Ando, Atsushi et al. (2010): Testing seawater Sr isotopic variability on a glacial-interglacial timescale; an application of latest high-precision thermal ionization mass spectrometry
Leg/Site/Hole:
Related Expeditions:
DSDP 62
Identifier:
ID:
2011-047941
Type:
georefid
Creator:
Name:
Ando, Atsushi
Affiliation:
Research Institute for Humanity and Nature, Kyoto, Japan
Role:
author
Name:
Nakano, Takanori
Affiliation:
Pusan National University, South Korea
Role:
author
Name:
Kawahata, Hodaka
Affiliation:
University of Tokyo, Japan
Role:
author
Name:
Yokoyama, Yusuke
Affiliation:
Japan Agency for Marine-Earth Science and Technology, Japan
Role:
author
Name:
Khim, Boo-Keun
Affiliation:
Role:
author
Identification:
Title:
Testing seawater Sr isotopic variability on a glacial-interglacial timescale; an application of latest high-precision thermal ionization mass spectrometry
Year:
2010
Source:
Geochemical Journal
Publisher:
Geochemical Society of Japan, Nagoya, Japan
Volume:
44
Issue:
5
Pages:
347-357
Abstract:
Stability in seawater (super 87) Sr/ (super 86) Sr ratios over a glacial-interglacial timescale has gained the consensus, yet inter-site inconsistency exists in the previous data employed for validation of this issue. This study tests if the use of state-of-the-art Thermo Finnigan (super TM) TRITON multi-collector thermal ionization mass spectrometer (TIMS) can place more rigorous constraints on the seawater (super 87) Sr/ (super 86) Sr evolution at such a narrow timescale, by utilizing modern seawater, benthic foraminifera (150 ka-present) and corals (30 ka-present) (all sampled from the western Pacific realm). Application of a high-intensity setting (mass (super 88) Sr beam at 20 V) with internal and external precisions of + or -0.000005 (2 SE) and + or -0.000006 (2 SD), respectively, generates remarkably consistent 150 ka record of seawater Sr isotopes, such that 94.4% of foraminiferal (super 87) Sr/ (super 86) Sr data fall within a + or -0.000006 envelope relative to a regression function. Undoubtedly the 150 ka (super 87) Sr/ (super 86) Sr trend exhibits no short-term, orbitally-paced variation. Meanwhile, unlike previous inference, our (super 87) Sr/ (super 86) Sr record cannot be attributed to a simple linear function, implying that higher-order, minor (amplitude < or =0.000010) (super 87) Sr/ (super 86) Sr oscillation might have been present on the timescale greater than glacial-interglacial cycle. Our observations are demonstrative data-based verification and improvement upon previous knowledge of the glacial-interglacial seawater (super 87) Sr/ (super 86) Sr ratios. We emphasize that high-precision (super 87) Sr/ (super 86) Sr analysis with the TRITON TIMS certainly enables us to discriminate minute Sr isotopic details of (paleo-)oceanographic significance.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:32.1950 West:157.5100 East:
174.4004 South:21.2101
Keywords: Isotope geochemistry; alkaline earth metals; Anthozoa; benthic taxa; Cenozoic; Cnidaria; Deep Sea Drilling Project; DSDP Site 463; Foraminifera; glacial-interglacial cycles; Invertebrata; IPOD; isotope ratios; isotopes; Leg 62; marine sediments; mass spectra; metals; microfossils; Mid-Pacific Mountains; North Pacific; Northwest Pacific; oscillations; Pacific Ocean; paleo-oceanography; Pleistocene; precision; Protista; Quaternary; sea water; sediments; Shatsky Rise; spectra; Sr-87/Sr-86; stable isotopes; strontium; thermal ionization mass spectra; West Pacific;
.