Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Dong, Feng; Roberts, Harry H.

doi:10.1016/j.epsl.2011.06.017

Cited by 38 publications

(51 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LMC, which is conspicuously absent from normal modern marine settings as non-skeletal carbonates, can be observed in special cold seeps [59]. Which carbonate minerals precipitated at hydrocarbon seeps is believed to be related with the seepage speed to a certain extent.…”

Section: Formation Conditions Of Xigaze Seep Carbonatesmentioning

confidence: 96%

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

Tong

Chen

2012

Chin. Sci. Bull.

View full text Add to dashboard Cite

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

show abstract

Section: Formation Conditions Of Xigaze Seep Carbonatesmentioning

confidence: 96%

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

Tong

Chen

2012

Chin. Sci. Bull.

View full text Add to dashboard Cite

show abstract

“…The presence of small amounts of LMC in one sample of Structure I (sample B-10) suggests the influence of locally active brine seepage (cf. Feng and Roberts, 2011).…”

Section: The Evolution Of Seep Fluids At Gc140mentioning

confidence: 99%

“…It is suggested that the GOM brine has a low Mg/Ca ratio (<1) and with low concentrations of sulfide and little to no sulfate (cf. Feng and Roberts, 2011;Joye et al, 2005). This interpretation is also supported by the occurrence of NaCl with well-developed crystals.…”

Section: Formation Condition and Fluid Sourcementioning

confidence: 99%

See 1 more Smart Citation

Tracing the evolution of seep fluids from authigenic carbonates: Green Canyon, northern Gulf of Mexico

Bian

Dong

Roberts

et al. 2013

Marine and Petroleum Geology

Self Cite

View full text Add to dashboard Cite

“…The presence of barite in association with seep carbonates is not uncommon (e.g., Greinert et al, 2002;Aloisi et al, 2004;Feng and Roberts, 2011). Barium contained in cold seep fluids is often thought to originate from the dissolution of barite contained in deeper buried sediment, below the sulfate depletion level (SMTZ) of marine sediments (Torres et al, 2003;Arning et al, 2015).…”

Section: Element 2 Of the Elementary Sequence: Micritic Rim (N°3)mentioning

confidence: 99%

Mechanisms of biogenic gas migration revealed by seep carbonate paragenesis, Panoche Hills, California

Blouet¹,

Imbert²,

Foubert³

2017

Bulletin

View full text Add to dashboard Cite

A comprehensive study of seep carbonates at the top of the organic-rich Maastrichtian to Danian Moreno Formation in the Panoche Hills (California) reveals the mechanisms of generation, expulsion, and migration of biogenic methane that fed the seeps. Two selected outcrops show that seep carbonates developed at the tip of sand dykes intrude up into the Moreno Formation from deeper sandbodies. Precipitation of methane-derived cements occurred in a succession of up to 10 repeated elementary sequences, each starting with a corrosion surface followed by dendritic carbonates, botryoidal aragonite, aragonite fans, and finally laminated micrite. Each element of the sequence reflects three stages. First, a sudden methane pulse extended up into the oxic zone of the sediments, leading to aerobic oxidation of methane and carbonate dissolution. Second, after consumption of the oxygen, anaerobic oxidation of methane coupled with sulfate reduction triggered carbonate precipitation. Third, progressive diminishment of the methane seepage led to the deepening of the reaction front in the sediment and the lowering of precipitation rates. Carbonate isotopes, with d 13 C as low as -51‰ Peedee belemnite, indicate a biogenic origin for the methane, whereas a one-dimensional basin model suggests that the Moreno Formation was in optimal thermal conditions for bacterial methane generation at the time of seep carbonate precipitation. Methane pulses are interpreted to reflect drainage by successive episodes of sand injection into the gas-generating shale of the Moreno Formation. The seep carbonates of the Panoche Hills can thus be viewed as a record of methane production from a biogenic source rock by multiphase hydraulic fracturing. A U T H O R S

show abstract

Geochemical characteristics of the barite deposits at cold seeps from the northern Gulf of Mexico continental slope

Cited by 38 publications

References 46 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

Tracing the evolution of seep fluids from authigenic carbonates: Green Canyon, northern Gulf of Mexico

Mechanisms of biogenic gas migration revealed by seep carbonate paragenesis, Panoche Hills, California

Contact Info

Product

Resources

About