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Geological location of sampling sites in the Carlsberg Ridge (CR). TVG-03 (3.692°N, 63.819°E) denotes near-filed/hydrothermal sediments (about 760 m away from Tianxiu Hydrothermal Field, 3.683°N, 63.833°E) and TVG-06 (2.653°N, 66.398°E) indicates far-filed sediments. Other Indian Ocean ridge systems include the Central Indian Ridge (CIR), the Southwest Indian Ridge (SWIR) and the Southeast Indian Ridge (SEIR).
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Hydrothermal venting has a profound effect on the chemical and biological properties of local and distal seawater and sediments. In this study, lipid biomarkers were analyzed to examine the potential influence of hydrothermal activity on the fate of organic matter (OM) in surface sediments around Tianxiu Hydrothermal Field in the Carlsberg Ridge (C...
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... surface sediments (TVG-03, TVG-06) were collected using a TV-controlled grab in 2018 during Chinese DY49th cruise. Sampling sites are located 730 m and hundreds of kilometers away from Tianxiu Hydrothermal Field, respectively ( Fig. 1) with a water depths of approximately 3 300-3 400 m. Sediment samples were immediately frozen and archived at −20°C until they were freeze-dried at −50°C in the laboratory, and then grounded with an agate mortar and pestle for further ...
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... more n-alcohols in sample TVG-06. The relatively or significantly low fractional abundances of terrestrial n-alkyl lipids suggested an insignificant (by n-alkanes) or minor (by n-alcohols and n-FAs) contribution of terrigenous OM to the sediments (Tables 1-3). This is caused by the long distance between the sampling sites and terrigenous sources (Fig. 1). The remoteness from any landmass could largely prevent fluvial transport of soil and riverine OM to sediments in the open ocean, as evidenced by the significantly low abundances of branched glycerol dialkyl gly- Table 2), respectively. Therefore, the relatively higher terrigenous OM input reconstructed by long chain n-alkyl lipids ...
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... odd carbon-numbered 5,5-diethyl alkanes with carbon chain lengths between C 19 and C 27 were identified by a peak at C 21 or C 23 in the two sediments (Fig. 2, Table 1). The branched alkane series with exclusively odd carbon numbers have been discovered in various geological records, howerver, their biological sources remain uncertain. They are predominantly bacterial precursors, such as sulfide oxidizing bacteria (SOB) ( Kenig et al., 2003Kenig et al., , 2005Simoneit et al., 2004). Here the ...
