Geochemical Analysis as a Complementary Tool to Estimate the Uplift of Sediments Caused by Shallow Gas Hydrates in Mounds at the Seafloor of Joetsu Basin, Eastern Margin of the Japan Sea
Figure 9
Piston and push core correlations from background areas and mounds of both Umitaka Spur and Joetsu Knoll. The graphs show the geochemical parameters versus depth. Only the first 2.0 mbsf were plotted. Geochemical signatures of sediments placed over mounds, associated with gas hydrates, reflect a mixture of both Holocene and LGM signatures. Black circles indicate samples collected at Joetsu Knoll with no gas hydrates. Green squares represent samples collected at Umitaka Spur with no gas hydrates. Blue circles indicate gas hydrate-bearing sediments collected at mounds of Joetsu Knoll, while red squares represent gas hydrate-bearing sediments collected at mounds of Umitaka Spur. Shadow areas suggest geochemical trends of Unit 1 (Holocene).
