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Analysis of core saw cuttings1

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


During Integrated Ocean Drilling Program (IODP) Expedition 345, a new strategy for collecting, processing, and analyzing core saw cuttings was employed to obtain a representative sample of coarse-grained plutonic rock encountered at Hess Deep (see “Collection of core saw cuttings” in the “Methods” chapter [Gillis et al., 2014]). In the core recovered during Expedition 345, gabbroic rock with grain sizes >0.5 cm is common, with oikocrysts as large as 5 cm, and only very large samples can produce an average composition. In cases where drill cores are involved, this grain size requires an exceptionally long sample that would otherwise destroy much of the core. Point samples are few in number, preferentially taken on fine-grained homogeneous and plentiful lithologies in the core and generally avoiding altered, delicate, and “interesting” intervals with minerals, textures, and structures of interest for microscopic study, introducing a variety of sampling biases. To avoid this problem, we collected core cuttings from the rock saw.

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. Analysis of core saw cuttings. 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.345.115.2014

2Expedition 345 Scientists’ addresses.

Publication: 12 February 2014
MS 345-115