Roots of the Halema`uma`u Crater Acid Sulfate System on Kilauea Volcano
نویسنده
چکیده
Blocks of acid sulfate altered rock ejected from Halema`uma`u crater in the March 2008 eruption provide evidence of deeper processes that are driving the shallow hydrothermal alteration in this area. Previous work shows that the surficial alteration is dominated by remnant opal (SiO2) and anatase (TiO2), which are compositionally similar to materials found at Home Plate on Mars. The opal deposits are indicative of water-related alteration on Mars, but two different theories have been proposed for their origin. The initial theory suggested the Home Plate deposits are similar to the acid sulfate leaching deposits at Halema`uma`u (Squyres et al., 2008), however Ruff et al. (2011) suggested that the Home Plate deposits represent hot spring sinter deposits similar to those at Yellowstone. Analysis of the samples ejected in the 2008 Halema`uma`u eruption demonstrate that materials leached from the surface are at least partially being redeposited at depth as anhydrite and natroalunite, which differ greatly from alteration related to hot springs sinter deposits.
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