Time integrated variation of sources of fluids and seepage dynamics archived in authigenic carbonates from Gulf of Mexico Gas Hydrate Seafloor Observatory

Using sediment geochemistry to infer temporal variation of methane flux at a cold seep in the South China Sea

“…Campbell et al, 2002;Campbell, 2006). A large quantity of methane could release into the water column and atmosphere owing to the glacial-interglacial sea level fluctuations and bottom water temperature changes driving massive gas hydrate destabilization (Watanabe et al, 2008;Westbrook et al, 2009;M enot and Bard, 2010;Han et al, 2014;Feng et al, 2014). As a greenhouse gas, methane is 25 times more effective in trapping heat than carbon dioxide (Chang et al, 2012).…”

“…Geochemical proxies such as stable carbon isotope records of authigenic carbonates have been applied to evaluate the temporal variation of methane seep, owing to their very negative d 13 C (Peckmann and Thiel, 2004;Han et al, 2004Han et al, , 2008Han et al, , 2013Mazumdar et al, 2009Mazumdar et al, , 2011Bayon et al, 2009aBayon et al, , 2013Bayon et al, , 2015Cr emi ere et al, 2013;Tong et al, 2013;Tribovillard et al, 2013;Feng et al, 2014Feng et al, , 2015a. However, such carbonates are most intense at intermediate flow rates, and usually do not form in low and high flux conditions (Luff and Wallmann, 2003;Karaca et al, 2010).…”

Fossiliferous methane‐seep deposits from the Cenozoic Talara Basin in northern Peru

“…) and geochemical evidence suggests that methanogenesis can be an at least episodically prominent process at seeps (Feng et al . ). Since the contents of archaeal biomarkers in the Belén limestone were too low to allow for compound‐specific isotope analysis, it cannot be evaluated if some of the isoprenoids may have been partly derived from methanogenic archaea in addition to methanotrophic archaea.…”

Cold seep status archived in authigenic carbonates: Mineralogical and isotopic evidence from Northern South China Sea

“…Cold-seep carbonates consist of multiple Ca-Mg-carbonate phases. Aragonite, LMC, HMC, protodolomite, dolomite, and ankerite have been reported in cold seep or gas hydrate sites, such as the Gulf of Cadiz Merinero Palomares et al, 2012;Stadnitskaia et al, 2008;Vanneste et al, 2012), Gulf of Mexico (Birgel et al, 2011;Canet et al, 2006;Chen et al, 2007;Feng et al, 2014a;Ferrell and Aharon, 1994;Mansour and Sassen, 2011;Naehr et al, 2009;Roberts et al, 2010), Cascadia margin (Greinert et al, 2001;Kulm and Suess, 1990;Ritger et al, 1987;Teichert et al, 2005aTeichert et al, , 2005b, Norwegian Sea (Hovland et al, 2005;Mazzini et al, 2006), St. Lawrence Estuary (Lavoie et al, 2010), Japan Sea (Nehza et al, 2012), Black Sea (Bahr et al, 2010;Peckmann et al, 2001), Gulf of Guinea (Haas et al, 2010), Mediterranean Sea (Aloisi et al, 2000;Cangemi et al, 2010), Monterey Bay (Stakes et al, 1999), Ryukyu Island (Takeuchi et al, 2007), and South China Sea (SCS) (Chen et al, 2005(Chen et al, , 2006Ge et al, 2010;Han et al, 2008Han et al, , 2013Lu et al, 2010;Tong et al, 2013;Wang et al, 2014Wang et al, , 2012. In the cold seep area of Hydrate Ridge, two zones of carbonate phases have been identified: (1) the aragonite-and HMC-rich zone, located near the seafloor, and (2) the HMC-and (proto) dolomite-rich zone, which i...…”

“…U/Th dating results provide the age of cold seep activity (Bayon et al, 2009;Teichert et al, 2003;Tong et al, 2013). The species of archaea and bacteria that thrive in the cold seep sites are indicated by the biomarkers in the cold-seep carbonates (Birgel et al, 2011;Feng et al, 2014a;Ge et al, 2011Ge et al, , 2015Naehr et al, 2009).…”