(Table 1) Planktonic foraminiferal communities at DSDP Holes 94-609B and 94-609 ...

• Main Authors: Hooper, P W P, Weaver, Philip PE
• Format: Dataset
• Language: English
• Published: PANGAEA 1987
• Subjects: Event label; Sample code/label; Sample, optional label/labor no; DEPTH, sediment/rock; Globigerina quinqueloba; Globigerina eamesi; Globigerina bulloides; Globigerina falconensis; Globigerina woodi; Globigerina apertura; Globigerina nepenthes; Globigerina decoraperta; Globigerinoides obliquus; Globigerinoides trilobus; Globigerinoides quadrilobatus; Globigerinoides ruber; Orbulina universa; Orbulina suturalis; Globorotalia conoidea; Globorotalia sphericomiozea; Globorotalia puncticulata; Globorotalia inflata; Globorotalia scitula; Globorotalia cibaoensis; Globorotalia margaritae; Globorotalia hirsuta; Globorotalia crassula; Globorotalia crassaformis; Neogloboquadrina continuosa; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; Neogloboquadrina acostaensis dextral; Neogloboquadrina acostaensis sinistral; Neogloboquadrina humerosa; Neogloboquadrina dutertrei; Neogloboquadrina atlantica dextral; Neogloboquadrina atlantica sinistral; Sphaeroidinellopsis seminulina; Sphaeroidinellopsis sp.; Globigerinita glutinata; Globigerinita uvula; Globigerinella aequilateralis; Globigerinella calida; Foraminifera, benthic; Siliceous microfossils; Drilling/drill rig; DSDP/ODP/IODP sample designation; Counting >125 µm fraction; Leg94; Glomar Challenger; Antarctic; Kidd; Weaver; Antarc*; Neogloboquadrina pachyderma; North Atlantic Deep Water; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.788916; https://doi.pangaea.de/10.1594/PANGAEA.788916

The planktonic foraminifers in 124 samples from Holes 609 and 609B have been analyzed quantitatively to see whether oceanographic events in the late Miocene and early Pliocene (6.5-4.0 Ma) are reflected in the distribution of individual species. Major changes in sea-surface temperature and bottom-water circulation are postulated, mainly on the basis of the coiling-direction ratios in Neogloboquadrina pachyderma (Ehrenberg) and a dissolution index. A cool interval peaking at around 6.2 Ma was followed by climatic fluctuations, possibly indicative of glacial cycles, before a general warming in the Pliocene. Intense dissolution of CaCO3 at this site on both sides of the Miocene/Pliocene boundary is inferred to have resulted from the presence of Antarctic Bottom Water, and an influx of less aggressive North Atlantic Deep Water is indicated at the actual boundary. These climatic and oceanographic changes are tentatively linked to the Messinian salinity crisis in the Mediterranean. ... : Supplement to: Hooper, P W P; Weaver, Philip PE (1987): Paleoceanographic significance of late Miocene to early Pliocene planktonic foraminifers at Deep Sea Drilling Project Site 609. In: Ruddiman, WF; Kidd, RB; Thomas, E; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 94, 925-934 ...