Loess of the Pampean formation (Quaternary) in northeast Argentina differs greatly in mineralogic composition from that of North American and European deposits, although generally similar in field appearance and granulometric composition. The abundance of plagioclases, the composition of the heavy mineral assemblages (magnetite and other opaque material, hornblende, and pyroxenes), and the presence of glass shards and fragments of volcanic rocks in the coarser fractions indicate a pyroclastic origin. The material was transported by winds from source areas to the west and southwest.

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