Evidence of partial melting beneath a continental margin: case of Dhofar, in the Northeast Gulf of Aden (Sultanate of Oman)

Basuyau, C.; Tiberi, Christel; Leroy, Sylvie; Stuart, G. W.; Al-Lazki, Ali; Al-Toubi, K.; Ebinger, C. J.

doi:10.1111/j.1365-246x.2009.04438.x

Cited by 28 publications

(37 citation statements)

References 59 publications

(98 reference statements)

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“…The onset of the volcanism is supposed to mark the continental break-up and early drift phases. Low velocity anomalies in the upper mantle are imaged below the northern margin of the Gulf of Aden, indicating that partial melting occurs under the rift basins (Basuyau et al 2010), which could be related to the Afar plume influence affecting even the eastern parts of the Gulf (Leroy et al 2010a). However, several studies indicate the possibility of mantle exhumation in the magma-poor segments of the Gulf of Aden, particularly eastwards of the Alula-Fartak Fracture Zone (Leroy et al 2010b;Leroy et al 2012).…”

Section: " "mentioning

confidence: 99%

Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea–Gulf of Aden conjugate margins

Mohriak

Leroy

2012

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To cite this version:Webster Ueipass Mohriak, Sylvie Leroy. Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea-Gulf of Aden conjugate margins. Special Publication -Geological Society of London, 2012, 369, pp.1-40. <10.1144/SP369.17>. !" " " ARCHITECTURE OF RIFTED CONTINENTAL MARGINS AND BREAKUP EVOLUTION: INSIGHTS FROM THE SOUTH ATLANTIC, NORTH ATLANTIC AND RED SEA -GULF OF ADEN CONJUGATE MARGINS

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Section: " "mentioning

confidence: 99%

Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea–Gulf of Aden conjugate margins

Mohriak

Leroy

2012

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“…Other vol canic fields exist on the southern conjugate margin in Somalia, near Bosaso and Qandala (Fantozzi and Sgavetti, 1998). Moreover, some recent magmatism has been observed offshore in the oceancontinent transition of the eastern Gulf of Aden margin (Lucazeau et al, 2009;Autin et al, 2010;Watremez et al, 2011), offset from the axis of the Sheba ridge (d' Acremont et al, 2010) and be low the adjoining continental margin in the north (Basuyau et al, 2010).…”

Section: Geodynamic Settingmentioning

confidence: 99%

“…At a more local scale, the western Gulf of Aden was imaged in Korostelev et al (2014) using teleseismic tomography, and inferred smallscale upwelling beneath young rift flank volcanoes. Basuyau et al (2010) computed a P wave velocity model for the region of Dhofar (Oman) using the Dhofar Seismic Ex periment network, and imaged two lowvelocity anomalies in the upper mantle beneath the northern continuity of AlulaFartak and SocotraHadbeen fracture zones; they also inferred partial melting associated with these two anomalies.…”

Section: Previous Seismologic Studiesmentioning

confidence: 99%

“…The events were picked using SAC (Seismic Analysis Code; http:// ds .iris .edu /ds /nodes /dmc /forms /sac/) software, after which we computed 11339 delay times with re spect to the ak135 reference Earth model (Kennett et al, 1995). The 2003-2006 events were picked by Basuyau et al (2010) using the waveform crosscorrela tion method of VanDecar and Crosson (1990). For the 2009-2011 events, we chose to handpick the earthquake arrivals as it took the same time and was more precise in our case.…”

Section: Datamentioning

confidence: 99%

“…2). In addition, we used the recordings from 30 broadband stations from the Basuyau et al, 2010;Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

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Upper mantle structure of the southern Arabian margin: Insights from teleseismic tomography

Korostelev¹,

Leroy²,

Keir³

et al. 2015

Geosphere

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We image the lithospheric and upper asthenospheric structure beneath the central and eastern parts of the northern Gulf of Aden rifted passive conti nental margin with 59 broadband stations to evaluate the role of transform fault zones on the evolution of magmapoor continental margins. We used tele seismic tomography to compute a relative P wave velocity model in eastern Yemen and southern Oman down to 400 km depth. Our model shows low velocity anomalies located in the vicinities of five major fracture zones and regions of recent volcanism. These lowvelocity anomalies are likely caused by localized asthenospheric upwelling and partial melting, caused by smallscale convection promoted by gradients in the lithosphereasthenosphere bound ary topography near the fracture zones. In addition, low velocities underlie regions of elevated topography between major sedimentary basins. We sug gest that locally buoyant mantle creates uplift and dynamic topography on the rift margin that affects the course of seasonal rivers and the sedimentation at the mouth of those rivers. Our new P wave velocity model suggests that the dynamic topography and recent volcanism in the central and eastern Gulf of Aden could be due to smallscale convection at the edge of the Arabian plate and/or in the vicinity of fracture zones. GEOSPHERE

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Modeling 3‐D density distribution in the mantle from inversion of geoid anomalies: Application to the Yellowstone Province

Chaves

Ussami

2013

JGR Solid Earth

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[1] We developed a three-dimensional scheme to invert geoid anomalies aiming to map density variations in the mantle. Using an ellipsoidal-Earth approximation, the model space is represented by tesseroids. To assess the quality of the density models, the resolution and covariance matrices were computed. From a synthetic geoid anomaly caused by a plume tail with Gaussian noise added, the inversion code was able to recover a plausible solution about the density contrast and geometry when it is compared to the synthetic model. To test the inversion algorithm in a natural case study, geoid anomalies from the Yellowstone Province (YP) were inverted. From the Earth Gravitational Model 2008 expanded up to degree 2160, lower crust-and mantle-related negative geoid anomalies with amplitude of approximately 70 m were obtained after removing long-wavelength components (>5400 km) and crustal effects. We estimated three density models for the YP. The first model, the EDM-1 (estimated density model), uses a starting model with density contrast equal to 0. The other two models, the EDM-2 and EDM-3, use an initial density derived from two S-velocity models for the western United States, the Dynamic North America Models of S Waves by Obrebsky et al. (2011) and the Northwestern United States Teleseismic Tomography of S Waves (NWUS11-S) by James et al. (2011). In these three models, a lower and an upper bound for the density solution was also imposed as a priori information. Regardless of the initial constraints, the inversion of the residual geoid indicates that the lower crust and the upper mantle of the YP have a predominantly negative density contrast (~À50 kg/m 3 ) relative to the surrounding mantle. This solution reveals that the density contrast extends at least to 660 km depth. Regional correlation analysis between the EDM-1 and NWUS11-S indicates an anticorrelation (coefficient of~À0.7) at 400 km depth. Our study suggests that the mantle density derived from the inversion of geoid could be integrated with seismic velocity models to image mantle anomalous features beyond the depth limit of investigation achieved combining gravity and seismic tomography.

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Evidence of partial melting beneath a continental margin: case of Dhofar, in the Northeast Gulf of Aden (Sultanate of Oman)

Cited by 28 publications

References 59 publications

Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea–Gulf of Aden conjugate margins

Architecture of rifted continental margins and break-up evolution: insights from the South Atlantic, North Atlantic and Red Sea–Gulf of Aden conjugate margins

Upper mantle structure of the southern Arabian margin: Insights from teleseismic tomography

Modeling 3‐D density distribution in the mantle from inversion of geoid anomalies: Application to the Yellowstone Province

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