Review of fossil chemosynthetic assemblages in Japan

Majima, Ryuichi; Nobuhara, Takami; Kitazaki, Tomomi

doi:10.1016/j.palaeo.2005.04.028

Cited by 87 publications

(53 citation statements)

References 45 publications

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“…The diagnostic features of ancient seep carbonates commonly include low  13 C values of early diagenetic carbonate phases, special sedimentary fabrics such as clotted micrites, peloids and framboid pyrites, the occurrence of low diversity but high abundance faunal assemblage fossils and distinct 13 C-depleted biomarkers [10,13,14,[16][17][18][19][20][21]. Since the "seep-search strategy" was proposed by Campbell and Bottjer [22], more and more ancient seep deposits were discovered and studied.…”

Section: Hcomentioning

confidence: 99%

“…Since the "seep-search strategy" was proposed by Campbell and Bottjer [22], more and more ancient seep deposits were discovered and studied. Today, ancient hydrocarbon seeps have already been recognized from Devonian to Quaternary strata in almost all continents based on occurrences of seep carbonates and/or fossil chemosynthetic assemblages [10,13,14,[16][17][18][19][20][23][24][25][26][27][28]. However, seep carbonates are rarely found from ancient strata in the mainland China.…”

Section: Hcomentioning

confidence: 99%

“…Released methane can serve as the seeping hydrocarbon source, as well, and lead to the precipitation of seep carbonates. 18 O-depleted. Micro-drilled samples suggest that the weathered yellow parts have more depleted 18 O isotopic compositions than the gray parts (Table 2).…”

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confidence: 99%

“…18 O-depleted. Micro-drilled samples suggest that the weathered yellow parts have more depleted 18 O isotopic compositions than the gray parts (Table 2). These features suggest that the   18 O values have close relationships with the degree of weathering, and thus, hypergene weathering might be the main factor causing the 18 O-depleted isotopic compositions.…”

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First discovery and characterizations of late Cretaceous seep carbonates from Xigaze in Tibet, China

Tong

Chen

2012

Chin. Sci. Bull.

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Hydrocarbon seeps, widely occurring in continental margins, have become increasingly focused owing to their close relationships with gas hydrates, strong greenhouse gas methane, and biological resources in extreme environments. Ancient hydrocarbon seeps have already been recognized from Devonian to Quaternary strata worldwide based on seep carbonates or seep-related fossil chemosynthetic assemblages. However, seep-related deposits are rarely found from ancient strata in the mainland China. Here, we report the first discovery of an ancient seep deposit, specifically late Cretaceous seep carbonates from Xigaze in Tibet, China. Xigaze seep carbonates, occurring as nodules, are enclosed in upper Cretaceous turbidite strata in Xigaze forearc basin. These carbonates are composed of authigenic carbonate (56.2% on average), clastic quartz and feldspar (27.3% on average), and clay minerals (chlorite, illite and smectite, 16.5% on average). Clotted micrites, peloids and framboid pyrites are frequently observed, all of which are common in modern seep carbonates. The carbonates have negative  13 C values varying from 27.7‰ to 4.0‰ (V-PDB), suggesting that thermogenic methane is the primary carbon source. Ce/Ce* values revised by eliminating La effects show no real Ce anomaly, indicating the carbonates were primarily precipitated in a weak reducing environment. Overall, these features provide unequivocal evidences that the seafloor of Xigaze forearc basin developed hydrocarbon seeps in late Cretaceous. seep carbonate, carbon isotope, sedimentary fabric, Xigaze, late Cretaceous Citation:Tong H P, Chen D F. First discovery and characterizations of late Cretaceous seep carbonates

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Section: Hcomentioning

confidence: 99%

Section: Hcomentioning

confidence: 99%

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confidence: 99%

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First discovery and characterizations of late Cretaceous seep carbonates from Xigaze in Tibet, China

Tong

Chen

2012

Chin. Sci. Bull.

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“…Campbell, 2006;Taviani, 2010). They occur as fossil concentrations in isolated mound-like micritic floatstone intercalated within siliciclastic and referred to as chemoherms (Aharon, 1994;Roberts and Aharon, 1994;Majima et al, 2005). By contrast, the El Alcor carbonates form a continuous and homogeneous bioclastic body extending for dozens of square kilometers.…”

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An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Aguirre

Braga

Martín

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Upper Miocene heterozoan carbonates crop out extensively in a NE-SW-trending belt (42 km long and 1.5-8 km wide) along the so-called El Alcor topographic high, from Carmona to Dos Hermanas (Seville, S Spain). These carbonates formed at the southern active margin of the Guadalquivir Basin, the foreland basin of the Betic Cordillera.They change to marls basinward (NE) and to sands landward (SE and SW). Therefore, carbonate production was constrained to a limited area in an otherwise siliciclastic shelf.The carbonates (up to 40 m thick) overlie a gradually coarsening-upward succession of marls followed by silts and sandstones. The carbonate sequence can be divided into three subunits corresponding, from bottom to top, to lowstand, transgressive, and highstands system tracts deposits. The lower subunit, exhibiting extensive trough crossbedding, is interpreted as a shallow-water bar deposit. The intermediate subunit onlaps underlying sediments and was deposited in deeper, low-turbulence conditions. The upper subunit deposits accumulated in a well-oxygenated outer platform based on benthic foraminiferal assemblages. The presence of hummocky and swaley crossstratification in these latter deposits suggests that they were affected by storms.Pervasive fluid-escape structures are also observed throughout the carbonates.The three subunits consist of bioclastic packstones to rudstones made up of abundant fragments of small mytilids. Isotopic data from serpulid polychaete Ditrupa tubes show 13 C-depleted values (up to -16.1‰), whereas  18 O yields normal marine values. Additional isotopic data on shells of scallops, oysters, and small mussels, as well as bulk sediment, show diagenetic alterations. Based on actualistic examples of massive concentrations of mussels, the nearly monospecific composition of the El Alcor deposits, together with negative  13 C values of Ditrupa tubes, indicates that cold seeps A C C E P T E D M A N U S C R I P T

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Bivalve shell horizons in seafloor pockmarks of the last glacial‐interglacial transition: a thousand years of methane emissions in the Arctic Ocean

Ambrose

Panieri

Schneider

et al. 2015

Geochem Geophys Geosyst

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We studied discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (∼1200 m water depth) and western Svalbard (79°00′ N, 06°55′ W) to provide insight into the temporal and spatial dynamics of seabed methane seeps. The shell beds, dominated by two genera of the family Vesicomyidae: Phreagena s.l. and Isorropodon sp., were 20–30 cm thick and centered at 250–400 cm deep in the cores. The carbon isotope composition of inorganic (δ13C from −13.02‰ to +2.36‰) and organic (δ13C from −29.28‰ to −21.33‰) shell material and a two‐end member mixing model indicate that these taxa derived between 8% and 43% of their nutrition from chemosynthetic bacteria. In addition, negative δ13C values for planktonic foraminifera (−6.7‰ to −3.1‰), concretions identified as methane‐derived authigenic carbonates, and pyrite‐encrusted fossil worm tubes at the shell horizons indicate a sustained paleo‐methane seep environment. Combining sedimentation rates with 14C ages for bivalve material from the shell horizons, we estimate the horizons persisted for about 1000 years between approximately 17,707 and 16,680 years B.P. (corrected). The seepage event over a 1000 year time interval was most likely associated with regional stress‐related faulting and the subsequent release of overpressurized fluids.

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Review of fossil chemosynthetic assemblages in Japan

Cited by 87 publications

References 45 publications

First discovery and characterizations of late Cretaceous seep carbonates from Xigaze in Tibet, China

First discovery and characterizations of late Cretaceous seep carbonates from Xigaze in Tibet, China

An enigmatic kilometer-scale concentration of small mytilids (Late Miocene, Guadalquivir Basin, S Spain)

Bivalve shell horizons in seafloor pockmarks of the last glacial‐interglacial transition: a thousand years of methane emissions in the Arctic Ocean

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