相模湾の"冷湧水"

概要

論文の詳細を見る
Pore water samples were collected with an in situ pore water squeezer for a submersible (ISPS-S) by the submersible Shinkai 2000 from a Calyptogena patch in the largest living Calyptogena community at the Hatsushima site (34°59.9'N, 139°13.6'E; 1146m deep) in western Sagami Bay, Japan. Sulfate decreased remarkably below 9cm depth and showed very low minimum values between ca. 20 and 40cm depth. Inversely, hydrogen sulfide increased significantly below 9cm depth and showed a very high maximum value of 13.8 mM at 36cm depth. DIC increased remarkably with hydrogen sulfide, and its δ^<13>C values decreased remarkably to less than -40‰. These indicate that microbial sulfate reduction using methane as the reductant proceeds actively at depths of ca. 20 to 40cm below the sediment water interface just beneath the living giant clams. Based on chemical and isotopic data of pore waters, geochemical situations of the Calyptogena communities at the Hatsushima site have been discussed.
日本古生物学会の論文
1996-06-30