Chronostratigraphy of a 1.5±0.1 Ma composite sedimentary record from Colônia basin (SE Brazil): Bayesian modeling based on paleomagnetic, authigenic 10Be/9Be, radiocarbon and luminescence dating

Simon, Quentin; Ledru, Marie‐Pierre; Sawakuchi, André Oliveira; Favier, Charly; Mineli, Thays Desiree; Grohmann, Carlos Henrique; Guedes, M.A.; Bard, Édouard; Thouveny, Nicolas; Garcia, Marta; Tachikawa, Kazuyo; Rodríguez‐Zorro, Paula A.

doi:10.1016/j.quageo.2020.101081

Cited by 14 publications

(21 citation statements)

References 84 publications

(94 reference statements)

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“…In J o u r n a l P r e -p r o o f 3 addition to reversals, magnetic minerals can record paleomagnetic secular variations and changes in Earth's magnetic field intensity. Full vector analysis of Quaternary oceanic sediment cores enables quasi-continuous reconstruction of the relative variations in the Earth's magnetic field (e.g., Tauxe, 1993;Weeks et al 1993;Stoner and St-Onge, 2007;Channell et al, 2012Channell et al, , 2014Channell et al, , 2019Roberts et al, 2013;Liu et al 2016;Deschamps et al 2018;Simon et al 2020). This reconstruction is based on the assumption that magnetic minerals such as magnetite and titanomagnetite within the sediment reflect the strength and the direction of the Earth magnetic field at the time they were deposited.…”

Section: Introductionmentioning

confidence: 99%

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

Bieber

St‐Onge

Feuillet

et al. 2021

Quaternary Geochronology

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Section: Introductionmentioning

confidence: 99%

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

Bieber

St‐Onge

Feuillet

et al. 2021

Quaternary Geochronology

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“…A 14 m deep sediment core retrieved in 2014 from the Colônia crater, south of the city of São Paulo, recorded the local past vegetation dynamics. Led by collaborator Ledru, the chronostratigraphic analysis of the core revealed that it spans the last 1.5 million years and that the Colônia basin formed between 11.2-5.3 million years ago (Simon et al 2020). Data from the top portion of the core (180,000 years ago [180 ka] until the present) indicated that: 1) a cool mixed evergreen forest was present in the region between 180 and 45 ka, being replaced by rainforest, 2) the temperature around 57-29 ka (penultimate glacial period) was cooler than during the Last Glacial Maximum (23-29 ka), and 3) wet summer season became longer from 95 ka until the present (Rodríguez-Zorro et al 2020).…”

Section: Academicmentioning

confidence: 99%

A multidisciplinary framework for biodiversity prediction in the Brazilian Atlantic Forest hotspot

et al. 2022

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We briefly describe selected results from our thematic project focused on the biodiversity of the Atlantic Forest (“AF BIOTA”), which was jointly funded by FAPESP’s BIOTA Program, the U.S. National Science Foundation Dimensions of Biodiversity Program, and the National Aeronautics and Space Administration (NASA). As one of the five most important hotspots of biodiversity in the world, the Atlantic Forest (AF) holds less than 16% of its vegetation cover, yet, amongst the hotspots, it still harbors one of the highest numbers of species, including endemics. By gathering specialists across multiple disciplines (biology, geology, engineering), we aimed to understand how this megabiodiversity was built through time, informing biodiversity science and conservation. Among the results, we trained 18 Master’s and 26 Ph.D. students, published more than 400 peer-reviewed papers that improved our knowledge about the forest’s biologic and climatic diversity and dynamics through time, developed new analytical methods, produced outreach videos and articles, and provided data to help define biodiversity conservation policies.

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“…Though the radioactive decay of 10 Be has been used to date sediment much older than the Orakei sequence (e.g. Frank et al, 2008;Simon et al, 2020a), no study has been published yet applying 10 Be variations in sediment cores as a relative dating tool by comparison to RPI reference data beyond the Laschamp excursion (Nilsson et al, 2011). Meteoric cosmogenic 10 Be is produced in the atmosphere via nuclear reactions of cosmicray particles with nuclei such as nitrogen and oxygen.…”

Section: Beryllium-10mentioning

confidence: 99%

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

et al. 2020

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Abstract. Northern New Zealand is an important location for understanding Last Glacial Interval (LGI) palaeoclimate dynamics, since it is influenced by both tropical and polar climate systems which have varied in relative strength and timing. Sediments from the Auckland Volcanic Field maar lakes preserve records of such large-scale climatic influences on regional palaeo-environment changes, as well as past volcanic eruptions. The sediment sequence infilling Orakei maar lake is continuous, laminated, and rapidly deposited, and it provides a high-resolution (sedimentation rate above ∼ 1 m kyr−1) archive from which to investigate the dynamic nature of the northern New Zealand climate system over the LGI. Here we present the chronological framework for the Orakei maar sediment sequence. Our chronology was developed using Bayesian age modelling of combined radiocarbon ages, tephrochronology of known-age rhyolitic tephra marker layers, 40Ar∕39Ar-dated eruption age of a local basaltic volcano, luminescence dating (using post-infrared–infrared stimulated luminescence, or pIR-IRSL), and the timing of the Laschamp palaeomagnetic excursion. We have integrated our absolute chronology with tuning of the relative palaeo-intensity record of the Earth's magnetic field to a global reference curve (PISO-1500). The maar-forming phreatomagmatic eruption of the Orakei maar is now dated to > 132 305 years (95 % confidence range: 131 430 to 133 180 years). Our new chronology facilitates high-resolution palaeo-environmental reconstruction for northern New Zealand spanning the last ca. 130 000 years for the first time as most NZ records that span all or parts of the LGI are fragmentary, low-resolution, and poorly dated. Providing this chronological framework for LGI climate events inferred from the Orakei sequence is of paramount importance in the context of identification of leads and lags in different components of the Southern Hemisphere climate system as well as identification of Northern Hemisphere climate signals.

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Chronostratigraphy of a 1.5±0.1 Ma composite sedimentary record from Colônia basin (SE Brazil): Bayesian modeling based on paleomagnetic, authigenic 10Be/9Be, radiocarbon and luminescence dating

Cited by 14 publications

References 84 publications

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

Regional chronostratigraphy in the eastern Lesser Antilles quaternary fore-arc and accretionary wedge sediments: Relative paleointensity, oxygen isotopes and reversals

A multidisciplinary framework for biodiversity prediction in the Brazilian Atlantic Forest hotspot

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

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