A Paleogene deep-sea methane-seep community from Honshu, Japan
A Paleogene deep-sea methane-seep community from Honshu, Japan
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日本本州古近纪深海甲烷渗漏群落
DOI：
10.1016/j.palaeo.2013.07.015
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
Amano;K.;Jenkins;R. G.;Sako;Y.;Ohara;M. and Kiel;S.
孤立的石灰石存款发生在晚始新世至早渐新世的Tanamigawa组海底扇沉积在南部的日本本州串本镇郊区。岩相学、早期成岩胶结物的非常负的碳同位素特征以及化学共生双壳类（即thyasirids、vesicomyids和bathymodiolins）的丰度清楚地表明，该碳酸盐岩块是本州第一个古近纪甲烷渗漏存款。从地理学的角度来看，日本古近纪渗漏动物群的显著特征是明显的地方性囊泡虫Hubertschenckia ezoensis和透明双壳类的缺乏，而双壳类Conchocele bisecta和Bathymodiolusspp.，和腹足类Cryptonatica广泛分布于该时期的北太平洋渗漏群落中。虽然新生代渗漏社区一般由今天居住渗漏相同的家庭的成员，显着的差异，属级组成的主要化学共生的双壳类家庭，如Vesicomyidae和Lucinidae，和亚科Bathymodiolinae注意到，当日本的古近纪渗漏社区相比，那些早期的新近纪时代，一方面，和古近纪渗漏社区其他地方。
An isolated limestone deposit occurs within late Eocene to early Oligocene submarine fan deposits of the Tanamigawa Formation in the outskirts of Kushimoto Town in southern Honshu, Japan. The petrography, the very negative carbon isotope signature of early diagenetic cements, and the abundance of chemosymbiotic bivalves, namely thyasirids, vesicomyids and bathymodiolins, clearly identify this carbonate block as the first Paleogene methane seep deposit in Honshu. From a biogeographical point of view, distinctive features of Paleogene seep faunas in Japan are the apparently endemic vesicomyidHubertschenckia ezoensisand the scarcity of lucinid bivalves, whereas the bivalvesConchocele bisectaandBathymodiolusspp., and the gastropodCryptonaticawere widespread in North Pacific seep communities of this age. Although Cenozoic seep communities generally consists of members of the same families that inhabit seeps today, marked differences in the genus-level composition of the major chemosymbiotic bivalve families such as Vesicomyidae and Lucinidae, and the subfamily Bathymodiolinae are noted when Paleogene seep communities in Japan are compared to those of early Neogene age on the one hand, and to Paleogene seep communities elsewhere on the other.