America between 1° N and 40° S. We used quantitatively replicable approaches constrained by published terrace-age estimates to ultimately compare elevations and patterns of uplifted terraces with tectonic and climatic parameters in order to evaluate the controlling mechanisms for the formation and preservation of marine terraces, and crustal deformation. Uncertainties were estimated on the basis of measurement errors and the distance from referencing points. Overall, our results indicate a median elevation of 30.1 m, which would imply a median uplift rate of 0.22 m/ka averaged over the past ~125 ka. The patterns of terrace elevation and uplift rate display high-amplitude (~100–200 m) and long-wavelength (~102 km) structures at the Manta Peninsula (Ecuador), the San Juan de Marcona area (central Peru), and the Arauco Peninsula (south-central Chile). Medium-wavelength structures occur at the Mejillones Peninsula and Topocalma in Chile, while short-wavelength (

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Mineral species and formation processes: Raman spectroscopic and microscopic analysis of stains from a late pleistocene continental drowned faunal bone assemblage, Central Chile

et al. 2021

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In this study we address the analysis of bone staining and its sedimentary deposits to obtain a better understanding of the taphonomic trajectories of faunal assemblages in dynamic site formation processes. The fossil remains belong to continental fauna recovered at GNL Quintero 1, a Late Pleistocene drowned terrestrial site located nearshore at Quintero bay in the central coast of Chile (32°S). By conducting Raman spectroscopic and microscopic analyses we aim to identify the mineral compounds of bone staining and their sedimentary matrix, perform a first geochemical characterization of the depositional environments and carry out paleoenvironmental inferences. Stains are present on most remains and recur in a variety of colors, indicating the presence of minerals, such as hematite, goethite, pyrolusite, pyrite or marcasite, mackinawite, and greigite.Mineral species identified are associated with oxic and anoxic environments, suggesting that the bones and sediments underwent both sulfuricization and sulfidization processes. Spectroscopic data obtained suggest that the trajectory of the remains was much more dynamic than previously assumed. These geochemical scenarios of alternating oxidation and reduction reflects the diverse environments involved during the terrestrial phase, the transitional phase of rising sea level, and subsequently the marine phase.

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Pleistocene uplift, climate and morphological segmentation of the Northern Chile coasts (24°S–32°S): Insights from cosmogenic 10Be dating of paleoshorelines

Abstract: Pleistocene uplift, climate and morphological segmentation of the Northern Chile coasts (24°S-32°S): insights from cosmogenic 10 Be dating of paleoshorelines.

Cited by 26 publications

References 40 publications

Geometrical trends within sequences of Pleistocene marine terraces: selected examples from California, Peru, Chile and New-Zealand

Geometrical trends within sequences of Pleistocene marine terraces: selected examples from California, Peru, Chile and New-Zealand

Marine terraces of the last interglacial period along the Pacific coast of South America (1° N–40° S)

Mineral species and formation processes: Raman spectroscopic and microscopic analysis of stains from a late pleistocene continental drowned faunal bone assemblage, Central Chile

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