Volcanic ash inputs enhance the deep-sea seabed metal-biogeochemical cycle: A case study in the Yap Trench, western Pacific Ocean

Li, Ling; Bai, Shaoping; Li, Jiwei; Wang, Shiming; Tang, Leiwen; Dasgupta, S.; Tang, Yongjie; Peng, Xiaotong

doi:10.1016/j.margeo.2020.106340

Cited by 9 publications

(9 citation statements)

References 56 publications

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“…While we cannot be certain of a biomass origin, the negative values of microbial biomass means that only a relatively small contribution is necessary to result in the observed isotopic shift. Further study would be required to confirm this hypothesis, but evidence suggests that volcanic glass may provide the ideal substrate for microbial growth (Li et al., 2020; Zhang et al., 2017). Indeed, tephra layers have been shown to contain microbial communities which are distinct, more diverse and greater in number than surrounding sediments (Inagaki et al., 2003), with sulfide oxidation suggested as an energy source (Böhnke et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

Tephra Deposition and Bonding With Reactive Oxides Enhances Burial of Organic Carbon in the Bering Sea

Longman

Gernon

Palmer

et al. 2021

Global Biogeochemical Cycles

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Preservation of organic carbon (OC) in marine sediments exerts a major control on the cycling of carbon in the Earth system. In these marine environments, OC preservation may be enhanced by diagenetic reactions in locations where deposition of fragmental volcanic material called tephra occurs. While the mechanisms by which this process occurs are well understood, site‐specific studies of this process are limited. Here, we report a study of sediments from the Bering Sea (IODP Site U1339D) to investigate the effects of marine tephra deposition on carbon cycling during the Pleistocene and Holocene. Our results suggest that tephra layers are loci of OC burial with distinct δ13C values, and that this process is primarily linked to bonding of OC with reactive metals, accounting for ∼80% of all OC within tephra layers. In addition, distribution of reactive metals from the tephra into non‐volcanic sediments above and below the tephra layers enhances OC preservation in these sediments, with ∼33% of OC bound to reactive phases. Importantly, OC‐Fe coupling is evident in sediments >700,000 years old. Thus, these interactions may help explain the observed preservation of OC in ancient marine sediments.

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Section: Discussionmentioning

confidence: 99%

Tephra Deposition and Bonding With Reactive Oxides Enhances Burial of Organic Carbon in the Bering Sea

Longman

Gernon

Palmer

et al. 2021

Global Biogeochemical Cycles

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“…Volcanic ash eventually settles into the deep ocean and comprises an high proportion of seabed sediments 10 , but its impact on carbon cycling in these sediments is not well known. It has been shown that volcanic ash layers harbor a unique microbial community when compared to surrounding clay sediments 11,12 , but other than these preliminary investigations, it is unclear the extent to which this phenomenon occurs. Other work has indicated the ability of volcanic ash to enhance the burial of organic carbon in marine sediments 9 , indicating the possibility of a link between carbon cycling and ash deposition.…”

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confidence: 93%

Chemolithotrophic biosynthesis of organic carbon associated with volcanic ash in the Mariana Trough, Pacific Ocean

Longman

et al. 2023

Commun Earth Environ

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Volcanic ash is a major component of marine sediment, but its effect on the deep-sea carbon cycle remains enigmatic. Here, we analyzed mineralogical compositions and glycerol dialkyl glycerol tetraether (GDGT) membrane lipids in submarine tuffs from the Mariana Trough, demonstrating a fraction of organic carbon associated with volcanic ash is produced in situ. This likely derives from chemolithotrophic communities supported by alteration of volcanic material. Tuff GDGTs are characterized by enrichment of branched GDGTs, as in chemolithotrophic communities. Scanning electron microscope, Raman spectrum and nano secondary ion mass spectrometry analysis demonstrates organic carbon exists around secondary heamatite veins in the altered mafic minerals, linking mineral alteration to chemolithotrophic biosynthesis. We estimate organic carbon production of between 0.7 − 3.7 × 1011 g if all the chemical energy produced by ash alteration was fully utilized by microorganisms. Therefore, the chemolithotrophic ecosystem maintained by ash alteration likely contributes considerably to organic carbon production in the seafloor.

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“…Chemosynthetic microorganisms that are enriched in deep-sea hot springs can fix carbon at high rates, which results in higher primary productivity than in other deep-sea regions ( McNichol et al, 2018 ). Another study related to the Yap Trench revealed that the microorganisms in deep-sea sediments played an important role in the weathering process of volcanic materials ( Li et al, 2020 ). Moreover, typical sulfur-oxidizing bacteria have been detected in deep-sea hydrothermal vents with substantial abundances ( Ding et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Microbial diversity and biogeochemical cycling potential in deep-sea sediments associated with seamount, trench, and cold seep ecosystems

Zhang

Wu²,

Han³

et al. 2022

Front. Microbiol.

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Due to their extreme water depths and unique physicochemical conditions, deep-sea ecosystems develop uncommon microbial communities, which play a vital role in biogeochemical cycling. However, the differences in the compositions and functions of the microbial communities among these different geographic structures, such as seamounts (SM), marine trenches (MT), and cold seeps (CS), are still not fully understood. In the present study, sediments were collected from SM, MT, and CS in the Southwest Pacific Ocean, and the compositions and functions of the microbial communities were investigated by using amplicon sequencing combined with in-depth metagenomics. The results revealed that significantly higher richness levels and diversities of the microbial communities were found in SM sediments, followed by CS, and the lowest richness levels and diversities were found in MT sediments. Acinetobacter was dominant in the CS sediments and was replaced by Halomonas and Pseudomonas in the SM and MT sediments. We demonstrated that the microbes in deep-sea sediments were diverse and were functionally different (e.g., carbon, nitrogen, and sulfur cycling) from each other in the seamount, trench, and cold seep ecosystems. These results improved our understanding of the compositions, diversities and functions of microbial communities in the deep-sea environment.

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Volcanic ash inputs enhance the deep-sea seabed metal-biogeochemical cycle: A case study in the Yap Trench, western Pacific Ocean

Cited by 9 publications

References 56 publications

Tephra Deposition and Bonding With Reactive Oxides Enhances Burial of Organic Carbon in the Bering Sea

Tephra Deposition and Bonding With Reactive Oxides Enhances Burial of Organic Carbon in the Bering Sea

Chemolithotrophic biosynthesis of organic carbon associated with volcanic ash in the Mariana Trough, Pacific Ocean

Microbial diversity and biogeochemical cycling potential in deep-sea sediments associated with seamount, trench, and cold seep ecosystems

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