Peruvian sediments as recorders of an evolving hiatus for the last 22 thousand years

Erdem, Zeynep; Schönfeld, Joachim; Glock, Nicolaas; Dengler, Marcus; Mosch, Thomas; Sommer, Stefan; Elger, Judith; Eisenhauer, Anton

doi:10.1016/j.quascirev.2016.01.029

Cited by 24 publications

(22 citation statements)

References 83 publications

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“…Core 029 from 9°S at 400 m water depth is located within an area where at present only small amounts of sediment are deposited due to high‐energy hydrographic conditions, such as peak velocities of the PCUC (for details see Erdem et al . []). Hence, both the modern and Holocene SRs (11–20 cm ka −1 ) and ARs (mean AR bSi value = 1.1 g cm −2 ka −1 ) were relatively low (Figure f).…”

Section: Resultsmentioning

confidence: 99%

“…The age model of core 052 [ Erdem et al ., ] is based on five Accelerator Mass Spectrometer (AMS) 14 C datings of the planktonic foraminifera species Neogloboquadrina dutertrei in combination with orbital tuning of δ 18 O values of nearby core M77/2‐059 [ Mollier‐Vogel et al ., ] and supported by correlation to the δ 18 O of the EPICA ice core [ European Project for Ice Coring in Antarctica Community Members , 2006]. The conventional radiocarbon dates were calibrated using the software Calib 7.0 and applying the marine calibration set Marine13 [ Reimer and Bard , ].…”

Section: Methodsmentioning

confidence: 99%

“…Although effects of erosion and reworking are often excluded because of the presence of finely laminated sediment intervals, modern sediments between 5°S and 10°S as well as sediment cores covering T1 and the Holocene reveal large discontinuities in the sediment record [ Skillbeck and Fink , ; Erdem et al ., ]. These discontinuities in the sedimentary record have been attributed to the erosion by strong bottom currents (velocity of the PCUC) [e.g., Reimers and Suess , ; Reinhardt et al ., ; Skillbeck and Fink , ], earthquakes [ Salvatteci et al ., ], and/or nonlinear internal waves (NLIWs) [see Erdem et al ., ] causing sediment erosion and sediment redistribution or bioturbation caused by periodic bottom water oxygenation [ Levin , ]. Nonetheless, recent reconstructions applying stacked sediment approaches have shown to produce reliable records focusing on laminated sediment sections [ Salvatteci et al ., ].…”

Section: Regional Settingmentioning

confidence: 99%

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Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing

et al. 2016

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New records of stable silicon isotope signatures (δ30Si) together with concentrations of biogenic opal and organic carbon from the central (9°S) and northern (5°S) Peruvian margin reveal changes in diatom productivity and nutrient utilization during the past 20,000 years. The findings are based on a new approach using the difference between the δ30Si signatures of small (11–32 µm) and large (>150 µm) diatom fractions (Δ30SiCoscino‐bSi) in combination with the variance in diatom assemblages for reconstruction of past upwelling intensity. Combination of our records with two previously published records from the southern upwelling area off Peru (12–15°S) shows a general decoupling of the environmental conditions at the central and southern shelf mainly caused by a northward shift of the main upwelling cell from its modern position (12–15°S) toward 9°S during Termination 1. At this time only moderate upwelling intensity and productivity levels prevailed between 9°S and 12°S interpreted by a more northerly position of Southern Westerly Winds and the South Pacific Subtropical High. Furthermore, a marked decrease in productivity at 12–15°S during Heinrich Stadial 1 coincided with enhanced biogenic opal production in the Eastern Equatorial Pacific, which was induced by a southward shift of the Intertropical Convergence Zone and enhanced northeasterly trade winds. Modern conditions were only established at the onset of the Holocene. Past changes in preformed δ30Si signatures of subsurface waters reaching the Peruvian Upwelling System did not significantly affect the preserved δ30Si signatures.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Regional Settingmentioning

confidence: 99%

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Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing

et al. 2016

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“…The age model of the core M77/2-59-1 (3°57'S 997 m) was established by (Mollier-Vogel et al, 2013). Age models of the other cores were previously described elsewhere (Erdem et al, 2016). Sedimentary δ 15 N data of core 52-2 and 59-1 were taken from Glock et al (2018) and Mollier-Vogel et al (2019), respectively (Table 3).…”

Section: Sediment Coresmentioning

confidence: 99%

Bottom-water deoxygenation at the Peruvian Margin during the last deglaciation recorded by benthic foraminifera

Erdem¹,

Schönfeld²,

Rathburn³

et al. 2019

Preprint

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Abstract. Deciphering the dynamics of dissolved oxygen in the mid-depth ocean during the last deglaciation is essential to understand the influence of climate change on modern oxygen minimum zones (OMZs). Many paleo-proxy records from the Eastern Pacific Ocean indicate an extension of oxygen depleted conditions during the deglaciation but the degree of deoxygenation has not been quantified to date. The Peruvian OMZ, one of the largest OMZs in the world, is a key area to monitor such changes in near-bottom water oxygenation in relation to changing climatic conditions. Here, we analysed the potential to use the composition of foraminiferal assemblages from the Peruvian OMZ as a quantitative redox-proxy. A multiple regression analysis was applied to a joint dataset of living (rose Bengal stained, fossilizable calcareous species) benthic foraminiferal distributions from the Peruvian continental margin. Bottom-water oxygen concentrations ([O2]BW) during sampling were used as dependant variable. The correlation was significant (R2 = 0.82; p

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“…The two most important are waves sourced by the strong westerly winds in the Southern Ocean (Beccario, http://earth.nullschool.net) [ López et al ., ] and along‐margin oceanic currents such as the Peru‐Chile (Humboldt) Currents [ Chaigneau et al ., ] (Figure ). Sediment archives at the seafloor from 3°S to 18°S are characteristic of current‐dominated regimes [ Reinhardt et al ., ] with ongoing phosphorite formation, tide‐topography interaction, and resultant nonlinear internal waves [ Erdem et al ., ]. Mooring experiments documented current speeds of up to 20 cm/s in the upper 200 m of the continental shelf of Peru from 5°S to 15°30′S [ Brockmann et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Fore‐arc seafloor unconformities and geology: Insight from 3‐D seismic geomorphology analysis, Peru

Calvès

Auguy

Lavaissière

et al. 2017

Geochem Geophys Geosyst

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New 3‐D seismic data collected over 4870 km2 in the 3°45′S–12°30′S Peruvian segment of the East Pacific subduction system image seafloor erosional surfaces that can be mapped across the fore‐arc basins. Fore‐arc basins experience various stresses, from their base where basal tectonic erosion acts to the seafloor which is influenced by aerial, shallow, and deep water currents driven by waves or thermohaline oceanic currents. Previously there has been little interest in stresses on the upper layer and there is a lack of documentation of unconformities and the erosive processes in certain bathymetric domains in fore‐arc basins. We address this with the study of examples sourced from 3‐D seismic reflection surveys of the seafloor offshore Peru. Unconformities occur in two distinctive bathymetric domains associated with the continental shelf and the upper slope of the margin. Identification and characterization of unconformity surfaces yield estimates of the amount of erosion at the modern seafloor that range from 18 to 100%. Regional physical oceanography allows us to calibrate potential candidates for these two distinctive domains. The first control on erosion is the dynamics of deep to intermediate oceanic currents related to the Humboldt‐Peru Chile water masses, while the second is wave action in the shallower erosional surfaces. This study illustrates the unseen landscape of the fore‐arc basins of South America and helps to highlight the importance of erosive surficial processes in subduction landscapes.

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Peruvian sediments as recorders of an evolving hiatus for the last 22 thousand years

Cited by 24 publications

References 83 publications

Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing

Changes in diatom productivity and upwelling intensity off Peru since the Last Glacial Maximum: Response to basin-scale atmospheric and oceanic forcing

Bottom-water deoxygenation at the Peruvian Margin during the last deglaciation recorded by benthic foraminifera

Fore‐arc seafloor unconformities and geology: Insight from 3‐D seismic geomorphology analysis, Peru

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