FN Archimer Export Format
PT J
TI Single foraminifera Mg/Ca analyses of past glacial-interglacial temperatures derived from G. ruber sensu stricto and sensu lato morphotypes
BT 
AF Schmitt, A.
   Elliot, M.
   Thirumalai, K.
   La, C.
   Bassinot, F.
   Petersen, J.
   Movellan, A.
   Jorry, Stephan
   Borgomano, J.
AS 1:1;2:1;3:2;4:1;5:3;6:1;7:1,4;8:5;9:6;
FF 1:;2:;3:;4:;5:;6:;7:;8:PDG-REM-GM-LGS;9:;
C1 Laboratoire de Planétologie et Géodynamique UMR 6112, 44300 Nantes, France
   DEEPS, Brown University, 02912, RI, USA
   LSCE, 91191 Gif sur Yvette, France
   Ocean Zoom, 44300 Nantes, France
   IFREMER, 29280 Plouzané, France
   CEREGE-CNRS, 13545 Aix en Provence, France
C2 UNIV NANTES, FRANCE
   UNIV BROWN, USA
   CEA, FRANCE
   OCEAN ZOOM, FRANCE
   IFREMER, FRANCE
   CNRS, FRANCE
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 3.362
TC 14
UR https://archimer.ifremer.fr/doc/00472/58336/60890.pdf
LA English
DT Article
DE ;Globigerinoides ruber;Mg/Ca ratio;Sea surface temperature;LA-ICPMS;Seasonality;Quaternary
AB The ratio of magnesium to calcium (Mg/Ca) in foraminiferal shells is commonly used as a proxy for past ocean temperature. Recent advances in elemental analyses now enable single-specimen measurements of planktic foraminifera and thus, can provide information on past seasonal and interannual variability, owing to the near-monthly lifespan of foraminifera. In this study, we explore the temperature variance recorded by Mg/Ca in tests of foraminifera Globigerinoides ruber, a planktic species that occurs throughout the year in tropical waters. Using LA-ICP-MS, we characterize Mg/Ca variability in single specimens of two morphotypes of G. ruber picked from a sediment core retrieved offshore New Caledonia. We provide an estimate of the range of calcification temperatures for these morphotypes during five interglacial-glacial cycles over the last 1.55 Ma. First, we find significant and systematic differences between the morphotypes and second, the temperature difference between morphotypes does not remain constant through time. Our results highlight a progressive increase in surface-water temperatures during interglacials and a progressive decrease in glacial subsurface water temperatures. These changes in surface and subsurface temperatures potentially highlight a change in the stratification of the water column over the Mid-Pleistocene Transition. We conclude that single-specimen Mg/Ca on foraminiferal morphotypes can offer unique perspectives on paleoenvironmental reconstructions. 
PY 2019
PD APR
SO Chemical Geology
SN 0009-2541
PU Elsevier BV
VL 511
UT 000462772400036
BP 510
EP 520
DI 10.1016/j.chemgeo.2018.11.007
ID 58336
ER

EF