Expedition 385 summary

Teske, Andreas; Lizarralde, D.; Höfig, T.W.; Aiello, Ivano; Ash, Janine L.; Bojanova, D.P.; Buatier, Martine; Edgcomb, Virginia P.; Galerne, Christophe; Gontharet, S.; Heuer, Verena B; Jiang, Shijun; Kars, Myriam; Singh, Suniti; Kim, J.; Koornneef, L.M.T.; Marsaglia, Kathleen M.; Meyer, N.R.; Morono, Yuki; Negrete-Aranda, R.; Neumann, Florian; Pastor, Lucie; Peña-Salinas, M.E.; Cruz, L.L. Pérez; Ran, Lihua; Riboulleau, Armelle; Sarao, J.A.; Schubert, F.; Stock, J. M.; Toffin, Laurent; Xie, W.; Yamanaka, Toshiro; Zhuang, Guang‐Chao

doi:10.14379/iodp.proc.385.101.2021

Cited by 21 publications

(44 citation statements)

References 84 publications

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“…Site U1545 (proposed Site GUAYM-01B) is located at 27°38.2315′N, 111°53.3396′W, ~52 km northwest of the axial graben of the northern Guaymas Basin spreading segment (see Figure F1 in the Expedition 385 summary chapter [Teske et al, 2021b]). The primary objective for this site is shared with Site U1546, located just 1.1 km away (Figure F3).…”

Section: Background and Objectivesmentioning

confidence: 99%

Site U1545

Teske¹,

Lizarralde²,

Höfig³

et al. 2021

Proceedings of the International Ocean Discovery Program

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Section: Background and Objectivesmentioning

confidence: 99%

Site U1545

Teske¹,

Lizarralde²,

Höfig³

et al. 2021

Proceedings of the International Ocean Discovery Program

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“…For sites U1545C and U1546D, the original objective in terms of microbiology was to elucidate the impact of sill intrusion on microbial activity at sites with similar sediment composition, TOC content (scattering between 1 and 2.5%) and stratigraphy but different sill intrusion histories. During the expedition downhole, temperature measurements indicated that the sill located at Site U1546D had reached thermal equilibrium with the surrounding sediment (Teske et al, 2021), so there is no local heating effect at present. Both sites have relatively high SRR near the seafloor, with maxima of 5.1 and 48.5 nmol cm −3 d −1 and with minima above MQL of 0.2 and 0.4 pmol cm −3 d −1 for sites U1545C and U1546D, respectively (Figures 3A,B).…”

Section: Sulfate Reduction Rates At Sites U1545c and U1546dmentioning

confidence: 98%

“…One of the main objectives of the International Ocean Discovery Program (IODP) Expedition 385 (Guaymas Basin Tectonics and Biosphere) was the investigation of microbial communities and activity in the deep subseafloor biosphere of Guaymas Basin. Detailed drill site descriptions are given by Teske et al (2020Teske et al ( , 2021 (Table 1). Sites U1545C and U1546D have a similar stratigraphy since the distance between these two sites is only about 1.1 km.…”

Section: Introductionmentioning

confidence: 99%

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Biological Sulfate Reduction in Deep Subseafloor Sediment of Guaymas Basin

et al. 2022

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Sulfate reduction is the quantitatively most important process to degrade organic matter in anoxic marine sediment and has been studied intensively in a variety of settings. Guaymas Basin, a young marginal ocean basin, offers the unique opportunity to study sulfate reduction in an environment characterized by organic-rich sediment, high sedimentation rates, and high geothermal gradients (100–958°C km−1). We measured sulfate reduction rates (SRR) in samples taken during the International Ocean Discovery Program (IODP) Expedition 385 using incubation experiments with radiolabeled 35SO42− carried out at in situ pressure and temperature. The highest SRR (387 nmol cm−3 d−1) was recorded in near-surface sediments from Site U1548C, which had the steepest geothermal gradient (958°C km−1). At this site, SRR were generally over an order of magnitude higher than at similar depths at other sites (e.g., 387–157 nmol cm−3 d−1 at 1.9 mbsf from Site U1548C vs. 46–1.0 nmol cm−3 d−1 at 2.1 mbsf from Site U1552B). Site U1546D is characterized by a sill intrusion, but it had already reached thermal equilibrium and SRR were in the same range as nearby Site U1545C, which is minimally affected by sills. The wide temperature range observed at each drill site suggests major shifts in microbial community composition with very different temperature optima but awaits confirmation by molecular biological analyses. At the transition between the mesophilic and thermophilic range around 40°C–60°C, sulfate-reducing activity appears to be decreased, particularly in more oligotrophic settings, but shows a slight recovery at higher temperatures.

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“…During International Ocean Discovery Program (IODP) Expedition 385, eight sites were drilled in Guaymas Basin with the broad goal of unraveling the physical, chemical, and biological processes that regulate the cycling of sedimentary carbon in a region where extensive chemical, temperature, and lithologic gradients impact both biotic and abiotic processes that release and/or sequester carbon in the sediment (Teske et al, 2021a). Emplaced volcanic sills that originate at the spreading center significantly alter the host sediment and control hydrothermal circulation patterns in Guaymas Basin (Einsele et al, 1980).…”

Section: Introductionmentioning

confidence: 99%