Moho depth map of northern Venezuela based on wide-angle seismic studies

Schmitz, Michael; Ramírez, Keyla; Mazuera, Fernando; Ávila, Jesús Guadalupe Arreola; Yegres, Luis; Bezada, Maximiliano; Levander, A.

doi:10.1016/j.jsames.2020.103088

Cited by 7 publications

(5 citation statements)

References 25 publications

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“…8; stations STPC and PRPC) ranging from 45 to 50 km, which agrees with the previous work of Niu et al (2007). However, we observe an anomalously thickened crust of up to 50 km beneath the southeastern Orinoco River region (stations PRPC and PAPC) which is thicker than the ∼ 46 km reported by Schmitz et al (2021). Discrepancies between active and passive seismic observations are not uncommon (e.g., Niu et al, 2007) and arise from the sensitivity and resolution of different techniques.…”

Section: Receiver Functions and Moho Depth Estimationsupporting

confidence: 90%

“…Overall, the receiver functions obtained from the OBS stations deployed in the Venezuela Basin and the land station in Margarita Island are of poor quality, so we ensure that only the most robust RFs in the inversion are used. Despite limited data, we estimate Moho depths for this area that are consistent with expected depths, which range from 20 to 32 km according to Niu et al (2007) and around 25 to 35 km according to Schmitz et al (2021), and we resolve a shallower Moho (< 20 km) beneath the northwestern coast. We also find that the Moho depth around Margarita Island increases to approximately 40 km.…”

Section: Receiver Functions and Moho Depth Estimationsupporting

confidence: 73%

“…Through cross-correlating 1.5 years of data, we extract 6 to 32 s period fundamentalmode Rayleigh and Love waves recorded at 38 broadband stations. The results are discussed with reference to previous studies (Niu et al, 2007;Schmitz et al, 2008;Miller et al, 2009;Bezada et al, 2010;Arnaiz-Rodríguez et al, 2021;Schmitz et al, 2021) and how our findings enable us to characterize known tectonic features as well as obtain new information.…”

Section: Introductionmentioning

confidence: 56%

“…7a) and V p /V s maps (Fig. 7b), allow us to image the region in a clearer way than in previous studies (e.g., Niu et al, 2007;Schmitz et al, 2008;Miller et al, 2009;Bezada et al, 2010;Clark et al, 2008;Arnaiz-Rodríguez et al, 2021;Schmitz et al, 2021). For the first time, we image the upper lithosphere using a joint inversion of dispersion measurements and RFs with a robust non-linear inversion.…”

Section: Discussionmentioning

confidence: 98%

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Upper-lithospheric structure of northeastern Venezuela from joint inversion of surface-wave dispersion and receiver functions

et al. 2022

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Abstract. We use 1.5 years of continuous recordings from an amphibious seismic network deployment in the region of northeastern South America and the southeastern Caribbean to study the crustal and uppermost mantle structure through a joint inversion of surface-wave dispersion curves determined from ambient seismic noise and receiver functions. The availability of both ocean bottom seismometers (OBSs) and land stations makes this experiment ideal to determine the best processing methods to extract reliable empirical Green's functions (EGFs) and construct a 3D shear velocity model. Results show EGFs with high signal-to-noise ratio for land–land, land–OBS and OBS–OBS paths from a variety of stacking methods. Using the EGF estimates, we measure phase and group velocity dispersion curves for Rayleigh and Love waves. We complement these observations with receiver functions, which allow us to perform an H-k analysis to obtain Moho depth estimates across the study area. The measured dispersion curves and receiver functions are used in a Bayesian joint inversion to retrieve a series of 1D shear-wave velocity models, which are then interpolated to build a 3D model of the region. Our results display clear contrasts in the oceanic region across the border of the San Sebastian–El Pilar strike-slip fault system as well as a high-velocity region that corresponds well with the continental craton of southeastern Venezuela. We resolve known geological features in our new model, including the Espino Graben and the Guiana Shield provinces, and provide new information about their crustal structures. Furthermore, we image the difference in the crust beneath the Maturín and Guárico sub-basins.

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Section: Receiver Functions and Moho Depth Estimationsupporting

confidence: 90%

Section: Receiver Functions and Moho Depth Estimationsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 98%

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Upper-lithospheric structure of northeastern Venezuela from joint inversion of surface-wave dispersion and receiver functions

et al. 2022

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“…Orogen‐scale changes in crustal thickness (up to 40 km) have been documented in several orogens such as the Himalayas, the Central Andes, and Baja California, as a result of major collisional events, crust delamination, and continental extension, respectively (Chen et al., 2020; Priestley et al., 2019; Schmitz et al., 2021). We propose that the combination of a prior thickened crust, local crustal extension, and lithospheric dripping in a scenario of strike‐slip tectonics may be responsible for the coexistence of normal and thick continental crust between 62 and 50 Ma in the Northern Andes.…”

Section: Discussionmentioning

confidence: 99%

Diverse Magmatic Evolutionary Trends of the Northern Andes Unraveled by Paleocene to Early Eocene Detrital Zircon Geochemistry

Jaramillo

Zapata

Carvalho

et al. 2022

Geochem Geophys Geosyst

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The Paleocene‐early Eocene continental magmatic arc (PECMA) in the Northern Andes is an example of arc magmatism following a major collisional event. This arc formed after the arc‐continent collision between the Caribbean Plate and the South American continental margin at ca. 72 Ma. We used detrital zircon LA‐ICP‐MS and CA‐ID‐TIMS geochronology and geochemistry to complement the limited plutonic record of the PECMA and better characterize the PECMA's magmatic evolution. Zircon geochronology and their respective trace element geochemistry were analyzed from Paleocene‐early Eocene strata of the Bogotá Formation in the foreland region. Our results show that after the collision of the Caribbean Plate, the magmas in the PECMA differentiated under a thick continental crust with limited subduction input at ca. 66 Ma. By 62–50 Ma, scattered patterns of Hf, U, U/Yb, and Yb/Gd ratios in detrital zircons suggest the existence of contrasting magmatic inputs attributed to different depths of crustal fractionation, varied temperatures of crystallization, and significant mantle and subduction inputs. These diverse magmatic patterns reflect the evolution of the continental crust. We proposed that oblique convergence and strike‐slip tectonics favored contrasting crustal architectures along the continental margin while local lithosphere dripping from a previously thickened crust promoted the formation of hot magmas under a thick continental crust.

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Lesser Antilles slab reconstruction reveals lateral slab transport under the Caribbean since 50 Ma

Chen,

Wu,

Goes

2024

Earth and Planetary Science Letters

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Moho depth map of northern Venezuela based on wide-angle seismic studies

Cited by 7 publications

References 25 publications

Upper-lithospheric structure of northeastern Venezuela from joint inversion of surface-wave dispersion and receiver functions

Upper-lithospheric structure of northeastern Venezuela from joint inversion of surface-wave dispersion and receiver functions

Diverse Magmatic Evolutionary Trends of the Northern Andes Unraveled by Paleocene to Early Eocene Detrital Zircon Geochemistry

Lesser Antilles slab reconstruction reveals lateral slab transport under the Caribbean since 50 Ma

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