Influence of the Amazon River development and constriction of the Central American Seaway on Middle/Late Miocene oceanic conditions at the Ceara Rise

Heinrich, Sonja; Zonneveld, Karin A F

doi:10.1016/j.palaeo.2013.06.026

Cited by 12 publications

(18 citation statements)

References 44 publications

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“…Heinrich and Zonneveld (2013) found indications for pulses of North Atlantic deep water (NADW) reaching the Ceará Rise from 12.4 Ma onwards, coinciding with the increase in Al/Si in the Ceará Rise sediments. Shoaling, and eventually closing of the Panama Isthmus, caused a reversion of the Brazil current, which flows parallel to the Brazilian coastline (e.g., Heinrich and Zonneveld, 2013). As this likely affected the direction of the out-flow of the Amazon River, it is possible that lower accumulation rates in the mid-Miocene are a consequence of a (temporary) redirection of sediments toward another deposition area.…”

Section: Sedimentation On the Ceará Risementioning

confidence: 92%

“…The Al/Si ratio can be considered to represent grain size, as Al is dominant in the clay fraction and Si is the main constituent of quartz, which is the principal mineral in the sand fraction (Bouchez et al, 2011;Roddaz et al, 2014). Heinrich and Zonneveld (2013) found indications for pulses of North Atlantic deep water (NADW) reaching the Ceará Rise from 12.4 Ma onwards, coinciding with the increase in Al/Si in the Ceará Rise sediments. Shoaling, and eventually closing of the Panama Isthmus, caused a reversion of the Brazil current, which flows parallel to the Brazilian coastline (e.g., Heinrich and Zonneveld, 2013).…”

Section: Sedimentation On the Ceará Risementioning

confidence: 99%

“…2A and 2D). Around 12.4 Ma, the Central American Seaway, which allowed NADW to flow toward the Pacific, was sufficiently closed to force NADW into the South Atlantic Ocean, which consequently also changed the flow direction of the Brazil Current from SE to NW (Heinrich and Zonneveld, 2013;Nisancioglu et al, 2003) (see Fig. 6).…”

Section: Organic Matter Sources and Biomarker Signalsmentioning

confidence: 99%

“…The resulting increase in erosion and sediment transport from the Andes toward the east resulted in a substantial increase in sediment deposition near the Amazon mouth since either 11.8-10.5 Ma (Figueiredo et al, 2010(Figueiredo et al, , 2009 or 9.5-8.3 Ma (Gorini et al, 2014). The expanding river system also noticeably affected sedimentation on the Ceará Rise, an oceanic ridge east of the Amazon River mouth (e.g., Dobson et al, 2001;Heinrich and Zonneveld, 2013). In a recent study, Stewart et al (2016) showed that runoff from the Amazon River influenced sedimentation on the Ceará Rise during the Oligocene-Miocene transition.…”

Section: Introductionmentioning

confidence: 99%

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A 30 Ma history of the Amazon River inferred from terrigenous sediments and organic matter on the Ceará Rise

Soelen

Kim

Santos

et al. 2017

Earth and Planetary Science Letters

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The history of the Amazon River is a much-discussed subject, and the timing of the development of a transcontinental system in particular is a matter of some controversy, with estimations varying between the Early Miocene and the Pliocene or even the Pleistocene. To shed further light on this, we studied the sediment provenance of an Oligocene to Late Pleistocene marine sedimentary section from the Ceará Rise (ODP Site 925), a topographic high in the central Atlantic Ocean, using major element concentrations and Nd isotopic composition in 85 samples. In addition, the carbon isotopic composition of bulk organic matter and changes in the distribution of glycerol dialkyl glycerol tetraethers (GDGTs) were used to identify periods of increased river outflow. On the basis of these results, we suggest that the history of the development of the Amazon River is characterized by specific steps. During the late Oligocene/Early Miocene (30-18.3 Ma), the terrigenous mass accumulation rates (TARs) were high, and sediment and GDGT compositions suggest that a large river system existed, which at times received weathering products from a younger and probably Andean sediment source. A shift to a younger Andean sediment provenance after 8.7 Ma indicates that the Amazon River became permanently connected with the Andes. Between 18.3 and 4.5 Ma, TARs were generally low, and GDGTs were derived for the most part from in situ production in marine waters. Around 4.5 Ma, the river expanded, probably due to ongoing tectonic activity, and uplift in the Andes increased Andean rock erosion. This led to a strong increase in terrigenous sediment deposition and enhanced organic matter preservation on the Ceará Rise, and the delivery of terrestrial (both soil and riverine) branched GDGTs to the Ceará Rise.

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Section: Sedimentation On the Ceará Risementioning

confidence: 92%

Section: Sedimentation On the Ceará Risementioning

confidence: 99%

Section: Organic Matter Sources and Biomarker Signalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A 30 Ma history of the Amazon River inferred from terrigenous sediments and organic matter on the Ceará Rise

Soelen

Kim

Santos

et al. 2017

Earth and Planetary Science Letters

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“…The Purus Arch acts as a topographic divide in the Miocene controlling the sedimentation of Solimões Formation and some rivers flow eastwards (Milani and Zalan, 1999). The period when Amazonas River established its current course and onset the Amazonas Fan is still debated but would have occurred at most during Miocene at~11 Ma (Figueiredo et al, 2009;Figueiredo et al, 2007;Heinrich and Zonneveld, 2013;Horbe et al, 2013). An extensive area of central Amazonia is covered by the Içá Formation (9.5-2.5 Ma), which occurs around 100-140 m a.s.l.…”

Section: Geologymentioning

confidence: 99%

Combined dating of goethites and kaolinites from ferruginous duricrusts. Deciphering the Late Neogene erosion history of Central Amazonia

et al. 2018

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This study focuses on the dating of millimetric pisoliths from ferruginous duricrusts located in central Amazonia (Brazil), by coupling detailed mineralogy and two relevant dating methods: (i) (U-Th)/He analysis of goethites by mass spectrometry; (ii) analysis of radiation-induced defects of kaolinites embedded in duricrusts by electron paramagnetic resonance spectroscopy (EPR). Three samples collected at different elevations in the landscape were selected. The goethite corrected ages range from 1.1-15.2 Ma and consistently increase with elevation. EPR was performed on kaolinites after several cycles of a deferration procedure. Considering extreme geochemical scenarii, the ages of kaolinites are 1.7-7.1 Ma for a closed system and 4.0-16.7 Ma for an open system with 100% Rn loss. Ages of goethites and kaolinites are close, in the limit of the uncertainty of the methods. They show important periods of duricrust formation at Middle Miocene and at Late Miocene/Pliocene. Data allow the estimation of lowering rates between 3 and 8 m/Ma, in agreement with independent data available in the literature for the central Amazonia region or even for erosion of other cratons in the world. The two dating methods can be compared on common duricrust samples. By revealing single or multi-step weathering/erosion episodes related to relictual paleosurfaces, they also bring promising contributions to an advanced knowledge of ancient and complex lateritic geosystems.

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The Amazon at sea: Onset and stages of the Amazon River from a marine record, with special reference to Neogene plant turnover in the drainage basin

Hoorn

Bogota-A.

Romero-Báez

et al. 2017

Global and Planetary Change

203

170

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Influence of the Amazon River development and constriction of the Central American Seaway on Middle/Late Miocene oceanic conditions at the Ceara Rise

Cited by 12 publications

References 44 publications

A 30 Ma history of the Amazon River inferred from terrigenous sediments and organic matter on the Ceará Rise

A 30 Ma history of the Amazon River inferred from terrigenous sediments and organic matter on the Ceará Rise

Combined dating of goethites and kaolinites from ferruginous duricrusts. Deciphering the Late Neogene erosion history of Central Amazonia

The Amazon at sea: Onset and stages of the Amazon River from a marine record, with special reference to Neogene plant turnover in the drainage basin

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