scholarly journals Cold seep carbonate mounds with Vesicomya (Calyptogena) kawamurai (Bivalvia: Vesicomyidae) in slope-mud fades of the Pliocene forearc basin of the Sagara-Kakegawa area, central Japan

2003 ◽  
Vol 7 (4) ◽  
pp. 313-328 ◽  
Author(s):  
TAKAMI NOBUHARA
Keyword(s):  
Cold Seep ◽  
Forearc Basin ◽  
Carbonate Mounds ◽  
Central Japan ◽  
Seep Carbonate

THE DISCOVERY OF COLD SEEP CARBONATE IN SHUANGHU REGION, QIANGTANG BASIN AND ITS IMPLICATIONS FOR GAS HYDRATE ACCUMULATION

2014 ◽  
Vol 33 (2) ◽  
pp. 105-110
Author(s):  
Yanju LI ◽  
Jiannan SHI ◽  
Lidong ZHU ◽  
Xiugen FU ◽  
Wenguang YANG ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Cold Seep ◽  
Qiangtang Basin ◽  
Seep Carbonate

Worm tubes in an allochthonous cold-seep carbonate from lower Oligocene rocks of western Washington

2000 ◽  
Vol 74 (6) ◽  
pp. 992-999 ◽  
Author(s):  
James L. Goedert ◽  
Jörn Peckmann ◽  
Joachim Reitner
Keyword(s):  
Cold Seep ◽  
Carbonate Content ◽  
Microbial Oxidation ◽  
Carbonate Cements ◽  
Lower Oligocene ◽  
Tube Worms ◽  
Oxidation Of Hydrocarbons ◽  
High Carbonate ◽  
Depositional Setting ◽  
Seep Carbonate

Tubes suspected to be those of vestimentiferan worms are abundant in carbonate boulders at one locality in the lower Oligocene part of the Lincoln Creek Formation along the Canyon River, Grays Harbor County, Washington. The largest tubes exhibit the same general orientation and are arranged in clusters. The tube walls are preserved as aragonite that is, in some cases, replaced by silica. The original tube walls either had a high carbonate content or were indurated very early by aragonite mineralization of the organic wall. The carbonate cements around, on, and inside of the tubes were precipitated due to the microbial oxidation of hydrocarbons at a cold-seep. After lithification, the carbonate fragmented as it slid or slumped, along with other sedimentary debris, downslope into deeper waters. This is one of the few reports of an ancient cold-seep chemosynthetic community dominated by tube worms, and the third report of an allochthonous cold-seep carbonate within a deep-water depositional setting.

scholarly journals U–Th stratigraphy of a cold seep carbonate crust

2009 ◽  
Vol 260 (1-2) ◽  
pp. 47-56 ◽  
Author(s):  
G. Bayon ◽  
G.M. Henderson ◽  
M. Bohn
Keyword(s):  
Cold Seep ◽  
Carbonate Crust ◽  
Seep Carbonate

scholarly journals A new occurrence of the Early Jurassic brachiopod Anarhynchia from the Canadian Cordillera confirms its membership in chemosynthesis-based ecosystems

2017 ◽  
Vol 54 (12) ◽  
pp. 1179-1193 ◽  
Author(s):  
József Pálfy ◽  
Zsófia Kovács ◽  
Gregory D. Price ◽  
Attila Vörös ◽  
Gary G. Johannson
Keyword(s):  
Carbon Isotopic Composition ◽  
Early Jurassic ◽  
Cold Seep ◽  
Cold Seeps ◽  
Carbonate Sediments ◽  
Microbial Oxidation ◽  
Carbonate Cement ◽  
Carbon Isotopic ◽  
Oxidation Of Methane ◽  
Seep Carbonate

Cold seeps, where seepage of hydrocarbon-rich fluids occurs in the sea floor, are sites that harbor highly specialized ecosystems associated with distinctive carbonate sediments. Although their Mesozoic record is scarce and patchy, it commonly includes dimerelloid rhynchonellide brachiopods. Here we report a monospecific assemblage of Anarhynchia from a limestone boulder of early Pliensbachian (Early Jurassic) age in the Inklin Formation of the Whitehorse Trough in the Stikine terrane, from a locality at Atlin Lake in northern British Columbia. Specimens are among the largest known Mesozoic brachiopods, up to 9 cm in length, and described here as Anarhynchia smithi n. sp. Early precipitated carbonate cement phases of the limestone have carbon isotopic composition highly depleted in 13C, indicative of the influence of microbial oxidation of methane derived from a cold seep. Carbonate petrography of the banded-fibrous cement and other characteristic components supports this paleoenvironmental inference. Volcanogenic detrital grains in the matrix are indistinguishable from those in the sandstone layers in the siliciclastic sequence, suggesting that the seep carbonate is broadly coeval with the enclosing conglomerate. The new record extends the geographic range and species-level diversity of the genus, but supports its endemism to the East Pacific and membership in chemosynthesis-based ecosystems. The distribution of three distinct but congeneric species suggests that allopatric speciation occurred at separate sites along the active margin of western North America and Anarhynchia was restricted to seep and vent habitats in the Early Jurassic.

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