Cenozoic Geologic Evolution of the Southern Tumaco Forearc Basin (Sw Colombian Pacific)

Pardo-Trujillo, Andrés; Echeverri, Sebastián; Borrero, Carlos; Arenas, Alejandro Arango; Vallejo, Felipe García; Trejos, Raúl; Plata, Ángelo; Flores, José-Abel; Cardona, A.; Restrepo-Moreno, Sergio A.; Barbosa-Espitia, Ángel A.; Murcia, Hugo; Giraldo, C.; Celis, Sergio A.; Osorio, Julialba Ángel; Lopez, Sergio Adrian

doi:10.1130/abs/2018am-324877

Cited by 4 publications

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“…The sedimentary and volcanic fragments can be related to the Diabásico and Dagua Groups, or alternatively to the Quebradagrande Complex (Maya & González, 1995), which crop out in the Western and Central Cordilleras, respectively (Figure 1; Gómez et al, 2015a). Pardo-Trujillo et al (2020) mentioned that some parts of the Western Cordillera emerged during the early -middle Miocene based on petrographic and detrital zircon evidence in the neighboring Tumaco Basin (Figure 1). This result is consistent with a sedimentary and volcanic source located to the west of the basin.…”

Section: Discussionmentioning

confidence: 99%

“…The collision migrated from Ecuador to the N of Antioquia (Colombia) during the Late Cretaceous -Paleocene (Barrero et al, 2006;Kerr et al, 1997;Moreno-Sánchez & Pardo-Trujillo, 2003;Pindell & Kennan, 2009;Villagómez et al, 2011). Currently, the Western Cordillera is composed of plateau basalts and Upper Cretaceous sedimentary deposits (Pardo-Trujillo et al, 2002, 2020, with mylonitic deformation in some cases (Nivia, 2001). The plateau sequences are intruded by Paleogene -Neogene tonalitic plutons (Gómez et al, 2015b).…”

Section: Geological Frameworkmentioning

confidence: 99%

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Chapter 13

SGC¹

2019

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The sedimentary rocks of the Patía Sub-basin (SW Colombia) record the Cenozoic geologic evolution of western Colombia from the Paleogene to the Holocene. In this research, we report a new Miocene stratigraphic unit near Mercaderes town (Cauca Department). A 563 m-thick sequence is described in detail and divided from bottom to top into three lithological assemblages. (I) The upper segment of the conglomeratic member of the Esmita Formation is formed by 33 m-thick beds of clast-supported lithic conglomerates interbedded with lenticular litharenites, with trough and planar cross-bedding. They are interpreted as braided river deposits. (II) The Morales Formation, which is defined in this work, presents 470 m thick composed mainly of parallel laminated gray-black mudstones interbedded with thin sandstone beds, with parallel and ripple laminations, graded bedding, and soft-sediment deformation structures. Plant fragments, pollen, and spores are common. Towards the top, sandstone and polymictic conglomerate beds increase. They are interpreted as lake, marsh, and crevasse splay deposits adjacent to fluvial channels. (III) The bottom of the Galeón Formation is composed by 7 m thick of sandstones and conglomerates rich in volcanic fragments accumulated in a fluvial environment with simultaneous volcanic activity.The petrographic study (conventional and heavy minerals) identifies mainly litharenites and feldspathic litharenites, whose fragments suggest igneous (volcanic and plutonic), sedimentary (mudstones and sandstones), and metamorphic (high-pressure metamorphic rocks and graphitic schists) sources, which are correlated with the basements exposed at the present in the Central and Western Cordilleras.We review a volcaniclastic sandstone obtained from the bottom of the Galeón Formation that provides the youngest population of U/Pb ages in detrital zircons of ca. 15.4 Ma, interpreted as the depositional age. The sudden increase in volcanic components allows us to interpret this time as the onset of strong volcanism in the basin, which continues currently in the Central Cordillera. This age and new palynological studies suggest a Burdigalian -early Langhian (ca. 19-15.4 Ma) age for the Morales Formation, which improves the chronostratigraphy of the region. Lower Miocene mud-dominated successions have been described in different basins of Colombia (the Cauca-Patía, Neogene Supplementary Information: S: https://www2.sgc.gov.co/ LibroGeologiaColombia/tgc/ sgcpubesp37201913s.pdf 396 GALLEGO-RÍOS et al.Middle and Upper Magdalena, Llanos, and Caribbean Basins) and can be related to a regional period of tectonically induced accommodation.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Frameworkmentioning

confidence: 99%

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2019

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“…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 ). These deformation episodes are based on recently published interpretations for the Northern Andes (e.g., Bayona et al., 2013; Caballero et al., 2013; Horton et al., 2015; León et al., 2018; Montes et al., 2012; Mora, Blanco, et al., 2013; Mora, Reyes‐Harker, et al., 2013; Mora et al., 2010; Mora‐Bohórquez, Ibánez‐Mejia, et al., 2017; Moreno et al., 2013; Pardo‐Trujillo et al., 2020; Parra et al., 2009; Reyes‐Harker et al., 2015; Silva et al., 2013; Villagomez & Spikings, 2013) and eastern Panama (Barat et al., 2014; Montes et al., 2012). Due to the complex interaction between the subducting Caribbean and Farallon/Nazca plates throughout the Cenozoic, the geometrical restoration of these slabs requires a three‐dimensional approach.…”

Section: Methodsmentioning

confidence: 99%

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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“…These deformation episodes are based on recently published interpretations for the Northern Andes (e.g. Parra et al, 2009;Mora et al, 2010;Caballero et al, 2013;Mora et al 2013a;Mora et al 2013b;Moreno et al, 2013;Montes et al, 2012;Bayona et al, 2013;Villagómez and Spikings, 2013;Horton et al, 2015;Reyes-Harker et al, 2015;Mora-Bohórquez et al, 2017a;León et al, 2018;Pardo-Trujillo et al, 2020) and eastern Panama (Montes et al, 2012;Barat et al, 2014). Due to the complex interaction between the subducting Caribbean and Farallon/Nazca plates throughout the Cenozoic, the geometrical restoration of these slabs requires a three-dimensional approach.…”

Section: Upper Plate Record and Geometrical Reconstructionmentioning

confidence: 98%

Kinematics and Convergent Tectonics of the Northwestern South American Plate during the Cenozoic.

Afanador

Oncken

Faccenna

et al. 2022

Preprint

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The interaction of the northern Nazca and southwestern Caribbean oceanic plates with South America, and the collision of the Panama-Choco arc have significant implications on the evolution of the northern Andes. We integrate an alternative interpretation of the Nazca and Caribbean kinematics with the magmatic and deformation history in the region. The northeastward migration of the Caribbean plate caused a progressive change in the geometry of the subducting Farallon plate, causing flat-slab subduction throughout the late Eocene-late Oligocene, inhibition of magmatism and eastward migration of the Andean deformation. Meanwhile, the Paleocene-Eocene highly oblique convergence of the Caribbean plate against South America changed by the mid-Eocene, when the Caribbean plate began to migrate in an easterly direction. These events and the late Oligocene breakup of the Farallon plate, prompted a Miocene plate reorganization, with further plate fragmentation, changes in convergence obliquity, steepening of the subducting slabs and renewal of magmatism. This tectonics was complicated by the accretion of the Panama-Choco arc to South America, which was characterized by early Miocene subduction erosion of the forearc and trench advance, followed by breakoff of the subducting slab east of Panama and collisional tectonics from the middle Miocene. By 9 Ma the Coiba and Malpelo microplates were attached to the Nazca plate, resulting in an abrupt change in convergence directions, that correlates with the main pulse of Andean orogeny. During the late Pliocene, the Nazca slab broke, triggering the modern volcanism south of 5.5º N. Seismicity data and tomography support the proposed reconstruction.

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Cenozoic Geologic Evolution of the Southern Tumaco Forearc Basin (Sw Colombian Pacific)

Cited by 4 publications

References 0 publications

Chapter 13

Chapter 13

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

Kinematics and Convergent Tectonics of the Northwestern South American Plate during the Cenozoic.

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