Crustal modeling of the North Atlantic from spectrally correlated free-air and terrain gravity

Leftwich, T. E.; Frese, Ralph R. B. von; Potts, Laramie V.; Kim, Hyung Rae; Roman, D. R.; Taylor, Patrick T.; Bartoň, Michael

doi:10.1016/j.jog.2005.05.001

Cited by 16 publications

(24 citation statements)

References 74 publications

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“…The analysis was conducted at 20 km altitude to reduce the effects of local terrain elevation and density errors (e.g. Leftwich et al 2005) and for comparing with regional EGM96 free‐air gravity estimates (Fig. 6c) that are well constrained by actual gravity observations (Lemoine et al 1998).…”

Section: Applicationsmentioning

confidence: 99%

“…TCFAGA maxima and minima in Figs 6(d) and 7(a) can reflect isostatic anomalies for mass columns with excess mantle and crust, respectively, and hence crust that is, respectively, too thin and thick to be in equilibrium with its topographic mass variations (e.g. von Frese et al 1997c; von Frese et al 1999; Potts & von Frese 2003; Leftwich et al 2005). For instance, the highly positive TCFAGA extending along the Indo‐European mountain belt may mark the excess mass generated as Gondwana collided with Laurasia and uplifted the Alps, Taurus, Caucasus, Zagros, Alborz, Kopeh‐Dagh, Hindu Kush and Himalayan Mountains along the collision zone (Fig.…”

Section: Applicationsmentioning

confidence: 99%

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Spherical prism gravity effects by Gauss-Legendre quadrature integration

Asgharzadeh¹,

Frese²,

Kim

et al. 2007

Geophysical Journal International

103

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S U M M A R YSatellite-measured regional gravity and terrain elevation data are becoming increasingly available for improving our understanding of the geological properties and history of the Earth, Moon, Mars, Venus and other planets. In assessing the geological significance of the existing and growing volumes of these regional data sets, there is great need for computing theoretical anomalous gravity fields from geological models in spherical coordinates. In the present study, we explicitly develop the elegant Gauss-Legendre quadrature formulation for numerically modelling the complete gravity effects (i.e. potential, vector and tensor gradient fields) of the spherical prism. As an application, we investigate the gradient components of the isostatic gravity anomalies that the upcoming Gravity Field and Steady State Ocean Circulation Explorer (GOCE) satellite mission is likely to map over a large tectonically active region of the Middle East centred on Iran.

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Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Spherical prism gravity effects by Gauss-Legendre quadrature integration

Asgharzadeh¹,

Frese²,

Kim

et al. 2007

Geophysical Journal International

103

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“…This distribution of crustal thickness is not as expected from an eastward migrating plume [ Foulger et al , 2003]. Leftwich et al [2005] found an abrupt change in the Moho depths determined from the seismic and gravity data in eastern Iceland. This may represent a change in crustal composition under eastern Iceland, as their results appear to show a connection between NE Iceland and the Jan Mayen micro‐continent, a conclusion also reached by Fedorova et al [2005].…”

Section: Discussion and Summarymentioning

confidence: 73%

“…Recent seismic studies of the area have found oceanic crustal thicknesses vary across the region; the Iceland Plateau exhibits thick oceanic crust [ Kodaira et al , 1998] whereas extremely thin crust has been observed in the Norwegian Basin [ Breivik et al , 2006]. It has recently been proposed that the Jan Mayen micro‐continent may extend into eastern Iceland [ Fedorova et al , 2005; Leftwich et al , 2005; Foulger , 2006]. A satellite gravity inversion incorporating a lithosphere thermal gravity anomaly correction has been used to determine the crustal thickness of the NE Atlantic.…”

Section: Introductionmentioning

confidence: 99%

Evidence for thin oceanic crust on the extinct Aegir Ridge, Norwegian Basin, NE Atlantic derived from satellite gravity inversion

Greenhalgh¹,

Kusznir²

2007

Geophysical Research Letters

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Satellite gravity inversion incorporating a lithosphere thermal gravity correction has been used to map crustal thickness and lithosphere thinning factor for the NE Atlantic. Predicted oceanic crustal thicknesses in the Norwegian Basin are between 4 and 7 km on the extinct Aegir Ridge, increasing to 9 – 14 km at the margins, consistent with volcanic margin continental breakup at the end of the Paleocene. The observation (from gravity inversion and seismic refraction studies) of thin oceanic crust produced by the Aegir Ridge in the Oligocene may have implications for the temporal evolution of asthenosphere temperature under the NE Atlantic during the Tertiary. Thin Oligocene oceanic crust may imply cool (normal) asthenosphere temperatures during the Oligocene in contrast to elevated asthenosphere temperatures in the Paleocene and Miocene‐Recent as indicated by the formation of volcanic margins and Iceland respectively.

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“…The technique is based on the Parker-Oldenburg iterative method (Parker 1973;Oldenburg 1974). The inversion of 3-D gravity anomalies assumes that the causative origin of the field is a density interface at depth, locally constrained and tied with seismic refraction observations described in previous compilation (Johansen et al 1988;Rudjord 1990;Planke et al 1991;Weigel et al 1995;Kodaira et al 1998;Smallwood et al 1999;Mjelde et al 2005;Leftwich et al 2005;Breivik et al 2006Breivik et al , 2008Voss et al 2009;Mjelde et al 2009a,b;Grad et al 2009).…”

Section: Moho Depth From 3-d Gravity Inversionmentioning

confidence: 99%

Insights from the Jan Mayen system in the Norwegian-Greenland sea-I. Mapping of a microcontinent

Péron‐Pinvidic

Gernigon

Gaina

et al. 2012

Geophysical Journal International

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SUMMARY In this contribution, we present a model of microcontinent architecture within a system that involves a complex rifted margin setting and different phases of deformation and continental breakup. Our case study is the Jan Mayen Microcontinent (JMMC) located in the central part of the Norwegian–Greenland Sea. We have revised its basement and sedimentary geometries using modern and vintage seismic reflection profiles, and updated potential field data. The northern part of the JMMC consists of a ∼10–15 km thick continental crust body flanked by two major sedimentary basins. We propose that the microcontinent is divided into six distinct segments, characterized by different basement and sedimentary architectures. The shallow stratigraphy is well imaged and has been detailed. Three distinct sedimentary units have been defined together with pronounced reflectors (JA, Red, JO and F), related to erosional, magmatic, thermal or uplift events. The continent–ocean boundary has been revised together with the mapping of the distinct volcanic events that characterize the evolution of the microcontinent. A companion paper aims to further detail the interpretation of the JMMC structure presented here by constraining the conjugated mid‐Norwegian and mid‐East Greenland structures.

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Crustal modeling of the North Atlantic from spectrally correlated free-air and terrain gravity

Cited by 16 publications

References 74 publications

Spherical prism gravity effects by Gauss-Legendre quadrature integration

Spherical prism gravity effects by Gauss-Legendre quadrature integration

Evidence for thin oceanic crust on the extinct Aegir Ridge, Norwegian Basin, NE Atlantic derived from satellite gravity inversion

Insights from the Jan Mayen system in the Norwegian-Greenland sea-I. Mapping of a microcontinent

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