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doi:10.2204/iodp.proc.338.204.2016

Methods and materials

Core and cuttings sandy sediment samples (10 cm³) were collected through the basin and prism stratigraphy during Integrated Ocean Drilling Program (IODP) Expedition 338 (Strasser et al., 2014). Where possible, intervals with no sample coverage were completed with material recovered during IODP Expedition 315 (see the “Expedition 315 Site C0002” chapter [Expedition 315 Scientists, 2009]). Sampling distribution was ~1 sample per core/cuttings where available. A total of 99 Miocene–recent samples were obtained.

Semiconsolidated sediments of each sample were fully disaggregated with the help of a sonicator and were wet-sieved using 62 µm mesh to isolate the sand-size fraction. Dried sand was impregnated with blue-dyed epoxy and mounted into thin sections. Each sample was stained following the method outlined by Houghton (1980), in which Ca-plagioclase is stained pink, K-feldspar is stained yellow, glass may take one or both colors, and Na-plagioclase remains unstained.

Each sample was studied under a transmitted-light microscope (plane- and cross-polarized modes), and photomicrographs of representative lithic fragments were taken. Unless otherwise indicated, the grain of interest is at the center of the image.

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