FN Archimer Export Format
PT J
TI Sensitivity of clumped isotope temperatures in fossil benthic and planktic foraminifera to diagenetic alteration
BT 
AF Leutert, Thomas J.
   Sexton, Philip F.
   Tripati, Aradhna
   Piasecki, Alison
   Ling Ho, Sze
   Nele Meckler, A.
AS 1:1;2:2;3:3,4,5;4:1,6;5:1,7;6:1;
FF 1:;2:;3:;4:;5:;6:;
C1 Bjerknes Centre for Climate Research and Department of Earth Science, University of Bergen, 5007 Bergen, Norway
   School of Environment, Earth & Ecosystem Sciences, The Open University, Milton Keynes MK7 6AA, UK
   Department of Earth, Planetary, and Space Sciences, Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, Center for Diverse Leadership in Science, University of California, Los Angeles, CA 90095, USA
   European Institute of Marine Sciences (IUEM), Université de Brest, UMR 6538, Domaines Océaniques, Rue Dumont D’Urville, and IFREMER, Laboratoire Géophysique et enregistrement Sédimentaire, 29280 Plouzané, France
   European Institute of Marine Sciences (IUEM), Université de Brest, UMR 6538, Domaines Océaniques, Rue Dumont D’Urville, and IFREMER, Laboratoire Géophysique et enregistrement Sédimentaire, 29280 Plouzané, France
   Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA
   Institute of Oceanography, National Taiwan University, 10617 Taipei, Taiwan
C2 BCCR, NORWAY
   UNIV OPEN, UK
   UNIV CALIF LOS ANGELES, USA
   UBO, FRANCE
   IFREMER, FRANCE
   UNIV HARVARD, USA
   UNIV NATL TAIWAN NTU, TAIWAN
SI BREST
SE PDG-REM-GM-LCG
UM LGO
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 4.659
TC 25
UR https://archimer.ifremer.fr/doc/00495/60683/64757.pdf
   https://archimer.ifremer.fr/doc/00495/60683/64759.pdf
   https://archimer.ifremer.fr/doc/00495/60683/64760.pdf
   https://archimer.ifremer.fr/doc/00495/60683/64761.xlsx
   https://archimer.ifremer.fr/doc/00495/60683/64762.xls
LA English
DT Article
DE ;Clumped isotopes;Foraminifera;Diagenesis;Eocene;Stable-isotope geochemistry;Preservation
AB Applying the clumped isotope (Δ47) thermometer to foraminifer microfossils offers the potential to significantly improve paleoclimate reconstructions, owing to its insensitivity to the isotopic composition of seawater (unlike traditional oxygen isotope (δ18O) analyses). However, the extent to which primary Δ47 signatures of foraminiferal calcites can be overprinted during diagenesis is not well known. Here, we present Δ47 data as well as high-resolution (∼10 kyr) δ18O and δ13C middle Eocene time series, measured on benthic and planktic foraminifera from ODP/IODP Sites 1408, 1409, 1410, 1050, 1260 and 1263 in the Atlantic Ocean. The sites examined span various oceanographic regimes, including the western tropical to mid-latitude North Atlantic, and the eastern mid-latitude South Atlantic. Comparing data from contemporaneous foraminifera with different preservation states, we test the effects of diagenetic alteration on paleotemperature reconstructions for the deep and surface ocean. We find that overall, primary Δ47 signatures appear similarly sensitive to diagenetic overprinting as δ18O, with differences in sensitivity depending on pore fluid chemistry and the amount of secondary calcite. Where planktic foraminifera are significantly altered, sea surface temperatures derived from Δ47 and δ18O values are biased towards cool temperatures. In comparison, Δ47 and δ18O values of benthic and well preserved planktic foraminifera are less affected by diagenesis and thus likely to yield robust foraminiferal calcification temperatures. With independent estimates of diagenetic calcite fractions, secondary overprints could be corrected for, using end-member modeling and Δ47-based temperatures from benthic foraminifera. 
PY 2019
PD JUN
SO Geochimica Et Cosmochimica Acta
SN 0016-7037
PU Elsevier BV
VL 257
UT 000470830800021
BP 354
EP 372
DI 10.1016/j.gca.2019.05.005
ID 60683
ER

EF