Publication Date:
2022-05-25
Description:
Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Earth and Planetary Science Letters 290 (2010): 340-350, doi:10.1016/j.epsl.2009.12.030.
Description:
Paired radiocarbon measurements on haptophyte biomarkers (alkenones) and on cooccurring
tests of planktic foraminifera (Neogloboquadrina dutertrei and Globogerinoides
sacculifer) from late glacial to Holocene sediments at core locations ME0005-24JC, Y69-
71P, and MC16 from the south-western and central Panama Basin indicate no significant
addition of pre-aged alkenones by lateral advection. The strong temporal correspondence
between alkenones, foraminifera and total organic carbon (TOC) also implies negligible
contributions of aged terrigenous material. Considering controversial evidence for
sediment redistribution in previous studies of these sites, our data imply that the laterally
supplied material cannot stem from remobilization of substantially aged sediments.
Transport, if any, requires syn-depositional nepheloid layer transport and redistribution
of low-density or fine-grained components within decades of particle formation. Such
rapid and local transport minimizes the potential for temporal decoupling of proxies
residing in different grain size fractions and thus facilitates comparison of various proxies
for paleoceanographic reconstructions in this study area. Anomalously old foraminiferal
tests from a glacial depth interval of core Y69-71P may result from episodic spillover of
fast bottom currents across the Carnegie Ridge transporting foraminiferal sands towards
the north.
Description:
This study was funded by the Helmholtz Young Investigators Group „Applications of
molecular 14C analysis for the study of sedimentation processes and carbon cycling in
marine sediments”. G.M.
acknowledges financial support from WHOI postdoctoral scholarship program. T.I.E. was
supported by NSF grant OCE-0526268. A.C.M. was supported by NSF grant ATM0602395.
Keywords:
Compound-specific radiocarbon dating
;
Alkenones
;
Lateral sediment transport
;
Panama Basin
;
Eastern Equatorial Pacific
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
Format:
application/pdf
Permalink
