The Upper Cretaceous - Lower Tertiary marine to continental transition in the Bagua basin, northern Peru - Paleontology, biostratigraphy, radiometry, correlations

Mourier, Thomas; Bengtson, Peter; Bonhomme, Michel; Buge, Emile; Cappettta, Henri; Crochet, Jean-Yves; Feist, Monique; Hirsch, Karl F.; Jaillard, Étienne; Laubacher, Gérard; Lefranc, J.; Moullade, Michel; Noblet, Christophe; Pons, Denise; Rey, Jacques; Sigé, Bernard; Tambareau, Yvette; Taquet, Philippe

doi:10.1127/nos/19/1988/143

Cited by 42 publications

(23 citation statements)

References 7 publications

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“…Pons (1988) reported on a diverse Colombian macro-and micro-fossil flora from the Eastern Cordillera of Colombia, but almost no macrofossils were placed in modern angiosperm orders. Pollen similar to the legume genus Dinizia has been reported from the Maestrichtian (Caccavari 1996) of Brazil, and wood and fruit samples with probable affinity to Lecythidaceae, Bombacaceae and Palmae were reported from Colombia (Huertas 1969), Peru (Mourier et al 1992) and Brazil (Maury 1930;Duarte & Japiassú 1971). One of the very few Maestrichtian leaf floras known is from Colombia (Huertas 1960(Huertas , 1969Romero 1986), from which plants with…”

Section: Cretaceous Record Of Tropicalmentioning

confidence: 99%

South American palaeobotany and the origins of neotropical rainforests

Burnham

Johnson

2004

Phil. Trans. R. Soc. Lond. B

237

168

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Extant neotropical rainforest biomes are characterized by a high diversity and abundance of angiosperm trees and vines, high proportions of entire-margined leaves, high proportions of large leaves (larger than 4500 mm 2 ), high abundance of drip tips and a suite of characteristic dominant families: Sapotaceae, Lauraceae, Leguminosae (Fabaceae), Melastomataceae and Palmae (Arecaceae). Our aim is to define parameters of extant rainforests that will allow their recognition in the fossil record of South America and to evaluate all known South American plant fossil assemblages for first evidence and continued presence of those parameters. We ask when did these critical rainforest characters arise? When did vegetative parameters reach the level of abundance that we see in neotropical forests? Also, when do specific lineages become common in neotropical forests?Our review indicates that evidence of neotropical rainforest is exceedingly rare and equivocal before the Palaeocene. Even in the Palaeocene, the only evidence for tropical rainforest in South America is the appearance of moderately high pollen diversity. By contrast, North American sites provide evidence that rainforest leaf physiognomy was established early in the Palaeocene. By the Eocene in South America, several lines of evidence suggest that neotropical rainforests were diverse, physiognomically recognizable as rainforest and taxonomically allied to modern neotropical rainforests. A mismatch of evidence regarding the age of origin between sites of palaeobotanical high diversity and sites of predicted tropical climates should be reconciled with intensified collecting efforts in South America. We identify several lines of promising research that will help to coalesce previously disparate approaches to the origin, longevity and maintenance of high diversity floras of South America.

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Section: Cretaceous Record Of Tropicalmentioning

confidence: 99%

South American palaeobotany and the origins of neotropical rainforests

Burnham

Johnson

2004

Phil. Trans. R. Soc. Lond. B

237

168

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“…The Quilque Formation is a ~400‐m‐thick coarsening‐upward succession sitting disconformably above the Upper Cretaceous siliciclastic and terrestrial carbonate Puquín Formation (Figure a). Basal mudstones contain abundant 0.1‐ to 0.3‐mm‐diameter charophyte fossils (terrestrial algae), identified as Nitellopsis supraplana sulcate (based on visual comparison to Antoine et al, ), which suggests a Paleocene‐early Eocene stratigraphic age (Mourier et al, ). This is consistent with previous interpretations of Paleocene age also based on charophyte fossils ( Lamprothamnium , Carlotto, ), and a new detrital zircon U‐Pb maximum depositional age of 57.9 ± 5.5 Ma (see section 4).…”

Section: Resultsmentioning

confidence: 99%

Peruvian Altiplano Stratigraphy Highlights Along‐Strike Variability in Foreland Basin Evolution of the Cenozoic Central Andes

et al. 2018

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Retroarc foreland basins in the Andean plateau contain critical information on geodynamic processes driving plateau development by providing a record of exhumation and sediment sourcing, as well as the timing, location, and magnitude of basin subsidence. However, this record is incomplete along orogenic strike and particularly limited in southern Peru. We measured~6,200 m of nonmarine clastic strata in the northern Peruvian Altiplano, documented through lithofacies characterization and paleocurrent analysis, conglomerate clast counts, sandstone petrography, and detrital zircon U-Pb geochronology; for the latter we employ quantitative detrital zircon interpretation methods including multidimensional scaling, mixture modeling, and quantification of zircon roundness. Results show dominant sediment sourcing from the Western Cordillera and/or western Altiplano. Sediment accumulation rates define an upward-convex Paleogene subsidence profile consistent with deposition in a northeastward-migrating flexural foreland basin system, with lithospheric loading from an increasingly proximal Western Cordilleran hinterland. Basin deposition following a 23-9 Ma angular unconformity shows a marked increase in sediment accumulation rates >800 m/Myr, interpreted as a departure from flexural subsidence. Results highlight along-strike variability in Andean foreland basin evolution, as foredeep deposits are thicker, and the onset of rapid sediment accumulation occurs earlier in southern Peru compared to Bolivia and Argentina. Results tentatively support models of orogenic cyclicity and reveal that episodes of high-flux magmatism in southern Peru are slightly out of phase with those documented in northwest Argentina, which may be controlled by preexisting Paleozoic-Mesozoic structural and stratigraphic fabrics and the rate of underthrusting of melt-fertile continental lower crust and mantle lithosphere.

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“…The stratigraphic succession of the Bagua Basin has been studied previously by Chacaltana et al (2011); Mourier et al (1988); Mourier et al (1986); Naeser et al (1991);and Salazar Díaz (1967); however, only one unpublished study reported detailed sedimentological descriptions and thickness information for Upper Cretaceous-Cenozoic formations (Baca Alvarez, 2004). The age of the Bagua succession has been calibrated on the basis of fossil content (Baca Alvarez, 2004;Mourier et al, 1986Mourier et al, , 1988) and a few radiometric dates (Mourier et al, 1988;Naeser et al, 1991). We carried out field work to refine the stratigraphic measurements, sedimentological descriptions, and age control for the Bagua Basin (Figures 3, 4, and S1).…”

Section: Cenozoic Stratigraphy and Age Constraintsmentioning

confidence: 93%

“…Discrepancies between radiometric ages led Naeser et al (1991) to present a critical review of the K/Ar ages from Mourier et al (1988), pointing out the caveats of K/Ar dating including multigrain analysis, detrital contamination, and low closure temperature. We follow Naeser et al (1991) and do not consider K/Ar ages from Mourier et al (1988) in our analysis. The MDAs obtained in this work are in general agreement with the fission track ages published by Naeser et al (1991).…”

Section: Cenozoic Stratigraphy and Age Constraintsmentioning

confidence: 99%

“…Moreover, it improves understanding of the diverse tectonic factors in this region, including the tectonic development of the North Andean Block (Chew et al, 2007(Chew et al, , 2008, the spatial transition from normal to flat subduction (Gutscher et al, 1999;Horton, 2018b), and variations in interseismic coupling along the subduction zone (Figure 1; Villegas-Lanza et al, 2016). Despite its regional significance, few studies have addressed the Bagua Basin and its long-lived uppermost Cretaceous-Cenozoic sedimentary record (Baca Alvarez, 2004;George et al, 2019;Mourier et al, 1986Mourier et al, , 1988Naeser et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Coupled Andean Growth and Foreland Basin Evolution, Campanian–Cenozoic Bagua Basin, Northern Peru

et al. 2020

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Cenozoic sedimentary rocks of the intermontane Bagua Basin record the Andean orogenic history of northern Peru at ~4–7°S. The northern Peruvian Andes define the northern termination of the Central Andes and are comprised of a narrow, low‐elevation orogen relative to the rest of the Central Andes. New stratigraphic and sedimentologic field observations, subsidence analysis, and detrital zircon provenance analysis enable reconstruction of the regional tectonic history. Late Cretaceous to Paleocene detrital zircon U‐Pb age spectra from the Fundo El Triunfo and Rentema formations reveal active volcanism in the Western Cordillera as early as ~80 Ma and early exhumation of Mesozoic rocks in a nascent Marañon Fold‐Thrust Belt. Eocene fluvial deposits of the Cajaruro Formation record a progressive increase in shortening and volcanism in the Western Cordillera. The upper Eocene–middle Miocene fluvial succession of the Sambimera Formation records deposition in a proximal foredeep setting. Sambimera deposits contain syndepositional detrital zircon U‐Pb age populations that reveal a major Cenozoic magmatic source in the west. An erosive boundary separates the Sambimera from the overlying San Antonio Formation. The San Antonio Formation was deposited in an intermontane basin associated with uplift of the Eastern Cordillera at these latitudes. These results highlight a foreland progression of fold‐thrust deformation, with shortening concentrated in the Western Cordillera from latest Cretaceous to middle Miocene time. We suggest that the late Miocene transition to intermontane deposition in the Bagua Basin marks initial exhumation during shortening of the Eastern Cordillera in northern Peru.

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The Upper Cretaceous - Lower Tertiary marine to continental transition in the Bagua basin, northern Peru - Paleontology, biostratigraphy, radiometry, correlations

Cited by 42 publications

References 7 publications

South American palaeobotany and the origins of neotropical rainforests

South American palaeobotany and the origins of neotropical rainforests

Peruvian Altiplano Stratigraphy Highlights Along‐Strike Variability in Foreland Basin Evolution of the Cenozoic Central Andes

Coupled Andean Growth and Foreland Basin Evolution, Campanian–Cenozoic Bagua Basin, Northern Peru

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