Structural Fabric of the North American Continent, as Defined by Gravity Trends

Thomas, Mike; Grieve, R. A. F.; Sharpton, V. L.

doi:10.1007/978-94-017-0833-3_18

Cited by 8 publications

(10 citation statements)

References 36 publications

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“…Its magnitude is dependent on the density contrast across the domain boundary, the vertical extent of the contrast, the dip of the boundary and its depth of burial (THOMAS et al, 1992). The steepest horizontal gradient of a gravity anomaly will be located directly over the edge of the body if the edge is vertical and far removed from all other edges or sources (THOMAS et al, 1992).…”

Section: Discussion and Resultsmentioning

confidence: 99%

“…That is because the relation between the structural index and the subsurface geologic features forms the basis for the inversion process. This has been extensively discussed by THOMAS et al, (1992), andREID et al, (1990). For regional interpretation and taking into account the contact model, REID et al, (1990) have shown that the lower structural indices ranging from 0 to 1 are better depth estimators.…”

Section: Euler Deconvolutionmentioning

confidence: 99%

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Structural Setting of Northern Tunisia Insights from Gravity Data Analysis Jendouba Case Study

Nasr

Amiri

Inoubli

et al. 2010

Pure Appl. Geophys.

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Detailed gravity data in conjunction with available surface geology are analyzed to infer the organization of the underlying structures in Jendouba area. Gravity data analysis benefits from the gravity Bouguer anomaly, upward continuations, residual distribution, derivatives and Euler deconvolved maps. The main results display a positive amplitude gravity anomaly as the response of Triassic evaporitic bodies and important NE trending features at the boundaries between the Triassic outcrops and their enveloping strata. Integration of gravity, geological and structural maps let to the identification of major structural directions and trends of the study area. It confirms some structural elements gathered from outcrops. It defines also new ones.

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Section: Discussion and Resultsmentioning

confidence: 99%

Section: Euler Deconvolutionmentioning

confidence: 99%

Structural Setting of Northern Tunisia Insights from Gravity Data Analysis Jendouba Case Study

Nasr

Amiri

Inoubli

et al. 2010

Pure Appl. Geophys.

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“…Horizontal-gradient maps on the other hand are vivid, simple and intuitive derivative products which reveal the anomaly texture and highlight the anomaly-pattern discontinuities. Because long wavelength features are eliminated and gradients serve to enhance edges between crustal blocks of differing density (Thomas et al, 1992) horizontal gravity gradient are found extremely useful in delineating the boundaries of crustal domains (Cordell and Grauch, 1985;Sharpton et al, 1987;Thomas et al, 1987). The horizontal gradient simply indicates the presence of a measure of the lateral change in density and requires no assumptions about the sources.…”

Section: Introductionmentioning

confidence: 98%

“…Its magnitude is dependent on the density contrast across the domain boundary, the vertical extent of the contrast, the dip of the boundary and its depth of burial (Thomas et al, 1992). The steepest horizontal gradient of a gravity anomaly will be located directly over the edge of the body if the edge is vertical and far removed from all other edges or sources (Thomas et al, 1992). The horizontal gradient of Bouguer gravity is used here to define a gravity trend map covering Peninsular India 14°N, from which is derived a map of first order gravity domains.…”

Section: Introductionmentioning

confidence: 99%

“…The horizontal gradient simply indicates the presence of a measure of the lateral change in density and requires no assumptions about the sources. Its magnitude is dependent on the density contrast across the domain boundary, the vertical extent of the contrast, the dip of the boundary and its depth of burial (Thomas et al, 1992). The steepest horizontal gradient of a gravity anomaly will be located directly over the edge of the body if the edge is vertical and far removed from all other edges or sources (Thomas et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Structural fabric of the Southern Indian shield as defined by gravity trends

Kumar

Singh

2009

Journal of Asian Earth Sciences

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Insights into crustal architecture and tectonics across Palghat Cauvery Shear Zone, India from combined analysis of gravity and magnetic data

et al. 2020

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The Palghat Cauvery Shear Zone (PCSZ), which dissects the Southern Granulite Terrane (SGT), evoked much attention for last two-three decades as it offers an enticing opportunity to understand Precambrian tectonics. Many studies suggest that it is a suture zone or a terrane boundary, but tectonic evolution is mainly derived from structural and geochronological evidences. The present gravity-magnetic study provides insight into both shallow and deeper crustal architecture and addresses the issues related to validation/modification of the existing tectonic realm. A total of 3,650 gravity and magnetic measurements were made covering 8,640 km 2 area, represented by high-grade metamorphic rocks and acid intrusives of Archean to Neoproterozoic age. Representative rock samples were also collected for determination of petrophysical properties (density and susceptibility) which have augmented the understanding of gravity-magnetic signature. The gravity anomaly map and subsequent modelling suggest an occurrence of a high-density batholith at mid-crustal level at the central part of the area. The magnetic anomaly map reveals that ENE-WSW trending linear magnetic low zone is coincident with a residual gravity high, which probably indicates the fossil of an oceanic crust. The horizontal gradient of gravity-magnetic data reveals the shallow crust, which is bounded by Palghat Cauvery Shear Zone (PCSZ) and Dharapuram Shear Zone (DSZ), and separates two terranes in terms of density and susceptibilities. The study suggests N-S verging compressional tectonics had led to closure of an ocean, imprints of which is well manifested in gravity and magnetic maps.

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Structural Fabric of the North American Continent, as Defined by Gravity Trends

Cited by 8 publications

References 36 publications

Structural Setting of Northern Tunisia Insights from Gravity Data Analysis Jendouba Case Study

Structural Setting of Northern Tunisia Insights from Gravity Data Analysis Jendouba Case Study

Structural fabric of the Southern Indian shield as defined by gravity trends

Insights into crustal architecture and tectonics across Palghat Cauvery Shear Zone, India from combined analysis of gravity and magnetic data

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