کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4736865 1640863 2013 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Glacial, fluvial and volcanic landscape evolution in the Laguna Potrok Aike maar area, Southern Patagonia, Argentina
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Glacial, fluvial and volcanic landscape evolution in the Laguna Potrok Aike maar area, Southern Patagonia, Argentina
چکیده انگلیسی

We describe the Pleistocene evolution of the landscape in the Laguna Potrok Aike area in southern Patagonia, Argentina, based on a geomorphological survey. Basaltic eruptions generated tablelands and scoria cones between the Late Miocene and Middle Pleistocene, and phreatomagmatic eruptions produced maars during Middle and Late Pleistocene time. The first glaciations during the Early Pleistocene generated a gently undulating to flat landscape that was affected by cryogenic processes; they are documented but not dated. Outwash surfaces indicate that the Greatest Patagonian Glaciation was multi-phased. The eruption that produced Potrok Aike maar truncated terrace levels dating to a Middle Pleistocene glaciation. The abundance of maars dating to this time may be linked to large amounts of water associated with meltwater streams and permafrost. The landscape in the Potrok Aike area has changed little since the Middle Pleistocene and only minor modifications of landforms have occurred due to cryogenesis, moderate fluvial incision, mass wasting and eolian activity.


► One or more glaciations overrode volcanic plateaus between 1.15 and 3.78 Ma.
► The Greatest Patagonian Glaciation had a stepped retreat creating Outwash Fans.
► The Lake Potrok Aike maar truncated glaciofluvial terraces when explode.
► Lavas-permafrost contact could explain the large size of the Potrok Aike maar.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 71, 1 July 2013, Pages 13–26
نویسندگان
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