KOPRI Repository

Geochemistry of peridotite xenoliths from the Sverrefjell Volcano, Western Spitsbergen: implications for mantle metasomatism

Metadata Downloads
Title
Geochemistry of peridotite xenoliths from the Sverrefjell Volcano, Western Spitsbergen: implications for mantle metasomatism
Other Titles
스피츠베르겐 스베르피엘 화산 맨틀포획암의 지구화학 조성과 맨틀 메타소마티즘 특성
Authors
Lee, Mi Jung
Han, Seung Hee
Moon, Jeong-Jin
Kim, Taehoon
Lee, Jong Ik
Issue Date
2015
Citation
Lee, Mi Jung, et al. 2015. Geochemistry of peridotite xenoliths from the Sverrefjell Volcano, Western Spitsbergen: implications for mantle metasomatism. Goldschmidt_2015. 체코 프라하 컨벤션센터. 2015.08.16~2015.08.21.
Abstract
Mantle xenoliths entrained in the Quaternary Sverrefjell volcano from Spitsbergen have been studied with the aim of understanding the nature of metasomatizing agents which affected the subcontinental lithospheric mantle beneath Spitsbergen. The suit of mantle xenoliths consists of spinel lherzolites, spinel harzburgites and websterites. The textures of all three rock types range from protogranular to porphyroclastic. Concentrations of Al2O3, CaO, TiO2 and Na2O decrease gradually from websterites through lherzolithes to harzburgites. LREE and other incompatible trace elements usually increase from depleted harzburgite to enriched lherzolites and websterites, indicating that metasomatism affected mainly the lherzolites and websterites. However, the exceptions are a few clinopyroxene patterns from harzburgites with mostly enriched LREEs imprinted by metasomatic processes. Clinopyroxenes show highly variable mantle normalized REE patterns but can be classified into four major groups showing: 1) LREE depleted to flat patterns (LaN/CeN 0.39-1.26 CeN/YbN 0.29-0.63 SmN/YbN 0.75-1.07), 2) spoon-shaped (MREE enriched) REE patterns (LaN/CeN 1.26-2.85 CeN/YbN 1.43-7.74 SmN/YbN 1.21-2.80), 3) highly enriched LREE and fractionated LREE/HREE patterns (LaN/CeN 0.83-1.24 CeN/YbN 5.57-24.68 SmN/YbN 1.30-6.60), and 4) LREE enriched and MREE depleted u-shaped patterns (LaN/CeN 1.92-2.02 CeN/YbN 4.53-5.29 SmN/YbN 0.35-0.49). Type 3 clinopyroxenes show trace element signatures produced by reaction of carbonate-rich fluids. Type 4 clinopyroxens are significantly enriched in U, Th, Pb, Zr and show U-shaped REE patterns, which may have been caused by subduction-related hydrous fluids or melts. The Sr-Nd-Pb isotopic compositions of clinopyroxenes show a gradual variation from depleted MORB (DMM) type 1 clinopyroxnes to very enriched type 2 and 3 clinopyroxenes.
URI
http://repository.kopri.re.kr/handle/201206/7145
Conference Name
Goldschmidt_2015
Conference Place
체코 프라하 컨벤션센터
Conference Date
2015.08.16~2015.08.21
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