Crustal structure in the Falcón Basin area, northwestern Venezuela, from seismic and gravimetric evidence

Bezada, Maximiliano; Schmitz, Michael; Jácome, María I.; Rodríguez, Josmat; Audemard, Franck; Izarra, Carlos

doi:10.1016/j.jog.2007.11.002

Cited by 26 publications

(30 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The top of the slab has also been imaged from tomography studies (Van der Hilst and Mann 1994). An important crustal thinning is present in the area of the Falcón basin, where Moho depths are reduced by approximately 10 km (Bezada et al 2008). The 3-D model shows this feature (Figs.…”

Section: Model Sectionsmentioning

confidence: 80%

“…Schmitz et al (2008) interpreted this anomalous velocity as reworked lower crustal and upper mantle material associated with the plate interactions of the South American and the Caribbean plates. (2) In Western Venezuela, the Falcón Basin shows a remarkable crustal thinning from 35 to 27 km, which extends eastward into the Bonaire Basin (Bezada et al 2008).…”

Section: Constraintsmentioning

confidence: 98%

“…Vp: density conversion A review of previous density models of the region reveals several inconsistencies among densities and geometries of the proposed model (Bezada et al 2008;Chacín et al 2008;Jácome et al 2008;Magnani et al 2009;Rodriguez and Sousa 2003;Schmitz et al 2005). To avoid ambiguities, the density values used in the 3-D gravity modeling were initially assigned from predicted values that were calculated from the seismic velocity observations.…”

Section: Density Modelmentioning

confidence: 99%

See 2 more Smart Citations

A 3-D lithospheric model of the Caribbean-South American plate boundary

Sanchez

Götze

Schmitz

2010

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

A 3-D structural model of the Caribbean-South American plate boundary was constructed by gravity modeling. The model was constrained by four wide-angle seismic refraction sections, Moho depth estimations from receiver functions, and additionally seismological hypocenters, surface geology, and geodynamic information. Density values were calculated from empirical velocitydensity functions, and mineralogical-chemical composition considering specific P/T conditions. We tested different structural models for Western and Eastern Venezuela. In the final model, the fit of the measured and modeled gravity fields for a long Caribbean slab in Western Venezuela was better than the fit obtained for a short one. This interpretation is consistent with the constraining data. The slab is interpreted to extend further to the south beneath Northern Colombia and culminates in the area of the seismic cluster of the Bucaramanga nest. The modeling estimates a slab dip angle under Maracaibo and Mérida Andes of 15°, which increases to 32°below 100 km depth. The dip direction of approx. N150°E ± 5 increases lightly eastward. In Eastern Venezuela, considering its short wavelength, lineaments analyzed from gravity data (by curvature methods and Euler deconvolution) seem to be related to shallow structures and density contrast in the Serranía del Interior and not from a deep detached slab beneath the continental crust. It is deduced from modeling results that this slab configuration has a very small influence on the gravity field. The slab was modeled according to the subduction-transform propagation model with purely westward subduction and a slab break off along a vertical dip-slip tear through the lithosphere.

show abstract

Section: Model Sectionsmentioning

confidence: 80%

Section: Constraintsmentioning

confidence: 98%

Section: Density Modelmentioning

confidence: 99%

See 1 more Smart Citation

A 3-D lithospheric model of the Caribbean-South American plate boundary

Sanchez

Götze

Schmitz

2010

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Its sedimentary record, except for some unconformities of regional extent, was almost continuous from the late Eocene to the late Miocene (Audemard, 2001). Several studies have added significant information on the stratigraphy of the central region of the Falcó n Basin (e.g., Audemard, 2001;Bezada et al, 2007). In the area of the Mitare River, the stratotype comprises the following formations, from bottom to top: El Paraíso, Pecaya, Pedregoso, Agua Clara, Cerro Pelado, Querales, Socorro and Urumaco (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Assessment of the oil source-rock potential of the Pedregoso Formation (Early Miocene) in the Falcón Basin of northwestern Venezuela

Montero‐Serrano

Martínez

Riboulleau

et al. 2010

Marine and Petroleum Geology

View full text Add to dashboard Cite

“…• W profile, which indicates a crustal thickness of ∼27 km [58]. The crustal thickness beneath the Eastern Venezuela basin ranges from ∼50 to ∼40 km.…”

Section: Effective Elastic Thickness and Mohomentioning

confidence: 99%

New Bouguer Gravity Maps of Venezuela: Representation and Analysis of Free-Air and Bouguer Anomalies with Emphasis on Spectral Analyses and Elastic Thickness

Sanchez-Rojas

2012

International Journal of Geophysics

View full text Add to dashboard Cite

A new gravity data compilation for Venezuela was processed and homogenized. Gravity was measured in reference to the International Gravity Standardization Net 1971, and the complete Bouguer anomaly was calculated by using the Geodetic Reference System 1980 and 2.67 Mg/m 3 . A regional gravity map was computed by removing wavelengths higher than 200 km from the Bouguer anomaly. After the anomaly separation, regional and residual Bouguer gravity fields were then critically discussed in term of the regional tectonic features. Results were compared with the previous geological and tectonic information obtained from former studies. Gravity and topography data in the spectral domain were used to examine the elastic thickness and depths of the structures of the causative measured anomaly. According to the power spectrum analysis results of the gravity data, the averaged Moho depths for the massif, plains, and mountainous areas in Venezuela are 42, 35, and 40 km, respectively. The averaged admittance function computed from the topography and Free-Air anomaly profiles across Mérida Andes showed a good fit for a regional compensation model with an effective elastic thickness of 15 km.

show abstract

Crustal structure in the Falcón Basin area, northwestern Venezuela, from seismic and gravimetric evidence

Cited by 26 publications

References 23 publications

A 3-D lithospheric model of the Caribbean-South American plate boundary

A 3-D lithospheric model of the Caribbean-South American plate boundary

Assessment of the oil source-rock potential of the Pedregoso Formation (Early Miocene) in the Falcón Basin of northwestern Venezuela

New Bouguer Gravity Maps of Venezuela: Representation and Analysis of Free-Air and Bouguer Anomalies with Emphasis on Spectral Analyses and Elastic Thickness

Contact Info

Product

Resources

About