Controlling factors on patterns of dissolved organic carbon and volatile fatty acids in a submarine mud volcano offshore southwestern Taiwan

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Fältnamn	Indikatorer	Metadata
000		04065naa a2200457 4500
001		oai:DiVA.org:su-220941
003		SwePub
008		230918s2023 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2209412 URI
024	7	a https://doi.org/10.3389/feart.2023.12100882 DOI
040		a (SwePub)su
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Chen, Nai-Chen,d 1985-u Stockholms universitet,Institutionen för geologiska vetenskaper,National Taiwan University, Taiwan4 aut0 (Swepub:su)nach3528
245	1 0	a Controlling factors on patterns of dissolved organic carbon and volatile fatty acids in a submarine mud volcano offshore southwestern Taiwan
264	1	c 2023
338		a print2 rdacarrier
520		a Dissolved organic carbon (DOC) and volatile fatty acids (VFAs) play key roles in the carbon cycling of marine sediment. Both microbially or thermally activated cracking of organic matter often produces high quantities of DOC and VFAs. To uncover the distribution pattern of DOC and VFAs in sediments under both impacts, a submarine mud volcano (SMV), was chosen to denote a model system that could witness how microbial activities react under the mixing of seawater and deeply-sourced fluids in a subsurface environment. We examined the concentration profiles of DOC and several VFAs (lactate, formate, acetate, propionate, and butyrate) in pore water, covering both sulfate reduction and methanogenesis zones, and further numerically modeled six porewater species (DOC, bromide, calcium, magnesium, ammonium, and total alkalinity) to quantify their fluxes from depth as well as the rates of in-situ microbial processes. Apparently, bulk DOC concentrations fluctuated with depths, probably primarily controlled by in situ microbial processes. Lactate was detectable in some samples, while propionate and butyrate were under detection limit. Acetate and formate concentrations were consistently and uniformly low throughout all biogeochemical zones, with a slightly increasing trend with depth at the center of the SMV, suggesting active utilization and turnover by the terminal steps of organic matter mineralization. The numerical modeling suggests that most DOC patterns were primarily influenced by in-situ organic matter degradation, while the impact of upward migrating fluid become more significant at center sites. The calculation of the Gibbs energy of metabolic redox reactions reveals that acetoclastic sulfate reduction yields the highest energy throughout sediment columns and may co-exist with methanogenesis below sulfate reduction zone. In contrast, acetoclastic methanogenesis yields higher energy within sulfate reduction zone than below that region, suggesting it is thermodynamically feasible to co-occur with sulfate reduction in dynamic SMV environments.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geokemi0 (SwePub)105062 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geochemistry0 (SwePub)105062 hsv//eng
653		a dissolved organic carbon
653		a volatile fatty acids
653		a submarine mud volcano
653		a deep fluid
653		a numerical modeling
653		a gibbs free energy
700	1	a Yang, Tsanyao Frank4 aut
700	1	a Liou, Ya-Hsuan4 aut
700	1	a Lin, Huei-Ting Tina4 aut
700	1	a Hong, Wei-Li,d 1982-u Stockholms universitet,Institutionen för geologiska vetenskaper4 aut0 (Swepub:su)weho1955
700	1	a Lin, Saulwood4 aut
700	1	a Su, Chih-Chieh4 aut
700	1	a Lin, Li-Hung4 aut
700	1	a Wang, Pei-Ling4 aut
710	2	a Stockholms universitetb Institutionen för geologiska vetenskaper4 org
773	0	t Frontiers in Earth Scienceg 11q 11x 2296-6463
856	4	u https://doi.org/10.3389/feart.2023.1210088y Fulltext
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-220941
856	4 8	u https://doi.org/10.3389/feart.2023.1210088

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