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

Date
1992-01
Authors
Dorn, R.I.
Jull, AJT
Donahue, D.J.
Linick, T.W.
Toolin, L.J.
Moore, R.B.
Rubin, M.
Gill, T.E.
Cahill, T.A.
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
University of Hawai'i Press
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
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.
Description
Keywords
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.
Extent
Format
Geographic Location
Time Period
Related To
Table of Contents
Rights
Rights Holder
Local Contexts
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.