FN Archimer Export Format
PT J
TI Enrichment of dissolved silica in the deep equatorial Pacific during the Eocene-Oligocene
BT 
AF FONTORBE, Guillaume
   FRINGS, Patrick J.
   DE LA ROCHA, Christina L.
   HENDRY, Katharine R.
   CARSTENSEN, Jacob
   CONLEY, Daniel J.
AS 1:1;2:1,2,3;3:1;4:4;5:5;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Lund Univ, Dept Geol, Lund, Sweden.
   Swedish Museum Nat Hist, Dept Geosci, Stockholm, Sweden.
   Helmholtz Ctr Potsdam, GFZ German Res Ctr Geosci, Earth Surface Geochem, Potsdam, Germany.
   Univ Bristol, Sch Earth Sci, Bristol, Avon, England.
   Aarhus Univ, Dept Biosci, Roskilde, Denmark.
C2 UNIV LUND, SWEDEN
   MNH SWEDEN, SWEDEN
   HELMHOLTZ CTR POTSDAM, GERMANY
   UNIV BRISTOL, UK
   UNIV AARHUS, DENMARK
IF 2.718
TC 23
UR https://archimer.ifremer.fr/doc/00395/50603/51313.pdf
   https://archimer.ifremer.fr/doc/00395/50603/51314.xlsx
LA English
DT Article
AB Silicon isotope ratios (expressed as δ30Si) in marine microfossils can provide insights into silica cycling over geologic time. Here we used δ30Si of sponge spicules and radiolarian tests from the Paleogene Equatorial Transect (Ocean Drilling Program Leg 199) spanning the Eocene and Oligocene (~50–23 Ma) to reconstruct dissolved silica (DSi) concentrations in deep waters and to examine upper ocean δ30Si. The δ30Si values range from −3.16 to +0.18‰ and from −0.07 to +1.42‰ for the sponge and radiolarian records, respectively. Both records show a transition toward lower δ30Si values around 37 Ma. The shift in radiolarian δ30Si is interpreted as a consequence of changes in the δ30Si of source DSi to the region. The decrease in sponge δ30Si is interpreted as a transition from low DSi concentrations to higher DSi concentrations, most likely related to the shift toward a solely Southern Ocean source of deep water in the Pacific during the Paleogene that has been suggested by results from paleoceanographic tracers such as neodymium and carbon isotopes. Sponge δ30Si provides relatively direct information about the nutrient content of deep water and is a useful complement to other tracers of deep water circulation in the oceans of the past. 
PY 2017
PD AUG
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 32
IS 8
UT 000409811500007
BP 848
EP 863
DI 10.1002/2017PA003090
ID 50603
ER

EF