Bibliographic Citation
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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 Date | 1988 Sep 01 |
OSTI Identifier | OSTI ID: 6860857 |
Other Number(s) | CODEN: GLGYB |
Resource Type | Journal Article |
Resource Relation | Geology ; Vol/Issue: 16:9 |
Research Org | Rice Univ., Houston, TX (USA) |
Subject | 580100 -- 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 Subject | ALKALINE 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 Publication | United States |
Language | English |
Format | Pages: 818-822 |
System Entry Date | 2001 May 13 |
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