Importance of Orca Basin As A Study Site
The only recorded recovery of gas hydrates in the Gulf of Mexico from depths greater than 66 fbsf (20 mbsf) occurred at DSDP Site 618 in Orca basin. The recovery of biogenic methane hydrate from Orca basin is also significant due to the high salinity values, which at the sediment/water interface were nearly as high as those found in the Red Sea (where salinity values are 240-260 percent). The values decreased rapidly with depth to about 98 fbsf (30 mbsf) before becoming constant (48-56 percent). The hydrate recovered from both sites in Orca Basin were in the range of 85-121 fbsf (26-37 mbsf) and are physical evidence of the decreased salinity levels.
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