Controls on forearc basin formation and evolution: Insights from Oligocene to Recent tectono-stratigraphy of the Lower Magdalena Valley basin of northwest Colombia

Mora, J.A.; Oncken, Onno; Breton, Eline Le; Mora, Andrés; Veloza, Gabriel; Vélez, Vickye; Freitas, Mario de

doi:10.1016/j.marpetgeo.2018.06.032

Cited by 39 publications

(51 citation statements)

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“…Given the limited lateral extent of the first two depositional phases of the lower Nanaimo Group in the Comox Sub‐Basin, a progressive amalgamation of sub‐basins that overfilled to form a single basin may be a reasonable evolutionary model for accretionary forearc basins. Other studies demonstrate that initial sedimentation in forearc basins is dominated by basement structures which often enable the formation of separate sub‐basins (Le Roux & Elgueta, ; Moore, Curray, & Emmel, ; Mora et al, ; Xie & Heller, ), and this study reveals substantial topography on the basal nonconformity of the Comox Sub‐basin (Figure ). In oblique convergent margins like the Sumatra forearc, sub‐basin formation and segmentation is attributed to strike‐slip faulting (Izart, Kemal, & Malod, ).…”

Section: Discussionsupporting

confidence: 61%

“…Through this analysis, we identify multiple depositional phases and correlate chronostratigraphically related but sedimentologically dissimilar facies and facies associations. The complex stratigraphy and architecture of facies changes both vertically and laterally in the lower Nanaimo Group and across the Comox Sub‐Basin appear to be typical of ridged forearcs (Mora et al, ; Takano, ), and hence, the methodology employed herein can be applied in ridged forearcs globally.…”

Section: Discussionmentioning

confidence: 99%

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Initiation and early evolution of a forearc basin: Georgia Basin, Canada

et al. 2019

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The lower Nanaimo Group was deposited in the (forearc) Georgia Basin, Canada and records the basin's initiation and early depositional evolution. Nanaimo Group strata are subdivided into 11 lithostratigraphic units, which are identified based on lithology, paleontology, texture and position relative to both the basal nonconformity and to each other. Significant topography on the basal nonconformity, however, has resulted in assignment of lithostratigraphic units that are not time correlative, and hence, cannot reliably be used to accurately reconstruct basin evolution. Herein, we present a sequence stratigraphic framework for lower Nanaimo Group strata in the Comox Sub‐Basin (northern Georgia Basin) that integrates both facies analysis and maximum depositional ages (MDAs) derived from detrital zircon. This stratigraphic framework is used to define significant sub‐basin‐wide surfaces that bound depositional units and record the evolution of the basin during its early stages of development. Seven distinct depositional phases are identified in the lower 700 m of the lower Nanaimo Group. Depositional phases are separated by marine flooding surfaces, regressive surfaces, or disconformities. The overall stratigraphy reflects net transgression manifested as an upwards transition from braided fluvial conglomerates to marine mudstones. Transgression was interrupted by periods of shoreline progradation, and both facies analysis and MDAs reveal a disconformity in the lowermost part of the Nanaimo Group in the Comox Sub‐Basin. Stratigraphic reconstruction of the Comox Sub‐Basin reveals two dominant depocenters (along depositional strike) for coarse clastics (sandstones and conglomerates) during early development of the Georgia Basin. The development and position of these depocenters is attributed to subduction/tectonism driving both subsidence in the north‐northwest and uplift in the central Comox Sub‐Basin. Our work confirms that in its earliest stages of development, the Georgia Basin evolved from an underfilled, ridged forearc basin that experienced slow and stepwise drowning to a shoal‐water ridged forearc basin that experienced rapid subsidence. We also propose that the Georgia Basin is a reasonable analogue for ridged forearc basins globally, as many ridged forearcs record similar depositional histories during their early evolution.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Initiation and early evolution of a forearc basin: Georgia Basin, Canada

et al. 2019

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“…The Paleogene period in the northern Andes and the onshore Colombian Caribbean basins was characterized by an increase in morphotectonic activity (Van der Hammen, 1961;Restrepo-Moreno, 2009;Villagómez et al, 2011;Spikings et al, 2015;Restrepo-Moreno et al, 2019) that modified regional paleogeography, triggering the production and transport of detrital materials and the generation of synorogenic basins (Ayala et al, 2012;Mora-Bohórquez et al, 2017;. Sedimentary sequences in this region keep a record of uplift, exhumation, erosion, sediment production, and deposition in the northern Andes (Hernández and Jaramillo, 2009;Nie et al, 2012;Bernal-Olaya et al, 2015;Mora et al, 2018;Cardona et al, 2018). Additionally, some of these units have been the focus of research because the high number of oil and gas seeps reveals an active petroleum system (e.g., Barrero et al, 2007).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Currently, a widely accepted model posits that the SJFB basin originated as an accretionary prism that formed in the Late Cretaceous and was subsequently deformed during the Oligocene (Duque- Caro, 1972Caro, , 1980Dewey and Pindell, 1985;Toto and Kellogg, 1992;Guzmán et al, 2004;Cardona et al, 2012). This last model implies the accretion of oceanic terranes (Cardona et al, 2012;Mora-Bohórquez et al, 2017) and the formation of a forearc basin related to the SJFB and the Lower Magdalena Valley (LMV) Research Paper (Mantilla-Pimiento et al, 2009;Mora et al, 2018;Mora-Bohórquez et al, 2017).…”

Section: ■ Introductionmentioning

confidence: 99%

“…During the early to middle Eocene, the increase in morphotectonic activity generated another unconformity, which separates the San Cayetano Formation from the Chengue and Toluviejo Formations (Guzmán et al, 2004;. Sedimentation in the Oligocene-Miocene interval is characterized by thick successions of sandstones interlayered with mudrocks and some coal layers that belong to the Ciénaga de Oro Formation (Guzmán et al, 2004;Mora et al, 2018). During the Neogene tectonic inversion of the SJFB and the LMV, the sedimentary environments shifted from shallow marine (Tubará Formation) to continental (Sincelejo Formation) (Guzmán et al, 2004).…”

Section: ■ Introductionmentioning

confidence: 99%

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Provenance of Eocene–Oligocene sediments in the San Jacinto Fold Belt: Paleogeographic and geodynamic implications for the northern Andes and the southern Caribbean

et al. 2019

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Mesozoic and Cenozoic strata of the San Jacinto Fold Belt (Colombian Caribbean) provide insights about sedimentary environments and paleogeographic evolution in the transition between the northern Andes and the South Caribbean deformed belt. We report new provenance (conventional sandstone petrography, heavy mineral analysis, and detrital zircon U-Pb geochronology and typology) and micropaleontologic data (palynology, calcareous nannofossils, and foraminifera) in samples collected from the lower Eocene (San Cayetano Formation) and upper Eocene–Oligocene (Toluviejo and Ciénaga de Oro Formations) rocks in boreholes drilled by the Colombian Agencia Nacional de Hidrocarburos as well as from recently exposed Oligocene outcrops from the Ciénaga de Oro Formation. Sandstone petrography shows modal variations, with high feldspar content in the lower Eocene rocks and high quartz content in the Oligocene deposits. This shift in compositional maturity may be due to climatic variations, tectonic activity, and/or changes in source areas. Heavy mineral analyses indicate variations that suggest sources primarily related to felsic igneous and/or low-grade metamorphic and mafic and ultramafic rocks. Zircon U-Pb geochronology displays age populations mainly in the Late Cretaceous, Late Jurassic, Permian–Triassic, and Precambrian (ca. 900–1500 Ma). In addition, zircon typology analyses indicate that the igneous zircons came primarily from monzogranites and granodiorites. Finally, the micropaleontologic and sedimentary data sets indicate that the sediments were deposited in tropical coastal and shallow marine environments. The sediments were transported by short rivers from the crystalline massifs of the Lower Magdalena Valley and the northern Central Cordillera basements, while distal transport of sediments may have occurred along longer rivers, which brought sediments from southern regions located between the Central and Western Cordilleras.

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Mountains and Plunging Plates: Subduction Zones

Neukirchen¹

2022

The Formation of Mountains

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Controls on forearc basin formation and evolution: Insights from Oligocene to Recent tectono-stratigraphy of the Lower Magdalena Valley basin of northwest Colombia

Cited by 39 publications

References 55 publications

Initiation and early evolution of a forearc basin: Georgia Basin, Canada

Initiation and early evolution of a forearc basin: Georgia Basin, Canada

Provenance of Eocene–Oligocene sediments in the San Jacinto Fold Belt: Paleogeographic and geodynamic implications for the northern Andes and the southern Caribbean

Mountains and Plunging Plates: Subduction Zones

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