Unknown
PANGAEA
In:
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, https://doi.org/10.2973/dsdp.proc.94.129.1987
Publication Date:
2023-06-27
Description:
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.
Keywords:
94-609; 94-609B; Counting 〉125 µm fraction; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Foraminifera, benthic; Globigerina apertura; Globigerina bulloides; Globigerina decoraperta; Globigerina eamesi; Globigerina falconensis; Globigerina nepenthes; Globigerina quinqueloba; Globigerina woodi; Globigerinella aequilateralis; Globigerinella calida; Globigerinita glutinata; Globigerinita uvula; Globigerinoides obliquus; Globigerinoides quadrilobatus; Globigerinoides ruber; Globigerinoides trilobus; Globorotalia cibaoensis; Globorotalia conoidea; Globorotalia crassaformis; Globorotalia crassula; Globorotalia hirsuta; Globorotalia inflata; Globorotalia margaritae; Globorotalia puncticulata; Globorotalia scitula; Globorotalia sphericomiozea; Glomar Challenger; Leg94; Neogloboquadrina acostaensis dextral; Neogloboquadrina acostaensis sinistral; Neogloboquadrina atlantica dextral; Neogloboquadrina atlantica sinistral; Neogloboquadrina continuosa; Neogloboquadrina dutertrei; Neogloboquadrina humerosa; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; North Atlantic/FLANK; Orbulina suturalis; Orbulina universa; Sample, optional label/labor no; Sample code/label; Siliceous microfossils; Sphaeroidinellopsis seminulina; Sphaeroidinellopsis sp.
Type:
Dataset
Format:
text/tab-separated-values, 5456 data points
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