LOESS RECORDS | South America
作者： M.A. Zárate
DOI: 10.1016/B0-44-452747-8/00165-4
关键词: Holocene 、 Pleistocene 、 Geology 、 Aeolian processes 、 Loess 、 Glacial period 、 Paleosol 、 Paleontology 、 Late Miocene 、 Magnetostratigraphy
摘要: The loess record of southern South America covers a vast region the heterogeneous Chaco-Pampean plain and mountain valleys Sierras Pampeanas. Pampean extending from late Miocene to Holocene is dominantly composed loessoid (loess-like) deposits resulting reworking primary deposits. Loess becomes regionally important during last glacial cycle. successions are characterized by occurrence carbonate accumulations, rich vertebrate fossil content, pedogenic features throughout sections commonly welded paleosols. Impact glasses (escorias) remarkable feature Pampas successions. loess–paleosol sequence Tucuman constitutes most continuous continental high resolution. It extends back around 1.15 Ma. Chaco known in general but detailed studies remain be done. reveals composition across region. Andes Cordillera has been main source area Pampeanas, Parana basin, some other local sources have also contributed as secondary areas. Inferred westerly southwesterly wind directions, dominant carriers eolian deposits, agreement with paleowind simulations using climate models.
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