(Table T1) Cenozoic and Mesozoic biostratigraphic datums of ODP Hole 210-1276A

Sediments recovered from Ocean Drilling Program Leg 210 Hole 1276A range in age from Early Cretaceous (earliest Albian) to Paleogene (earliest Oligocene). In this study, samples were processed and analyzed for micropaleontological and palynological content, as well as sedimentary components. Core re...

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Bibliographic Details
Main Authors: Urquhart, Elspeth, Gardin, Silvia, Leckie, R Mark, Wood, S A, Pross, Jörg, Georgescu, Marius Dan, Ladner, Bryan, Takata, Hiroyuki
Format: Dataset
Language:English
Published: PANGAEA 2007
Subjects:
210-1276A
Age model
Ageprofile Datum Description
Depth
bottom/max
sediment/rock
top/min
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Joides Resolution
Leg210
Ocean Drilling Program
ODP
Sample code/label
Sample code/label 2
Sample comment
South Atlantic Ocean
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.776761
https://doi.org/10.1594/PANGAEA.776761
Description
Summary:Sediments recovered from Ocean Drilling Program Leg 210 Hole 1276A range in age from Early Cretaceous (earliest Albian) to Paleogene (earliest Oligocene). In this study, samples were processed and analyzed for micropaleontological and palynological content, as well as sedimentary components. Core recovery from this site was good (85% between 800 and 1725.16 meters below seafloor), and the majority of samples processed yielded microfossils of some nature. Although none of the major groups are consistently present in all samples, calcareous nannofossils, agglutinated benthic foraminifers, and radiolarians do occur in many samples. The best age constraints for Hole 1276A are provided by calcareous nannofossils and dinoflagellate cysts. Age-diagnostic planktonic foraminifers are more commonly found in redeposited turbidite sandstones rather than in the autochthonous pelagic mudrocks. The depositional environments of the sediments have been interpreted as varying in oxygenation but having been deposited at abyssal depths (>2000 m) near or below the calcite carbonate depth (CCD). Almost uninterrupted deepwater deposition since the Aptian is evidenced both by the evolutionary succession of biota recovered from the sediments and by the sedimentary history of turbidites and gravity flow deposits derived from neritic and bathyal sources on the adjacent margin. A condensed interval recorded in the Turonian-Maastrichtian is likely associated with sediment starvation at times of high global sea level. A disconformity and condensed interval in the lower middle Eocene (~48.5-43.7 Ma) is associated with a change in global sea level and may be associated with invigorated deepwater current activity. Anoxic conditions affected the deep seafloor of the North Atlantic during Oceanic Anoxic Event (OAE) 1b (earliest Albian, ~112 Ma) and OAE2 (Cenomanian-Turonian boundary interval, ~93.5 Ma). Cooling during the early Turonian followed the vast carbon burial associated with OAE2 based on calcareous nannofossil assemblages. The ...

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