KOPRI Repository

Volatile systematics of the Lau Basin - resolving the effects of source variation, magmatic degassing and crustal contamination

Metadata Downloads
Title
Volatile systematics of the Lau Basin - resolving the effects of source variation, magmatic degassing and crustal contamination
Other Titles
Volatile systematics of the Lau Basin - resolving the effects of source variation, magmatic degassing and crustal contamination
Authors
Hahm, Doshik
Erik H. Hauri
Paterno R. Castillo
Barry B. Hanan
James W. Hawkins
David R. Hilton
Keywords
Lau Basin; carbon isotope; helium isotope; noble gas; volatiles
Issue Date
2011
Citation
Hahm, Doshik, et al. 2011. Volatile systematics of the Lau Basin - resolving the effects of source variation, magmatic degassing and crustal contamination. 한국과학기술총연합회. 한국과학기술총연합회. 2011.12.01~.
Abstract
The Lau Basin erupts lavas with a range of geochemical features reflecting a complex history of interaction involving different mantle sources. The Valu Fa Ridge (VFR) and Mangatolu Triple Junction (MTJ) region has lavas with arc-like characteristics, Niuafo’ ou Island (NV), Peggy Ridge and Central and Eastern Lau Spreading Centers (PR, CLSC and ELSC) erupt mid-ocean ridge basalt (MORB)-like volcanics, whereas the Rochambeau Bank (RB) has features akin to ocean island basalt (OIB). To characterize the volatile systematics of these various regions, we report a comprehensive study of 39 submarine lavas from these various eruptive centers encompassing analyses of the noble gases (He, Ne, and Ar) and carbon (CO2) – both isotopes and abundances - together with other major volatile phases (H2O, S, Cl, and F). Helium isotope ratios of the NV, MTJ, CLSC, and ELSC are MORB-like for the most part except for differentiated lavas that tend to have lower, more radiogenic 3He/4He values. The RB has considerably higher 3He/4He ratios (up to 23 RA in this work) which extend as far south as the PR. The influence of ‘plume-like’ sources in the RB is also apparent in Ne isotopes: RB samples follow a trend similar to Hawaiian basalts in 3- isotope neon space. However, RB lavas have lower 40Ar/36Ar (300-730) and higher [36Ar] than CLSC and ELSC, suggesting greater air contamination. Elemental He/Ne
URI
http://repository.kopri.re.kr/handle/201206/8452
Conference Name
한국과학기술총연합회
Conference Place
한국과학기술총연합회
Conference Date
2011.12.01~
Files in This Item
General Conditions
      ROMEO Green
    Can archive pre-print and post-print or publisher's version/PDF
      ROMEO Blue
    Can archive post-print (ie final draft post-refereeing) or publisher's version/PDF
      ROMEO Yellow
    Can archive pre-print (ie pre-refereeing)
      ROMEO White
    Archiving not formally supported

    qrcode

    Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

    Browse