Moorby, S A; Cronan, David S (1983): (Table 7) Fe**3+/Fe**2+ ratios in selected nontronite samples at DSDP Leg 70 Holes. PANGAEA, https://doi.org/10.1594/PANGAEA.815446, Supplement to: Moorby, SA; Cronan, DS (1983): Chemical composition of sediments from Sites 506, 507, 508, and 509, Leg 70, Deep Sea Drilling Project. In: Honnorez, J; Von Herzen, RP; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 70, 269-275, https://doi.org/10.2973/dsdp.proc.70.112.1983
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Since its discovery in 1974 (Klitgord and Mudie, 1974), the Galapagos mounds hydrothermal field has received much attention. Sediment samples were taken during Leg 54 of the Deep Sea Drilling Project (DSDP) and by other expeditions to the area (e.g., Corliss et al., 1978). While a hydrothermal origin for the mounds sediments has been generally accepted, several different theories of origin for the mounds themselves have been proposed (e.g., Corliss et al., 1978; Natland et al., 1979; Williams et al., 1979).
One of the aims of DSDP Leg 70 was to return to the mounds field and, using the new hydraulic piston cor er described elsewhere in this volume, to obtain more complete recovery of mounds sediments than had previously been possible. It was our hope that this would help in our understanding of the nature and origin of these deposits. In this chapter, we describe the results of chemical analysis of over 250 sediment samples taken during the course of Leg 70.
Median Latitude: 0.596000 * Median Longitude: -86.100920 * South-bound Latitude: 0.566700 * West-bound Longitude: -86.132200 * North-bound Latitude: 0.609800 * East-bound Longitude: -86.090000
Date/Time Start: 1979-11-15T00:00:00 * Date/Time End: 1979-11-27T00:00:00
Minimum Elevation: -2710.0 m * Maximum Elevation: -2687.0 m
70-506 * Latitude: 0.609800 * Longitude: -86.099800 * Date/Time: 1979-11-15T00:00:00 * Elevation: -2710.0 m * Penetration: 36.7 m * Recovery: 22.7 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 27.9 m cored; 8.8 m drilled; 81.5 % recovery
70-506C * Latitude: 0.607700 * Longitude: -86.091300 * Date/Time: 1979-11-15T00:00:00 * Elevation: -2710.0 m * Penetration: 31.3 m * Recovery: 29.7 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 31.3 m cored; 0 m drilled; 95 % recovery
70-506D * Latitude: 0.607000 * Longitude: -86.091300 * Date/Time: 1979-11-15T00:00:00 * Elevation: -2707.0 m * Penetration: 31.9 m * Recovery: 29.2 m * Location: North Pacific/MOUND * Campaign: Leg70 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 31.9 m cored; 0 m drilled; 91.6 % recovery
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|2||Sample code/label||Sample label||Moorby, S A||ODP sample designation|
|3||Iron||Fe||%||Moorby, S A||Coupled plasma emission spectrophotometry||Total|
|4||Iron 2+||Fe2+||%||Moorby, S A||Coupled plasma emission spectrophotometry|
|5||Ratio||Ratio||Moorby, S A||Coupled plasma emission spectrophotometry||Fe3+/Fe2+ ratio|
|6||Iron 2+||Fe2+||%||Moorby, S A||Coupled plasma emission spectrophotometry||From Fe-total|
70 data points