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Chemical composition of sediments from marine shallow-water hydrothermal mounds in Wakamiko submarine crater revealed by multiple prompt $$gamma$$-ray analysis

Shozugawa, Katsumi*; Matsuo, Motoyuki*; Sano, Yuji*; Toh, Yosuke ; Murakami, Yukihiro*; Furutaka, Kazuyoshi; Koizumi, Mitsuo; Kimura, Atsushi; Hara, Kaoru; Kin, Tadahiro; Oshima, Masumi; Nakamura, Shoji; Harada, Hideo 

Multiple prompt $$gamma$$-ray analysis (MPGA), a new quantification method with high energy resolution, was applied to sediments from a marine shallow-water hydrothermal mound. Surface sediments around mounds were collected from the Wakamiko submarine crater located in Kagoshima Bay, southwest Japan, where the hydrothermal system was different from those at other marine shallow-water hydrothermal mounds. All samples were desalted and MPGA measurements were performed for 4,500 s (real time). Event data were obtained using eight CLOVER Ge detectors. We could obtain concentrations of $$^{32}$$S, $$^{55}$$Mn, $$^{75}$$As, $$^{157}$$Gd, $$^{39}$$K, $$^{149}$$Sm, $$^{56}$$Fe, and $$^{85}$$Rb with high sensitivity by MPGA. Furthermore, $$^{32}$$S, $$^{85}$$Rb, and $$^{55}$$Mn have characteristic concentrations only at a mound, suggesting that sediments were sulfated by magmatic fluids at this mound.

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Category:Chemistry, Analytical

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