Origins and palaeoceangraphic significance of laminated diatom ooze from the eastern Equatorial Pacific Ocean

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doi: 10.1144/GSL.SP.1996.116.01.19
Author(s): Kemp, Alan E. S.; Baldauf, Jack G.; Pearce, Richard B.
Author Affiliation(s): Primary:
University of Southampton, Department of Oceanography, Southampton, United Kingdom
Texas A&M University, United States
Volume Title: Palaeoclimatology and palaeoceanography from laminated sediments
Volume Author(s): Kemp, Alan E. S., editor
Source: Palaeoclimatology and palaeoceanography from laminated sediments, edited by Alan E. S. Kemp. Geological Society Special Publications, Vol.116, p.243-252. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719. ISBN: 1-897799-67-5 CODEN: GSLSBW
Note: In English. 45 refs.; illus., incl. sketch maps
Summary: Laminated diatom ooze (LDO) has been recovered from several ODP Leg 138 sites and now is also recognized from several DSDP Leg 85 sites. These remarkable sediments are the result of massive and episodic flux of mats of the diatom Thalassiothrix longissima. By analogy with the Rhizosolenia diatom mat-forming events monitored by JGOFS (Joint Global Ocean Flux Study) in the equatorial Pacific Ocean during cooling conditions in late 1992, these episodes of massive flux of T. Iongissima mats may represent the 'fall out' from major frontal systems generated during La Nina (anti-El Nino) events. Laminations were preserved in the mat deposits because of the rapid mat deposition and high strength of the diatom mat meshwork, that subjugated benthic activity. This new mechanism of preservation of lamination in marine sediments has wide implications for other laminated sequences. The sustained periods of mat deposition documented in Neogene sediments of the eastern equatorial Pacific Ocean are part of the major cycles in the relative abundance of carbonate and silica in the region and, possibly, in the case of some intervals, also in the Atlantic Ocean.
Year of Publication: 1996
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Algae; Algal mats; Algal structures; Biogenic structures; Cenozoic; Clastic sediments; Climate; Deep Sea Drilling Project; Diatoms; Equatorial Pacific; Holocene; IGCP; IPOD; Laminations; Leg 138; Leg 85; Marine sedimentation; Microfossils; Modern analogs; Ocean Drilling Program; Ooze; Pacific Ocean; Planar bedding structures; Plantae; Quaternary; Sedimentary structures; Sedimentation; Sediments
Coordinates: S030548 N111326 W0902851 W1103419
N002954 N055100 W1135030 W1332010
Record ID: 2010058121
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