Long-term landscape evolution and post-rift reactivation in the southeastern Brazilian passive continental margin: Taubaté basin

A multidisciplinary approach is used to analyze the Cenozoic uplift history of South America. Residual depth anomalies of oceanic crust abutting this continent help to determine the pattern of present‐day dynamic topography. Admittance analysis and crustal thickness measurements indicate that the elastic thickness of the Borborema and Altiplano regions is ≤10 km with evidence for sub‐plate support at longer wavelengths. A drainage inventory of 1827 river profiles is assembled and used to investigate landscape development. Linear inverse modeling enables river profiles to be fitted as a function of the spatial and temporal history of regional uplift. Erosional parameters are calibrated using observations from the Borborema Plateau and tested against continent‐wide stratigraphic and thermochronologic constraints. Our results predict that two phases of regional uplift of the Altiplano plateau occurred in Neogene times. Regional uplift of the southern Patagonian Andes also appears to have occurred in Early Miocene times. The consistency between observed and predicted histories for the Borborema, Altiplano, and Patagonian plateaux implies that drainage networks record coherent signals that are amenable to simple modeling strategies. Finally, the predicted pattern of incision across the Amazon catchment constrains solid sedimentary flux at the Foz do Amazonas. Observed and calculated flux estimates match, suggesting that erosion and deposition were triggered by regional Andean uplift during Miocene times.

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“…In the same region, Franco‐Magalhaes et al . [] and Cogné et al . [] identify Eocene and post‐Miocene cooling events.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal uplift history of South America from calibrated drainage analysis

Tribaldos

White

Hoggard

2017

Geochem Geophys Geosyst

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“…Due to a lack of postrift geological markers and poor age constraints on the timing of deformation on major structures, the tectonic history of the southwest African continental margin is incomplete. Recent investigations have alluded to the potential importance of postrift structural reactivation and neotectonic activity to the development of the South African margin [Viola et al, 2005[Viola et al, , 2012Brandt et al, 2003Brandt et al, , 2005Andreoli et al, 1996Andreoli et al, , 2009de Beer, 2012;Kounov et al, 2009;Wildman et al, 2015], and postrift reactivation has been advocated by investigations of other so-called "passive" continental margins Cogné et al, 2011;Holford et al, 2014;Franco-Magalhaes et al, 2014;Ksienzyk et al, 2014;Leprêtre et al, 2015]. Constraining the surface response to postrift deformation over different length scales will have major implications for conceptual geomorphic models of high-elevation continental margins that envisage regional patterns of denudation triggered by regional base level fall and augmented by long-wavelength epeirogenic/flexural uplift.…”

Section: Introductionmentioning

confidence: 99%

The chronology and tectonic style of landscape evolution along the elevated Atlantic continental margin of South Africa resolved by joint apatite fission track and (U‐Th‐Sm)/He thermochronology

et al. 2016

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Atlantic-type continental margins have long been considered "passive" tectonic settings throughout the entire postrift phase. Recent studies question the long-term stability of these margins and have shown that postrift uplift and reactivation of preexisting structures may be a common feature of a continental margin's evolution. The Namaqualand sector of the western continental margin of South Africa is characterized by a ubiquitously faulted basement but lacks preservation of younger geological strata to constrain postrift tectonic fault activity. Here we present the first systematic study using joint apatite fission track and apatite (U-Th-Sm)/He thermochronology to achieve a better understanding on the chronology and tectonic style of landscape evolution across this region. Apatite fission track ages range from 58.3 ± 2.6 to 132.2 ± 3.6 Ma, with mean track lengths between 10.9 ± 0.19 and 14.35 ± 0.22 μm, and mean (U-Th-Sm)/He sample ages range from 55.8 ± 31.3 to 120.6 ± 31.4 Ma. Joint inverse modeling of these data reveals two distinct episodes of cooling at approximately 150-130 Ma and 110-90 Ma with limited cooling during the Cenozoic. Estimates of denudation based on these thermal histories predict approximately 1-3 km of denudation coinciding with two major tectonic events. The first event, during the Early Cretaceous, was driven by continental rifting and the development and removal of synrift topography. The second event, during the Late Cretaceous, includes localized reactivation of basement structures as well as regional mantle-driven uplift. Relative tectonic stability prevailed during the Cenozoic, and regional denudation over this time is constrained to be less than 1 km.

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“…The regulation of these impacts falls under the "European Agreement of the Landscape" [9]. Because the agreement defines landscape as any part of the territory perceived to have been influenced by the population, as a result of the action and interaction between the natural and human factors, the establishment of measures for its protection, management and arrangement in accordance with the European standards was deemed necessary [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…J. Geo-Inf. 2016, 5, 2 2 of 24 and human factors, the establishment of measures for its protection, management and arrangement in accordance with the European standards was deemed necessary [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Remote Sensing and GIS Applied to the Landscape for the Environmental Restoration of Urbanizations by Means of 3D Virtual Reconstruction and Visualization (Salamanca, Spain)

Martínez-Graña

Valdés

2016

IJGI

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The key focus of this paper is to establish a procedure that combines the use of Geographical Information Systems (GIS) and remote sensing in order to achieve simulation and modeling of the landscape impact caused by construction. The procedure should be easily and inexpensively developed. With the aid of 3D virtual reconstruction and visualization, this paper proposes that the technologies of remote sensing and GIS can be applied to the landscape for post-urbanization environmental restoration. The goal is to create a rural zone in an urban development sector that integrates the residential areas and local infrastructure into the surrounding natural environment in order to measure the changes to the preliminary urban design. The units of the landscape are determined by means of two cartographic methods: (1) indirect, using the components of the landscape; and (2) direct methods, using the landscape's elements. The visual basins are calculated for the most transited by the population points, while establishing the zones that present major impacts for the urbanization of their landscape. Based on this, the different construction types are distributed (one-family houses, blocks of houses, etc.), selecting the types of plant masses either with ornamentals or integration depending on the zone; integrating water channels, creating a water channel in recirculation and green spaces and leisure time facilities. The techniques of remote sensing and GIS allow for the visualization and modeling of the urbanization in 3D, simulating the virtual reality of the infrastructure as well as the actions that need to be taken for restoration, thereby providing at a low cost an understanding of landscape integration before it takes place.

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Long-term landscape evolution and post-rift reactivation in the southeastern Brazilian passive continental margin: Taubaté basin

Cited by 26 publications

References 38 publications

Spatial and temporal uplift history of South America from calibrated drainage analysis

Spatial and temporal uplift history of South America from calibrated drainage analysis

The chronology and tectonic style of landscape evolution along the elevated Atlantic continental margin of South Africa resolved by joint apatite fission track and (U‐Th‐Sm)/He thermochronology

Remote Sensing and GIS Applied to the Landscape for the Environmental Restoration of Urbanizations by Means of 3D Virtual Reconstruction and Visualization (Salamanca, Spain)

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