Seismic stratigraphy of Lago Fagnano sediments (Tierra del Fuego, Argentina) : A potential archive of paleoclimatic change and tectonic activity since the Late Glacial
| العنوان: | Seismic stratigraphy of Lago Fagnano sediments (Tierra del Fuego, Argentina) : A potential archive of paleoclimatic change and tectonic activity since the Late Glacial |
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| المؤلفون: | Nicolas Waldmann, Ariztegui, D., Anselmetti, F. S., Austin Jr, J. A., Dunbar, R., Moy, C. M., Recasens, C. |
| المصدر: | Geologica Acta, Vol. 6, No 1 (2008) pp. 101-110 Waldmann, N.; Ariztegui, D.; Anselmetti, F.S.; Austin Jr., J.A.; Dunbar, R.M.; Moy, C.M.; Recasens, C. (2008). Seismic stratigraphy of Lago Fagnano sediments (Tierra del Fuego, Argentina)-A potential archive of paleoclimatic change and tectonic activity since the Late Glacial. Geologica Acta, 6(1), pp. 101-110. Universitat de Barcelona 10.1344/105.000000244 <http://dx.doi.org/10.1344/105.000000244> Scopus-Elsevier Geologica Acta; Vol. 6 No 1 (2008); 101-110 Geologica Acta; Vol. 6 No. 1 (2008): GEOSUR 2004: Mesozoic to Quarternary evolution of Tierra del Fuego and neighbouring austral regions II; 101-110 Geologica Acta; Vol. 6 Núm. 1 (2008); 101-110 RCUB. Revistas Científicas de la Universidad de Barcelona instname |
| سنة النشر: | 2008 |
| مصطلحات موضوعية: | Paleocliamte, Paleoclimate, 550 Earth sciences & geology, ddc:550, Paleoseismology, Lacustrine sedimentation, Turbidites |
| الوصف: | Located at 54ºS in the heart of the Island of Tierra del Fuego, Lago Fagnano occupies the deepest of a chain of en-echelon tectonic depressions along the Magallanes-Fagnano Transform system (MFT). A recent geophysical campaign combining 3.5 kHz (pinger) single-channel with 1 in3 airgun multi-channel systems surveyed more than 100 m of glacio-lacustrine sediments filling two main sub-basins. These data provide a unique opportunity to visualize the most recent lacustrine sequence with high-resolution while simultaneously imaging the oldest infill. A preliminary seismic stratigraphic analysis of the high-resolution 3.5 kHz pinger data allowed the identification of three major seismostratigraphic units (A, the oldest and C, the youngest). While unit A is interpreted as glacially derived sediments, the overlying unit B is interpreted as fining upward sequences of proglacial turbidites reflecting sediment pulses released by the retreating Fagnano glacier during the last deglaciation. A major environmental change occurred during deposition of unit C when pelagic style of sedimentation is intercalated by sequences of downslope mass flow events probably triggered by relatively strong tectonic pulses along the MFT system. Gravity cores show a regular alternation of light and dark laminae occasionally interrupted by homogenous sedimentary units interpreted as turbidites. Ultra-high resolution X-ray fluorescence micro-profiles show fluctuations in major trace elements at mm scale that may indicate seasonal variations in the sedimentary influx. These core data provide a unique record of decadal changes in regional climate that can be compared with other marine and continental archives to improve our understanding of the forcing mechanisms behind climate change. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1696-5728 1695-6133 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d19a8dc2983510dd5e9b4d4e3ffef2cd https://archive-ouverte.unige.ch/unige:1305 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....d19a8dc2983510dd5e9b4d4e3ffef2cd |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 16965728 16956133 |
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