© ICDP, the International Continental Scientific Drilling Program, 1996-2021

www.icdp-online.org

Hawai'i Scientific Drilling Project

Pacific, U.S.A., Hawai'i, Big Island, Hilo

new preliminary-proposal: ICDP-1996/18
for the funding-period starting 1996-01-15
by Donald J. DePaolo, Edward M. Stolper, Donald M. Thomas
Abstract
This proposal covers a 5 year period to (1) core drill continuously ~4.5 km into the flank of the Mauna Kea volcano in the vicinity of Hilo, Hawaii; (2) perform a suite of downhole logs and experiments to characterize the hole, and (3) describe and analyze the recovered samples with a wide array of techniques. The major focus of the proposed project is the recovery and characterization of a continuous set of samples. These samples will provide a unique opportunity to study the long-term evolution of a major, oceanic volcano and to test aspects of the mantle plume hypothesis. When properly logged and curated, the recovered suite of rocks can serve as a valuable resource for future generations. The proposed drilling plan consits of three phases with target depths of ~1700, 3400, and ~4500m. Each phase is expectes to span a period of two years during which about 6 months will be devoted to drilling and coring; the balance of the time will be spent conducting downhole research and analyses of the recovered core samples. The downhole logging program will be conducted at intervals through each phase of the drilling program. This will be followed by perforation of the casing at formations of interest (as identified in the geophysical logging program) and sampling and analysis of fluids, as well as hydrologic analyses of the formation. The syn- and post-drilling analytical program for each stage will be modeled after the program used in the pilot project. The core will be characterized and logged on-site so that sampling can be done during and immediately after drilling. A subset of identified flows will be described petrographically; analyzed for major, minor, and trace element composition; analyzed for radiogenic and stable isotopic ratios; dated radiometrically; and characterized for paleomagnetic properties (inclination and field intensity). Water samples collected downhole will be similarly analyzed and dated. Cores will be shipped to the mainland for curation over the lifetime of the project to make the cores more accessible to interested coinvestigators and other scientists.
Scientific Objectives
Keywords
Alteration, Ar, Basalts, Calcium, Clay minerals, Cooling history, Deep biosphere, DOSECC, Drilling, Geochemistry, Geophysics, Glass, Hawaii, Hf isotopes, High resolution, HSDP, ICDP-1996/18, Isotopes, Major elements, Mantle plume, Mauna kea, Metamorphism, Microorganism, Microprobe, Ne, Neodymium, Noble gases, Oxygen isotope analyses, Palagonites, Palagonitization, Paleointensity, Pb-isotopes, Periodicity, Petrology, Plate tectonics, Recycling, Smectite, Strontium, Submarine basaltic glass, Sulphur, Thermal regimes, U.S.A., Vitrophyres, Volcanic systems, Volcanics, Volcano, Volcanology, Zeolites
Location
Pacific, U.S.A., Hawai'i, Big Island, Hilo: 19.74, -155.05

© ICDP, the International Continental Scientific Drilling Program, 1996-2021

www.icdp-online.org