Randpazifische Tektonik und Vulkanismus im südlichen Chile

Illies, Henning

doi:10.1007/bf01825717

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…DR1 1 ) (Illies, 1967;Muñoz et al, 2000;Jordan et al, 2001). The oldest forearc-related sedimentary units south of the Arauco Peninsula are the Eocene San Pedro and Pupunahue Formations, which are characterized by ~1000-m-thick sandstones with interbedded conglomerates, shales, and coal (Illies, 1967). These continental series are overlain by ~1000-m-thick Miocene marine sediments (Katz, 1963;Illies, 1967;Finger et al, 2007;Encinas et al, 2008).…”

Section: Regional Settingmentioning

confidence: 98%

“…The Central Depression contains up to 3000 m of marine and terrestrial sediments (Fig. DR1 1 ) (Illies, 1967;Muñoz et al, 2000;Jordan et al, 2001). The oldest forearc-related sedimentary units south of the Arauco Peninsula are the Eocene San Pedro and Pupunahue Formations, which are characterized by ~1000-m-thick sandstones with interbedded conglomerates, shales, and coal (Illies, 1967).…”

Section: Regional Settingmentioning

confidence: 99%

“…The oldest forearc-related sedimentary units south of the Arauco Peninsula are the Eocene San Pedro and Pupunahue Formations, which are characterized by ~1000-m-thick sandstones with interbedded conglomerates, shales, and coal (Illies, 1967). These continental series are overlain by ~1000-m-thick Miocene marine sediments (Katz, 1963;Illies, 1967;Finger et al, 2007;Encinas et al, 2008). The Pliocene continental Mininco Formation marks the shift from marine to continental deposition and consists of pyroclastic units, sandstones, and siltstones (Muñoz-Cristi, 1960).…”

Section: Regional Settingmentioning

confidence: 99%

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Late Pleistocene landscape evolution in south-central Chile constrained by luminescence and stable cosmogenic nuclide dating

Rehak

Niedermann

Preusser

et al. 2010

Geological Society of America Bulletin

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Landscapes in tectonically active regions develop in response to a complex interplay between rapid tectonic deformation and surface processes. In order to understand the evolution of these environments and distinguish between the different factors, it is fundamental to identify and quantify geomorphic processes and rates on different time scales. The forearc of south-central Chile provides an ideal setting to elucidate the response of surface processes to climatic and tectonic forcing. However, in contrast to northern Chile, this region has attracted little attention due to diffi culties in quantifying the age of geomorphic surfaces.We use luminescence and stable cosmogenic nuclides ( 3 He, 21 Ne) on conglomeratic units in the Central Depression and fl uvial valley fi lls in the Coastal Cordillera to constrain exposure and burial ages of these units that form major landscape elements in the southern Chilean forearc. Our data indicate that disturbances in the drainage network are controlled by local uplift, which may be caused by deformation above an active blind thrust. In the Coastal Cordillera, local short-term uplift rates reach a minimum of 0.27 mm a -1 and are on the same order as late Quaternary minimum incision rates of 0.15 mm a -1 to 0.43 mm a -1 . The valley fi lls in the Coastal Cordillera have depositional ages of 80 ka and 255 ka, respectively. Exposure ages of the extensive alluvial surfaces in the Central Depression cluster between 135 ka and 175 ka and between 240 ka and 280 ka. Hence, the deposition of these surfaces broadly coincides with marine isotope stages (MIS) 6 and 8 and appears to be climatically driven.

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