Identification of organic compounds in ocean basement fluids

LaRowe, Douglas E.; Koch, Boris P.; Robador, Alberto; Witt, Matthias; Ksionzek, Kerstin B.; Amend, Jan P.

doi:10.1016/j.orggeochem.2017.07.017

Cited by 13 publications

(4 citation statements)

References 23 publications

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“…Compared to 35-45 µM in deep seawater, cool hydrothermal DOC concentrations can be <15 µM (Lang et al, 2006;Lin et al, 2012;Shah Walter et al, 2018;Lin et al, 2019). This DOC removal has been attributed to selective oxidation on the basis of a concurrent loss of oxygen, the 14 C content of the remaining organic matter and characterization by NMR and FT-ICR-MS (LaRowe et al, 2017b;Shah Walter et al, 2018;Lin et al, 2019). The DOC removed in the crustal subsurface has a 14 C age of up to 4,300 years at North Pond, indicating a long residence time in the open ocean before oxidation by basement microorganisms, underscoring the importance of treating OC degradation as an ecosystem property.…”

Section: Ocean Basement Fluidsmentioning

confidence: 99%

The fate of organic carbon in marine sediments - New insights from recent data and analysis

LaRowe

Arndt

Bradley

et al. 2020

Earth-Science Reviews

163

156

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Section: Ocean Basement Fluidsmentioning

confidence: 99%

The fate of organic carbon in marine sediments - New insights from recent data and analysis

LaRowe

Arndt

Bradley

et al. 2020

Earth-Science Reviews

163

156

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“…A chemical pH buffer was used to maintain a constant pH of approximately 7.5 during the course of the experiments, which approximates the pH of many olivine‐bearing environments (e.g., LaRowe et al., ; Schopka, Derry, & Arcilla, ; Stefánsson, Arnórsson, & Sveinbjörnsdóttir, ). Of the available pH buffers, a mixture of TRIS ((HOCH 2 ) 3 CNH 2 ) and HCl was selected because (a) TRIS ions do not complex Mg to a significant degree (Hanlon, Watt, & Westhead, ), (b) TRIS ions do not cause a prohibitively large interference with the analytical techniques utilized to measure solute concentrations (see Section 2.4 below), and (c) the mixture of high purity TRIS (J.T.…”

Section: Methodsmentioning

confidence: 99%

The kinetics of siderophore‐mediated olivine dissolution

et al. 2019

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Silicate minerals represent an important reservoir of nutrients at Earth's surface and a source of alkalinity that modulates long‐term geochemical cycles. Due to the slow kinetics of primary silicate mineral dissolution and the potential for nutrient immobilization by secondary mineral precipitation, the bioavailability of many silicate‐bound nutrients may be limited by the ability of micro‐organisms to actively scavenge these nutrients via redox alteration and/or organic ligand production. In this study, we use targeted laboratory experiments with olivine and the siderophore deferoxamine B to explore how microbial ligands affect nutrient (Fe) release and the overall rate of mineral dissolution. Our results show that olivine dissolution rates are accelerated in the presence of micromolar concentrations of deferoxamine B. Based on the non‐linear decrease in rates with time and formation of a Fe3+‐ligand complex, we attribute this acceleration in dissolution rates to the removal of an oxidized surface coating that forms during the dissolution of olivine at circum‐neutral pH in the presence of O2 and the absence of organic ligands. While increases in dissolution rates are observed with micromolar concentrations of siderophores, it remains unclear whether such conditions could be realized in natural environments due to the strong physiological control on microbial siderophore production. So, to contextualize our experimental results, we also developed a feedback model, which considers how microbial physiology and ligand‐promoted mineral dissolution kinetics interact to control the extent of biotic enhancement of dissolution rates expected for different environments. The model predicts that physiological feedbacks severely limit the extent to which dissolution rates may be enhanced by microbial activity, though the rate of physical transport modulates this limitation.

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“…The high temperature and pressures of hydrothermal systems can degrade organic matter to gaseous end products (Hawkes et al, 2015;McCollom et al, 1999McCollom et al, , 2001, resulting in DOM that have distinctive organic chemical characteristics. Thermally altered DOM often has low molecular diversity and mass, consists of formula with low O/C ratios and AI mod , but a high proportion of heteroatomic compounds, particularly those containing sulfur (Butturini et al, 2020;Hawkes et al, 2016;LaRowe et al, 2017;Longnecker et al, 2018;Rossel et al, 2017), as observed in hot spring discharge (Figure 3). FDOM is often a ubiquitous fraction of the DOM in hydrothermal fluids (Nye et al, 2020), since aromatic DOM is largely resistant to complete thermal degradation (McCollom et al, 1999(McCollom et al, , 2001.…”

Section: Hot Spring Dischargementioning

confidence: 99%

Biogeochemical Responses to Mixing of Glacial Meltwater and Hot Spring Discharge in the Mount St. Helens Crater

et al. 2022

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The mixing of geothermal waters and glacier meltwater is a widespread phenomenon but its chemical and microbiological effects on water quality are not fully understood. Approximately one fifth of the 1,443 known subaerial Holocene volcanic centers are glaciated or have permanent snowfields (Curtis & Kyle, 2017). These glaciated volcanoes occur on every continent and are particularly prominent in plate boundary and hotspot volcanic regions including, for example, the Cascades of the American northwest, Alaska, the Andes, Iceland, and the Kamchatka peninsula of Russia (Curtis & Kyle, 2017). Furthermore, subglacial volcanoes and geothermal heat are renowned for producing large quantities of meltwater that can result in glacial outburst floods, as is commonly observed in Iceland (Björnsson, 2002;Tomasson, 1996) and other regions around the world (Major & Newhall, 1989;Pierson et al., 1990). Volcanoes and geothermal sites are widespread in the heavily glaciated region of Antarctica, including at high elevations and along the margins of the continent in ice-free terrain (Fraser et al., 2014), as well as beneath the West Antarctic Ice Sheet, where 138 volcanoes have been identified (De Vries et al., 2018). Similar systems may also exist on other planetary bodies. For example, volcanism and glaciation have been dominant

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Identification of organic compounds in ocean basement fluids

Cited by 13 publications

References 23 publications

The fate of organic carbon in marine sediments - New insights from recent data and analysis

The fate of organic carbon in marine sediments - New insights from recent data and analysis

The kinetics of siderophore‐mediated olivine dissolution

Biogeochemical Responses to Mixing of Glacial Meltwater and Hot Spring Discharge in the Mount St. Helens Crater

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