Miocene Tholeiitic and Calk-Alkaline Magmatism From the Northern Colombian Andes – Implications for Magma Petrogenesis in the Northern Volcanic Zone

Weber, Marion; Duque-Trujillo, José; Hoyos, Susana; Cárdenas, Andrés; Tapias, Jorge Gómez; Wilson, Rob

doi:10.1130/abs/2018am-324534

Cited by 1 publication

(4 citation statements)

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“…Therefore, the emplacement of these magmatic intrusions requires a breakoff in the Caribbean slab east of the PCA at about 15 Ma. This interpretation is corroborated by the regional trend of Miocene magmatism related to Pacific plates subduction (Figures 8f and 8g) and additionally, by the adakitic signature of these Miocene bodies (Weber et al, 2020). The latter could be related to the subduction of the active Sandra spreading center and to the complicated Nazca plate geometry behind the CSP triple junction.…”

Section: Accretion Of the Panama-choco Arc (Pca) To Nwsasupporting

confidence: 64%

“…This condition could explain the weak nature of these velocity anomalies and the scarce seismicity east of the PCA (Figure 4b). Additionally, this interpretation is supported by the adakitic magmatic signature in eastern Panama (de Boer et al., 1988; Gutscher et al., 2000); the faster eastward motion of the Panama isthmus as compared to the Caribbean plate (as result of the Nazca slab pushing from below) (Figures 9a and 10g); the Miocene subduction‐related magmatism north of 5.5°N (Weber et al., 2020), and the geometrical origin of the Farallon plate boundary as an Aleutian type margin (Cardona et al., 2018).…”

Section: Discussionmentioning

confidence: 86%

“…Clear evidence that points to a slab breakoff beneath the NWSA margin is the development of Miocene arc‐related magmatism in close proximity to the suture zone between the PCA and SA (Figures 3b, 8g, and 10d). These magmatic intrusions, ranging in age from 15 to 7 Ma (e.g.,Leal‐Mejía et al., 2019), with heterogeneous compositions including tholeiitic, calc–alkaline, and shoshonitic signatures (Weber et al., 2020), have been regarded as originating from fluids from the Nazca slab (Wagner et al., 2017; Weber et al., 2020). Under the premise of an existing Caribbean slab (Figures S3f–S3h in Supporting Information ), however, this magmatism would not be possible, as the fluids rising from the Nazca plate would be stopped by the overlaying Caribbean slab (which may have been subducting shallower than 50 km) (Figures S3f–S3h in Supporting Information ).…”

Section: Discussionmentioning

confidence: 99%

“…We employ the paleogeographic reconstruction of the plate margins and the spatiotemporal distribution of Cenozoic arc magmatism. We used the recently published Cenozoic arc magmatism records along the Colombian margin (Barbosa‐Espitia et al., 2019; Cardona et al., 2018; Lara et al., 2013; Leal‐Mejía et al., 2019; Marín‐Cerón et al., 2019; Wagner et al., 2017; Weber et al., 2020), the Ecuadorian Andes (Schütte et al., 2010) and the Panamanian isthmus (Lissinna, 2005; Montes et al., 2012; Rooney et al., 2015; Wegner et al., 2011). The resulting geometric models were integrated with published evidence of deformation in the upper plate, which allowed us to identify possible correlations between the regional plate geodynamics and first‐order phases of deformation in the Northern Andes during the Cenozoic (Table S1 in Supporting Information ).…”

Section: Methodsmentioning

confidence: 99%

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Kinematics and Convergent Tectonics of the Northwestern South American Plate During the Cenozoic

González,

Oncken,

Faccenna

et al. 2023

Geochem Geophys Geosyst

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The interaction of the northern Nazca and southwestern Caribbean oceanic plates with northwestern South America (NWSA) and the collision of the Panama‐Choco arc (PCA) have significant implications on the evolution of the northern Andes. Based on a quantitative kinematic reconstruction of the Caribbean and Farallon/Farallon‐derived plates, we reconstructed the subducting geometries beneath NWSA and the PCA accretion to the continent. The persistent northeastward migration of the Caribbean plate relative to NWSA in Cenozoic time caused the continuous northward advance of the Farallon‐Caribbean plate boundary, which in turn resulted in its progressive concave trench bending against NWSA. The increasing complexity during the Paleogene included the onset of Caribbean shallow subduction, the PCA approaching the continent, and the forced shallow Farallon subduction that ended in the fragmentation of the Farallon Plate into the Nazca and Cocos plates and the Coiba and Malpelo microplates by the late Oligocene. The convergence tectonics after late Oligocene comprised the accretional process of the PCA to NWSA, which evolved from subduction erosion of the forearc to collisional tectonics by the middle Miocene, as well as changes of convergence angle and slab dip of the Farallon‐derived plates, and the attachment of the Coiba and Malpelo microplates to the Nazca plate around 9 Ma, resulting in a change of convergence directions. During the Pliocene, the Nazca slab broke at 5.5°N, shaping the modern configuration. Overall, the proposed reconstruction is supported by geophysical data and is well correlated with the magmatic and deformation history of the northern Andes.

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Section: Accretion Of the Panama-choco Arc (Pca) To Nwsasupporting

confidence: 64%