Neogene turbidite deposition in an island hot-spot setting in the Canary Islands; paleoenvironmental clues from benthonic foraminifers

Author(s): Brunner, Charlotte A.; Kuttner, Sherry; Schneider, Jean-Luc
Author Affiliation(s): Primary:
University of Southern Mississippi, Institute of Marine Sciences, Stennis Space Center, MS, United States
Other:
Université Sciences et Techniques de Lille, France
Volume Title: Geological Society of America, 28th annual meeting
Source: Abstracts with Programs - Geological Society of America, 28(7), p.43-44; Geological Society of America, 28th annual meeting, Denver, CO, Oct. 28-31, 1996. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: Turbidite deposition in the mid-plate, hot-spot setting of the Canary Islands is controlled not only by local volcanism, but by sea level fluctuations and regional climate. We examined 25 turbidites from the Late Miocene to the Quaternary at ODP Site 953, which lies on the northeast edge of the volcanic apron of Gran Canaria at 3485 m in a small basin that is sheltered from turbidite input from the nearby Moroccan continental margin. The site is composed of volcaniclastic and biogenic carbonate turbidites interlayered with pelagic sequences that provide excellent age control.Benthonic foraminifers were identified and assigned to depth zones according to their depth preferences on the northwest African continental margin. All turbidites contain a mixture of specimens from neritic, upper, middle, and lower bathyal, and abyssal depth zones. Late Miocene and Early Pliocene turbidites are dominated by an upper bathyal assemblage from 130 to 1000 m water depth. Late Pliocene and Quaternary volcaniclastic-rich turbidites are also dominated by an upper bathyal assemblage, but the species composition is different. The younger turbidite sequence bears another significant difference. Thick biogenic carbonate turbidites composed of neritic fossils first appear at about 3 Ma and become common in the Quaternary interval. The changes in turbidite faunas between the Early and Late Pliocene are connected to environmental changes brought on by global cooling beginning 2.8 Ma. Effects include altered bathyal-depth water properties and structure that affect bathyal assemblages; increased aridity reducing clastic sediment supply to the island shelf; and increased sea level fluctuations, which caused sediment starvation on the shelf during highstands when temperate carbonate producers flourished.
Year of Publication: 1996
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Atlantic Ocean Islands; Benthic taxa; Canary Islands; Cenozoic; Cooling; Deposition; Foraminifera; Grand Canary; Hot spots; Invertebrata; Leg 157; Marine environment; Microfossils; Miocene; Neogene; ODP Site 953; Ocean Drilling Program; Paleoclimatology; Paleoenvironment; Plate tectonics; Pliocene; Protista; Quaternary; Sea-level changes; Sediment supply; Shelf environment; Tertiary; Turbidite; Upper Miocene; Volcaniclastics; Volcanism
Coordinates: N283901 N283901 W0150841 W0150841
Record ID: 1997044591
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