Mineralogy at DSDP Site 82-558 and Hole 82-563

Downhole bulk-sample and clay-mineral analytical results for Sites 558 and 563 are presented in this chapter. These results show a Tertiary climatic and hydrologic evolution similar to that at other DSDP drill sites in the northeastern Atlantic Ocean (Sites 398, 403-406, 548-550, 552-555). The sediments recovered at both sites are primarily calcareous and chalky oozes characterized by >90% carbonate and minor quartz and plagioclase feldspar. Clay minerals smectite, kaolinite, illite, and chlorite are present throughout the cores; upsection, illite increases at the expense of smectite. The clay mineralogy suggests climatic cooling and increased ocean circulation during the Miocene. Intervals rich in very fine grained (<2 µm) quartz suggest times of increased eolian input. This could have resulted from development, during Oligocene and late Miocene time, of an arid, desertlike sediment provenance that lasted until the present day.

Adamnani Vita S. Columbae : prophecies, miracles and visions of St. Columba (Columcille) first abbot of Iona, A. D. 563-597 /

Mode of access: Internet.

(Table 1) Oxygen and carbon isotope ratios of benthic foraminifera of DSDP Holes 82-563

Previous studies of benthic foraminiferal isotopic composition have demonstrated that a latest Eocene-earliest Oligocene benthic foraminiferal d18O increase occurred in the Pacific, Southern and Atlantic Oceans (Douglas and Savin, 1973, doi:10.2973/dsdp.proc.17.120.1973; Savin et al., 1977, doi:10.1130/0016-7606(1975)86<1499:TMP>2.0.CO;2; Shackleton and Kennett, 1975, doi:10.2973/dsdp.proc.29.117.1975; Kennett and Shackleton, 1976, doi:10.1038/260513a0; Savin, 1977, doi:10.1146/annurev.ea.05.050177.001535; Keigwin, 1980, doi:10.1038/287722a0; Boersma and Shackleton, 1979, doi:10.2973/dsdp.proc.39.139.1977; Miller and Curry, 1982, doi:10.1038/296347a0; Miller et al., 1985, doi:10.2973/dsdp.proc.80.113.1985). A Middle Miocene d18O increase has been noted in the Pacific, Southern and South Atlantic Oceans (Douglas and Savin, 1973, doi:10.2973/dsdp.proc.17.120.1973; Savin et al., 1975, doi:10.1130/0016-7606(1975)86<1499:TMP>2.0.CO;2; Shackleton and Kennett, 1975, doi:10.2973/dsdp.proc.29.117.1975; Boersma and Shackleton, 1979, doi:10.2973/dsdp.proc.39.139.1977; Woodruff et al., 1981, doi:10.1126/science.212.4495.665; Savin et al., 1981, doi:10.1016/0377-8398(81)90031-1; and tentatively identified in the North Atlantic (Blanc et al., 1980, doi:10.1038/283553a0; Blanc and Duplessy, 1982, doi:10.1016/0198-0149(82)90033-4). Due to the incomplete nature of the North Atlantic stratigraphical record, however, the Oligocene to Middle Miocene isotopic record (Moore et al., 1978, Miller and Tucholke, 1983) of this ocean is poorly understood. In the modern ocean, the North Atlantic and its marginal seas has a critical role in abyssal circulation, influencing deep- and bottom-water hydrography as far away as the North Pacific (Reid and Lynn, 1971, doi:10.1016/0011-7471(71)90094-5; Worthington, 1976; Reid, 1971, doi:10.1016/0198-0149(79)90064-5). We now report oxygen isotope measurements on Oligocene to Middle Miocene (12-36 Myr BP) benthic foraminifera in the western North Atlantic which show two periods of enriched 18O values: early Oligocene and early Middle Miocene. These enriched intervals are interpreted as resulting, in part, from the build-up of continental ice sheets. The Oligocene to Middle Miocene d13C record shows three cycles of enrichment and depletion of large enough magnitude to be useful for time-Stratigraphical correlations. Within the biostratigraphical age resolution, d18O and d13C records correlate with records from other oceans, helping to establish a useful Tertiary isotopic stratigraphy. An Atlantic-Pacific d13C contrast of 0.3-0.9 per mil during the latest Oligocene to Middle Miocene (12-26 Myr BP) indicates North Atlantic deep and bottom-water production analogous to modern North Atlantic deep water (NADW).

The effect of social support derived from World of Warcraft on negative psychological symptoms

Previous research examining players of Massively-Multiplayer Online Games (MMOGs) suggests that players form meaningful relationships with each other. Other research indicates that people may derive social support from online sources and this social support has been associated with greater wellbeing. This study used an online survey of players (N = 206) of the MMOG “World of Warcraft” (WoW) to examine if social support can be derived from MMOGs, and to examine its relationship with negative psychological symptoms. Players of WoW were found to derive social support from playing and a positive relationship was found between game engagement and levels of in-game social support. Higher levels of in-game social support were associated with fewer negative psychological symptoms, although this effect was not maintained after accounting for social support derived from the offline sources. Additionally, a small subsample of players (N = 21) were identified that played for between 44 and 82 hours per week (M = 63.33). These players had significantly lower levels of offline social support and higher levels of negative symptoms compared to the rest of the sample. This study provides evidence that social support can be derived from MMOGs and the associated potential to promote well being, but also highlights the potential harm from spending excessive hours playing.