Facies analysis and basin architecture of the Neogene Subandean synorogenic wedge, southern Bolivia

Uba, Cornelius E.; Christoph, Heubeck; Hulka, Carola

doi:10.1016/j.sedgeo.2005.06.013

Cited by 122 publications

(54 citation statements)

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“…Such upward thickening and coarsening trends have been recognized in modern fans as indicative of fan progradation Sinha, Ahmad, Gaurav, & Morin, 2014), and interpreted from ancient systems (e.g. DeCelles & Cavazza, 1999;Uba et al, 2005;Owen et al, 2017). Yet, this data set shows that not all upward thickening and coarsening trends occur across the entire fan, or even across an area of 20 km (see also Rittersbacher et al, 2014;Owen et al, 2017;Chesley & Leier, 2018; Figure 11).…”

Section: Complexity Of Vertical Trendsmentioning

confidence: 90%

“…In the vertical section, the basin-scale transitions translate into a general trend where dominantly fine-grained overbank deposits with minor volumes of isolated, coarser channel fills are progressively followed upwards in the stratigraphy by more sand rich, larger and increasingly amalgamated channel bodies, with lesser volumes of preserved mud-prone overbank strata (Figure 11a,b; see stratigraphic model in Weissmann et al, 2013;but also Singh et al, 1993;Willis, 1993;Nakayama & Ulak, 1999;Shukla et al, 2001;Uba et al, 2005;Nichols & Fisher, 2007;Wilson et al, 2014;Owen et al, 2017). Such upward thickening and coarsening trends have been recognized in modern fans as indicative of fan progradation Sinha, Ahmad, Gaurav, & Morin, 2014), and interpreted from ancient systems (e.g.…”

Section: Complexity Of Vertical Trendsmentioning

confidence: 92%

“…of the Neuquén Basin (Barros et al, 2016). Much progress has been made during the last decades, but despite the exponential increase in last few years in the number of publications dealing with fluvial fans systems (see review in Ventra & Clarke, 2018, and references therein), our current understanding of fluvial fan stratigraphy is limited to the recognition of general lateral and vertical trends that result from long-term fan progradation, in which dominantly fine-grained overbank deposits with minor volumes of isolated, coarser channel fills are progressively followed upwards in the stratigraphy by the coarser, possibly larger, and increasingly amalgamated channel bodies, with lesser volumes of preserved mud-prone overbank strata (see stratigraphic model in Weissmann et al, 2013, but also Singh, Parkash, & Gohain, 1993Willis, 1993;Nakayama & Ulak, 1999;Shukla et al, 2001;Uba, Heubeck, & Hulka, 2005;Nichols & Fisher, 2007;Wilson, Flint, Payenberg, Tohver, & Lanci, 2014;Owen, Nichols, Hartley, & Weissmann, 2017;Ventra & Clarke, 2018), and the corresponding paleosol moisture variability (Bhattacharyya et al, 2011;Hartley et al, 2013;Trendell, Atchley, & Nordt, 2013). While these achievements considerably increase our ability to predict fluvial stratigraphy and thus reservoir properties, further stratigraphic complexities have been highlighted by some ancient studies, such as inconsistencies in across-basin vertical trends or in the lateral channel body variability (Chesley & Leier, 2018), fining-up rather than coarsening-up vertical trends (Kukulski et al, 2013), or simply weak trends and lateral variability (Rittersbacher, Howell, & Buckley, 2014).…”

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confidence: 99%

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Stratigraphic complexity in fluvial fans: Lower Eocene Green River Formation, Uinta Basin, USA

Wang

Plink‐Björklund

2019

Basin Research

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In this study, measured outcrop sections and geolocated photomosaics are integrated with areal mapping of channel dimensions, degree of amalgamation, calculations of channel‐to‐floodplain ratios and sedimentary facies variability to study and quantify the channel and floodplain deposits in the Sunnyside Delta Interval of the Lower Eocene Green River Formation in the Uinta Basin, Utah. Vertically, sand content and bed thickness increases, due to an increase in the channel‐to‐floodplain ratio, channel size and the degree of channel amalgamation. Laterally, the channel‐to‐floodplain ratio, channel size, the degree of channel amalgamation and the sand content in channel facies decreases in the paleo‐downstream direction. Such vertical and lateral transitions identify the Sunnyside Delta Interval as a fluvial fan (or distributive fluvial system). However, the vertical and lateral transitions occur at multiple spatial scales, demonstrating considerable stratigraphic complexity as compared to the existing facies and architectural models suggested for fluvial megafans and distributive fluvial systems. The smallest‐scale transitions are identified as avulsion‐related packages that form the building blocks of the stratigraphy, whereas the intermediate‐ and largest‐scale transitions are suggested to be related to lobe and whole fan progradation respectively. This documented complexity indicates the significance of self‐organization in building fluvial fan stratigraphy, and demonstrates that changes in the degree of channel amalgamation or in channel‐to‐floodplain ratio are not linked to accommodation changes. On facies scale, an abundance of Froude supercritical‐flow and high‐deposition‐rate facies, in‐channel mud deposits, and in‐channel bioturbation and desiccation indicate deposition in rivers with highly variable discharge. Such discharge conditions suggest seasonally and inter‐annually variable precipitation conditions in the US Western Interior in the Early Eocene.

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Section: Complexity Of Vertical Trendsmentioning

confidence: 90%

Section: Complexity Of Vertical Trendsmentioning

confidence: 92%

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confidence: 99%

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Stratigraphic complexity in fluvial fans: Lower Eocene Green River Formation, Uinta Basin, USA

Wang

Plink‐Björklund

2019

Basin Research

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“…5-7). Nine major lithofacies are identified (Table DR1 [see footnote 1]) accord ing to standard codes and procedures (e.g., Miall, 1996;Uba et al, 2005). Laminated silt stone (Fl), often capping coarser sandstone or arranged in upwardfining packages (Figs.…”

Section: Lithofacies Classificationsmentioning

confidence: 99%

Punctuated shortening and subsidence in the Altiplano Plateau of southern Peru: Implications for early Andean mountain building

et al. 2014

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Sedimentologic, provenance, geochronologic, and magnetostratigraphic results from clastic nonmarine deposits in the northern Altiplano Plateau of southern Peru (14-15°S) demonstrate late Eocene-Oligocene (37-26 Ma) accumulation of the >4-km-thick San Jerónimo (Puno) Group within a retroarc foreland basin related to early Andean shortening and crustal thickening. Punctuated Oligocene (29-26 Ma) displacement along deep-seated contractional structures, as revealed by growth stratal relationships, abruptly partitioned this regional flexural basin and established the structural boundaries of the smaller intermontane Ayaviri Basin, which continued to evolve in a hinterland setting during late Oligocene-Miocene shortening. This brief episode of shortening along the Altiplano-Eastern Cordillera boundary is correlated with exceptionally rapid sediment accumulation (>1100-1800 m/m.y.), tightly constrained to 30-28 Ma on the basis of U-Pb geochronology and magnetic polarity stratigraphy. Provenance data from detrital zircon U-Pb age populations and sandstone compositions indicate derivation from a complex belt of Paleogene shortening and probable basin inversion in the Western Cordillera that was subsequently overprinted by Andean arc magmatism. This early Andean zone is interpreted as the along-strike continuation of the better-exposed Marañon fold-thrust belt to the north (5-13°S) and a proposed belt of shortening to the south along the Chilean Precordillera and Western Cordillera of Bolivia and northern Argentina (17-25°S). Subsequent focusing of late Oligocene shortening along the Eastern Cordillera-Altiplano boundary may have been linked to shallowing of the subducting slab and potential reactivation of crustal anisotropies.

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“…The Puna-Altiplano region, also known as the Central Andean Plateau, is characterized by average elevations over 3.7 km, and it extends along strike for 1500 km (e.g., Isacks, 1988). Former foreland-basin deposits are preserved within the plateau interior and at its eastern margin (i.e., Eastern Cordillera) and have been used to constrain the pattern and timing of contractional deformation, erosion, and sedimentation (Jordan and Alonso, 1987;Viramonte et al, 1994;Vandervoort et al, 1995;Reynolds et al, 2000;Marrett and Strecker, 2000;DeCelles and Horton, 2003;Uba et al, 2005;Jordan and Mpodozis, 2006). Based on sedimentological, structural, and geophysical data, different authors have proposed that crustal thickening, eastward propagation of deformation, and initiation and development of a foreland-basin system began during the mid-Cretaceous and continued throughout the Tertiary (e.g., Horton et al, 2001;McQuarrie and DeCelles, 2001;DeCelles and Horton, 2003;Carrapa et al, 2005;Arriagada et al, 2006;Carrapa and DeCelles, 2008).…”

Section: Introductionmentioning

confidence: 99%

Dynamics of deformation and sedimentation in the northern Sierras Pampeanas: An integrated study of the Neogene Fiambala basin, NW Argentina

Carrapa

Hauer

Schoenbohm

et al. 2008

Geological Society of America Bulletin

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The thick-skinned Sierras Pampeanas morphotectonic domain of western and northwestern Argentina (27°S-33°S) is characterized by reverse-fault-bounded basement blocks that delimit internally deformed, Neogene sedimentary basins. Forelandbasin evolution in this part of the Andes is still not very well understood. For example, challenging questions exist as to how thickskinned deformation develops, if there are distinct spatiotemporal trends in deformation and exhumation, how such deformation styles infl uence sedimentation patterns, and whether or not broken foreland basins are related to regional plate-tectonic processes, such as fl at-slab subduction.The Fiambalá basin of the northwestern Sierras Pampeanas is the largest of several intermontane basins in the transition to the southern margin of the Puna Plateau. This basin preserves a thick continental Neo-gene sequence that provides information on the dynamics of thick-skinned deformation and resulting sedimentation. The Fiambalá basin contains ~4 km of fl uvial-alluvial sedimentary rocks that comprise the Tamberia, Guanchin, and Punaschotter Formations. U-Pb geochronology of ashes intercalated within the Fiambalá stratigraphic sequence demonstrates that these sedimentary rocks are late Miocene to Pliocene (8.2 ± 0.3 Ma to 3.05 ± 0.4 Ma) in age. Sedimentology and provenance data indicate that the source of the Tamberia Formation was located to the west of the modern western basin-bounding range. The Guanchin and Punaschotter Formations record input from local sources, including the modern basin-bounding range to the west and the southern Puna Plateau to the north, suggesting reorganization of the catchment area at ca. 5.5 Ma.The coarsening-upward trends recorded by the fl uvial Tamberia and Guanchin Formations indicate enhanced tectonics and relief during sedimentation. The Punaschotter conglomerates record alluvial-fan sedimentation and local sources. Fault kinematic data document a contractional regime, characterized by E-W and NE-SW shortening, active throughout the middle-late Miocene and Pliocene. Furthermore, a comparison between the Fiambalá basin and similar sedimentary basins in the Sierras Pampeanas (e.g., Bermejo foreland basin) and the Eastern Cordillera leads us to propose that the study area originally constituted an integral part of a continuous and more extensive foreland-basin system (thin-skinned) for much of its early history. Our data suggest coeval intrabasin deformation along strike from the Bermejo region northward to the Eastern Cordillera. The coeval change at ca. 6 Ma from a regional to more compartmentalized (thick-skinned) tectono-sedimentary environment in the regions adjacent to the Eastern Cordillera, the southern Puna margin, and other sectors within the Sierras Pampeanas domain may thus refl ect a regional tectonic process related to fl at subduction. Our data, combined with existing sedimentological and petrological evidence, imply that the passage from steep to fl at subduction occurred synchronously from ~30°S to ~26°S.

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Facies analysis and basin architecture of the Neogene Subandean synorogenic wedge, southern Bolivia

Cited by 122 publications

References 51 publications

Stratigraphic complexity in fluvial fans: Lower Eocene Green River Formation, Uinta Basin, USA

Stratigraphic complexity in fluvial fans: Lower Eocene Green River Formation, Uinta Basin, USA

Punctuated shortening and subsidence in the Altiplano Plateau of southern Peru: Implications for early Andean mountain building

Dynamics of deformation and sedimentation in the northern Sierras Pampeanas: An integrated study of the Neogene Fiambala basin, NW Argentina

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