D'Hondt, Steven; Inagaki, Fumio; Alvarez Zarikian, Carlos; Dubois, Nathalie; Engelhardt, Tim; Evans, Helen; Ferdelman, Timothy; Gribsholt, Britta; Harris, Robert N.; Hoppie, Bryce W.; Hyun, Jung-Ho; Kallmeyer, Jens; Kim, Jinwook; Lynch, Jill E.; Mitsunobu, Satoshi; Morono, Yuki; Murray, Richard W.; Shimono, Takaya; Shiraishi, Fumito; Smith, Davic C.; Smith-Duque, Christopher E.; Spivack, Arthur J.; Steinsbu, Bjorn Olav; Suzuki, Yohei; Szpak, Michal; Toffin, Laurent; Uramoto, Goichiro; Yamaguchi, Yasuhiko T.; Zhang, Guo-Liang; Zhang, Xiao-Hua; Ziebis, Wiebke (2013): IODP Expedition 329; Life and habitability beneath the seafloor of the South Pacific Gyre. Integrated Ocean Drilling Program Management International, Sapporo; Washington, DC, International, Scientific Drilling, 15, 4-10, georefid:2013-047784

Integrated Ocean Drilling Program (IODP) Expedition 329 made major strides toward fulfilling its objectives. Shipboard studies documented (1) fundamental aspects of habitability and life in this very low activity subseafloor sedimentary ecosystem and (2) first-order patterns of habitability within the igneous basement. A broad range of postexpedition studies will complete the expedition objectives. Throughout the South Pacific Gyre (SPG; Sites U1365-U1370), dissolved oxygen and nitrate are present throughout the entire sediment sequence, and sedimentary microbial cell counts are lower than at all previously drilled IODP/Ocean Drilling Program (ODP)/Deep Sea Drilling Program (DSDP) sites. In contrast, at Site U1371 in the upwelling zone just south of the gyre, detectable oxygen and nitrate are limited to the top and bottom of the sediment column, manganese reduction is a prominent electron-accepting process, and cell concentrations are higher than at the same depths in the SPG sites throughout the sediment column. Geographic variation in subseafloor profiles of dissolved and solid-phase chemicals are consistent with the magnitude of organic-fueled subseafloor respiration declining from outside the gyre to the gyre center. Chemical profiles in the sedimentary pore water and secondary mineral distributions in the basaltic basement indicate that basement alteration continues on the timescale of formation fluid replacement, even at the sites with the oldest basement (84-120 Ma at Sites U1365 and U1366).
West: -165.3839 East: -123.0939 North: -23.5103 South: -45.5751
Expedition: 329
Site: 329-U1365
Site: 329-U1366
Site: 329-U1367
Site: 329-U1368
Site: 329-U1369
Site: 329-U1370
Site: 329-U1371
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2204/iodp.sd.15.01.2013 (c.f. for more detailed metadata)
Data download: application/x-unknown-media-type
This metadata in ISO19139 XML format