OCS Study MMS 95 - Data Center

3 .16 East-west 3 .5 kHz echo sounder profile across the GC 184 mud mound . . . . . . 3-384 .1 Summary of seep site processes and indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-24 .2 Oil seepage adds 13C-depleted organic carbon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-44 .3 Oil seepage adds organic carbon at seep sites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-54 .4 Sources of carbonate at seeps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..4-64 .5 Evidence of microbial hydrocarbon oxidation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..4-74 .6 GC 184 (Dive 3269) methane concentrations (ppm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-94 .7 GC 234 (Dive 3265) methane concentrations (ppm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-104 .8 GC 272 (Dive 3280) methane concentrations (ppm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-114 .9 GC 272 (Dive 3279) methane concentrations (ppm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-124 .10 Detailed locations of core samples taken from a zoned orange and whiteBeggiatoa mat at the GC 2341ocality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-144 .11 Examples of C15+ chromatograms of hexane extracts from the GC 234,GC 185, GC 272, and GC 233 areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-194 .12 Histograms illustrating that the concentrations of UCM in core samplesof the GC 234 Beggiatoa mat are higher beneath the mat than in controlcores away from the mat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-224 .13 Histograms illustrating that the concentrations of total C1-C5hydrocarbons in core samples of the GC 234 Beggiatoa mat are higherbeneath the mat than in control cores away from the mat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-234.14 Comparison of C15+ chromatograms of a subsurface reservoir sample ofoil from Jolliet Field in GC 184 and a seep sample from GC 185 (BushHill) illustrates the effects of bacterial oxidation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-254.15 Histograms illustrating differences in UCM concentrations between thefour study areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-264.16 Histograms illustrating differences in total C1-C5 hydrocarbonconcentrations between the four study areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-284.17 A C15+ chromatogram of sediments from a mud volcano on GC 143 . . . . . . . . . . . . 4-315 .1 Relation between tube length and wet weight for hydrocarbon seepvestimentiferans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-115 .2 Size frequency distributions for SM la at three hydrocarbon seep sites . . . . . . . 5-27acvi