Provenance of quaternary and modern alluvial deposits of the Amazonian floodplain (Brazil) inferred from major and trace elements and Pb–Nd–Sr isotopes

Horbe, Adriana Maria Coimbra; Trindade, Ivaldo Rodrigues da; Dantas, Elton Luiz; Santos, Roberto Ventura; Roddaz, Martín

doi:10.1016/j.palaeo.2014.06.019

Cited by 17 publications

(8 citation statements)

References 58 publications

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“…εNd values from Zhang et al (2015) and 87 Sr/ 86 Sr isotopic data clearly fall within the isotopic values of the Solimões basin (Viers et al, 2008;Bouchez et al, 2011;Horbe et al, 2014), with a 87 Sr/ 86 Sr range of values of 0.710−0.725 and a εNd main range value of -8−-12.5. Thus, we suggest that the samples analysed here come from this sub-region.…”

Section: Characterization Of the Sub-regionsupporting

confidence: 67%

“…In order to disentangle from which of the two basins our samples are most likely to be originally eroded, we will compare the isotopic signatures of our data with previously reported studies (i.e. Viers et al, 2008;Bouchez et al, 2011;Horbe et al, 2014) (see Fig. 4).…”

Section: Characterization Of the Sub-regionmentioning

confidence: 99%

“…This study also discusses the strong coherence between the registered millennial events and the atmospheric settings of the region, which indicate humid land conditions for the Heinrich Stadials 1 and 2 compared to the Last Glacial Maximum, and during the Last Glacial Maximum compared to the early Holocene.Keywords: Neodymium (Nd), paleoclimate, sedimentary basin, source, Strontium (Sr). Horbe et al, 2014). De esta comparación se deduce que las muestras proceden de la cuenca del río Solimões (Figura 4).La correlación de estos resultados con el paleoclima continental de la zona Norte de Sudamérica es posible mediante su comparación con testigos marinos recuperados en la costa NE del Brasil (Jaeschke et al, 2007;Zhang et al, 2015), testigos de lagos glaciares de los Andes (Baker et al, 2001a, b) y espeleotemas de cuevas situadas en el Amazonas occidental (Wang et al, 2004;Kanner et al, 2012;Mosblech et al, 2012; Cheng et al, 2013) (ver Figura 5).El ciclo hidrológico de la cuenca del Amazonas está estrechamente relacionado con el Monzón Sudamericano (SAM), con un patrón de lluvias acoplado a los períodos de insolación del verano austral (Baker y Fritz, 2015).…”

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“…Keywords: Neodymium (Nd), paleoclimate, sedimentary basin, source, Strontium (Sr). Horbe et al, 2014). De esta comparación se deduce que las muestras proceden de la cuenca del río Solimões (Figura 4).…”

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Neodymium and Strontium isotopes as source indicators for terrigenous sediments deposited in NE Brazil

Ruiz¹,

Pena²

2018

Bol. geol. min.

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This study investigates the sedimentary origin of materials deposited by the Amazon River over the last 30 kyr BP and reconstructs the precipitation pattern of the source area at the time of the erosion. For this purpose, fifteen samples of a down-core sediment record from the French Guiana margin have been used to analyse neodymium (Nd) and strontium (Sr) isotope ratios. The sample results (Sr: 0.71385±0.00166; εNd: -11.67±0.55) suggest that the western Amazon basin catchment area is the main source of the terrigenous material, and point to the Solimões river basin as the most probable origin. This study also discusses the strong coherence between the registered millennial events and the atmospheric settings of the region, which indicate humid land conditions for the Heinrich Stadials 1 and 2 compared to the Last Glacial Maximum, and during the Last Glacial Maximum compared to the early Holocene.Keywords: Neodymium (Nd), paleoclimate, sedimentary basin, source, Strontium (Sr). Horbe et al., 2014). De esta comparación se deduce que las muestras proceden de la cuenca del río Solimões (Figura 4).La correlación de estos resultados con el paleoclima continental de la zona Norte de Sudamérica es posible mediante su comparación con testigos marinos recuperados en la costa NE del Brasil (Jaeschke et al., 2007;Zhang et al., 2015), testigos de lagos glaciares de los Andes (Baker et al., 2001a, b) y espeleotemas de cuevas situadas en el Amazonas occidental (Wang et al., 2004;Kanner et al., 2012;Mosblech et al., 2012; Cheng et al., 2013) (ver Figura 5).El ciclo hidrológico de la cuenca del Amazonas está estrechamente relacionado con el Monzón Sudamericano (SAM), con un patrón de lluvias acoplado a los períodos de insolación del verano austral (Baker y Fritz, 2015). Los datos de Sr aquí presentados se encuentran en sintonía con las características hidrográficas de la zona, mostrando valores altos y constantes de 87 Sr/ 86 Sr para el Último Máximo Glacial (LGM) y para el Holoceno medio-tardío, que se atribuyen a una mayor erosión terrestre como consecuencia de un SAM más intenso, en donde la humedad atlántica tropical se recicla sobre la cuenca Amazónica. Así mismo, la relación 87 Sr/ 86 Sr registra una fuerte caída (una diferencia de 0.033 de en el período 6-5.3 kry BP) coincidiendo con el inicio de la fase de baja insolación del verano austral.Los distintos estudios mencionados anteriormente registran anomalías positivas de precipitación durante los Eventos Heinrich (HS) para casi toda la cuenca del Amazonas. Durante estos episodios abruptos, el gradiente de temperatura latitudinal del Atlántico se incrementa, resultando en un fortalecimiento de los vientos alisios del NE que desplazan la Zona de Convergencia Intertropical (ITCZ) hacia el sur y aportan mayor cantidad de humedad al SAM. Las consecuencias sobre el terreno de estos hechos, son el aumento de la precipitación, la erosión física y el transporte fluvial. Una vez más, nuestros resultados de Sr apuntan en la misma dirección para los eventos HS-1 y HS-2, indicando...

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Section: Characterization Of the Sub-regionsupporting

confidence: 67%

Section: Characterization Of the Sub-regionmentioning

confidence: 99%

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Neodymium and Strontium isotopes as source indicators for terrigenous sediments deposited in NE Brazil

Ruiz¹,

Pena²

2018

Bol. geol. min.

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“…Neo-tectonic reactivations occurred during this period along the Negro and Amazon Rivers [172][173][174]. Also, studies of Neogene sediments from the Ecuadorian [175] and Amazon [176] Basins, together with the fourfold increase of sedimentation rates in the Amazon Fan 2.4 MYA [126], also indicate that important and complex changes in the Amazon Basin drainage occurred during the Pleistocene. Rossetti et al, [135] estimated a maximum age of 43,000 YA for the Quaternary terrace deposits along the Amazon River.…”

Section: Miocene and Pliocene Amazon Biodiversity Hypotheses For The mentioning

confidence: 99%

Continuous Miocene, Pliocene and Pleistocene Influences on Mitochondrial Diversification of the Capybara (Hydrochoerus Hydrochoeris; Hydrochoeridae, Rodentia): Incapacity to Determine Exclusive Hypotheses on the Origins of the Amazon and Orinoco Diversity for This Species

Ruiz‐García¹,

Luengas-Villamil²,

Pinedo-Castro³

et al. 2016

J Phylogenetics Evol Biol

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The capybara (Hydrochoerus hydrochoeris) is the largest rodent on the world and it is strongly linked to the river systems of a large fraction of South America and part of Central America (Panama). Thus, it is an interesting species to test hypotheses about the origin of the high biodiversity within the Amazon Basin and in a sizeable fraction of the Neotropics. To test these hypotheses, we sequenced two mitochondrial genes (control region and Cytochrome b) of 78 wild capybaras sampled in Colombia, Peru, Ecuador and Brazil. At least, five different "populations" or ESUs were detected in well delimited geographical areas. However, our results do not support the more recent view that two different species of capybara are present (H. hydrochoeris and H. isthmus), unless chromosomal speciation (stasipatric or parapatric) can be demonstrated between these two groups. A Bayesian tree with the aforementioned two mitochondrial genes, and another Bayesian tree with a subset of 25 capybaras for 10 mitochondrial genes, showed that the initial diversification of the mitochondrial haplotype in capybaras was initiated in the Late Miocene. The trees also showed that the other haplotype diversification processes extended into the Pliocene and Pleistocene. We also detected population expansion events during different moments of the Pleistocene. Although some authors strongly suggest that the Miocene diversification explains the extreme biodiversity in the Amazon Basin and in surroundings areas (for instance, the Paleogeography hypothesis), others consider it the result of available forest refugia (Refuge hypothesis) during the Pleistocene. However, our results suggest that both hypotheses (and others, such as the Riverrefuge, the Recent Lagoon and the Hydrogeological Recent Change hypotheses) could have affected the evolution of the capybara to generate the current mitochondrial diversity. Thus, it is difficult to generalize a unique Amazon biota diversification hypothesis because each species or taxon could be affected by different processes and because the temporal antiquity of each taxon in South America is also different. Many mammalian taxa, and others, migrated into South America during the Great American Biotic Interchange (GABI) and their diversification processes in South America were mainly driven by Pleistocene events as those proposed by the Refuge hypothesis. Older taxa within this continent could have begun their current genetics diversification processes earlier, such as in the case of the capybara.

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Origin of increased terrigenous supply to the NE South American continental margin during Heinrich Stadial 1 and the Younger Dryas

Zhang

Chiessi

Mulitza

et al. 2015

Earth and Planetary Science Letters

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Provenance of quaternary and modern alluvial deposits of the Amazonian floodplain (Brazil) inferred from major and trace elements and Pb–Nd–Sr isotopes

Cited by 17 publications

References 58 publications

Neodymium and Strontium isotopes as source indicators for terrigenous sediments deposited in NE Brazil

Neodymium and Strontium isotopes as source indicators for terrigenous sediments deposited in NE Brazil

Continuous Miocene, Pliocene and Pleistocene Influences on Mitochondrial Diversification of the Capybara (Hydrochoerus Hydrochoeris; Hydrochoeridae, Rodentia): Incapacity to Determine Exclusive Hypotheses on the Origins of the Amazon and Orinoco Diversity for This Species

Origin of increased terrigenous supply to the NE South American continental margin during Heinrich Stadial 1 and the Younger Dryas

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