Bulletin of Volcanology

, Volume 56, Issue 1, pp 62–74 | Cite as

Petrology of gabbroic xenoliths in 1960 Kilauea basalt: crystalline remnants of prior (1955) magmatism

  • R. V. Fodor
  • R. B. Moore
Article

Abstract

The 1960 Kapoho lavas of Kilauea's east rift zone contain 1–10 cm xenoliths of olivine gabbro, olivine gabbro-norite, and gabbro norite. Textures are poikilitic (ol+sp+cpx in pl) and intergranular (cpx+pl±ol±opx). Poikilitic xenoliths, which we interpret as cumulates, have the most primitive mineral compositions, Fo82.5, cpx Mg# 86.5, and An80.5. Many granular xenoliths (ol and noritic gabbro) contain abundant vesicular glass that gives them intersertal, hyaloophitic, and overall ‘open’ textures to suggest that they represent ‘mush’ and ‘crust’ of a magma crystallization environment. Their phase compositions are more evolved (Fo80-70, cpx Mg# 82-75, and An73-63) than those of the poikilitic xenoliths. Associated glass is basaltic, but evolved (MgO 5 wt%; TiO2 3.7–5.8 wt%). The gabbroic xenolith mineral compositions fit existing fractional crystallization models that relate the origins of various Kilauea lavas to one another. FeO/MgO crystal-liquid partitioning is consistent with the poikilitic ol-gabbro assemblage forming as a crystallization product from Kilauea summit magma with ∼8 wt% MgO that was parental to evolved lavas on the east rift zone. For example, least squares calculations link summit magmas to early 1955 rift-zone lavas (∼5 wt% MgO) through ∼28–34% crystallization of the ol+sp+cpx+pl that comprise the poikilitic ol-gabbros. The other ol-gabbro assemblages and the olivine gabbro-norite assemblages crystallized from evolved liquids, such as represented by the early 1955 and late 1955 lavas (∼6.5 wt% MgO) of the east rift zone. The eruption of 1960 Kapoho magmas, then, scoured the rift-zone reservoir system to entrain portions of cumulate and solidification zones that had coated reservoir margins during crystallization of prior east rift-zone magmas.

Key words

basalt gabbro xenolith Kilauea basalt crystallization basalt phases cumulate 

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References

  1. Beeson MH (1976) Petrology, mineralogy, and geochemistry of the East Molokai volcanic series, Hawaii. US Geol Surv Prof Pap 961:53ppGoogle Scholar
  2. Bence AE, Albee AL (1968) Empirical correction factors for the electron microanalysis of silicates and oxides. J Geol 76:382–403Google Scholar
  3. Bohrson WA, Clague DA (1988) Origin of ultramafic xenoliths containing exsolved pyroxenes from Hualalai volcano, Hawaii. Contrib Mineral Petrol 100:139–155CrossRefGoogle Scholar
  4. Buchanan DL (1979) A combined transmission electron microscope and electron microprobe study of Bushveld pyroxenes from the Bethal area. J Petrol 20:327–354Google Scholar
  5. Budahn JR, Schmitt RA (1985) Petrogenetic modeling of Hawaiian tholeiitic basalts: a geochemical approach. Geochim Cosmochim Acta 49:67–87CrossRefGoogle Scholar
  6. Davis AS, Clague DA (1990) Gabbroic xenoliths from the northern Gorda ridge: implications for magma chamber processes under slow spreading centers. J Geophys Res 95:10885–10905Google Scholar
  7. Dixon JE, Clague DA, Eissen JP (1986) Gabbroic xenoliths and host ferrobasalt from the southern Juan de Fuca ridge. J Geophys Res 91:3795–3820Google Scholar
  8. Fodor RV, Keil K, Bunch TE (1975) Contributions to the mineral chemistry of Hawaiian rocks IV. Pyroxenes in rocks from Haleakala and West Maui volcanoes, Maui, Hawaii. Contrib Mineral Petrol 50:173–195CrossRefGoogle Scholar
  9. Fodor RV, Keil K, Bunch TE (1977) Contributions to the mineral chemistry of hawaiian rocks IV. Olivine in rocks from Haleakala and West Maui volcanoes, Maui, Hawaii. Pacific Sci 31:299–308Google Scholar
  10. Fodor RV, Rudek EA, Bauer GR (1993) Hawaiian magma-reservoir processes as inferred from the petrology of gabbro xenoliths in basalt, Kahoolawe Island. Bull Volcanol 55:204–218CrossRefGoogle Scholar
  11. Galar P, Fodor RV (1992) Petrography and petrology of ultramafic and gabbroic xenoliths from Mauna Kea volcano, Hawaii. Geol Soc Am Abs 24 (#2):15Google Scholar
  12. Garcia MO, Ho RA, Rhodes JM, Wolfe EW (1989) Petrologic constraints on rift-zone processes. Bull Volcanol 52:81–96CrossRefGoogle Scholar
  13. Grove TL, Bryan WB (1983) Fractionation of pyroxene-phyric MORB at low pressure: an experimental study. Contrib Mineral Petrol 84:293–309CrossRefGoogle Scholar
  14. Helz RT (1987) Differentiation behavior of Kilauea Iki lava lake, Kilauea volcano, Hawaii: an overview of past and current work. In: Mysen BO (ed) Magmatic processes: physiciochemical principles. Geochem Soc Sp Pub 1:241–258Google Scholar
  15. Helz RT, Thornber CR (1987) Geothermometry of Kilauea Iki lava lake. Bull Volcanol 49:651–668CrossRefGoogle Scholar
  16. Helz RT, Wright TL (1992) Differentiation and magma mixing on Kilauea's east rift zone: a further look at the eruptions of 1955 and 1960. Part I. The late 1955 lavas. Bull Volcanol 54:361–384CrossRefGoogle Scholar
  17. Ho RA, Garcia MO (1988) Origin of differentiated lavas at Kilauea volcano, Hawaii: implications from the 1955 eruption. Bull Volcanol 50:35–46CrossRefGoogle Scholar
  18. Keil K, Fodor RV, Bunch TE (1972) Contributions to the mineral chemistry of Hawaiian rocks II. Feldspars and interstitial material in rocks from Haleakala and West Maui volcanoes, Maui, Hawaii. Contrib Mineral Petrol 37:237–276CrossRefGoogle Scholar
  19. Langmuir CH (1989) Geochemical consequences of in situ crystallization. Nature 340:199–205CrossRefGoogle Scholar
  20. Mangan MT, Marsh BD (1992) Solidification front fractionation in phenocryst-free sheet-like magma bodies. J Geology 100:605–620Google Scholar
  21. Marsh BD (1988) Crystal capture, sorting, and retention in convecting magma. Geol Soc Am Bull 100:1720–1737CrossRefGoogle Scholar
  22. Moore RB, Trusdell FA (1991) Geologic map of the lower east rift zone of Kilauea volcano, Hawaii. US Geol Surv Map I-2225 (1:24000)Google Scholar
  23. Moore RB, Helz RT, Dzurisin D, Eaton GP, Koyanagi RY, Lipman PW, Lockwood JP, Puniwai GS (1980) The 1977 eruption of Kilauea volcano, Hawaii. J Volcanol Geotherm Res 7:189–210CrossRefGoogle Scholar
  24. Murata KJ, Richter DH (1966) Chemistry of the lavas of the 1969–60 eruption of Kilauea volcano, Hawaii. US Geol Surv Prof Pap 537A:26ppGoogle Scholar
  25. Richter DH, Eaton JP, Murata KJ, Ault WU, Kirvoy HL (1970) Chronological narrative of the 1959–60 eruption of Kilauea volcano, Hawaii. US Geol Surv Prof Pap 537E:73ppGoogle Scholar
  26. Roeder PL, Emslie RF (1970) Olivine-liquid equilibrium. Contrib Mineral Petrol 29:275–289CrossRefGoogle Scholar
  27. Rowland SK, Walker GPL (1988) Mafic-crystal distribution, viscosities, and lava structures of some Hawaiian lava flows. J Volcanol Geotherm Res 35:55–66CrossRefGoogle Scholar
  28. Rudek EA, Fodor RV, Bauer GR (1992) Petrology of ultramafic and mafic xenoliths in picrite of Kahoolawe Island, Hawaii. Bull Volcanol 55:74–84CrossRefGoogle Scholar
  29. Smith D, Lindsley DH (1971) Stable and metastable augite crystallization trends in a single basalt flow. Am Mineral 56:225–233Google Scholar
  30. Wells PR (1977) Pyroxene thermometry in simple and complex systems. Contrib Mineral Petrol 62:129–139CrossRefGoogle Scholar
  31. Wilkinson JFG, Hensel HD (1988) The petrology of some picrites from Mauna Loa and Kilauea volcanoes, Hawaii. Contrib Mineral Petrol 98:326–345CrossRefGoogle Scholar
  32. Wright TL, Fiske RS (1971) Origin of the differentiated and hybrid lavas of Kilauea volcano, Hawaii. J Petrol 12:1–65Google Scholar
  33. Wright TL, Okamura RT (1977) Cooling and crystallization of tholeiitic basalt, 1965 Makaopuhi lava lake, Hawaii. US Geol Surv Prof Pap 1004:78ppGoogle Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • R. V. Fodor
    • 1
    • 2
  • R. B. Moore
    • 2
  1. 1.Department of Marine, Earth, and Atmospheric SciencesNorth Carolina State UniversityRaleighUSA
  2. 2.U.S. Geological SurveyDenverUSA

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