Please use this identifier to cite or link to this item: http://hdl.handle.net/10125/1670

Rock Varnish on Hualalai and Mauna Kea Volcanoes, Hawai'i

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dc.contributor.author Dorn, R.I.
dc.contributor.author Jull, AJT
dc.contributor.author Donahue, D.J.
dc.contributor.author Linick, T.W.
dc.contributor.author Toolin, L.J.
dc.contributor.author Moore, R.B.
dc.contributor.author Rubin, M.
dc.contributor.author Gill, T.E.
dc.contributor.author Cahill, T.A.
dc.date.accessioned 2008-06-06T08:13:50Z
dc.date.available 2008-06-06T08:13:50Z
dc.date.issued 1992-01
dc.identifier.citation Dorn RI, Jull AJT, Donahue DJ, Linick TW, Toolin LJ, Moore RB, Rubin M, Gill TE, Cahill TA. 1992. Rock varnish on Hualalai and Mauna Kea Volcanoes, Hawai'i. Pac Sci 46(1): 11-34.
dc.identifier.issn 0030-8870
dc.identifier.uri http://hdl.handle.net/10125/1670
dc.description.abstract Tropical rock varnishes found on Hualalai and Mauna Kea Volcanoes, Hawai'i, vary systematically with time and environment. Radiocarbon dating of encapsulated organic matter, (K+ + Ca2+)/Ti4+ ratios, and Zn, Cu, and Ni trace element concentrations in rock varnish are consistent with lava flowages established by K-Ar and 14C dating, where samples are collected from arid microsites well away from the soil surface. However, inaccurate ages are obtained from rock varnish in subsurface locations and from sites with abundant lichens, cyanobacteria, and fungi that chemically erode varnish. In contrast with continental deserts, Hawaiian varnishes commonly interfinger with and are less common than rock coatings of amorphous silica. Laboratory experiments on Hawaiian rock varnishes indicate that K and Ca are preferentially leached relative to Ti over time and at higher temperatures. The location of in situ leaching has been identified in Hawaiian varnishes as porous textures without abundant detrital grains.
dc.language.iso en-US
dc.publisher University of Hawai'i Press
dc.title Rock Varnish on Hualalai and Mauna Kea Volcanoes, Hawai'i
dc.type Article
dc.type.dcmi Text
Appears in Collections: Pacific Science Volume 46, Number 1, 1992


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