Pliocene environmental change in West Africa and the onset of strong NE trade winds (ODP Sites 659 and 658)

Vallé, Francesca; Dupont, Lydie M; Leroy, Suzanne A.G.; Schefuß, Enno; Wefer, Gerold

doi:10.1016/j.palaeo.2014.09.023

Cited by 26 publications

(26 citation statements)

References 71 publications

(125 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Records of both Fe and Ti show similar patterns at Site 959, albeit Ti area values are substantially smaller. An excellent linear correlation has been found between ln(Ti/Ca) and dust percentages determined from the carbonate free siliciclastic content of sediments of ODP Site 659 (Tiedemann et al 1994;Vallé et al 2014). Thus, we interpret the Ti/Ca ratio in the sediment as an indication of the dust supply (Arz et al 1999) and the Ti/Al ratio as a proxy of aeolian versus fluvial input (Govin et al 2012;Zabel et al 2001).…”

Section: Interpretation Of the Elemental Ratios In The Sedimentmentioning

confidence: 75%

“…d Dust over the tropical East Atlantic from Site 659 (green) after Tiedemann et al (1994) and Site 662 (blue) after , 11 pt moving averages; age model of Site 662 after Lisiecki and Raymo (2005) and (Herbert et al 2010). e Ti/Ca ratios after XRF scanning of Site 959 (violet, this study) and Site 659 (green, Vallé et al 2014), 31 pt moving averages. f, g Ti/Al (f) and Al/Si (g) ratios of Site 959 (violet, this study), 31 pt moving average.…”

Section: Sedimentation During the Messinian Salinity Crisis (Msc)mentioning

confidence: 84%

“…De Schepper et al 2014). From the pollen record of ODP Site 659, it has been concluded that NE trade winds strongly enhanced during short periods around 2.7 and 2.6 Ma and after 2.53 Ma (Leroy and Dupont 1994;Vallé et al 2014) corresponding with increased aeolian input and cold sea surface temperatures at IODP Site U1313 in the North Atlantic (Naafs et al 2012).…”

Section: Long-term Sedimentation Changes After the Mscmentioning

confidence: 98%

See 2 more Smart Citations

Orbital-driven environmental changes recorded at ODP Site 959 (eastern equatorial Atlantic) from the Late Miocene to the Early Pleistocene

Vallé¹,

Westerhold²,

Dupont³

2016

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

the Intertropical Convergence Zone during winter. Between 3.2 and 2.9 Ma, ODP Site 959 Ti/Ca ratios exhibit three maxima corresponding to eccentricity maxima similarly to other dust records of northern Africa. This suggests continent-wide aridity or larger climate variability during that interval. Eccentricity forcing (405 and 100 kyr) and precession frequencies are found in the entire studied interval. The variations of Ti/Al ratio suggest stronger seasonality between 5.8 and 5.5 Ma and after 3.2 Ma.

show abstract

Section: Interpretation Of the Elemental Ratios In The Sedimentmentioning

confidence: 75%

Section: Sedimentation During the Messinian Salinity Crisis (Msc)mentioning

confidence: 84%

Section: Long-term Sedimentation Changes After the Mscmentioning

confidence: 98%

See 1 more Smart Citation

Orbital-driven environmental changes recorded at ODP Site 959 (eastern equatorial Atlantic) from the Late Miocene to the Early Pleistocene

Vallé¹,

Westerhold²,

Dupont³

2016

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Considering the increasing bias toward dry climate phases in the South African early hominin record between 3.2 and 1.3 Ma (Pickering et al, ), we recommend that the impact of dust on tooth wear and chewing efficiency should be considered. Valle, Dupont, Leroy, Schefuß, and Wefer () proposed that based on meridional sea surface temperature differences in the equatorial Pacific (Lawrence, Liu, & Herbert, ) the zonal and meridional atmospheric circulations, including African trade winds, started at 3 Ma (Feodorov et al, ; Wara, Ravelo, & Delaney, ) and intensified around 2 Ma (Marlow, Lange, & Rosell‐Mele, ). We therefore hypothesize that seasonal dust impact from these trade winds might have been an important source for extrinsic dietary abrasives in hominin evolution.…”

Section: Discussionmentioning

confidence: 99%

Dust affects chewing efficiency and tooth wear in forest dwelling Western chimpanzees (Pan troglodytesverus)

Schulz‐Kornas

Stuhlträger

Clauss³

et al. 2019

American J Phys Anthropol

View full text Add to dashboard Cite

Objectives: In humans it has been shown that abrasive particles in the diet result in increased tooth wear and less intense chewing behavior, both of which decrease chewing efficiency. This behavioral response may also exist in non-human primates as a means to reduce the wear effect of dust-laden food. Here we tested whether the periodical occurrence of abrasive dust particles in the diet of Western chimpanzees affects tooth wear and reduces chewing efficiency.Materials and methods: We measured fecal particle size of undigested food matter as an indicator of chewing efficiency in 13 Western chimpanzees of the Taï National Park (Ivory Coast) before (wet), after (wet) and during a dust-rich (dry) period. Moreover, feeding data were compiled for a further 12 chimpanzees and matched to three-dimensional surface texture data measured on two molar facets of 26 skulls of the same population.Results: Fecal particles were larger during the dry period, indicating a reduced chewing efficiency compared to wet periods; age and sex did not have an effect. Concomitantly, dust led to an increase of abrasive wear evidenced by smaller texture features and higher density of fine furrows on wear facets.Discussion: Our findings show that a periodical increase in dust loads on foods places a dietaryphysiological stress on the digestive system in chimpanzees. We suggest that the impact of extrinsic abrasive particles from globally acting periodical dust-laden winds may affect evolutionary fitness. Further studies are required to elucidate this relationship in other non-human primates and fossil hominins. K E Y W O R D S abrasive particles, fecal particle size, mastication, Taï, texture

show abstract

“…These changes have been interpreted as a response to the intensification of the Gulf Stream after the closure of the Isthmus of Panama at 4.6 Ma (Haug and Tiedemann, ), potentially showing larger supply rates of terrigenous‐derived material. This is supported by IODP drillings in the Pacific Ocean on the western margin of Africa at c. 23°S latitude that encountered a higher abundance of wind‐blown dust and sand and a larger abundance of pollen in Pleistocene sediments (Ruddiman et al., ; Vallé et al., ). Despite the potential for biases in sediment accumulation rates, the changing relative abundance of clastic material in offshore archives suggests increasing terrestrial input at or after c. 5 Ma, which is consistent with an inferred increase in the ratio between physical and chemical sedimentation.…”

Section: Sedimentary Archivesmentioning

confidence: 99%

Lack of a weathering signal with increased Cenozoic erosion?

Norton

Schlunegger

2017

Terra Nova

View full text Add to dashboard Cite

The Late Cenozoic has been marked by large and rapid fluctuations in temperature.This cooling has been attributed to accelerated erosion, with concomitant increased chemical-weathering rates and CO 2 drawdown from the atmosphere. At the same time, much of the supporting evidence appears to be affected by a sampling bias, implying that global erosion and weathering have remained largely constant over the past millions of years. We suggest that sedimentary archives of geomorphic activity, such as grain size and the ratio of terrestrial to oceanic sedimentation, which show accelerated erosion are not subject to these biases. Furthermore, the active tectonic settings where these erosion increases were likely to have taken place are exactly those locations where chemical-weathering signals are least likely to faithfully follow physical erosion rates. A lack of evidence for an increase in chemical weathering does not necessarily preclude an increase in physical erosion.In this contribution, we suggest an alternative interpretation in which erosion rates have increased in the Late Cenozoic but without significantly increased silicate weathering, which can explain the meagre response of chemical-weathering proxies. | INTRODUCTIONMany recent papers have highlighted a lack of consensus on our understanding of how, and even if, climate impacts landscape change over geological timescales (e.g. Herman and Champagnac, 2016;Willenbring and Jerolmack, 2016). Over the past few million years, climate cooled significantly (e.g. Lisiecki & Raymo, 2005) such that glaciers began to grow globally. Initially, geological records were interpreted to indicate that sedimentation rates (and by proxy erosion rates) increased at the same time (Hay et al. 1988;Kuhlemann et al., 2002;Zhang et al., 2001;Herman et al., 2013). These datasets seemed to support positive feedbacks between mountain building, climate and erosion (Molnar and England, 1990; Raymo and Ruddiman, 1992 among others). The most accepted version of this argument is that global cooling drove glacial advance, which in turn resulted in increased erosion and weathering rates (e.g. Molnar and England, 1990;Herman et al., 2013;Herman and Champagnac, 2016). These increased weathering rates would then result in CO 2 drawdown through silicate-mineral weathering (e.g. Raymo and Ruddiman, 1992;Berner & Kothaval, 2001). This scenario was consistent with the available data until it was suggested that a measurement bias existed in the geological record (Sadler, 1999;Schumer & Jerolmack, 2009;Sadler & Jerolmack, 2014;Willenbring and Jerolmack, 2016

show abstract

Pliocene environmental change in West Africa and the onset of strong NE trade winds (ODP Sites 659 and 658)

Cited by 26 publications

References 71 publications

Orbital-driven environmental changes recorded at ODP Site 959 (eastern equatorial Atlantic) from the Late Miocene to the Early Pleistocene

Orbital-driven environmental changes recorded at ODP Site 959 (eastern equatorial Atlantic) from the Late Miocene to the Early Pleistocene

Dust affects chewing efficiency and tooth wear in forest dwelling Western chimpanzees (Pan troglodytesverus)

Lack of a weathering signal with increased Cenozoic erosion?

Contact Info

Product

Resources

About