Structural evolution and magmatic characteristics of the Agrio fold-and-thrust belt

Valcarce, Gonzalo Zamora; Zapata, Tomás; Pino, Daniel del; Ansa, Andrés

doi:10.1130/2006.2407(06)

Cited by 32 publications

(36 citation statements)

References 5 publications

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“…New data used to generate the results of Tables 1 and 2, and displayed in belongs to this work and are available in the Supporting Information (S1, S2, S3, and S4). Data displayed in Figures 2 and 3 are available through Muñoz (1996), Jordan et al (2001), Burns (2002, Cobbold and Rossello (2003), Folguera et al (2003Folguera et al ( , 2006Folguera et al ( , 2007Folguera et al ( , 2015, García Morabito and Folguera ( 2005), Kay et al (2006), Melnick et al (2006), Burns et al (2006), Zamora Valcarce et al (2006, 2009, Messager et al ( 2010), Tunik et al (2010), Thomson et al (2010), Sagripanti et al (2011Sagripanti et al ( , 2012Sagripanti et al ( , 2015Sagripanti et al ( , 2016Sagripanti et al ( , 2017, Di Giulio et al (2012Giulio et al ( , 2016, Cerimedo et al (2013), Gürer et al (2015), Rojas , Fennell et al (2015Fennell et al ( , 2019, and Sánchez et al (2018Sánchez et al ( , 2020. Data displayed in Figure 4 are available through JICA (1983,1984), Llambías et al (1978Llambías et al ( , 2007, Nullo et al (2005), Miranda et al (2006),…”

Section: Discussionmentioning

confidence: 99%

Cretaceous and Eocene Rapid Cooling Phases in the Southern Andes (36°–37°S): Insights From Low‐Temperature Thermochronology, U‐Pb Geochronology, and Inverse Thermal Modeling From Domuyo Area, Argentina

et al. 2021

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The westward acceleration of the South American plate after the opening of the Southern Atlantic Ocean during the Late Cretaceous has been regarded as the driving mechanism for the onset of contractional tectonics along the western margin of South America, ultimately promoting the inversion of Mesozoic backarc basins and the formation of the Andean mountain chain (Ramos, 2009;Somoza & Zaffarana, 2008) (Figure 1). Since then, deformation processes have been mainly controlled by the geometry of the oceanic slab and the rate and obliquity of convergence between the subducting and South American plates (e.g.,

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Section: Discussionmentioning

confidence: 99%

Cretaceous and Eocene Rapid Cooling Phases in the Southern Andes (36°–37°S): Insights From Low‐Temperature Thermochronology, U‐Pb Geochronology, and Inverse Thermal Modeling From Domuyo Area, Argentina

et al. 2021

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“…Cerro Mulichinco outcrops of Vaca Muerta Formation contain one of the most abundant (~10% of the formation's volume, Rodrigues et al, 2009), thickest, and most laterally continuous BPF in the world (Ukar et al, 2020). Aditionally, in this site, numerous tectonic (non-bed parallel) fractures are also present due to the influence of the Agrio fold-and-thrust belt deformation (Valcarce et al, 2006). The different fracture analysis existing at this location do not discriminate bed-parallel fractures from the rest, therefore an analysis of the vertical distribution of BPF was not possible.…”

Section: Secondary Fissility Controlsmentioning

confidence: 93%

Relationship between fissility, composition, rock fabric and reservoir properties in Vaca Muerta Formation (Neuquén Basin, Argentina): from outcrop to subsurface core data

Martín

Marchal²,

Barredo

et al. 2022

andgeo

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The fissility is the ability of some rocks to split along relatively smooth surfaces parallel to the bedding. This property observed mostly in fine-grained rocks is particularly expressed in outcrops, where rocks are subjected to weathering processes. Most authors associate the fissility to the abundance of clay minerals and their orientation parallel to the bedding. The horizontal fabric can be promoted by depositional conditions such as sediment composition, quantity of total organic carbon content (TOC) and depositional mechanisms, giving rise to a primary fissility. Alternatively, the alignment of platy minerals can be linked to the burial history of the rock, by processes such as mechanical compaction or secondary mineral growth, resulting in a secondary fissility. The present study aims to identify the main controls of fissility development at the micro- and macroscopic scale in rocks of the Vaca Muerta Formation exposed in the Cerro Mulichinco area and in a 121-meter-long core extracted from a well within the Neuquén Basin. In outcrops, fissility is related to fine-grained laminated facies with low carbonate content, revealing the strong control exerted by lithology. The TOC measurements allow establishing a positive correlation between organic matter content and fissility intensity. Moreover, the analysis of the transgressive-regressive cycles shows that fissility is higher around the maximum flooding surfaces. Regarding their mechanical characteristics, the different interfaces observed in core are classified into first and second-order, the last one including fissility planes. Some of these interfaces evolve from potential (partially open) to effective (totally open) discontinuities in response to changes of stress conditions during the core extraction and due to the stress relaxation through time: weeks (T1), months (T2) and years (T3) after extraction. The time evolution of the effective core discontinuities points out rock intervals that are variably broken and core segments that remain intact. The Drying Alcohol Discontinuities (DAD) methodology reveals potential discontinuities within apparently intact core segments. By using this technique, a 4-class index is established as a proxy for fissility degree. When integrated with geological, petrophysical and geomechanical data, this index enables characterizing the main mechanisms controlling rock fissility that express through discontinuities promoting the loss of competence of a rock. Consequently, this mechanical property is considered to influence the efficiency of hydraulic fracture in shale reservoir completion.

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“…The R ıo Negro, formed by the confluence between the Limay and Neuqu en branches, is the largest river in Patagonia. Sourced in the Cordillera Principal, it drains the Agrio fold-thrust belt and the Neuqu en Basin, where an Upper Triassic to Palaeogene succession including continental and marine siliciclastic rocks, carbonates and evaporites is exposed (Howell et al, 2005;Zapata & Folguera, 2005;Valcarce et al, 2006). Annual water discharge (23 km 3 for R ıo Limay and 9 km 3 for R ıo Neuqu en; Bonetto & Wais, 2006) has two maxima, fed by heavy rains from May to August and by melting of mountain ice and snow in the spring.…”

Section: R ıO Negromentioning

confidence: 99%

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

et al. 2021

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Large sediment masses are transferred over many hundreds of kilometres along the coast of passive continental margins worldwide. The relevance of such a phenomenon for source-to-sink studies, environmental issues, and coastal management remains largely unperceived. This study traces the paths of volcaniclastic sand along ca 2170 km of the Argentine coast and documents a 760 km long cell of littoral transport extending from the formerly larger R ıo Colorado delta to the edge of the R ıo de la Plata mouth. During deglaciation stages and humid periods of the Pleistocene, a much greater sediment volume than today was transferred by the Desaguadero and Colorado rivers from the highest-relief tract of the Andean Cordillera to the Atlantic Ocean. Amphibole-rich sand originally supplied by the R ıo Desaguadero is being recycled today from Pampean lowlands to feed the beaches along R ıo de la Plata southern shores, whereas pure quartzose sand of R ıo Paran a is found only adjacent to its prograding delta. Augite-rich sand supplied by the R ıo Colorado is dominant along the coast of the Buenos Aires Province, where it mixes locally with coarser-grained quartz-rich detritus recycled in the urbanized Mar del Plata area. Hypersthene-rich sand of the R ıo Negro is dispersed both north and south of the mouth, where heavy-mineral-rich lag deposits are formed in areas of accelerated erosion and retreating sea cliffs. Changes of mineralogical signatures during long-distance littoral transport are largely ascribed to local supply from coastal erosion or hydrodynamic effects rather than to selective breakdown of labile grains. Whereas the relative abundance of amphibole and pyroxene is largely independent of transport distance, olivine is depleted both in the northern part of the Colorado littoral cell and south of the R ıo Negro mouth, which is chiefly ascribed to dilution by recycling of Neogene sediments that have undergone early intrastratal dissolution rather than to mechanical loss.Keywords Amphibole Color Index, Colorado and Negro rivers, durability of olivine and pyroxene, longshore sand transport, passive-margin sediments, R ıo de la Plata estuary, R ıo Desaguadero, sedimentary petrology, Southern Hemisphere swells.

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Structural evolution and magmatic characteristics of the Agrio fold-and-thrust belt

Cited by 32 publications

References 5 publications

Cretaceous and Eocene Rapid Cooling Phases in the Southern Andes (36°–37°S): Insights From Low‐Temperature Thermochronology, U‐Pb Geochronology, and Inverse Thermal Modeling From Domuyo Area, Argentina

Cretaceous and Eocene Rapid Cooling Phases in the Southern Andes (36°–37°S): Insights From Low‐Temperature Thermochronology, U‐Pb Geochronology, and Inverse Thermal Modeling From Domuyo Area, Argentina

Relationship between fissility, composition, rock fabric and reservoir properties in Vaca Muerta Formation (Neuquén Basin, Argentina): from outcrop to subsurface core data

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

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