Hydrothermal sulfidation of biogenic magnetite produces framboid-like pyrite DOI Creative Commons
Eric A. Runge, Muammar Mansor, Tsz Ho Chiu

et al.

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: May 15, 2024

Abstract Biogenic magnetite is a potential biosignature for microbial iron cycling in hydrothermal sulfide systems, critical environments unraveling the emergence and early evolution of life. However, preservation biogenic under conditions poorly understood. Here, we show that sulfidation abiogenic (sulfide/iron = 4, 80 °C) yields pyrite with various distinct morphologies, including framboid-like spheroids. We demonstrate variability morphologies resulted from modulation pyritization rates by interrelated effects between organic matter elemental sulfur (crystalline or colloidal). Notably, pyrite, commonly considered fingerprint cycling, was exclusively produced (i.e., matter-associated) iron-cycling microorganisms. Thus, can additionally be taphonomic enabling better understanding Earth’s biosphere deep time.

Language: Английский

Organic compounds in geological hydrothermal systems: A critical review of molecular transformation and distribution DOI
Huiyuan Xu, Quanyou Liu, Zhijun Jin

et al.

Earth-Science Reviews, Journal Year: 2024, Volume and Issue: 252, P. 104757 - 104757

Published: March 26, 2024

Language: Английский

Citations

14
The rocky road to organics needs drying DOI Creative Commons
M. Andréani, Gilles Montagnac, Clémentine Fellah

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Jan. 21, 2023

Abstract How simple abiotic organic compounds evolve toward more complex molecules of potentially prebiotic importance remains a missing key to establish where life possibly emerged. The limited variety organics, their low concentrations and the possible pathways identified so far in hydrothermal fluids have long hampered unifying theory origin for emergence on Earth. Here we present an alternative road synthesis diversification environments, which involves magmatic degassing water-consuming mineral reactions occurring microcavities. This combination gathers gases (N 2 , H CH 4 3 SH) various polyaromatic materials associated with nanodiamonds products olivine hydration (serpentinization). endogenous assemblage results from re-speciation drying cooling C–O–S–H–N entrapped below 600 °C–2 kbars rocks forming present-day oceanic lithosphere. Serpentinization dries out system macromolecular carbon condensation, while pods keep ingredients trapped until they are remobilized further at shallower levels. Results greatly extend our understanding forms available environments open new encompassing role minerals drying. Such processes expected other planetary bodies wherever olivine-rich systems get cooled down hydrated.

Language: Английский

Citations

19
Tectonic controls on melt production and crustal architecture during magma-poor seafloor spreading DOI Creative Commons

Leila Mezri,

Javier García‐Pintado, Marta Pérez‐Gussinyé

et al.

Earth and Planetary Science Letters, Journal Year: 2024, Volume and Issue: 628, P. 118569 - 118569

Published: Jan. 21, 2024

Slow and ultraslow spreading oceanic crust consists of a heterogenous mixture serpentinised mantle magmatic rocks. In these environments, both crustal architecture faulting mode have been attributed to the interplay between magmatism tectonics. Numerical models investigated how variations in melt supply influence However, tectonics influences production formation heterogeneous is not well understood. Here, we use 2D numerical analyze coupled tectonics, melting, emplacement serpentinization interact. Our model shows that ocean loading density promote fault offsets durations. We focus on ultraslow, magma-poor ridges, particular Southwest Indian Ridge at 64°30′ East, which exhibits thickening along detachment faults interpreted as deep front. reproduce observed bathymetry, seafloor morphology, shaped by alternating flip-flop detachments, thickness variations, ∼3–6 km, associated with along-fault serpentinisation. find this environment, where serpentinized dominates composition effects are limited, consequence changes flow patterns response faulting. Early evolution leads slow-down upwelling decrease. Late life-cycle, antithetic its footwall trigger enhanced upwelling, increasing production. During tectonically induced spatio-temporal magma serpentinisation contribute magnetic signature seafloor.

Language: Английский

Citations

6
Hydrothermal flow and serpentinization in oceanic core complexes controlled by mafic intrusions DOI
Hanchao Jian, J. P. Canales, R. A. Dunn

et al.

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(6), P. 566 - 571

Published: May 6, 2024

Language: Английский

Citations

6
Controls on Mineral Formation in High pH Fluids From the Lost City Hydrothermal Field DOI Creative Commons
Karmina A. Aquino, Gretchen L. Früh‐Green, Stefano M. Bernasconi

et al.

Geochemistry Geophysics Geosystems, Journal Year: 2024, Volume and Issue: 25(2)

Published: Feb. 1, 2024

Abstract Although the serpentinite‐hosted Lost City hydrothermal field (LCHF) was discovered more than 20 years ago, it remains unclear whether and how presence of microbes affects mineralogy textures chimney structures. Most chimneys have flow comprised mineral walls bounding paleo‐channels, which are preserved in inactive vent structures to a varying degree. Brucite lines internal part these channels, while aragonite dominates exterior. Calcite is also present locally, mostly associated with brucite. Based on combination microscopic geochemical analyses, we interpret brucite, calcite, as primary minerals that precipitate abiotically from mixing seawater fluids. We observed local brucite precipitation microbial filaments and, some cases, may affect growth direction crystals. fluorescent carbonate minerals, possibly indicating organic compounds. Our results point an important substrate for life alkaline systems.

Language: Английский

Citations

4
Pyrite trace element proxies for magmatic volatile influx in submarine subduction-related hydrothermal systems DOI Creative Commons
Jan J. Falkenberg, Manuel Keith, Karsten M. Haase

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2024, Volume and Issue: 373, P. 52 - 67

Published: March 30, 2024

Seafloor massive sulfides are modern analogues to ancient volcanogenic sulfide deposits, which particularly enriched in volatile and precious metals (e.g., Te, Au, Ag, Cu, Bi, Se) subduction-related settings. However, the sources of still poorly constrained, it remains elusive, whether magmatic influx controls their distribution submarine hydrothermal systems on plate tectonic-scale. Here, we demonstrate, for first time, that As, Sb contents as well related Te/As Te/Sb ratios vary systematically with δ34S composition pyrite native S, reported by high-resolution coupled SIMS trace element LA-ICP-MS micro-analysis. The better correlation (Te/As, Te/Sb) opposed Te) demonstrates provide a more robust record than absolute contents. On this basis, define quantitative threshold high (>0.004) (>0.6) indicative systems. Two-component fluid mixing simulations further revealed <5 % drastically changes (and ratio modelled fluid, but only slightly its composition. This suggests sensitive into seawater-dominated signatures if was low. Beyond this, our results demonstrate magma-derived seawater has negligible effect Te/Sb, while S isotope system is prone overprinting leading commonly ambiguous source signatures. Thus, systematics proxy evaluate contribution volatiles from grain-

Language: Английский

Citations

4
Microbial community differentiation in vent chimneys of the Lost City Hydrothermal Field reflects habitat heterogeneity DOI Creative Commons

Osama M. Alian,

William J. Brazelton, Karmina A. Aquino

et al.

Frontiers in Microbiomes, Journal Year: 2025, Volume and Issue: 3

Published: Jan. 20, 2025

Oceanic hydrothermal vent systems represent some of the oldest habitats on Earth and serve as analogs for extraterrestrial environments. The Lost City Hydrothermal Field (LCHF) near Mid-Atlantic Ridge is one such environment, its large chimneys are unique in hosting actively venting fluids that primarily controlled by serpentinization reactions subseafloor. Microbial communities within LCHF have been studied insights into their functional adaptations to warm, alkaline, dissolved inorganic carbon-limited environment. Metagenomic mineralogical data collected during a recent expedition were analyzed delineate associations between microbial populations physical, chemical biological characteristics chimneys. Bacterial 16S rRNA gene sequences show high degree putative microdiversity relatively dominant genera Desulfotomaculum, Sulfurovum, Thiomicrorhabdus, Serpentinicella, which core overall bacterial community. This relates compositional fraction aragonite, brucite, calcite minerals chimney samples rather than just composition nearby fluids. Although many species found both fluids, community structures biofilms remain distinct from flow through them. Shotgun metagenomic analyses reveal differences among genes predicted be involved carbon, methane, nitrogen sulfur cycling with respect correlations abundances specific minerals. These hint at microenvironmental complexity lost standard bulk analyses. findings this study underscore need more closely examine microbe-mineral interactions natural environments, critically informing not population-level distributions, but also underpinnings these extremophile communities.

Language: Английский

Citations

0
Comparative analysis of esophageal gland microbes between two body sizes of Gigantopelta aegis , a hydrothermal snail from the Southwest Indian Ridge DOI Creative Commons

Anning Mou,

Xinglong Li, Li Zhong

et al.

Microbiology Spectrum, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

ABSTRACT Microbial communities within animals provide nutritional foundation and energy supply for the hydrothermal ecosystem. The peltospirid snail Gigantopelta aegis forms large aggregation in Longqi vent field on Southwest Indian Ridge. This endemic species is characterized by a changeable diet morphology, especially reflected internal organs such as remarkably enlarged esophageal glands. Here, 16S full-length rRNA gene analysis was performed to compare variations gland microbiota between two body size groups (small large) of G. . Phyla Proteobacteria Bacteroidetes were dominant featured bacteria contributing microbial community. No significant differences small revealed diversity index principal component (PCA) clustering. relative abundance bacteria. Compared with small-sized snails, larger ones housed more Thiogranum (9.94% 34.86%) fewer Sediminibacterium (29.38% 4.54%). Functional prediction all showed that pathways related metabolism appeared highly abundant smaller However, ones, most distinctive those environmental information processing. Facultative symbiotic Sulfurovum marked core node co-occurrence network suggested an influence habitat selection fields. In summary, composition potential functions possibly changes anatomical structure dietary habits These shared capabilities supplementation ecological niche expansion host, potentially key adaptation survival. IMPORTANCE Dominant Ridge, observed undergo unique morphological shifts known cryptometamorphosis. During this process, developed specialized bacteria-housing organ, gland, later life stages. Our research discovered microbes different snails. closely development health Full-length , suggesting association adaptation. group, enriched metabolism, while individuals, predictions indicated adaptive Also, could be one factors influencing Understanding complex relationship benthic macrofauna helps us describe mechanisms survival extreme environments.

Language: Английский

Citations

0
The global high-temperature on-axis hydrothermal fluid and element flux to the modern ocean DOI
Alexander Diehl, Wolfgang Bach

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: April 2, 2025

Abstract Seafloor hydrothermal venting is one of the major processes that regulate composition ocean. With a fluid flux orders magnitudes lower than circulation mildly-tempered fluids in ridge-flanks, or riverine runoff, high temperature at oceanic plate boundaries can supply element fluxes exceed ones (c)old lithosphere river waters. Despite our knowledge on diversity vent compositions, estimates on-axis and were carried out with basalt‑hosted mid‑ocean ridge black-smoker-type imposed to be responsible for global cooling axes. In this study, we consider current estimate fluxes. Our investigation suggests fluid- corresponding element-fluxes grossly underestimated, due ignorance volcanic arcs omission different substrate types associated boundaries.

Language: Английский

Citations

0
Processes and Perspectives in Extensional Tectonics DOI
Elizabeth J. Catlos, İbrahim Çemen

Geophysical monograph, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 20

Published: April 11, 2025

Language: Английский

Citations

0