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doi:10.2204/iodp.proc.345.114.2014

Geochemistry summary¹

K.M. Gillis, J.E. Snow, A. Klaus, G. Guerin, N. Abe, N. Akizawa, G. Ceuleneer, M.J. Cheadle, Á. Adrião, K. Faak, T.J. Falloon, S.A. Friedman, M.M. Godard, Y. Harigane, A.J. Horst, T. Hoshide, B. Ildefonse, M.M. Jean, B.E. John, J.H. Koepke, S. Machi, J. Maeda, N.E. Marks, A.M. McCaig, R. Meyer, A. Morris, T. Nozaka, M. Python, A. Saha, and R.P. Wintsch²

Introduction

A representative suite of the lithologies recovered at Site U1415 were analyzed during Integrated Ocean Drilling Program (IODP) Expedition 345 (see “Igneous petrology” and “Metamorphic petrology” in each hole chapter for characterization of the lithologic units). Chemical analyses were performed on 3 basaltic samples from Holes U1415J and U1415N; 45 gabbroic samples from Holes U1415E, U1415H–U1415J, and U1415P; and 5 samples of drilling-induced disaggregated gabbro from Holes U1415I and U1415J. Sample selection was based on discussion among representatives from all expertise groups within the shipboard scientific party. Inductively coupled plasma–atomic emission spectroscopy was used to determine major and trace element concentrations, and gas chromatography was used to measure H₂O, CO₂, and S concentrations. Geochemical data are reported in Table T1. These concentrations are reported on a volatile-free basis for major and trace elements.

The results of the chemical study are described in detail in “Inorganic geochemistry” in each hole chapter; the main results and petrogenetic outcomes are summarized below. Drilling-induced disaggregated gabbro samples were not included in this summary because they showed evidence of contamination by drilling materials (e.g., antirust coatings and components of the drill bit in Hole U1415I and drilling mud in Hole U1415J).

¹ Gillis, K.M., Snow, J.E., Klaus, A., Guerin, G., Abe, N., Akizawa, N., Ceuleneer, G., Cheadle, M.J., Adrião, Á., Faak, K., Falloon, T.J., Friedman, S.A., Godard, M.M., Harigane, Y., Horst, A.J., Hoshide, T., Ildefonse, B., Jean, M.M., John, B.E., Koepke, J.H., Machi, S., Maeda, J., Marks, N.E., McCaig, A.M., Meyer, R., Morris, A., Nozaka, T., Python, M., Saha, A., and Wintsch, R.P., 2014. Geochemistry summary. In Gillis, K.M., Snow, J.E., Klaus, A., and the Expedition 345 Scientists, Proc. IODP, 345: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.345.114.2014

² Expedition 345 Scientists’ addresses.

Publication: 12 February 2014
MS 345-114

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