Chemical aspects of a brine pool at the East Flower Garden bank, northwestern Gulf of Mexico

• Main Authors: Jumes M. Brooks, Thomasj Bright, Bernie B. Bernard, Claude R. Schwab
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1979
• Subjects: Orca
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.533.8384; http://www.aslo.org/lo/toc/vol_24/issue_4/0735.pdf

A small pool on the flank of the East Flower Garden bank at a depth of 72 m in the Gulf of Mexico contains anoxic, hypersaline (-200 g * kg-l) water. The flux of brine into and out of the pool contributes to erosional processes on the bank. The bulk ionic composition of the brine is similar to that of the Orca Basin brine, but differences between the two in gaseous hydrocarbon and carbon isotope content indicate different modes of origin. High levels of bacterial activity in the brine are indicated by ATP (X30 ngsliter-‘), hydrogen sulfide (>2,000 pmol.liter-l), isotopically light I;COz (6r3C =-23%0), and the apparent generation of ele-mental sulfur. In September 1976, a brine pool (Fig. 1) in a depression on the East Flower Garden (EFG) bank (27”53’N, 93’38’W) was discovered at a depth of 72 m (using the Texas A&M University research sub-mersible DRV Diuphus and research