The isotopic composition of postshield lavas from Mauna Kea volcano, Hawaii

A. K. Kennedy, Sung Tack Kwon, F. A. Frey, H. B. West

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The postshield eruptive stage of Mauna Kea volcano, Hawaii, can be divided into an early basaltic substage, the Hamakua Volcanics, containing picrites, ankaramites, alkalic and tholeiitic basalt, and a hawaiite substage, the Laupahoehoe Volcanics, containing only hawaiites and rare mugearites. Cumulate gabbroic xenoliths in Laupahoehoe Volcanics have isotopic ratios similar to the Hamakua Volcanics, and these gabbros provide constraints on the crustal evolution of Mauna Kea lavas. Because of the small variation in 87Sr 86Sr (0.70335-0.70362), 143Nd 144Nd (0.51297-0.51308) and 206Pb 204Pb (18.306-18.440), lavas from both substages must contain relatively fixed proportions of depleted, enriched and primitive mantle components. In addition, there is Sr, Nd and Pb isotopic overlap between tholeiitic and alkalic Hamakua basalts. However, the steep 207Pb 204Pb vs. 206Pb 204Pb arrays of postshield lavas from Mauna Kea, West Maui and Haleakala volcanoes and the existence of rare samples with high 207Pb 204Pb up to 15.548, requires an unusual component in some Hawaiian lavas. This component is unlikely to be derived from sediments or MORB lithosphere, and it may be a minor plume component. Lavas erupted during the postshield stage of Mauna Kea volcano do not define a systematic temporal trend of varying 87Sr 86Sr and 143Nd 144Nd. This result contrasts with the temporal trend defined by lavas from Haleakala Volcano and provides evidence for important differences between the origin and evolution of different Hawaiian volcanoes. However, the Laupahoehoe Volcanics trend to lower 206Pb 204Pb ratios than the Hamakua Volcanics. As inferred for other Hawaiian volcanoes, this trend reflects a larger proportion of a depleted component in the youngest lavas. Finally, postshield lavas from Mauna Kea have relatively high Ce Pb (40 ± 4 in 28 Mauna Kea lavas) when compared with most oceanic basalts, and this ratio may be more variable in oceanic island lavas than previously recognized.

Original languageEnglish
Pages (from-to)339-353
Number of pages15
JournalEarth and Planetary Science Letters
Volume103
Issue number1-4
DOIs
Publication statusPublished - 1991 Jan 1

Fingerprint

Volcanoes
volcanoes
volcanology
isotopic composition
volcano
Chemical analysis
basalt
trends
proportion
picrite
crustal evolution
tholeiitic basalt
cumulate
isotopic ratio
mid-ocean ridge basalt
lithosphere
plumes
Sediments
sediments
Earth mantle

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Kennedy, A. K. ; Kwon, Sung Tack ; Frey, F. A. ; West, H. B. / The isotopic composition of postshield lavas from Mauna Kea volcano, Hawaii. In: Earth and Planetary Science Letters. 1991 ; Vol. 103, No. 1-4. pp. 339-353.
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The isotopic composition of postshield lavas from Mauna Kea volcano, Hawaii. / Kennedy, A. K.; Kwon, Sung Tack; Frey, F. A.; West, H. B.

In: Earth and Planetary Science Letters, Vol. 103, No. 1-4, 01.01.1991, p. 339-353.

Research output: Contribution to journalArticle

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N2 - The postshield eruptive stage of Mauna Kea volcano, Hawaii, can be divided into an early basaltic substage, the Hamakua Volcanics, containing picrites, ankaramites, alkalic and tholeiitic basalt, and a hawaiite substage, the Laupahoehoe Volcanics, containing only hawaiites and rare mugearites. Cumulate gabbroic xenoliths in Laupahoehoe Volcanics have isotopic ratios similar to the Hamakua Volcanics, and these gabbros provide constraints on the crustal evolution of Mauna Kea lavas. Because of the small variation in 87Sr 86Sr (0.70335-0.70362), 143Nd 144Nd (0.51297-0.51308) and 206Pb 204Pb (18.306-18.440), lavas from both substages must contain relatively fixed proportions of depleted, enriched and primitive mantle components. In addition, there is Sr, Nd and Pb isotopic overlap between tholeiitic and alkalic Hamakua basalts. However, the steep 207Pb 204Pb vs. 206Pb 204Pb arrays of postshield lavas from Mauna Kea, West Maui and Haleakala volcanoes and the existence of rare samples with high 207Pb 204Pb up to 15.548, requires an unusual component in some Hawaiian lavas. This component is unlikely to be derived from sediments or MORB lithosphere, and it may be a minor plume component. Lavas erupted during the postshield stage of Mauna Kea volcano do not define a systematic temporal trend of varying 87Sr 86Sr and 143Nd 144Nd. This result contrasts with the temporal trend defined by lavas from Haleakala Volcano and provides evidence for important differences between the origin and evolution of different Hawaiian volcanoes. However, the Laupahoehoe Volcanics trend to lower 206Pb 204Pb ratios than the Hamakua Volcanics. As inferred for other Hawaiian volcanoes, this trend reflects a larger proportion of a depleted component in the youngest lavas. Finally, postshield lavas from Mauna Kea have relatively high Ce Pb (40 ± 4 in 28 Mauna Kea lavas) when compared with most oceanic basalts, and this ratio may be more variable in oceanic island lavas than previously recognized.

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