Format:
Online-Ressource (PDF-Datei: xv, 104, XII S., 17.515 kB)
,
graph. Darst., Kt.
Content:
Active continental margins are affected by complex feedbacks between tectonic, climate and surface processes, the intricate relations of which are still a matter of discussion. The Chilean convergent margin, forming the outstanding Andean subduction orogen, constitutes an ideal natural laboratory for the investigation of climate, tectonics and their interactions. In order to study both processes, I examined marine and lacustrine sediments from different depositional environments on- and offshore the south-central Chilean coast (38-40ʿS). I combined sedimentological, geochemical and isotopical analyses to identify climatic and tectonic signals within the sedimentary records. The investigation of marine trench sediments (ODP Site 1232, SONNE core 50SL) focused on frequency changes of turbiditic event layers since the late Pleistocene. In the active margin setting of south-central Chile, these layers were considered to reflect periodically occurring earthquakes and to constitute an archive of the regional paleoseismicity. The new results indicate glacial-interglacial changes in turbidite frequencies during the last 140 kyr, with short recurrence times (~200 years) during glacial and long recurrence times (~1000 years) during interglacial periods ...
Note:
Potsdam, Univ., Diss., 2009
Additional Edition:
Erscheint auch als Druck-Ausgabe Stefer, Susanne Late Pleistocene-Holocene sedimentary processes at the active margin of South-Central Chile Potsdam, 2009
Language:
English
Keywords:
Hochschulschrift
URN:
urn:nbn:de:kobv:517-opus-33731
URL:
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