Petrology and provenance of the Toro Negro Formation (Neogene) of the Vinchina broken-foreland basin (Central Andes of Argentina)

Ciccioli, Patricia L.; Marenssi, Sergio A.; Limarino, Carlos Óscar

doi:10.1016/j.jsames.2013.10.003

Cited by 16 publications

(34 citation statements)

References 33 publications

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“…We also combine existing petrographic and clast-count data with U-Pb dating of detrital zircons from eight sites to better constrain provenance changes. These results demonstrate that the Toro Negro Formation is somewhat younger than previously thought, they define four-fold changes in sediment-accumulation rates, and they support the conclusions of Ciccioli et al (2014a) thatthese sediments are derived primarily from the north and west with only minor changes in provenance over time.…”

Section: Introductionsupporting

confidence: 85%

“…The overlying Toro Negro Formation (~2500 m thick, Turner, 1964) isdivided into an upper and lower member (Ramos, 1970), further subdivided into three depositional sequences, I, II, and III, which are henceforth referred to as DSI, DSII, and DSIII (Ciccioli et al, 2014a). The Upper Member is equivalent to DSIII and the Lower Member is split between DSI and II (Fig.…”

Section: Previous Work 31 Stratigraphy Of the Vinchinadepocentermentioning

confidence: 99%

“…The Vinchinadepocenter also sits ~50 km north of a major basement structural lineament known as the Valle Fértil lineament, which is interpreted to be an important basement structure whose Miocene reactivation exerted a strong control on partitioning of the Bermejo Basin (Ciccioli et al, 2011(Ciccioli et al, , 2013a. The Toro Negro Formation is thuswell situated to recordboth uplift of basement blocks in theWestern SierrasPampeanas, as well asthrust activity in the northern Precordillera (Ciccioli, 2008;Ciccioli et al, 2014a).…”

Section: Introductionmentioning

confidence: 99%

“…The sedimentology of the Vinchinadepocenter has been well studied over the past 10 years (e.g. Tripaldi et al, 2001;Limarino et al, 2001;Ciccioli, 2008;Ciccioli and Marenssi, 2012;Ciccioli et al, 2011Ciccioli et al, , 2013bCiccioli et al, , 2014aMarenssi et al, 2015).In particular, the modal composition of sandstones and conglomerates has proven an effective means to establish source areas and to explorethe relation between shifts in compositional framework and changes in watershed configuration (Ciccioli, 2008;Ciccioli et al, 2014a). Sandstone composition does not, however, depend exclusively on the source rocks: it may be affected by the physiography and chemical weathering in the source area, by reworking and abrasion of the sediments during transportation and sedimentation, by recycling of older sediments, and by diagenetic effects (Amorosi and Zuffa, 2011;Dickinson and Suczek, 1979;Espejo and Lopez-Gamundi, 1994).…”

Section: Introductionmentioning

confidence: 99%

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U-Pb ages of detrital and volcanic zircons of the Toro Negro Formation, northwestern Argentina: Age, provenance and sedimentation rates

Amidon

Ciccioli

Marenssi

et al. 2016

Journal of South American Earth Sciences

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The Toro Negro Formation is a foreland sequence in western La Rioja province, Argentina, which records the late-stage tectonic evolution of the Vinchina Basin. Together with the underlying VinchinaFormation, these two units represent one of the thickest and longest continually exposed foreland sections in northwest Argentina. The Vinchina basin is uniquely situated between the Toro Negro and Umango blocks of the Western Sierra Pampeanas to the north and south, the Precordillera to the west, and the Sierra de Famatina to the east. New U-Pb dating of volcanic tephra providesimproved age constraints on the pace of sedimentation, and U-Pb ages of detrital zircons serve to strengthen existing provenance interpretations. We show that deposition of the Toro Negro Formation spans roughly 6.9 to 2.3 Ma: Late Miocene to Early Pleistocene. A high-relief, erosional unconformity with the underlying VinchinaFormation developed sometime between 9.3-6.9 Ma, although stratigraphic considerations suggest it spanned only the later part of this time interval (perhaps 7.5-6.9 Ma). Above this unconformity, undecompactedsedimentation rates are remarkably high at ~ 1.2 mm/yr, slowing to ~ 0.3 mm/yrafter ~6 Ma.An unconformity in the upper part of the section is constrained to occur sometime between 5.0-3.0 Ma, probably beginning not long after 5.0 Ma. The timing of both unconformities broadly matches the timing of inferred tectonic events in the Sierra Famatina ~50 km to the east, the Fiambalá basin to the north, and the Bermejo basin to the south, suggesting they may record regional tectonism at these times. Provenance interpretations of detrital zircon spectra are consistent with previous interpretations based on sediment petrography. They show that provenance did not change significantly during the course of Toro Negro deposition, precluding major tectonically-induced drainage reorganization events. Sediments were derived primarily from the north (Toro Negro Block) and west (Precordillera). The data are consistent with a subtle increase in sediment supply from the Precordillera beginning around 6.5 Ma.

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Section: Introductionsupporting

confidence: 85%

Section: Previous Work 31 Stratigraphy Of the Vinchinadepocentermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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U-Pb ages of detrital and volcanic zircons of the Toro Negro Formation, northwestern Argentina: Age, provenance and sedimentation rates

Amidon

Ciccioli

Marenssi

et al. 2016

Journal of South American Earth Sciences

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“…). Sedimentation occurred between the Early Miocene and Pliocene (Ciccioli et al ., , ,b; Collo et al ., and references therein). Magnetostratigraphic studies (Reynolds et al ., ; Re & Barredo, ) tied to zircon fission track ages on tuff levels (Tabbutt, ), as well as recent U–Pb chronology (Dávila et al ., ; Collo et al ., , ; Ciccioli et al ., , ) constrain the deposition of sediments to between ca .…”

Section: Geology Of the Vinchina And Bermejo Basinsmentioning

confidence: 99%

Isotopic and thermochronologic evidence of extremely cold lithosphere associated with a slab flattening in the Central Andes of Argentina

et al. 2015

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We present mineralogic, isotopic and thermochronologic analyses on psammopelitic and tuffaceous levels from the Bermejo and Vinchina basins -both foreland depocentres of the Central Andes of Argentina -that define a low-temperature regime for the crust akin to a slab shallowing and flattening process. The contents of illite in illite/smectite interstratified (I/S) show a progressive illitization into the deeper parts of both basins. The distribution of I/S is compatible with theoretical simulations and predicted heat flow values of ca. 26 mW m À2 in the 8-3.4 Ma interval for the Vinchina Basin and ca. 42 mW m À2 since 9 Ma for the Bermejo Basin. The latter shows heat flow values that are comparable to those reported by magnetotelluric analysis (36-40 mW m À2 ) in agreement with previously published heat flow calculations along the modern Andean foreland. The Rb-Sr isochrones in psammopelites (<2 lm fractions) show ages between 125 and 165 Ma, whereas the K-Ar ages decrease as the grain size is smaller (136-224 Ma for 1-2 lm, 112-159 Ma for 0.2-1 lm, 76-116 Ma for <0.2 l and 39.3-42 Ma for <0.1 lm). These ages are significantly older than the sedimentation in the basins (ca. 16 Ma for the Vinchina Basin; U-Pb age), and can be explained by the presence of a significant amount of detrital components, mainly illite, even in the finer fractions. The preservation of detrital ages is consistent with the shallow diagenesis related to a low-temperature regime, proposed here for the basins. Younger K-Ar ages (21.3-12 Ma) were obtained for a basal tuffaceous level. Clay mineralogy and R0 ordering in the deepest part of the Vinchina Basin, together with the evolution model of I/S with depth, suggest that the burial temperatures would have not exceeded ca. 100°C in agreement with (U-Th)/He analyses performed on apatite extracted from two tuffaceous units. Thermal indicators from both studied basins confirm the existence of a low-temperature regime during flat subduction.

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Fluvial-aeolian interaction deposits in the Andean Foreland basin (Northwest Argentina): Architecture and facies model

et al. 2022

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Petrology and provenance of the Toro Negro Formation (Neogene) of the Vinchina broken-foreland basin (Central Andes of Argentina)

Cited by 16 publications

References 33 publications

U-Pb ages of detrital and volcanic zircons of the Toro Negro Formation, northwestern Argentina: Age, provenance and sedimentation rates

U-Pb ages of detrital and volcanic zircons of the Toro Negro Formation, northwestern Argentina: Age, provenance and sedimentation rates

Isotopic and thermochronologic evidence of extremely cold lithosphere associated with a slab flattening in the Central Andes of Argentina

Fluvial-aeolian interaction deposits in the Andean Foreland basin (Northwest Argentina): Architecture and facies model

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