IODP Expedition 336; initiation of long-term coupled microbiological, geochemical, and hydrological experimentation within the seafloor at North Pond, western flank of the Mid-Atlantic Ridge

Online Access: Get full text
doi: 10.5194/sd-16-57-2015
Author(s): Edwards, K.; Bach, W.; Klaus, A.
Integrated Ocean Drilling Program, Expedition 336 Scientific Party
Author Affiliation(s): Primary:
University of Southern California, Los Angeles, CA, United States
Other:
University of Bremen, Germany
Texas A&M University, United States
Volume Title: Scientific Drilling
Source: Scientific Drilling, Vol.17, p.13-18. Publisher: Copernicus GmbH on behalf of the German Research Centre for Geosciences (GFZ), Gottingen, International. ISSN: 1816-8957
Note: In English. 21 refs.; illus., incl. 1 table, sketch map
Summary: Integrated Ocean Drilling Program (IODP) Expedition 336 addressed questions concerning subseafloor microbial life and its relation to seawater circulation and basalt-seawater reactions in the basaltic ocean crust. Sediment and basement samples were recovered at three drill sites located in the North Pond area, an 8 × 15 km large sediment pond on the 8 Ma western flank of the Mid-Atlantic Ridge around 22°45' N and 46°05' W in roughly 4450 m water depth. The average core recovery rate in basement was approx. 31%. The subseafloor depth of the basement holes ranges from 90 to 332 m; sediment thickness is between 36 and 90 m. Two of the holes (U1382A, and U1383C) were equipped with advanced Circulation Obviation Retrofit Kit (CORK) observatories, employing - for the first time - fiberglass casing. Another CORK string was deployed in Deep Sea Drilling Project (DSDP) Hole 395A, but the wellhead broke off upon final installment. Nonetheless, the North Pond observatory is fully operational and post-cruise observatory research is already underway. Combined geochemical and microbiological studies of the drill core samples and experimental CORK materials will help understand (1) the extent and activity of microbial life in basalt and its relation to basalt alteration by circulating seawater, and (2) the mechanism of microbial inoculation of an isolated sediment pond.
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Alteration; Atlantic Ocean; Basalts; Basement; Biogenic processes; Boreholes; Cores; Crust; DSDP Site 395; Drilling; Ecology; Expedition 336; Geomicrobiology; IODP Site U1382; IODP Site U1383; IODP Site U1384; Igneous rocks; Integrated Ocean Drilling Program; Marine drilling; Marine environment; Marine sediments; Microorganisms; Mid-Atlantic Ridge; North Atlantic; Ocean Drilling Program; Ocean floors; Oceanic crust; Sediments; Volcanic rocks
Coordinates: N224500 N224900 W0460300 W0460500
Record ID: 2014093719
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany