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Title Late Eocene diatomite from the Peruvian coastal desert, coastal upwelling in the eastern Pacific, and Pacific circulation before the terminal Eocene event
Creator/Author Marty, R. ; Dunbar, R. ; Martin, J.B. ; Baker, P.
Publication Date1988 Sep 01
OSTI IdentifierOSTI ID: 6860857
Other Number(s)CODEN: GLGYB
Resource TypeJournal Article
Resource RelationGeology ; Vol/Issue: 16:9
Research OrgRice Univ., Houston, TX (USA)
Subject580100 -- Geology & Hydrology-- (-1989); GEOLOGIC DEPOSITS-- GEOLOGIC HISTORY;PERU-- GEOLOGIC DEPOSITS; CALCIUM CARBONATES;CHERT;DIATOMACEOUS EARTH;EOCENE EPOCH;FOSSILS;GEOLOGIC MODELS;PACIFIC OCEAN;SEDIMENTS;STRATIGRAPHY;UPWELLING
Related SubjectALKALINE EARTH METAL COMPOUNDS;CALCIUM COMPOUNDS;CARBON COMPOUNDS;CARBONATES;CENOZOIC ERA;DEVELOPING COUNTRIES;GEOLOGIC AGES;GEOLOGY;LATIN AMERICA;OXYGEN COMPOUNDS;ROCKS;SEAS;SEDIMENTARY ROCKS;SOUTH AMERICA;SURFACE WATERS;TERTIARY PERIOD
Description/Abstract Previously undocumented late Eocene diatomaceous sediments are present near Fundo Desbarrancado (FD) in southern Peru.^These sediments are similar to Miocene diatomite from the same area but, unlike the Miocene diatomite, the FD sediments contain cherty layers, are enriched in CaCO/sub 3/, have a diverse and abundant radiolarian fauna, and possess varved-massive and millimeter- and meter-scale biogenic-terrigenous alternations.^The FD sediments are part of an Eocene sequence that includes the clastic sediments of the Paracas Formation, and they are correlative to the Chira Formation of northern Peru.^The Paleogene biogenic sediments of western South America show that coastal upwelling developed in the eastern Pacific before the latest Eocene, argue for the existence of a proto-Humboldt current at this time, and suggest that the terminal Eocene event was the culmination of gradual changes and not a catastrophic event at the Eocene/Oligocene boundary.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 818-822
System Entry Date2001 May 13

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