The composition and the source of hydrocarbons in sediments taken from the tectonically active Andaman Backarc Basin, Indian Ocean

Characteristics and source of polycyclic aromatic hydrocarbons in the surface hydrothermal sediments from two hydrothermal fields of the Central Indian and Mid-Atlantic Ridges

“…In addition, that the LMW PAHs were in a high proportion and the HMW PAHs (>6 rings) were absent were another two major characteristics of the hydrothermal bitumens in present study. This result is similar to the analysis of the bottom sediments at the Central Indian Basin-deformation zone (Chernova et al, 1999(Chernova et al, , 2001Venkatesan et al, 2003), but contrast to those of the hydrothermal deposits Fig. 3.…”

“…As the results of CCA analysis, Si, Mg, S, Ca elements emerged as significant factors which influenced the distribution of the PAHs in this study, and followed by Fe and Zn elements. The presence of biphenyl and fluorene homologues was speculated from a source of volcanic matter in some other previous studies (Chernova et al, 2001). However, from the above CCA analysis, we propose that these LMW PAHs were more related to the Talc formation environment (Si and Mg elements), where the process of the Si-rich hydrothermal fluids mixed with the Mg-rich seawater (Peng et al, 2011).…”

Characteristics and source of inorganic and organic compounds in the sediments from two hydrothermal fields of the Central Indian and Mid-Atlantic Ridges

“…Since the first discovery of hydrothermal petroleum at the Guaymas Basin in the Gulf of California in 1978 (Simoneit et al, 1979), hydrothermal petroleum has been found in hydrothermal sediments in the Escanaba Trough on the southern Gorda Ridge (Kvenvolden et al, 1986), in the Middle Valley of the Juan de Fuca Ridge (Simoneit, 1994), in the Red Sea Michaelis et al, 1990), in the Andaman Basin (Chernova et al, 2001;Venkatesan et al, 2003) and in the Rainbow vent field (Simoneit et al, 2004), as well as in the soft tissues of Bathymodiolus azoricus from three Mid-Atlantic Ridge hydrothermal vents (Serafim et al, 2008). These studies show sedimentary organic matter has been altered by hot fluid and high-temperature flows in hydrothermal systems and the products have moved into shallower and cooler zones near the sea-floor (Simoneit, 1985(Simoneit, , 1993Simoneit, 1987, 1994;Simoneit et al, 1988Simoneit et al, , 2004Leif and Simoneit, 1995;Rushdi and Simoneit, 2002a,b).…”

Component characteristics of polycyclic aromatic compounds in sediments of the South Mid-Atlantic Ridge

“…The concentrations of phenanthrene and pyrene were also high, and about 10%-30% of ΣPAHs. This distribution was also discovered in hydrothermal sediments in the Andaman backarc basin of the Indian Ocean (Chernova et al, 1999(Chernova et al, , 2001Venkatesan et al, 2003), the Kairei hydrothermal field of the Indian Ridge (Li et al, 2012), and the Ashadze hydrothermal field (Morgunova et al, 2012) and the Logatchev hydrothermal field (Li et al, 2012) of the North Atlantic Ridge. On the contrary, the PAHs in sulfide deposits (Simoneit et al, 2004) and chimneys (Simoneit and Fetzer, 1996) of the Rainbow hydrothermal field of the North Atlantic Ridge were characterized by the high concentrations of heavy molecular mass PAHs (e.g., coronene) and only traces of low molecular mass PAHs.…”

“…hydrothermal field have been carried out, for example, in the Escanaba Trough on the southern Gorda Ridge (Kvenvolden et al, 1986;Rushdi and Simoneit, 2002b), the Middle Valley of the Juan de Fuca Ridge (Rushdi and Simoneit, 2002a), the Red Sea (Simoneit et al, 1987;Michaelis et al, 1990), the Andaman Basin (Chernova et al, 2001;Venkatesan et al, 2003), the Rainbow hydrothermal field (Simoneit et al, 2004;Konn et al, 2009), the Lost City hydrothermal field (Delacour et al, 2008;Konn et al, 2009), the Ashadze hydrothermal field (Morgunova et al, 2012), the Kairei hydrothermal field and the Logatchev hydrothermal field (Li et al, 2012) and so on. The concentrations of PAHs are compared between hydrothermal products and normal pelagic sediments by many researchers (Venkatesan et al, 2003;Morgunova et al, 2012).…”