Late Eocene diatomite from the Peruvian coastal desert, coastal upwelling in the eastern Pacific, and Pacific circulation before the terminal Eocene event
Journal Article
·
· Geology; (United States)
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.
- Research Organization:
- Rice Univ., Houston, TX (USA)
- OSTI ID:
- 6860857
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 16:9; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Circum-Pacific diatomite deposits
Late paleogene (eocene to oligocene) paleoceanography of the northern North Atlantic. Doctoral thesis
Mixing of biogenic siliceous and terrigenous clastic sediments: South Belridge field and Beta field, California
Conference
·
Tue Jul 01 00:00:00 EDT 1986
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:7053364
Late paleogene (eocene to oligocene) paleoceanography of the northern North Atlantic. Doctoral thesis
Technical Report
·
Sun Oct 31 23:00:00 EST 1982
·
OSTI ID:6762680
Mixing of biogenic siliceous and terrigenous clastic sediments: South Belridge field and Beta field, California
Conference
·
Tue May 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:6634883
Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CENOZOIC ERA
CHERT
DEVELOPING COUNTRIES
DIATOMACEOUS EARTH
EOCENE EPOCH
FOSSILS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC MODELS
GEOLOGY
LATIN AMERICA
OXYGEN COMPOUNDS
PACIFIC OCEAN
PERU
ROCKS
SEAS
SEDIMENTARY ROCKS
SEDIMENTS
SOUTH AMERICA
STRATIGRAPHY
SURFACE WATERS
TERTIARY PERIOD
UPWELLING
580100* -- Geology & Hydrology-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CENOZOIC ERA
CHERT
DEVELOPING COUNTRIES
DIATOMACEOUS EARTH
EOCENE EPOCH
FOSSILS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC MODELS
GEOLOGY
LATIN AMERICA
OXYGEN COMPOUNDS
PACIFIC OCEAN
PERU
ROCKS
SEAS
SEDIMENTARY ROCKS
SEDIMENTS
SOUTH AMERICA
STRATIGRAPHY
SURFACE WATERS
TERTIARY PERIOD
UPWELLING