Origin and water depth of a newly identified seep carbonate and paleoecology of Bathymodiolus in the Miocene Taishu Group, southwestern Japan

Ninomiya, Takashi; Shimoyama, Shoichi; Miyata, Yasumitsu; Yamanaka, Toshiro; Shimazu, Takashi; Taniguchi, Sho; Aoki, Takeshi; Nishida, Tamio; Takahashi, Toshihiro

doi:10.1016/j.palaeo.2020.109655

Cited by 4 publications

(11 citation statements)

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“…The Tsushima islands are located between the Eurasian continent and Japanese Islands, and are therefore important in understanding the ancient seep systems during the opening of the Sea of Japan back-arc basin. The carbonate bodies and associated chemosynthesis-based faunas from the Taishu Group have been previously reported by Ninomiya (2011Ninomiya ( , 2012 and Ninomiya et al (2020) at four sites, along with the isotopic evidence for seeprelated identity of two of these deposits (Ninomiya, 2012;Ninomiya et al 2020). However, these tentative identifications of the chemosynthetic species are based on ill-preserved shells, which, in our opinion, allow for identification to the generic level only.…”

Section: Introductionsupporting

confidence: 53%

“…Formation, diagenesis and fauna of cold seep carbonates by submarine landslides came from surrounding shallow shelf areas and were transported to the base of the continental slope at a high sedimentation rate (Golozubov et al 2017). The palaeobathymetric estimates for at least the lower parts of the Taishu Group indicate water depths exceeding 800 m (Ninomiya et al 2020).…”

Section: Geological Settingmentioning

confidence: 94%

“…2), representing a succession of mudstones, sandstones and conglomerates deposited under marine and estuarine conditions influenced by northward-progradating river deltas (e.g. Nakajo, 1998;Nakajo & Maejima, 1998;Ninomiya et al 2014Ninomiya et al , 2020. The bulk of the Taishu Group represents marine sediments accumulated due to landslide activity in the palaeo-Tsushima Basin formed by pullapart tectonics in the SW Sea of Japan.…”

Section: Geological Settingmentioning

confidence: 99%

“…kimurai murayamai (Yokoyama) occurred in the lower part, and the deep-water faunas including protobranchs and mud pectens in the middle and upper parts of the Taishu Group. The chemosynthetic bivalves from the Fukuzaki (mistakenly referred to as Fukusaki), Tanohama and Kanoura Limestones have been described in ascending order by Ninomiya (2011Ninomiya ( , 2012 and Ninomiya et al (2020). The former two limestones occur in the uppermost part of the Lower Formation while the Kanoura Limestone has a position near the lowermost part of the Middle Formation (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…1). In 2016 the deposit included an in situ carbonate body c. 5.6 m long and c. 0.3 m thick found in the cliff (see also Ninomiya et al 2020) and numerous rounded boulders found on the beach (Fig. 3a).…”

Section: A1 Locality Descriptionmentioning

confidence: 99%

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Formation, diagenesis and fauna of cold seep carbonates from the Miocene Taishu Group of Tsushima (Japan)

et al. 2020

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The studied seep carbonates from Tsushima, Japan, are embedded within marine siliciclastics of the lower Miocene Taishu Group and represent the earliest evidence of hydrocarbon seepage in the Sea of Japan. In contrast to Miocene and Pliocene examples from Honshu, which are often found above anticlines, the seeps from Tsushima formed within a pull-apart basin before major anticlines had formed. The three carbonates from Fukuzaki, Kanoura and Tanohama are composed chiefly of calcite, with significant admixture of ankerite only at Kanoura. The stable carbon isotope composition of calcites (δ13C as low as −40.2 ‰ VPDB for Fukuzaki, −41.8 ‰ VPDB for Kanoura, and −52.8 ‰ VPDB for Tanohama) indicate methanogenic origin of the carbonates. Textures of these deposits, including radiaxial and yellow cements, are indicative of formation at a methane seep. The stable oxygen isotope composition of calcites (δ18O values as low as −14.4 ‰ VPDB for Fukuzaki, −14.5 ‰ VPDB for Kanoura and −13.9 ‰ VPDB for Tanohama) indicate that they were influenced by burial fluids. Burial diagenesis is also indicated by the stable isotopic compositions of ankerite (δ13C ranging from −19.1 ‰ to −7.1 ‰ VPDB, δ18O from −11.1 ‰ to −9.7 ‰ VPDB). Molecular fossils from Tanohama comprise n-alkanes with short-chain predominance, interpreted to have formed due to thermal cracking of organic matter. The carbonates yield a chemosynthesis-based community comprising vesicomyids Pleurophopsis chitanii, P. cf. hamuroi, the bathymodiolin ‘Bathymodiolus’ akanudaensis, the lucinid Lucinoma sp. and the provannid Provanna? sp., which have never been hitherto identified. ‘Bathymodiolus’ akanudaensis, Lucinoma sp. and Provanna? sp. are the oldest records of these taxa in the Sea of Japan.

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Section: Introductionsupporting

confidence: 53%

Section: Geological Settingmentioning

confidence: 94%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: A1 Locality Descriptionmentioning

confidence: 99%

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Formation, diagenesis and fauna of cold seep carbonates from the Miocene Taishu Group of Tsushima (Japan)

et al. 2020

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Ancient Hydrocarbon Seeps of the World

Hryniewicz

2022

Topics in Geobiology

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Styles of mesoscale brittle deformations associated with the Miocene folding of the Taishu Group, Tsushima, between the Japan Sea and East China Sea backarc basins

2021

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The Taishu Group is a folded, Eocene-Lower Miocene, thick sedimentary package exposed widely on Tsushima Island between the Japan Sea and East China Sea. This location makes the strata important to understand tectonics and paleo-environments in the Far East, but the timing of the folding is controversial. We studied the styles of brittle deformations of the strata. It was found that flextural-slip folds were dominant. Mesoscale faults were classified into two groups: NE-SW trending reverse faults and NW-SE trending strike-slip faults. Members of both the groups showed movements largely perpendicular to the fold axes. The latter group consisted of sinistral and dextral faults.Accordingly, we interpreted that they were transfer faults activated during the folding.Consequently, mesoscale faults and flexural-slip faults evidence the map-scale plane strain of the Taishu Group in the plane perpendicular to the NE-trending fold axes. There were few transpressional deformations in the group. This is inconsistent with the transpression hypothesis for explaining the simultaneous folding and Japan Sea opening. Another hypothesis in which the folds in Tsushima are regarded as an onshore part of the Taiwan-Shinji fold belt is inconsistent with the timing of folding suggested by mining geologists to be consistent with and contemporaneous with this deformation. On the other hand, we found that dolerite dikes and sills were involved in the folding. Therefore, we conclude that the folding began during the late Early Miocene time and climaxed during the ore mineralization at around 15 Ma. We suggest that the folding in Tsushima was the easternmost manifestation of the compressional regime around the Yellow Sea and East China Sea in the Early to early Middle Miocene, and that the compression was brought about by the arrival of the Philippine Sea plate to initiate buoyant subduction under Kyushu.

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Origin and water depth of a newly identified seep carbonate and paleoecology of Bathymodiolus in the Miocene Taishu Group, southwestern Japan

Cited by 4 publications

References 70 publications

Formation, diagenesis and fauna of cold seep carbonates from the Miocene Taishu Group of Tsushima (Japan)

Formation, diagenesis and fauna of cold seep carbonates from the Miocene Taishu Group of Tsushima (Japan)

Ancient Hydrocarbon Seeps of the World

Styles of mesoscale brittle deformations associated with the Miocene folding of the Taishu Group, Tsushima, between the Japan Sea and East China Sea backarc basins

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