Sato, H. et al. (2002): Geochemical and isotopic characteristics of the Kinan seamount chain in the Shikoku Basin

Leg/Site/Hole:
DSDP 58
DSDP 58 444
Identifier:
2006-002208
georefid
Creator:
Sato, H.
University of Tokyo, Ocean Research Institute, Tokyo, Japan
author
Machida, S.
Yamagata University, Japan
author
Kanayama, S.
Komazawa University, Japan
author
Taniguchi, H.
author
Ishii, T.
author
Identification:
Geochemical and isotopic characteristics of the Kinan seamount chain in the Shikoku Basin
2002
Geochemical Journal
Geochemical Society of Japan, Nagoya, Japan
36
5
519-526
The Kinan Seamount Chain lies close to the extinct spreading center of the Shikoku Basin, one of the largest marginal basins in the western Pacific region. Geochemical and isotopic analyses reveal that basalts from the Kinan Seamount Chain have the following characteristics that differ from the Shikoku Basin tholeiite: 1) more incompatible element enriched compositions, 2) lower abundance of the heavy rare earth elements (HREE), and 3) higher (super 87) Sr/ (super 86) Sr and lower (super 143) Nd/ (super 144) Nd ratios. These results indicate: 1) a more enriched mantle source for basalts from the Kinan Seamount Chain, 2) existence of clinopyroxene and/or amphibole in their residual mantle, and 3) mixing of magmas from a normal MORB source with the EMI signature and an ocean-island basalt (OIB) source with the EMII signature; and 4) the latter has a more significant contribution to the Kinan Seamount Chain basalts than the Shikoku Basin tholeiite.
English
Serial
Coverage:Geographic coordinates:
North:28.3815
West:137.4102East: 137.4102
South:28.3815
Isotope geochemistry; Igneous and metamorphic petrology; alkaline earth metals; amphibole group; back-arc basins; basalts; basins; chain silicates; clinopyroxene; Deep Sea Drilling Project; DSDP Site 444; geochemistry; igneous rocks; incompatible elements; IPOD; isotope ratios; isotopes; Kinan seamount chain; Leg 58; magmas; mantle; marginal basins; mass spectra; metals; mid-ocean ridge basalts; mixing; Nd-144/Nd-143; neodymium; North Pacific; Northwest Pacific; ocean-island basalts; Pacific Ocean; Philippine Sea Plate; plate tectonics; provenance; pyroxene group; rare earths; sea-floor spreading; seamounts; Shikoku Basin; silicates; spectra; spreading centers; Sr-87/Sr-86; stable isotopes; strontium; thermal ionization mass spectra; tholeiitic basalt; upwelling; volcanic rocks; West Pacific;
.