The Paleocene travertine system of the Itaboraí basin, Southeastern Brazil

Sant’anna, Lucy Gomes; Riccomini, Cláudio; Rodrigues-Francisco, B. H.; Sial, Alcídes N.; Carvalho, Marcelo de Araújo; Moura, Cândido Augusto Veloso

doi:10.1016/j.jsames.2004.08.005

Cited by 50 publications

(52 citation statements)

References 42 publications

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“…Although the origin of micrite is unclear, at least some parts may be microbially induced, as recorded in lake environments (Gierlowski‐Kordesch, ). In the Itaboraí Basin, South‐eastern Brazil, micritic travertines of Palaeocene age contain disseminated pyrite, minor amounts of detrital quartz, feldspar and scattered pebbles, which were attributed to the precipitation in small, shallow ponds under biotic mediation (Sant'Anna et al ., ).…”

Section: Facies Descriptionmentioning

confidence: 96%

Sedimentological and geochemical characteristics of a fluvial travertine: A case from the eastern Mediterranean region

et al. 2013

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A sedimentological and geochemical study was performed on the travertines in the southern part of the Uşak geothermal field, western Turkey, to assess the applicability of a fluvial tufa facies model in interpreting late Quaternary travertine deposits developed along the stream valleys that follow fault and fracture systems. Modern thermal (31 to 38°C) springs are found on the floor of the valley between 480 m and 520 m above sea‐level. The distribution and nature of travertine facies were determined from natural outcrops. Samples of the travertines and spring water were characterized using a range of geochemical and petrographic methods. Waterfall, slope and pool facies associations consist of various combinations of travertine facies and subordinate detrital facies. Waterfall and slope facies associations of the older deposits occur where the springs emerged onto a hillslope or topographic break. In contrast, the pool facies association developed in depressions or flat areas that were fed by thermal springs. The youngest generation (1·85 ka) precipitated at lower elevations than the older ones (147 to 153 ka). Stable carbon and oxygen isotope values of the Aksaz travertines range between +4·3‰ and +6·3‰ (Vienna Pee Dee Belemnite) and −12·6‰ and −7·2‰ (Vienna Pee Dee Belemnite), respectively. The high δ13C values suggest that the thermal waters were charged with isotopically heavy CO2 of deep origin. Based on palaeotemperature calculations, the temperatures of the palaeosprings are slightly higher (up to 44°C) than the present equivalents, but sometimes the temperature is lower, probably due to mixing with the stream water. Although the thermal waters occasionally are impeded by fluvial activity, travertine precipitation occurs in the protected parts of the Aksaz Stream valley. This contribution highlights the applicability of the fluvial facies model for tufa for the interpretation of travertine deposits worldwide.

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Section: Facies Descriptionmentioning

confidence: 96%

Sedimentological and geochemical characteristics of a fluvial travertine: A case from the eastern Mediterranean region

et al. 2013

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“…Distal environments encompass all of the deposits forming in low relief topography from near‐ambient water temperatures where hot ground water has been mixed with surface rain water. These settings, marshes (Guo & Riding, ), shallow lakes (Sant'Anna et al ., ) or alluvial plains (Brogi et al ., ), are typically transitional environments where travertine fabrics grade imperceptibly into tufa fabrics and biotic controls on depositional processes progressively increase (Rainey & Jones, ). Deposits are often dominated by lithoclastic material (often hillwash breccia), but coated grains, in situ coated macrophyte stems and subordinate, massive bedded layers of clotted peloidal micrite may develop.…”

Section: Depositional Environments and Morphologiesmentioning

confidence: 99%

Decoding tufa and travertine (fresh water carbonates) in the sedimentary record: The state of the art

2013

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Traditionally, fresh water carbonate research has focused on the sedimentology and palaeontology of ancient lacustrine deposits. Lithofacies in such low-energy deposits are typically fine-grained, developed uniformly in a generally concentric distribution ('bulls-eye' pattern) and are predictable even when preserved imperfectly. In contrast, because of their local lithofacies and palaeontological complexities, fluvial carbonates were either delegated to a status of 'minor geomorphological features' or barely considered prior to the 1970s. This viewpoint was based on the depositional record of fluvial and spring-fed fresh water carbonates, which were considered to be restricted generally to localized karstic areas. Such deposits are often preserved as scattered patches of ambient temperature tufa. Occasionally, however, in active tectonic areas, localized travertine deposits are also developed from deeply circulating hydrothermal waters. With a few exceptions (for example, basins with high subsidence rates or in arid climate zones), these fresh water carbonates are prone to erosion from continuing river incision and thus may not be preserved in the geological record. A partial record of fluvial and springdeposited carbonates is often preserved in Quaternary deposits, but the record in older deposits is typically fragmentary and often diagenetically modified. Yet once their unique facies architecture (and specialized nomenclature) is understood, these carbonates provide an important record of past sedimentological cycles of great value in palaeoenvironmental landscape modelling. The emphasis of modern research is to acquire information that explains how active systems function. In this respect, tufas reveal much of how carbonate precipitation is a shared product of physico-chemical and microbiological biomediation processes. Likewise, travertines not only show an intimate interrelation with active tectonism but also hold great potential as monitors of past volcanic carbon dioxide emissions. In addition, both tufas and travertines contain palynological records that can be used as proxy indicators of climate change. Perhaps no other field of sedimentology has witnessed more developments and applications over such a brief period of study.

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“…According to some authors [e.g., Almeida , 1976; Riccomini et al , 2004], these basins formed by rifting, whereas others [e.g., Cobbold et al , 2001; Cogné et al , 2012; Padilha et al , 1991] have favored a transtensional (pull‐apart) context. The basins are at least 48 ± 1 Ma old (from 40 Ar‐ 39 Ar dating of intercalated lavas in the Volta Redonda Basin [ Riccomini et al , 2004]), but could be as old as Palaeocene [ Cobbold et al , 2001; Cogné et al , 2012; Sant'Anna et al , 2004]. …”

Section: Geological Settingmentioning

confidence: 99%

Post‐breakup tectonics in southeast Brazil from thermochronological data and combined inverse‐forward thermal history modeling

Cogné¹,

Gallagher²,

Cobbold³

et al. 2012

J. Geophys. Res.

116

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[1] The continental margin of southeast Brazil is elevated. Onshore Tertiary basins and Late Cretaceous/Paleogene intrusions are good evidence for post breakup tectono-magmatic activity. To constrain the impact of post-rift reactivation on the geological history of the area, we carried out a new thermochronological study. Apatite fission track ages range from 60.7 AE 1.9 Ma to 129.3 AE 4.3 Ma, mean track lengths from 11.41 AE 0.23 mm to 14.31 AE 0.24 mm and a subset of the (U-Th)/He ages range from 45.1 AE 1.5 to 122.4 AE 2.5 Ma. Results of inverse thermal history modeling generally support the conclusions from an earlier study for a Late Cretaceous phase of cooling. Around the onshore Taubaté Basin, for a limited number of samples, the first detectable period of cooling occurred during the Early Tertiary. The inferred thermal histories for many samples also imply subsequent reheating followed by Neogene cooling. Given the uncertainty of the inversion results, we did deterministic forward modeling to assess the range of possibilities of this Tertiary part of the thermal history. The evidence for reheating seems to be robust around the Taubaté Basin, but elsewhere the data cannot discriminate between this and a less complex thermal history. However, forward modeling results and geological information support the conclusion that the whole area underwent cooling during the Neogene. The synchronicity of the cooling phases with Andean tectonics and those in NE Brazil leads us to assume a plate-wide compressional stress that reactivated inherited structures. The present-day topographic relief of the margin reflects a contribution from post-breakup reactivation and uplift.Citation: Cogné, N., K. Gallagher, P. R. Cobbold, C. Riccomini, and C. Gautheron (2012), Post-breakup tectonics in southeast Brazil from thermochronological data and combined inverse-forward thermal history modeling,

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The Paleocene travertine system of the Itaboraí basin, Southeastern Brazil

Cited by 50 publications

References 42 publications

Sedimentological and geochemical characteristics of a fluvial travertine: A case from the eastern Mediterranean region

Sedimentological and geochemical characteristics of a fluvial travertine: A case from the eastern Mediterranean region

Decoding tufa and travertine (fresh water carbonates) in the sedimentary record: The state of the art

Post‐breakup tectonics in southeast Brazil from thermochronological data and combined inverse‐forward thermal history modeling

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