Bulletin of Volcanology

, Volume 55, Issue 1–2, pp 74–84

Petrology of ultramafic and mafic xenoliths in picrite of Kahoolawe Island, Hawaii

  • E A Rudek
  • R V Fodor
  • G R Bauer
Article

Abstract

A picrite lava (22 wt% MgO; 35 vol.% ol) along the western shore of the∼1.3–1.4 Ma Kahoolawe tholeiitic shield, Hawaii, contains small xenoliths of harzburgite, lherzolite, norite, and wehrlite. The various rock types have textures where either orthopyroxene, clinopyroxene, or plagioclase is in a poikilitic relationship with olivine. The Mg#s of the olivine, orthopyroxene, and clinopyroxene in this xenolith suite range between 86 and 82; spinel Mg#s range from 60 to 49, and plagioclase is An75–80. A 87Sr/86Sr ratio for one ol-norite xenolith is 0.70444. In comparison, the host picrite has olivine phenocrysts with an average Mg# of 86.2 (range 87.5–84.5), and a whole-rock 87Sr/86Sr ratio of 0.70426. Textural and isotopic information together with mineral compositions indicate that the xenoliths are related to Kahoolawe tholeiitic magmatism, but are not crystallization products of the magma represented by their host picrite. Rather, the xenoliths are crystalline products of earlier primitive liquids (FeO/MgO ranging ∼1 to 1.3) at 5–9 kbar in the cumulate environment of a magma reservoir or conduit system. The presence of ultramafic xenoliths in picrite but not in typical Kahoolawe tholeiitic lava (6–9 wt% MgO) is consistent with replenishment of reservoirs by dense Mg-rich magma emplaced beneath resident, less dense tholeiitic magma. Mg-rich magmas have proximity to reservoir cumulate zones and are therefore more likely than fractionated residual liquids to entrain fragments of cumulate rock.

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • E A Rudek
    • 1
  • R V Fodor
    • 1
  • G R Bauer
    • 2
  1. 1.Department of Marine, Earth, and Atmospheric SciencesNorth Carolina State UniversityRaleighUSA
  2. 2.Department of Land and Natural ResourcesHonoluluUSA
  3. 3.Sirrine Environmental ConsultantsFremont

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