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DOI	10.1016/j.palaeo.2020.109655
	Origin and water depth of a newly identified seep carbonate and paleoecology of Bathymodiolus in the Miocene Taishu Group; southwestern Japan
	Ninomiya T.; Shimoyama S.; Miyata Y.; Yamanaka T.; Shimazu T.; Taniguchi S.; Aoki T.; Nishida T.; Takahashi T.
发表日期	2020
ISSN	0031-0182
卷号	546
英文摘要	The Fukuzaki Limestone is a small limestone lens embedded in siliciclastic Taishu Group rocks on Tsushima Island in the southwestern Japan Sea. A fossil assemblage in this limestone consisting of the bivalve mollusc Bathymodiolus sp. (Bathymodiolinae) was previously inferred, on the basis of the limestone's isolated lenticular occurrence and the chemosynthetic nature of modern Bathymodiolinae, to rely on chemosynthetic production, but conclusive evidence was not provided. Carbon, nitrogen, oxygen, and sulfur isotope ratios in the limestone and its host rock mudstone were measured to clarify the paleoecology of the fossil assemblage and the formation environment of the limestone. The low δ13C (−39.8‰ to −31.7‰) and δ18O (−13.8‰ to −11.9‰) values of carbonate of the limestone lens strongly suggest that the limestone is composed of authigenic carbonate rock precipitated from bicarbonate derived from anaerobic oxidation of biogenic or thermogenic methane. The fossil assemblage in the limestone lens is consistent with a chemosynthesis-based animal assemblage harboring thioautotrophic (sulfur-oxidizing) symbionts, and the low δ13C and δ34S values of total organic carbon and sulfide sulfur, respectively, in the limestone lens and mud layers suggest that they reflect chemosynthetic production using hydrogen sulfide derived from anaerobic methane oxidation by microbes. Furthermore, the stratigraphic position of the lens in the upper part of the Lower Unit of the Taishu Group indicates that it was precipitated at a water depth >800 m (deeper than the lower middle bathyal zone). These findings indicate that a deep-sea basin locally supplied with methane had already formed in the southwestern Japan Sea by rapid subsidence during the opening stage of the Japan Sea (16–17 Ma). © 2020 Elsevier B.V.
英文关键词	Anaerobic methane oxidation; Chemosynthetic production; Deep-sea basin; Japan Sea
语种	英语
scopus关键词	bicarbonate; bivalve; carbonate rock; deep sea; fossil assemblage; host rock; limestone; Miocene; oxidation; paleoecology; total organic carbon; Japan; Kyushu; Nagasaki [Kyushu]; Sea of Japan; Tsushima; Animalia; Bathymodiolinae; Bathymodiolus; Bathymodiolus sp.; Bivalvia; Mollusca
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150552
作者单位	Office for Graduate School of Education, Graduate School of Science, Kyushu University, 744 Motooka, Fukuoka, 819-0395, Japan; Saga University, 1 Honjo-machi, Saga, 840-8502, Japan; Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677 Yoshida, Yamaguchi, 753-8512, Japan; Department of Ocean and Environmental Sciences, Tokyo University of Marine Science and Technology, 4-5-7 Kounan, Minato-ku, Tokyo, 108-8477, Japan; Japan Petroleum Exploration Co., Ltd. (JAPEX), 1-7-12 Marunouchi, Chiyoda-ku, Tokyo, 100-0005, Japan; Hazama Ando Corporation, 6-1-20 Akasaka, Minato-ku, Tokyo, 107-8658, Japan; Shinwa Techno, Co., Ltd., 339-77 Kuroishi, Sasebo, 857-0401, Japan; Faculty of Education, Saga University, 1 Honjo-machi, Saga, 840-8502, Japan
推荐引用方式 GB/T 7714	Ninomiya T.,Shimoyama S.,Miyata Y.,et al. Origin and water depth of a newly identified seep carbonate and paleoecology of Bathymodiolus in the Miocene Taishu Group; southwestern Japan[J],2020,546.
APA	Ninomiya T..,Shimoyama S..,Miyata Y..,Yamanaka T..,Shimazu T..,...&Takahashi T..(2020).Origin and water depth of a newly identified seep carbonate and paleoecology of Bathymodiolus in the Miocene Taishu Group; southwestern Japan.Palaeogeography, Palaeoclimatology, Palaeoecology,546.
MLA	Ninomiya T.,et al."Origin and water depth of a newly identified seep carbonate and paleoecology of Bathymodiolus in the Miocene Taishu Group; southwestern Japan".Palaeogeography, Palaeoclimatology, Palaeoecology 546(2020).