Refinement of three-dimensional multilayer models of basins and crustal environments by inversion of gravity and magnetic data

Gallardo, Luis A.; Pérez-Flores, M. A.; Gómez‐Treviño, Enrique

doi:10.1016/j.tecto.2004.10.010

Cited by 33 publications

(19 citation statements)

References 22 publications

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“…A joint inversion of magnetic and gravity data, which are related to the same underlying geologic structures and thus may contain complementary information, can reduce the inherent nonuniqueness and the limitations of the inverse problem of individual geophysical methods (e.g., Lines et al, 1988;Haber and Oldenburg, 1997;Gallardo and Meju, 2003). Examples of joint inversion of magnetic and gravity data were presented and discussed by several studies, such as Fedi and Rapolla (1999), Gallardo et al (2005) andde Castro (2011).…”

Section: Two-dimensional Joint Modeling Approachmentioning

confidence: 99%

Geophysical evidence of pre-sag rifting and post-rifting fault reactivation in the Parnaíba basin, Brazil

et al. 2016

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Abstract. This study investigated the rifting mechanism that preceded the prolonged subsidence of the Paleozoic Parnaíba basin in Brazil and shed light on the tectonic evolution of this large cratonic basin in the South American platform. From the analysis of aeromagnetic, aerogravity, seismic reflection and borehole data, we concluded the following: (1) large pseudo-gravity and gravity lows mimic graben structures but are associated with linear supracrustal strips in the basement.(2) Seismic data indicate that 120-200 km wide and up to 300 km long rift zones occur in other parts of the basins. These rift zones mark the early stage of the 3.5 km thick sag basin. (3) The rifting phase occurred in the early Paleozoic and had a subsidence rate of 47 m Myr −1 . (4) This rifting phase was followed by a long period of sag basin subsidence at a rate of 9.5 m Myr −1 between the Silurian and the late Cretaceous, during which rift faults propagated and influenced deposition. These data interpretations support the following succession of events: (1) after the Brasiliano orogeny (740-580 Ma), brittle reactivation of ductile basement shear zones led to normal and dextral oblique-slip faulting concentrated along the Transbrasiliano Lineament, a continentalscale shear zone that marks the boundary between basement crustal blocks. (2) The post-orogenic tectonic brittle reactivation of the ductile basement shear zones led to normal faulting associated with dextral oblique-slip crustal extension. In the west, pure-shear extension induced the formation of rift zones that crosscut metamorphic foliations and shear zones within the Parnaíba block. (3) The rift faults experienced multiple reactivation phases. (4) Similar processes may have occurred in coeval basins in the Laurentia and Central African blocks of Gondwana.

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Section: Two-dimensional Joint Modeling Approachmentioning

confidence: 99%

Geophysical evidence of pre-sag rifting and post-rifting fault reactivation in the Parnaíba basin, Brazil

et al. 2016

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“…The La Paz basin was modeled several ways, progressing from a simple two-layer model, where granite bedrock is overlain by basin-fi ll sediments, to a four-layer model that has an added basal layer of gabbro, which intrudes the granite, as well as a layer of volcaniclastic rocks situated between the basin-fi ll sediments and the granite. This four-layer model was based on the work of Gallardo et al (2005) as well as regional geologic mapping from INEGI (1987) and Hausback (1984). We chose to present representative models that are simple and most plausible based on the regional geology, because our goal is to understand the net basin geometry and the most prominent features within the basin.…”

Section: Gravity Data Processing and Modelingmentioning

confidence: 99%

“…Unit densities were designated based on the gravity and magnetic studies of Gallardo et al (2005), which took place on the southern end of the Baja California peninsula, as well as previous gravity work completed by Tatlow (2000) near Phoenix, Arizona, which investigated rocks similar in type and age to those found in the La Paz-Los Cabos transect of the Baja California peninsula. For all basin models, the granite density is 2.67 g/cm 3 , and the basin-fi ll density varies from 2.0 g/cm 3 to 2.2 g/cm 3 .…”

Section: Gravity Data Processing and Modelingmentioning

confidence: 99%

Geometry and evolution of rift-margin, normal-fault–bounded basins from gravity and geology, La Paz–Los Cabos region, Baja California Sur, Mexico

et al. 2011

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The southern end of the Baja California peninsula is cut by a north-striking, left-stepping, active, normal-fault system-the marginal fault system of the oblique-divergent plate boundary within the Gulf of California. We conducted gravity surveys across the normal-fault-bounded basins, and, along with optically stimulated luminescence dating of offset piedmont surfaces and geologic data, we estimated fault-slip rates and assessed fault patterns across basins, gaining insight into basin evolution to better understand the role of upper-crustal processes during development of an obliquely rifted plate margin. Gravity surveys across the La Paz, San Juan de los Planes, and San José del Cabo basins revealed basin depths ranging from ~500 to 3000 m. The La Paz basin is a half graben with two smaller basins that refl ect the two main eastdipping splays of the Carrizal fault. Within the San Juan de los Planes and San José del Cabo basins, there are buried faults, indicating that during the early stages of basin formation, strain was distributed across these smaller intrabasin faults prior to development of the basinbounding faults. Slip rates coupled with basin depths suggest that the La Paz and San Juan de los Planes basins began forming ca. 2-5 Ma, overlapping in time with the formation of the main plate boundary at this latitude. The San José del Cabo basin has the greatest depth to bedrock (1.6-2.7 km), signifying that it accommodates a greater slip rate or a longer duration of slip than the other faults within this system.

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“…Ramadass et al (2006) described a complex lithospheric configuration of the Dharwar Craton (India) based on the joint modeling of regional gravity and magnetic data. Gallardo et al (2005) proposed a threedimensional (3D) inversion method of potential field data for a structural investigation of basins and crustal environments. The resulting algorithm was applied to crustal and sedimentary basin environments in southern Baja California (Mexico), revealing 3D features of the subsurface.…”

Section: Introductionmentioning

confidence: 99%

Gravity and magnetic joint modeling of the Potiguar Rift Basin (NE Brazil): Basement control during Neocomian extension and deformation

Castro

2011

Journal of South American Earth Sciences

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Refinement of three-dimensional multilayer models of basins and crustal environments by inversion of gravity and magnetic data

Cited by 33 publications

References 22 publications

Geophysical evidence of pre-sag rifting and post-rifting fault reactivation in the Parnaíba basin, Brazil

Geophysical evidence of pre-sag rifting and post-rifting fault reactivation in the Parnaíba basin, Brazil

Geometry and evolution of rift-margin, normal-fault–bounded basins from gravity and geology, La Paz–Los Cabos region, Baja California Sur, Mexico

Gravity and magnetic joint modeling of the Potiguar Rift Basin (NE Brazil): Basement control during Neocomian extension and deformation

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