The last 50,000 years in the Neotropics (Southern Brazil): evolution of vegetation and climate

Ledru, Marie‐Pierre; Braga, Pedro Ivo Soares; Soubiès, François; Fournier, Marc; Martin, Louis; Suguío, Kenitiro; Turcq, Bruno

doi:10.1016/0031-0182(96)00105-8

Cited by 242 publications

(212 citation statements)

References 15 publications

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“…The error for this number is hard to determine, but most likely larger than 10%. In addition, the time span of enhanced mass movements in the basin is not known but most likely was between 7000 yr (i.e., the time of existence of the lake) and 15,000 yr (the duration of the Minchin period; van der Hammen and Absy 1994; Wirrmann and Mourguiart 1995;Ledru et al 1996;Godfrey et al 1997;Turcq et al 1997). In NW Argentina, the onset of the Minchin wet period may have started later and prevailed for a shorter time span, because this region is located at the southern extremity of the spatial influence of this extreme climatic event.…”

Section: Discussionmentioning

confidence: 99%

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Late Pleistocene Climate Change and Erosion in the Santa Maria Basin, NW Argentina

Trauth¹,

Bookhagen²,

Müller³

et al. 2003

Journal of Sedimentary Research

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Present erosion and sediment flux in the semiarid intramontane Santa Maria Basin, NW Argentina, are compared with conditions during a period of wetter and more variable climate at about 30,000 14 C yr ago. The results suggest that the influence of climate change on the overall erosional sediment budget is significant, mainly because of a change in the erosion regime coupled with an increase in mass movements. The most effective mechanism to increase landslide activity in this environment is a highly variable climate on interannual timescales. In contrast, Quaternary changes in erosional budgets due to variations in moisture regimes is small in the Santa Maria Basin. Because the magnitude of a potential increase in background erosion as well as enhanced landsliding is smaller than typical levels of uncertainty of erosional budgets for such large basins, it is not likely that climate-driven erosional unloading can influence tectonic style and rates in this semiarid environment on time scales of several thousands to a few tens of thousands of years.

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Section: Discussionmentioning

confidence: 99%

“…1). Compared to the present, this interval was characterized by increased humidity (Fox and Strecker 1991;van der Hammen and Absy 1994;Wirrmann and Mourguiart 1995;Ledru et al 1996;Godfrey et al 1997;Turcq et al 1997;Haselton et al 2002) and a stronger ENSO influence Beaufort et al 2001;Tudhope et al 2001) (Fig. 1).…”

Section: Introductionmentioning

confidence: 89%

Late Pleistocene Climate Change and Erosion in the Santa Maria Basin, NW Argentina

Trauth¹,

Bookhagen²,

Müller³

et al. 2003

Journal of Sedimentary Research

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“…26,000-'55,000 BP; Van der Hammen et al, 1992a; see also Ledru et al, 1996). These gravels form today the lower terrace of the river.…”

Section: History Of River Sedimentation and Dune Xeldsmentioning

confidence: 98%

“…From the palynological and Quaternary geological studies in the northern Andes, we know that the Middle Pleniglacial is, in general, a very wet and relatively cold period, with some changes toward somewhat warmer and colder intervals, while the Upper Pleniglacial (including the LGM) is very cold and very dry (Ledru et al, 1996). During the Middle Pleniglacial, glaciers of the Andes reached their maximum extension and huge masses of sand and gravel of glacio#uvial origin were deposited on the high plains.…”

Section: History Of River Sedimentation and Dune Xeldsmentioning

confidence: 99%

Neogene and Quaternary history of vegetation, climate, and plant diversity in Amazonia

Hammen

Hooghiemstra

2000

Quaternary Science Reviews

279

120

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“…(Ledru et al, 1996;Ferraz-Vicentini and SalgadoLabouriau, 1996). So, even the climatic conditions that could have favoured such landforms are questioned.…”

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confidence: 99%

Soil morphological control on saline and freshwater lake hydrogeochemistry in the Pantanal of Nhecolândia, Brazil

et al. 2008

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Abstract:Joint pedological, geochemical, hydrological and geophysical investigations were performed to study the coexistence of saline and freshwater lakes in close proximity and similar climatic conditions in the Nhecolândia region, Pantanal wetlands in Brazil. The saline lakes are concentrically surrounded by green sandy loam horizons, which cause differential hydrological regimes.Mg-calcite, K-silicates, and amorphous silica precipitate in the soil cover, whereas Mgsilicates and more soluble Na-carbonates are concentrated in the topsoil along the shore of the saline lake. In saline solutions, some minor elements (As, Se) reach values above the water quality recommendations, whereas others are controlled and incorporated in solid phases (Ba, Sr). Locally, the destruction of the sandy loam horizons generates very acidic soil solution 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

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The last 50,000 years in the Neotropics (Southern Brazil): evolution of vegetation and climate

Cited by 242 publications

References 15 publications

Late Pleistocene Climate Change and Erosion in the Santa Maria Basin, NW Argentina

Late Pleistocene Climate Change and Erosion in the Santa Maria Basin, NW Argentina

Neogene and Quaternary history of vegetation, climate, and plant diversity in Amazonia

Soil morphological control on saline and freshwater lake hydrogeochemistry in the Pantanal of Nhecolândia, Brazil

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