Miocene Landscape Evolution and Geomorphologic Controls on Epithermal Processes in the El Indio-Pascua Au-Ag-Cu Belt, Chile and Argentina

Bissig, Thomas; Clark, Alan H.; Lee, James K.W.; Hodgson, C. J.

doi:10.2113/gsecongeo.97.5.971

Cited by 75 publications

(59 citation statements)

References 40 publications

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“…3e; Mercer, 1983). In the latitudes of the study 508 area, glaciers are localized, inefficient erosion agents (Bissig et al, 2002), and thus an 509 unlikely cause for our observed low 10 Be concentrations, especially at foreland-S ca. 2 510…”

Section: Evidence In Favor Of a Tectonic Control Of Mass Fluxes 490mentioning

confidence: 93%

Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera

Val

Hoke

Fosdick

et al. 2016

Earth and Planetary Science Letters

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The temporal evolution of erosion over million-year timescales is key to understand the 26 development of mountain ranges and adjacent fold-and-thrust belts. While models of 27 orogenic wedge dynamics predict an instantaneous response of erosion to pulses of rock 28 uplift, stream-power based models predict that catchment-wide erosion maxima 29 significantly lag behind a pulse of rock uplift. Here, we explore the relationships between 30 rock uplift, erosion, and sediment deposition in the Argentine Precordillera fold-and-31 thrust belt at 30°S. Using a combination of 10 Be-derived paleo-erosion rates, constraints 32 on re-exposure using 26 Al/ 10 Be ratios, geomorphic observations and detrital zircon 33 provenance, we demonstrate that the attainment of maximum upland erosion rates lags 34 the maximum rate of deformation over million-year timescales. The magnitudes and 35 causes of the erosional delays shed new light on the catchment erosional response to 36 tectonic deformation and rock uplift in orogenic wedges. 37 38

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Section: Evidence In Favor Of a Tectonic Control Of Mass Fluxes 490mentioning

confidence: 93%

Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera

Val

Hoke

Fosdick

et al. 2016

Earth and Planetary Science Letters

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“…Gregory-Wodziki (2000), based on various lines of evidence, concluded that the Altiplano of the central Andes had attained no more than half its modern elevation by 10.7 Ma, and that surface uplift of 2,300-3,400 m occurred since the Late Miocene. Bissig et al (2002) also recognized an important erosional surface in the high central Andes that formed in the interval 10-6 Ma.…”

Section: Depositional Environment and Tectonic Eventsmentioning

confidence: 99%

Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications

Gutiérrez

Hinojosa

Roux

et al. 2013

andgeo

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ABSTRACT. The age of the Navidad Formation in central Chile has always been controversial, mainly due to the conflicting age ranges indicated by its macro-and microfossils. Macrofossils are generally interpreted as having been reworked from older, Early to Middle Miocene strata, whereas a Late Miocene-Pliocene age has been accepted on the basis of planktonic foraminifer index species. The results of this study, however, indicate that the macrofossils occur in situ, which necessitates a complete revision of the geochronological data. It is concluded that the evidence for an Early to Middle Miocene age is overwhelming, and that the planktonic foraminifer index species must have appeared in the SE Pacific earlier than elsewhere. These include Globoturborotalia apertura, Globorotalia puncticulata (Deshayes), Globorotalia spheriomizea (Walters), Neogloboquadrina pachyderma (Ehrenberg), and Neogloboquadrina acostaensis (Blow). An Early to Middle Miocene age for the Navidad Formation correlates well with a reinterpretation of its depositional environment as a continental shelf instead of a deepwater continental slope, global and regional paleoclimatic events, and the tectonic development of the Andes Range. RESUMEN. Evidencias de una edad miocena temprana-media de la Formación Navidad: Implicancias paleontológicas, paleoclimáticas y tectónicas. La edad de la Formación Navidad en Chile central siempre ha sido controversial, debido a los distintos rangos de edad indicados por los macro-y microfósiles. En general, se considera que los macrofósiles han sido retrabajados de estratos del Mioceno Temprano a Medio, y se aceptó una edad miocena tardía para esta unidad sobre la base de especies indicadoras de foraminíferos planctónicos. Sin embargo, los resultados de este estudio indican que los macrofósiles ocurren in situ, lo cual hace necesario una revisión completa de los datos geocronológicos. Se concluye que la evidencia por una edad miocena temprana a media es contundente, y que los foraminíferos planctónicos que indicarían una edad miocena tardía aparecieron más temprano en el SE del océano Pacífico que en otras partes. Estos foraminíferos incluyen Globoturborotalia apertura, Globorotalia puncticulata (Deshayes), Globorotalia spheriomizea (Walters), Neogloboquadrina pachyderma (Ehrenberg), y Neogloboquadrina acostaensis (Blow). Una edad miocena temprana a mediana correlaciona bien con la reinterpretación del ambiente deposicional como una plataforma continental en vez de un talud continental con agua profunda, eventos paleoclimáticos reconocidos a escala global y regional, y el desarrollo tectónico de los Andes. Medio, Tectonismo andino, Diagonal Árido. Palabras clave: Especies indicadoras de foraminíferos, Óptimo Climático del Mioceno

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“…Estos pedimentos se agrupan en: la superficie Sierra Checos del Cobre, de probable edad oligocena; la superficie Asientos (>17,5 Ma) y el Pediplano de Atacama (15-10 Ma) (Bissig y Riquelme, 2009. En la región semiárida, entre los 29,5-30,5°S, tres superficies escalonadas de pedimentos fueron diferenciados en los interfluvios de la Cordillera Principal oriental, donde la presencia de niveles volcánicos -cubriendo cada uno de ellos-permitió diferenciarlos y datarlos en: Superficie Frontera-Deidad (17-15 Ma), Superficie Azufrera-Torta (14-12,5 Ma) y Superficie Los Ríos (10-6 Ma) (Bissig et al, 2002). Aguilar et al (2011) estimaron tasas de erosión media de entre 45 y 70 m/Ma para la incisión de la Superficie Los Ríos y formación de los actuales valles de la Cordillera Principal oriental de la región semiárida.…”

Section: Marco Geomorfológicounclassified

Role of climate and tectonics in the geomorphologic evolution of the Semiarid Chilean Andes between 27-32°S.

Aguilar

Riquelme

Martinod

et al. 2013

andgeo

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RESUMEN.Un análisis morfométrico que considera la pendiente topográfica y la hipsometría, evidencia las diferencias longitudinales y latitudinales en el grado de madurez del relieve de la región andina entre los 27-32ºS. Mientras que el rejuvenecimiento del paisaje de la Cordillera de la Costa se produce al sur de los 29,5°S, en la Cordillera Principal ello ocurre al sur de los 28,5°S. La combinación entre un clima más húmedo hacia el sur y la presencia de segmentos con diferentes rasgos tectónicos explicarían estas variaciones. Longitudinalmente, los rasgos geomorfológicos indican la presencia de un Frente de Montaña que separa la Cordillera de la Costa de la Cordillera Principal. Entre los 28,5° y 30,5°S este frente puede ser atribuido a la actividad del Sistema de Fallas Vicuña-San Félix, la que durante el OligocenoMioceno Temprano habría acomodado el alzamiento relativo de la Cordillera Principal. En respuesta a esta actividad tectónica se habrían formado sucesivos escalones de pedimentos que se encajaron uno con respecto al otro. Durante el Mioceno Medio se produjo un nuevo episodio de alzamiento, que involucró a todo el antearco y es en respuesta a este alzamiento que se excavaron los actuales valles que lo cruzan. Entre los 28,5° y 30,5°S, la cabecera de los valles alcanzaron un rango de altitud suficiente como para generar una erosión fluvio-glacial que ha permitido la incisión de profundos cañones en este segmento de la Cordillera Principal. ABSTRACT. Role of climate and tectonics in the geomorphologic evolution of the Semiarid Chilean Andes between 27-32°S.A morphometric analysis that considers hypsometry and topographic slope reveals longitudinal and latitudinal differences in the degree of maturity of the relief of the Andes between 27-32°S. Whereas landscape rejuvenation of the Coastal Cordillera takes place to the south of 29.5°S, in the Main Cordillera it happens south of 28.5°S. The combination of a wetter climate towards the south and the presence of segments with different tectonic features would explain these variations. Longitudinally, the geomorphological features indicate the presence of a mountain front that separates the Coastal Cordillera and the Main Cordillera. Between 28.5 and 30.5°S this front can be attributed to the activity of the Vicuña-San Félix Fault System, wich during the Oligocene-Early Miocene would have accommodated the relative uplift of the Main Cordillera. In response to this tectonic activity, successive levels of cut-and-fill pediments may have been formed. During the Middle Miocene, there was a new episode of uplift affecting the fore-arc and it is in response to this uplift that the valleys that cross this region were excavated. Between 28.5 and 30.5°S, the valleys head reached a sufficient altitude to generate fluvio-glacial erosion that allowed the incision of deep canyons in this segment of the Main Cordillera.

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Miocene Landscape Evolution and Geomorphologic Controls on Epithermal Processes in the El Indio-Pascua Au-Ag-Cu Belt, Chile and Argentina

Cited by 75 publications

References 40 publications

Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera

Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera

Evidence for an Early-Middle Miocene age of the Navidad Formation (central Chile): Paleontological, paleoclimatic and tectonic implications

Role of climate and tectonics in the geomorphologic evolution of the Semiarid Chilean Andes between 27-32°S.

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