Cenário regional das oscilações climáticas quaternárias

Storani, Daniel Luís

doi:10.47749/t/unicamp.2015.957911

Cited by 1 publication

(9 citation statements)

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“…In total, the absolute dating of 114 Optically Stimulated Luminescence (OSL) surface cover samples associated with low river terraces were employed in the present study. In detail, all data collected from 30 rivers were obtained by the Environmental Analysis and Territorial Dynamics of the Laboratory of Geomorphology and Environmental Analysis IG-UNICAMP [27,34,36,37,41,42,44,[66][67][68][69][70][71][72][73].…”

Section: Selection and Spatialization Of Geochronological Datamentioning

confidence: 99%

“…Within the scope of the continental morphological compartments of Northeast Brazil, absolute ages correspond to surficial covers associated with low terraces located at the middle course of the Itapicuru (see box C of Figure 1) [42,69,72] and Grande (see box B) rivers, both in the Southern Sertaneja Depression. Meanwhile, the areas analyzed in Southeast Brazil are associated with the Paulista Peripheral Depression [27,34,37], the Paulista Western Plateau [34,68], and the Uberlândia-Uberaba plateau on the edge of the Brazilian Central Plateau [70].…”

Section: Selection and Spatialization Of Geochronological Datamentioning

confidence: 99%

“…As illustrated in Figure 3, the terraces rise in the river valley at levels ranging from 1 to 20 meters above the current river channel, and are always confined by the slopes that delimit the topography of these river forms [34]. Is important to highlight that the number of levels, distance, and elevation in relation to the river channel varies, since it depends on local environmental characteristics and the intensity of exogenous processes absorbed by the river system.…”

Section: Geomorphic Characterization Of Low Terracesmentioning

confidence: 99%

“…In detail, yellow dots correspond to the samples from the Brazilian Central Plateau [70]. Brown dots correspond to samples from the Paulista Western Plateau [34,68]. Orange dots correspond to samples from the Paulista Peripheral Depression [7,37,68].…”

Section: Paulista Peripheral Depression Paulista Western Plateau and ...mentioning

confidence: 99%

“…However, these complex responses concerning Tropical Rivers (TR) and Holocene Climate Pulses (HCP), are still largely unexplored and contrast with the greater progress in studies focusing on the complexities in large river systems (Basin area > 10 6 km 2 ) [27][28][29][30][31]. In addition, climate inputs can generate different responses that depend on the attributes and spatial dimensions of the river system, indicating that smaller rivers hold important continental records on the Holocene paleoclimate events due to their greater sensitivity to subtle disturbances [11,20,[32][33][34][35][36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

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Genesis and Distribution of Low Fluvial Terraces Formed by Holocene Climate Pulses in Brazil

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Lämmle

et al. 2022

Water

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Low fluvial terraces present azonal spatialization, encompassing several geomorphological compartments and climate zones in Brazil. Their genesis is directly related to river dynamics. When influenced by allogenic forces, such as Holocene climate pulses, it results in channel incision and posterior abandonment of the floodplain. Relatively plain landforms at different altimetric levels identified between the current floodplain and hillslope (low river terraces) are a result of these processes. Previous works using Optically Stimulated Luminescence (OSL) in low terraces of several rivers in Brazil have indicated morpho-chronologic similarities between depositional events, raising the hypothesis of feedbacks and fluvial adjustments relatively simultaneous to Holocene climate events. Considering these dynamics, this study employed OSL to obtain absolute dating information for 114 samples taken from distinct levels of the low river terraces of 30 rivers in Brazil, integrating the database of the IG-UNICAMP laboratory of Geomorphology and Environmental Analysis. Based on the data and statistical analysis (cluster and correlation analysis), this study aimed to identify relationships between different variables which might have controlled spatial homogenous and heterogeneous feedbacks during distinct paleoenvironmental contexts. The proposed methodology tested a fundamental hypothesis of the regional climatic geomorphology, and the results obtained may contribute to future discussions on the relationship between low river terraces and anthropic occupation.

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