FN Archimer Export Format
PT J
TI Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone
BT 
AF BARKER, Stephen
   BROECKER, Wallace
   CLARK, Elizabeth
   HAJDAS, Irka
AS 1:1;2:2;3:2;4:3;
FF 1:;2:;3:;4:;
C1 Cardiff Univ, Sch Earth Ocean & Planetary Sci, Cardiff CF10 3YE, Wales.
   Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA.
   ETH Honggerberg, IPP, AMS Lab 14C, CH-8093 Zurich, Switzerland.
C2 UNIV CARDIFF, UK
   UNIV COLUMBIA, USA
   ETH ZURICH, SWITZERLAND
IF 3.391
TC 62
UR https://archimer.ifremer.fr/doc/00238/34943/33247.pdf
LA English
DT Article
CR IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
BO Marion Dufresne
DE ;adiocarbon dating;dissolution;fragmentation
AB Shells of coexisting species of planktonic foraminifera from the Ontong Java Plateau reveal radiocarbon age offsets of up to 2200 years. Similar offsets are found between fragments and whole shells of single species. Steady state modelling of dissolution and bioturbation within the sedimentary mixed layer predicts age differences of up to several kiloyears due to the interplay between differential dissolution and fragmentation of foraminifer shells and bioturbation. The observation that fragile foraminiferal shells are systematically older than those of more robust species is more difficult to explain. Mechanisms of chemical erosion, interface dissolution, and sediment redistribution are all apparently unable to explain this phenomenon. A possible solution is presented in which a particular species may be represented by two distinct classes of shells which are more or less robust. In this case, differential dissolution and fragmentation causes an increase in the mean age as the fragile class contributes less to the remaining intact shells. This study highlights the vulnerability of low sedimentation rate cores to the effects of dissolution and bioturbation.
PY 2007
PD MAY
SO Paleoceanography
SN 0883-8305
PU Amer Geophysical Union
VL 22
IS 2/PA2205
UT 000246308600002
BP 1
EP 11
DI 10.1029/2006PA001354
ID 34943
ER

EF