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doi:10.2204/iodp.proc.331.105.2011 BiostratigraphyPaleontological (PAL) samples from Site C0015 in sediments and core catcher material generally consist of pumice clasts and fragments (Table T3). Sediment samples from ~8.9 mbsf in Hole C0015C (0.1 g provided by the microbiology group), and from ~9.5 mbsf in the same core (the bottom of the core) also possess iron oxides (Fig. F5; cf. Fig. F6). The presence of iron oxides suggests an inflow of oxygenated seawater may have occurred in Hole C0015C. Foraminifers possessing degraded surfaces and secondary mineral coatings were observed in a sample from 3.01 mbsf in Hole C0015B (Table T4). The foraminiferal diversity of this sample was generally consistent with that found in the surface mud samples examined from Holes C0014A and C0014B. Coccolithophorids were not observed in core catcher samples at Site C0015 using light or electron microscopy, with the exception of a single weathered coccolithophore on an iron oxide grain from ~9.5 mbsf (Fig. F5B). Destruction of coccolithophorids is expected in iron-oxidizing environments because of acid generation associated with the hydrolysis of water. Examination of the iron oxide coating at high magnification revealed the presence of fibrous “oxides” possessing filaments that are consistent in size and shape with iron-oxidizing bacteria (Figs. F5B, F7). |
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