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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Efficient equivalent-layer technique for processing irregularly spaced magnetic data on uneven surfaces Available to Purchase
Convolutional equivalent layer for magnetic data processing Available to Purchase
Magnetic amplitude inversion for depth-to-basement and apparent magnetization-intensity estimates Available to Purchase
Convolutional equivalent layer for gravity data processing Available to Purchase
Generalized positivity constraint on magnetic equivalent layers Available to Purchase
Fast 3D magnetic inversion of a surface relief in the space domain Available to Purchase
Correct structural index in Euler deconvolution via base-level estimates Available to Purchase
Fast iterative equivalent-layer technique for gravity data processing: A method grounded on excess mass constraint Available to Purchase
The monogenic signal of potential-field data: A Python implementation Available to Purchase
Tesseroids: Forward-modeling gravitational fields in spherical coordinates Available to Purchase
Edge detection of potential-field sources using scale-space monogenic signal: Fundamental principles Available to Purchase
Connecting onshore-offshore Campos Basin structures: Interpretation of high-resolution airborne magnetic data Available to Purchase
Geophysical tutorial: Euler deconvolution of potential-field data Open Access
Estimating the nature and the horizontal and vertical positions of 3D magnetic sources using Euler deconvolution Available to Purchase
Crustal architecture of the Almada Basin, NE Brazil: an example of a non-volcanic rift segment of the South Atlantic passive margin Available to Purchase
Abstract The Almada Basin, located in the southern Bahia State segment of NE Brazil, shares a similar sedimentation history and stress regime with the other eastern Brazilian basins. But when considering the composition of the transitional crust, a remarkably different behaviour is observed between the Almada Basin and the other eastern Brazilian basins. The architectural elements of the basin such as the reflection Moho discontinuity, the oceanic and continental basements, and the sedimentary section, as well as the tectonic style, are discussed in this study using gravity, seismic, regional geology and well-drilling results. The Almada Basin is part of a continental rift system that developed during the Early Cretaceous, heralding the Gondwana break-up and subsequently evolving into a passive divergent margin. Deep seismic profiles show the progressive thinning of the continental crust but there is no clear evidence of mantle exhumation. The Almada Basin is the conjugate margin of the South Gabon Basin in West Africa. Although both basins display similar stratigraphic record and geological evolution, the rifting mechanism resulted in a considerable asymmetric break-up. The Almada Basin is floored by the Itabunas–Salvador–Curaçá Belt of the São Francisco Craton and is characterized by Palaeoproterozoic granulites in a high-angle east-dipping thrust fault regime. However, the South Gabon Basin lies on the Neoproterozoic West Congolian Belt that is made up of low- to medium-grade metamorphic rocks in a low-angle thrust tectonic regime. The Precambrian basement fabric of both the Almada and South Gabon basins is marked by lithospheric-scale discontinuities that controlled the implantation of the rift zone and the extension style during the Mesozoic. The strong basement structural inheritance can be recognized in both the geological and geophysical records. The key architectural elements of a volcanic margin, such as large igneous provinces, seaward-dipping reflectors and the basinal syn-rift magmatism, are not recognized in the Almada Basin. Although the South Atlantic margin is mostly volcanic in the southernmost segment, the presence of these two non-volcanic segments – the southern Bahia State and the southern Gabon – are important as a record of the differences in the geotectonic process that governed the formation of the South Atlantic divergent margins.