Geothermal and Tectonic Evolution of the Eastern Cordillera and the Subandean Ranges of Southern Bolivia

Kley, Jonas; Reinhardt, M.

doi:10.1007/978-3-642-77353-2_11

Cited by 12 publications

(10 citation statements)

References 7 publications

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“…The structural nature of these basins is not well defined. Because the Eastern Cordillera and easternmost Altiplano was a domain of west-verging thrusting during this time interval (Horton 1996, Kennan et al 1995, Kley et al 1996, the Altiplano may have behaved as a foreland basin (Baby et al 1990, Gubbels et al 1993, which is consistent with the broad area and thickness of the early and middle Miocene strata. Existing rock descriptions suggest that low-gradient streams and shallow lakes were common, but conditions were not appropriate for creating evaporites.…”

Section: Sedimentary Basin Variation Within the High Plateaumentioning

confidence: 81%

“…The Eastern Cordillera is the site of an important change in vergence, from predominantly east-verging in the Subandean belt and eastern part of the Eastern Cordillera to west-verging structures that form the eastern boundary of the Altiplano (Kley et al 1996, Roeder 1988. The magnitude of Andean shortening within the Eastern Cordillera has proven difficult to determine for several reasons: (a) The rocks exposed are a monotonous, featureless sequence of Ordovician strata; (b) those strata were deformed prior to the Andean Orogeny (i.e.…”

Section: Shortening In the Eastern Cordillera And Altiplanomentioning

confidence: 99%

“…• S, where greater preservation of Tertiary strata facilitates the identification of Andean structures and where crustal scale refraction and magnetotelluric data provide some additional constraints , Kley et al 1996, Kley & Reinhardt 1994, Schmitz 1994.…”

Section: Shortening In the Eastern Cordillera And Altiplanomentioning

confidence: 99%

“…In general, thrusting and crustal shortening in what is now the high plateau progressed from west to east (Kley et al 1996, Sempere et al 1990b. In Paleocene to early Oligocene time (∼60-30 Ma), the region east of today's magmatic arc functioned mostly as the foreland basin to a zone of shortening in Chile (Sempere et al 1997), but some shortening occurred in the Eastern Cordillera and easternmost Altiplano (Kennan et al 1995, Sempere et al 1997.…”

Section: Initial Conditions and Timing Of Upliftmentioning

confidence: 99%

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The Evolution of the Altiplano-Puna Plateau of the Central Andes

Allmendinger

Jordan²,

Kay³

et al. 1997

Annu. Rev. Earth Planet. Sci.

817

658

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▪ Abstract The enigma of continental plateaus formed in the absence of continental collision is embodied by the Altiplano-Puna, which stretches for 1800 km along the Central Andes and attains a width of 350–400 km. The plateau correlates spatially and temporally with Andean arc magmatism, but it was uplifted primarily because of crustal thickening produced by horizontal shortening of a thermally softened lithosphere. Nonetheless, known shortening at the surface accounts for only 70–80% of the observed crustal thickening, suggesting that magmatic addition and other processes such as lithospheric thinning, upper mantle hydration, or tectonic underplating may contribute significantly to thickening. Uplift in the region of the Altiplano began around 25 Ma, coincident with increased convergence rate and inferred shallowing of subduction; uplift in the Puna commenced 5–10 million years later.

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Section: Sedimentary Basin Variation Within the High Plateaumentioning

confidence: 81%

Section: Shortening In the Eastern Cordillera And Altiplanomentioning

confidence: 99%

Section: Shortening In the Eastern Cordillera And Altiplanomentioning

confidence: 99%

Section: Initial Conditions and Timing Of Upliftmentioning

confidence: 99%

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The Evolution of the Altiplano-Puna Plateau of the Central Andes

Allmendinger

Jordan²,

Kay³

et al. 1997

Annu. Rev. Earth Planet. Sci.

817

658

View full text Add to dashboard Cite

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“…This author proposed that the deformation could be younger, as there is no evidence of an angular unconformity separating the Upper Ordovician deposits outcropping in Cordillera Oriental from the overlying Lower Paleozoic sequences. Likewise, K-Ar ages of fine-grained micas obtained for Ordovician very low grade metapelites of the Eastern Cordillera of southern Bolivia rule out the existence of orogenic activity during the Late Ordovician and attribute the deformation to a Late Devonian-Early-Carboniferous (Kley and Reinhardt, 1994;Tawackoli et al, 1996) or Late Carboniferous-Early Permian orogenic episode (Jacobshagen et al, 2002).…”

Section: Geological Frameworkmentioning

confidence: 98%

Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index.

Campo

Nieto²,

Albanesi

et al. 2017

andgeo

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ABSTRACT. The thermal post-depositional evolution of metapelitic and metavolcanic rocks of the upper CambrianOrdovician succession in the Central Andes of northwestern Argentina, was estimated through X ray diffraction of clay mineral analysis, Kübler Index (KI), SEM-EDS study of selected samples and chlorite geothermometry. The study area comprise five representative regions in Puna and Cordillera Oriental, namely at Sierra de Santa Victoria (Nazareno and Santa Victoria river areas), Cordón de los Siete Hermanos (Yavi), Sierra de Rinconada and Sierra de CochinocaEscaya. The paleotemperatures obtained with the chlorite geothermometer, in coincidence with KI values, show an E-W trend from diagenesis/low anchizone in the eastern flank of Sierra de Santa Victoria, to high anchizone/epizone in the Puna, with intermediate values in the western flank of Sierra de Santa Victoria. This trend, in conjunction with the development of slaty cleavage in the Ordovician rocks from Yavi, Sierra de Cochinoca-Escaya and western localities coincide with the limits proposed for the "Ocloyic deformation belt". The common occurrence of kaolinite in the slates and the metavolcanic rocks of Sierra de Cochinoca-Escaya, coupled with the substitution of chlorite by interstratified lower-temperature phases in most of these rocks and the occurrence of jarosite in a metadacite, indicate presence of hydrothermal fluids with high H + /cations ratios, producing acid type alteration (Utada, 1980), at temperatures between 100 and ~300 °C. The hydrothermal alteration should have been subsequent to the maximum burial and the attainment of epizonal metamorphism, and was very probably related with the posthumous activity of the Ordovician volcanic arc. The widespread occurrence of retrograde diagenesis products (smectite, kaolinite, as well as interstratified Chl/Sm and Chl/Vrm phases) in the anchizonal/epizonal metapelites of Sierra de Cochinoca-Escaya and Sierra de Rinconada constitute, up to our knowledge, the first report of an extensive hydrothermal activity affecting not only the metavolcanic rocks but also the Lower Ordovician sediments of northern Puna.Keywords: Low-grade metamorphism, Retrodiagenesis, Geothermometry, Chlorite. RESUMEN. Determinación de la historia térmica posdepositacional de las sucesiones ordovícicas del noroeste de Argentina mediante análisis de arcillas, geotermometría de la clorita e índice de Kübler. Estudios por difracción de rayos-X de rocas metapelíticas y metavolcánicas, complementadas con análisis textural a escala del SEM y microanálisis de muestras seleccionadas, con geotermometría de la clorita, han permitido delinear la historia diagenética-metamórfica prograda de las sucesiones del Cámbrico superior-Ordovícico de los Andes Centrales del NW de Argentina e identificar 180 Outlining the thermal pOsdepOsitiOnal evOlutiOn Of the OrdOvician successiOns Of nOrthwestern argentina... reacciones retrógradas. El estudio se centró en cinco localidades de Puna y Cordillera Oriental: sierra de Santa Victoria (zona de lo...

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