A channel sampling strategy for measurement of mineral modal and chemical composition of drill cores: application to lower oceanic crustal rocks from IODP Expedition 345 to the Hess Deep rift
Robert P. Wintsch
CORRESPONDING AUTHOR
Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT 06459, USA
Connecticut Geological Survey, 79 Elm Street, Hartford, CT 06106-5127, USA
Romain Meyer
Geological Survey of Luxembourg, Ministry of Mobility and Public Works,
23, Rue du Chemin de Fer, 8057 Bertrange, Luxembourg
David L. Bish
Department of Chemistry, Indiana University, Bloomington, IN 47405, USA
Ryan T. Deasy
U.S. Geological Survey, Florence Bascom Geoscience Center, 12201 Sunrise Valley Dr., MS 926A, Reston, VA 20192, USA
Toshio Nozaka
Department of Earth Sciences, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
Carley Johnson
Marathon Oil Corporation, Room #3545, 5555 San Felipe St., Houston, TX 77056, USA
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Short summary
Short summary
A workflow for sampling hard rock cores for microbiological research was developed and optimized during International Ocean Discovery Program (IODP) Expedition 399. These procedures and protocols were adapted from previous expeditions and further optimized for handling large numbers of hard rock samples. The workflow is also intended to facilitate interdisciplinary collaborations so as to maximize the scientific value of each sample for the whole scientific team.
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Short summary
We report a new method of obtaining representative samples of drill core with an example from the lower oceanic crust in the Hess Deep rift. Sawing drill core in half produces 1.3 g of rock per centimeter of core cut – material usually discarded. We show that when collected and analyzed properly, these samples reveal both the chemical composition of lower oceanic crust and the reactions that change the mineralogical and chemical composition of that crust.
We report a new method of obtaining representative samples of drill core with an example from...

