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

Late Pleistocene–Holocene sedimentation surrounding an active seafloor gas-hydrate and cold-seep field on the Northern Gulf of Mexico Slope

2010 ◽  
Vol 278 (1-4) ◽  
pp. 43-53 ◽  
Author(s):  
Wesley C. Ingram ◽  
Stephen R. Meyers ◽  
Charlotte A. Brunner ◽  
Christopher S. Martens
Keyword(s):  
Gulf Of Mexico ◽  
Late Pleistocene ◽  
Gas Hydrate ◽  
Cold Seep ◽  
Northern Gulf Of Mexico

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 Gas Seeps at the Edge of the Gas Hydrate Stability Zone on Brazil’s Continental Margin

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 193 ◽  
Author(s):  
Marcelo Ketzer ◽  
Daniel Praeg ◽  
Maria A.G. Pivel ◽  
Adolpho H. Augustin ◽  
Luiz F. Rodrigues ◽  
...  
Keyword(s):  
Gravitational Collapse ◽  
Continental Margin ◽  
Gas Hydrate ◽  
Deep Sea ◽  
Rio Grande ◽  
Cold Seep ◽  
Stability Zone ◽  
The Stability ◽  
Sea Fan ◽  
Hydrate Stability

Gas hydrate provinces occur in two sedimentary basins along Brazil’s continental margin: (1) The Rio Grande Cone in the southeast, and (2) the Amazon deep-sea fan in the equatorial region. The occurrence of gas hydrates in these depocenters was first detected geophysically and has recently been proven by seafloor sampling of gas vents, detected as water column acoustic anomalies rising from seafloor depressions (pockmarks) and/or mounds, many associated with seafloor faults formed by the gravitational collapse of both depocenters. The gas vents include typical features of cold seep systems, including shallow sulphate reduction depths (<4 m), authigenic carbonate pavements, and chemosynthetic ecosystems. In both areas, gas sampled in hydrate and in sediments is dominantly formed by biogenic methane. Calculation of the methane hydrate stability zone for water temperatures in the two areas shows that gas vents occur along its feather edge (water depths between 510 and 760 m in the Rio Grande Cone and between 500 and 670 m in the Amazon deep-sea fan), but also in deeper waters within the stability zone. Gas venting along the feather edge of the stability zone could reflect gas hydrate dissociation and release to the oceans, as inferred on other continental margins, or upward fluid flow through the stability zone facilitated by tectonic structures recording the gravitational collapse of both depocenters. The potential quantity of venting gas on the Brazilian margin under different scenarios of natural or anthropogenic change requires further investigation. The studied areas provide natural laboratories where these critical processes can be analyzed and quantified.

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 Manganese enrichments near a large gas‐hydrate and cold‐seep field: a record of past redox and sedimentation events

2016 ◽  
Vol 2 (2) ◽  
pp. 142-153 ◽  
Author(s):  
Wesley C. Ingram ◽  
Stephen R. Meyers ◽  
Zhizhang Shen ◽  
Huifang Xu ◽  
Christopher S. Martens
Keyword(s):  
Gas Hydrate ◽  
Cold Seep

Diagenesis of magnetic minerals in a gas hydrate/cold seep environment off the Krishna–Godavari basin, Bay of Bengal

2013 ◽  
Vol 340 ◽  
pp. 57-70 ◽  
Author(s):  
P. Dewangan ◽  
N. Basavaiah ◽  
F.K. Badesab ◽  
A. Usapkar ◽  
A. Mazumdar ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Bay Of Bengal ◽  
Cold Seep ◽  
Magnetic Minerals ◽  
Godavari Basin

Gas hydrate formation and accumulation potential in the Qiangtang Basin, northern Tibet, China

2013 ◽  
Vol 73 ◽  
pp. 186-194 ◽  
Author(s):  
Xiugen Fu ◽  
Jian Wang ◽  
Fuwen Tan ◽  
Xinglei Feng ◽  
Dong Wang ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Hydrate Formation ◽  
Qiangtang Basin ◽  
Northern Tibet ◽  
Accumulation Potential ◽  
Gas Hydrate Formation

scholarly journals Cold-Water Corals in Gas Hydrate Drilling Cores from the South China Sea: Occurrences, Geochemical Characteristics and Their Relationship to Methane Seepages

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 742
Author(s):  
Yinan Deng ◽  
Fang Chen ◽  
Niu Li ◽  
Meng Jin ◽  
Jun Cao ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Bottom Water ◽  
Cold Water ◽  
The South China Sea ◽  
Cold Seep ◽  
Authigenic Carbonates ◽  
Δ13c Values ◽  
Fluid Seepage

Cold-water corals (CWCs) are frequently found at cold seep areas. However, the relationship between fluid seepage and CWC development is not clear. Here, for the first time, we report the occurrences, species identification, mineralogy, carbon and oxygen isotopes, as well as elemental compositions of fossil CWC skeletons from gas-hydrate-bearing sediment in drilling cores from the South China Sea (SCS). Three sites (GMGS-08, GMGS-09B, and GMGS-16) were investigated but CWCs were only found at one site (GMGS-09B). Interestingly, the CWCs were found in three horizons and they were all embedded with authigenic carbonates. Three genera of fossil CWCs (Crispatotrochus sp., Solenosmilia sp. and Enallopsammia sp.) were identified. The CWC fragments are predominantly aragonite. The CWCs exhibit δ13C values between −8.4‰ and −0.6‰ that are significantly higher than δ13C values of the associated seep carbonates (δ13C values with an average of −55.6‰, n = 19), which indicates a carbon source other than methane for the CWCs. It appears that authigenic carbonates provide a substratum for coral colonization. Bathymetric high points, appropriate water temperature and stronger bottom-water currents at site GMGS-09B might be crucial to keep conditions favorable for the growth of CWCs in the studied area. In addition, high trace-element concentrations of Cr, Ni, Pb, U, Ba, Th, and Sr suggest that the CWCs are influenced by strong fluid seepage that can reach the water-sediment interface, and associated microbial activity. Hence, it also becomes evident that CWCs in hydrocarbon-rich seepage areas not only provide a critical constraint on the impact of fluid emission on the bottom water chemistry, but also are likely to be very precise recorders of the end time of cold seep activity.

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