Statistics for Spatial Data.

. The South Atlantic rift basin evolved as a branch of a large Jurassic–Cretaceous intraplate rift zone between the African and South American plates during the final break-up of western Gondwana. While the relative motions between South America and Africa for post-break-up times are well resolved, many issues pertaining to the fit reconstruction and particularly the relation between kinematics and lithosphere dynamics during pre-break-up remain unclear in currently published plate models. We have compiled and assimilated data from these intraplated rifts and constructed a revised plate kinematic model for the pre-break-up evolution of the South Atlantic. Based on structural restoration of the conjugate South Atlantic margins and intracontinental rift basins in Africa and South America, we achieve a tight-fit reconstruction which eliminates the need for previously inferred large intracontinental shear zones, in particular in Patagonian South America. By quantitatively accounting for crustal deformation in the Central and West African Rift Zones, we have been able to indirectly construct the kinematic history of the pre-break-up evolution of the conjugate west African–Brazilian margins. Our model suggests a causal link between changes in extension direction and velocity during continental extension and the generation of marginal structures such as the enigmatic pre-salt sag basin and the Sao Paulo High. We model an initial E–W-directed extension between South America and Africa (fixed in present-day position) at very low extensional velocities from 140 Ma until late Hauterivian times (≈126 Ma) when rift activity along in the equatorial Atlantic domain started to increase significantly. During this initial ≈14 Myr-long stretching episode the pre-salt basin width on the conjugate Brazilian and west African margins is generated. An intermediate stage between ≈126 Ma and base Aptian is characterised by strain localisation, rapid lithospheric weakening in the equatorial Atlantic domain, resulting in both progressively increasing extensional velocities as well as a significant rotation of the extension direction to NE–SW. From base Aptian onwards diachronous lithospheric break-up occurred along the central South Atlantic rift, first in the Sergipe–Alagoas/Rio Muni margin segment in the northernmost South Atlantic. Final break-up between South America and Africa occurred in the conjugate Santos–Benguela margin segment at around 113 Ma and in the equatorial Atlantic domain between the Ghanaian Ridge and the Piaui-Ceara margin at 103 Ma. We conclude that such a multi-velocity, multi-directional rift history exerts primary control on the evolution of these conjugate passive-margin systems and can explain the first-order tectonic structures along the South Atlantic and possibly other passive margins.

/pdf/kinematics-of-the-south-atlantic-rift-2msc72kclv.pdf

Kinematics of the South Atlantic rift

Sedimentary record of Andean mountain building

Tectonic Regimes of the Central and Southern Andes: Responses to Variations in Plate Coupling During Subduction

Risk management plays a key role in uncertain times, preventing corporations from acting rashly and incorrectly, allowing them to become flexible and resilient. A global turbulence such as the COVID-19 pandemic has had a strong impact on individual companies and entire economic sectors, raising the question of whether a paradigm shift is necessary, in order to enable a new cycle of development that is much environmentally, socially and economically sustainable. This environmental and socio-economic context of profound uncertainty forces organizations to consider more carefully the risk factors affecting their business continuity, as well as how these factors relate to sustainability issues. However, there is a gap in knowledge about how risk management systems relate to sustainability management systems, and how both of them exert influence on business performance, especially from a theoretical point of view. The aim of this study is to address this gap, by developing a new interpretative framework for the analysis of risk management strategies in organizations. This approach has been identified in economic hermeneutics as an innovative methodological tool to improve the knowledge of risk and design the most appropriate management strategies. The paper provides two main results: the first one is the construction of a theoretical model that relates risk management to sustainability management; the second one is an operational framework of multidimensional risk assessment useful for analysis at different levels (business, competitive scenario and system). Finally, the model also makes it possible to carry out a sustainability assessment through risk evaluation in the perspective of the sustainable development goals.

/pdf/flexibility-and-resilience-in-corporate-decision-making-a-4v7q1nry3b.pdf

Flexibility and Resilience in Corporate Decision Making: A New Sustainability-Based Risk Management System in Uncertain Times

A review about the mechanisms associated with active deformation, regional uplift and subsidence in southern South America

We have developed an equivalent-source method for performing reduction to the pole and related transforms from magnetic data measured on unevenly spaced stations at different elevations. The equivalent source is composed of points located vertically beneath the measurement stations, and their magnetic properties are chosen in such a way that the reduced-to-the-pole magnetic field generated by them is represented by an inverse-distance Newtonian potential. This function, which attenuates slowly with distance, provides better coverage for discrete data points. The magnetization intensity is determined iteratively until the observed field is fitted within a certain tolerance related to the level of noise; thus, advantages in computer time are gained over the resolution of large systems of equations. In the case of induced magnetization, the iteration converges well for verticalor horizontal inclinations, and results are stable if noise is taken into account properly. However, for a range of intermediate incl...

Reduction to the pole and transformations of scattered magnetic data using Newtonian equivalent sources

/pdf/a-stretching-model-to-explain-the-salado-basin-argentina-1nwd2pfxbw.pdf

A stretching model to explain the salado basin (argentina)

Global warming is one of the major challenges that needs to be dealt with in the coming decades. In particular, the Intergovernmental Panel on Climate Change (IPCC) published a special report in 20...

Climate change and pandemics: New challenges for science and technology

The generalized Hilbert transforms of potential fields, particularly magnetic fields, provide a useful resource for improving interpretation. Even though x- and y-Hilbert transforms of a potential field on a plane can be approximately computed from the whole observed field, they are locally independent of the observations when working on reduced areas of the plane, and therefore, on those areas, Hilbert transforms can be combined with them to better constrain and stabilize local inversions. Extended Euler deconvolution, based on Euler’s homogeneity equation, makes extensive use of this principle. We investigated closed-form expressions for evaluating in the space domain the generalized x- and y-Hilbert transforms of magnetic fields generated by single point sources, given in the form of dipoles, monopoles, and Newtonian potential type sources. Apart from providing a way to calculate Hilbert transforms via equivalent sources, this approach, adding little computer effort, can be applied to solve loc...

Generalized Hilbert transforms of the effect of single magnetic sources

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