Geochemistry summary

Hole U1415I

“…Major and trace elements were determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and gas chromatography was used for S, H 2 O, and CO 2 quantifications. Results are reported in Table T1 in the "Geochemistry summary" chapter (Gillis et al, 2014c), and selected data are shown in Figures F29 and F30. Major and trace elements are reported on a volatile-free basis.…”

Methods

“…A thin section was located next to each of the geochemistry samples to precisely determine their modal composition and degree of alteration because of the highly heterogeneous lithologies sampled at Site U1415 (see "Igneous petrology" and "Metamorphic petrology" in each hole chapter for the characterization of the lithologic units). The rock names in the resulting table (see Table T1 in the "Geochemistry summary" chapter [Gillis et al, 2014a]) were determined on the basis of the thin section descriptions (see "Igneous petrology"). A characteristic of Site U1415 gabbroic rock is the abundance of trace orthopyroxene observed in some holes.…”

Hole U1415AJ

“…While waiting for this to happen, we conducted a near-bottom camera and 3.5 kHz pinger survey of two other potential drill sites (see the "Bench site survey" chapter [Gillis et al, 2014a]). At the completion of the survey, we reentered Hole U1415J at 2215 h on 9 January.…”