#authigenic
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sciencex.bsky.social
Exceptional preservation of Ediacara Biota fossils in sandstone is linked to unique sea floor chemistry, where authigenic clays cemented sand grains and captured detailed impressions of soft-bodied organisms.
How did these strange, ancient organisms turn into such remarkable fossils?
In Earth's fossil record, soft-bodied organisms like jellyfish rarely stand the test of time. What's more, it's hard for any animal to get preserved with exceptional detail in sandstones, which are made of large grains, are porous, and commonly form in environments swept by rough storms and waves.
phys.org
January 8, 2026 at 6:35 PM
nz-nb.bsky.social
Authigenic Biosignatures Of Microbial Biomass Preserved As Carbonate Ooids Formed By Abiotic Chemically Oscillating Reactions Throughout Earth History

https://www.newsbeep.com/nz/214644/

Selected examples of different chemically oscillating reactions (COR) with patterns produced during the …
Authigenic Biosignatures Of Microbial Biomass Preserved As Carbonate Ooids Formed By Abiotic Chemically Oscillating Reactions Throughout Earth History - New Zealand News Beep
Ooids are small spheroidal carbonate grains that have circularly concentric and radially aligned crystals. Oolitic carbonates are commonly associated with
www.newsbeep.com
January 3, 2026 at 10:30 AM
astrobiology.bsky.social
Authigenic Biosignatures Of microbial Biomass Preserved As Carbonate Ooids Formed By Abiotic Chemically Oscillating Reactions Throughout Earth History
astrobiology.com/2026/01/auth... #astrobiology #originoflife #biosignatures
Authigenic Biosignatures Of Microbial Biomass Preserved As Carbonate Ooids Formed By Abiotic Chemically Oscillating Reactions Throughout Earth History - Astrobiology
Ooids are small spheroidal carbonate grains that have circularly concentric and radially aligned crystals.
astrobiology.com
January 2, 2026 at 4:49 PM
tracers-in-the-sea.bsky.social
🌊🧪 So-called authigenic minerals in sediments are formed by spontaneous crystallization within the sediment or water column. They make up only a small fraction of the total sediment. The most important of these is the iron-manganese oxide material in sediments formed through the reduction of
December 30, 2025 at 9:26 AM
eth-eaps.bsky.social
The Earth Surface Geochemistry group at ETH Zurich is looking for a doctoral student to study the formation of authigenic clay minerals in the laboratory and natural environment and explore their impact on the global cycle of silicon and its isotopes. #applynow #phd #jobalert
Doctoral position in isotope geochemistry for marine authigenic clay formation and the silicon cycle
Marine authigenic clay formation, sometimes called "reverse weathering," is being increasingly recognised as an important facet of the series of Earth surface processes that interact to regulate…
www.jobs.ethz.ch
December 19, 2025 at 10:32 AM
tracers-in-the-sea.bsky.social
🌊🧪 So-called authigenic minerals in sediments are formed by spontaneous crystallization within the sediment or water column. They make up only a small fraction of the total sediment. The most important of these is the iron-manganese oxide material in sediments formed through the reduction of
November 28, 2025 at 6:57 AM
ianhall.bsky.social
🌊 ‘Reverse weathering’, authigenic clay formation in marine sediments, may be far faster than thought

Fe(II)-bearing smectite and mica formed in just 40 days from diatom silica, showing rapid feedbacks on ocean chemistry

www.science.org/doi/10.1126/...
Rapid transformation of biogenic silica to authigenic clay: Mechanisms and geochemical constraints
Biogenic silica transforms to authigenic clay within 40 days, which is more responsive reverse weathering than previously assumed.
www.science.org
November 12, 2025 at 5:54 AM
jfarmersalmanac.bsky.social
In the Materials and methods, we evaluate the primary age concerns for the Arctic (hiatuses, authigenic calcite) and rule out both. Foram-bound N isotopes are an exceedingly important tool for clarifying the age of Arctic sediments, and thereby allowing the application of tools like 230Th_xs (7/n)
November 7, 2025 at 1:24 AM
obialik.bsky.social
The fate of silicon in the ocean is something we surprisingly still trying to wrap our heads around. Part of it is integrated into the shells of marine organisms (e.g., diatoms), but when they die, some dissolves back, and some apparently turn into clay. 🧪🌊

Link: www.science.org/doi/full/10....
Representative SEM images and EDX elemental maps of reacted bSi after 40 days. (A) 0Fe(II) + bSi, (B)1000Fe(II) + bSi, (C)1000Fe(II) + bSi + Al, and the morphology and EDX spectra of neoformed phases in 1000Fe(II) + bSi + Al (D) and 1000Fe(II) + bSi + FeAl (E) treatments. No changes in morphology were observed in 0 μM Fe(II) treatment (A), whereas bSi were extensively altered and elemental association of Fe, Si, and O were observed in [(B) and (C)]. Flake-shaped rosette clusters of authigenic phases were observed in [(D) and (E)], with both phase rich in Fe, Si, Al, and Mg with small amounts of Ca. Dashed areas in [(D) and (E)] show zoomed view with EDX spectra taken at the cross point.
November 2, 2025 at 2:59 PM
ldelaigue.bsky.social
By accounting for organic heterogeneity, we can now better predict when and where authigenic iron hydroxides form — a key process driving oceanic iron removal 🌊⚙️
October 31, 2025 at 12:05 PM
ordofibonacci.bsky.social
Rapid transformation of biogenic silica to authigenic clay: Mechanisms and geochemical constraints
Science Advances
www.science.org/doi/10.1126/...
Rapid transformation of biogenic silica to authigenic clay: Mechanisms and geochemical constraints
Biogenic silica transforms to authigenic clay within 40 days, which is more responsive reverse weathering than previously assumed.
www.science.org
October 31, 2025 at 6:33 AM
scienmag.bsky.social
Lithium Isotopes Reveal Carbonate Formation in Marine Sediments

Recent research has unveiled a remarkable connection between lithium isotopes and the intricate processes of silicate weathering that lead to the formation of authigenic carbonates in marine sediments. This groundbreaking study…
Lithium Isotopes Reveal Carbonate Formation in Marine Sediments
Recent research has unveiled a remarkable connection between lithium isotopes and the intricate processes of silicate weathering that lead to the formation of authigenic carbonates in marine sediments. This groundbreaking study conducted by Huang, Gong, Peckmann, and their colleagues, published in Communications Earth & Environment, pushes the boundaries of our understanding of biogeochemical cycles in marine environments, shedding light on how these elements interact within sedimentary contexts.
scienmag.com
October 3, 2025 at 10:57 AM
tangri0.bsky.social
This is the split between intellectual historians and materialists, right? Do ideologies only serve as handmaidens to material forces already in play or do they have an authigenic force of their own? If racism was downstream of slavery, was anti racism really downstream of abolition?
September 12, 2025 at 10:12 PM
rickhunter.bsky.social
“…we consider here an alternative biological pathway for the formation of authigenic nodules and reaction fronts. On Earth, vivianite nodules are known to form in fresh water and marine settings as a by-product of low-temperature microbially mediated Fe-reduction reactions.”
coreyspowell.bsky.social Corey S. Powell @coreyspowell.bsky.social · Sep 10
The full Nature paper about the Mars biosignature ("Redox-driven mineral and organic associations in Jezero Crater, Mars") is openly available:

www.nature.com/articles/s41...
🧪🔭
NASA’s Perseverance Mars rover captured this image last year of a rock nicknamed Cheyava Falls. Irregular, millimeter-size “leopard spots” in the band of reddish soil caught the attention of scientists. Credit: NASA
September 10, 2025 at 5:39 PM
pmarques35.bsky.social
[8/8] L’étude conclut que le système Kunlun est un laboratoire naturel unique : il éclaire les débuts de la subduction, le potentiel énergétique de l’hydrogène marin et l’histoire de la vie. Il renouvelle notre regard sur la dynamique des océans profonds. #geography #oceanography
The development model of the Kunlun pipe swarm and on-site observations. On the basis of the observations in this study, the Kunlun pipe swarm hydrothermal system experienced four stages. (A) Stage 1: Major explosion. A hydrogen explosion formed the large pipes due to serpentinization. (B) Widely distributed breccias in the Laoshan pipe, indicating explosions during stage 1. (C) Stage 2: Intense eruption. Authigenic dolomite (Fig. 2B) suggests that the temperature of the hydrothermal fluids was likely in the range of 40° to 80°C, which changed to calcite at lower temperatures. (D) Strong hydrothermal eruptions are indicated by dense hydrothermal tubes in the Laoshan pipe, suggesting strong hydrothermal activity during stage 2. (E) Stage 3: Diffusive eruption. The fluid channel becomes smaller and smaller because of authigenic carbonates and may even be sealed. Consequently, the accumulation of hydrogen caused smaller explosions, which was then followed by diffusive hydrothermal flows. (F) A hydrothermal pit with a diameter of 5 m, showing diffusive hydrothermal flows at the bottom. Two scorpionfish are found near a hydrothermal vent. This kind of hydrothermal pipes/pits of 1 to 20 m in diameter appears in groups in all the four pipes prospected in this study. (G) Stage 4: Extinction phase. Hydrothermal pipes/pits are covered by sediments. No flow is observed because of ceased serpentinization underneath. (H) An example of extinct pits in the Zhushan pipe, which is also observed in other pipes. CREDIT: [(B), (D), and (F)] L. LI/LAOSHAN LABORATORY and (H) W. SUN/INSTITUTE OF OCEANOLOGY, CHINESE ACADEMY OF SCIENCES.
September 7, 2025 at 5:24 AM
pmarques35.bsky.social
[7/8] Les auteurs estiment que le flux d’hydrogène du Kunlun pourrait représenter jusqu’à 48% de celui lié à la serpentinisation globale. Cette source insoupçonnée ouvre de nouvelles perspectives pour comprendre les cycles géochimiques et pour explorer des réservoirs d’hydrogène. #geography
Cartoon illustrating the mechanism of hydrothermal activities inside a large pipe. Seawater sinks into the lithosphere through deep faults on the bending parts of the subducting Caroline Plate to the west of the Mussau Trench, where it reacts with hot rocks, forming serpentinite and hydrogen. The alkaline fluids, rich in hydrogen, magnesium, and iron, generated by serpentinization, ascend along fractures and continuously dissolve calcium from the surrounding rocks, leading to calcium enrichment in the hydrothermal fluids. After ascending, these fluids mix with the shallow circulation of seawater and are released at the seafloor in the form of hydrothermal discharge. Near the vent, under high temperatures, calcium and magnesium ions in the hydrothermal fluids combine with carbon dioxide from seawater to form dolomite. At greater distances from the vent, due to cooling from seawater, authigenic carbonate rocks primarily composed of calcite are formed under normal seabed temperature conditions. These hydrogen-rich hydrothermal fluids accumulate hydrogen within the pipe after being released at the pipe bottom, fostering a chemolithoautotrophic ecosystem.
September 7, 2025 at 5:24 AM
moodogpress.com
“The Mazon Creek fossils are acclaimed worldwide for the detailed preservation of even soft-bodied organisms that rarely show up in the fossil record, including jellyfish, worms, centipedes, and a famous mystery fossil affectionately called the Tully Monster.”

#FossilFriday
Mazon Creek Fossil Beds Carboniferous River Bed - 300 million years ago, Grundy County in Illinois was the location where a large tropical river flowed into a delta region close to the sea, resulting in fossil assemblages with remarkable diversity. This diversity reflects a variety of habits: terrestrial, freshwater, brackish and restricted marine: over 400 species have been reported. The Mazon Creek fossils are acclaimed worldwide for the detailed preservation of even soft-bodied organisms that rarely show up in the fossil record, including jellyfish, worms, centipedes, and a famous mystery fossil affectionately called the Tully Monster. The fossilization process in the Mazon Greek was a unique form of authigenic mineralisation. Dead organisms (animals and many parts of plants living in the coal forests) were rapidly buried in organic-rich deltaic sediments, where bacterial decomposition produces carbon dioxide, which reacts with the iron in the sediment to form siderite. The siderite closes off the soft organic materials from oxygen (thus rotting) as well as predation. We now find the fossils enclosed in siderites nodules, which must be split open to reveal these beautifully preserved remains. In many nodules we see nearly three-dimensionally preserved organisms, which become more flattened towards the edge of the nodules. From Joe Webb Peoples Museum tour, from an open house. Image by Chris Brunson.
August 29, 2025 at 1:01 PM
geologyjohnson.bsky.social
I see similar trends in my proterozoic material. The coarser "detrital" kaolinite on the low TOC shelf is relatively permeable. But the "authigenic" kaolinite in the high TOC basinal regions is very fine grained, silica cemented, and super tight.
August 26, 2025 at 4:18 PM
tracers-in-the-sea.bsky.social
🌊🧪 So-called authigenic minerals in sediments are formed by spontaneous crystallization within the sediment or water column. They make up only a small fraction of the total sediment. The most important of these is the iron-manganese oxide material in sediments formed through the reduction of
August 20, 2025 at 8:30 PM
obialik.bsky.social
#WeekendReading: Li et al., on the complex relationship between monsoons, deep-sea mixing, and carbon burial in the Bay of Bengal. 🧪🌊

Link: www.sciencedirect.com/science/arti...
(a-b) Location of the core BOB-79 (red). White arrows indicate deep and bottom water in the ocean. White dotted line shows cross section of oxygen content shown in the figure (d). White and grey cycles show referenced cores and an in-situ observation station 0807, respectively. Records of these referenced cores or station are from: SO188-342KL(Contreras-Rosales et al., 2016), 117-120KL(Galy et al., 2007), MD77–176(Yu et al., 2018), E87–30(Khan et al., 2025a), SS172/4040(Bharti et al., 2022), SS152/3828(Bharti et al., 2022), I106(Wan et al., 2025), SK129-CR2(Piotrowski et al., 2009), TT1811-34GGC(Williams et al., 2021), 0807(Singh et al., 2012), RC27–23(Bryan et al., 2010). Shallow green cycle show site of a suspension sample (M03–3) from the Ganges-Brahmaputra Rivers. (c) Sea water Nd isotope profile from the station 0807 (Singh et al., 2012) which is at the depth and near the core BOB-79. Red cycle shows core top authigenic Nd isotope compositions in the core BOB-79. (c) Oxygen distribution along a N-S cross-section in the BoB, drawn with the help of ODV software (Schlitzer, 2015). UCDW: Upper Circumpolar Deep Water; LCDW: Lower Circumpolar Deep Water; NIDW: North Indian Deep Water; ICW: Indian Central Water; ITW: Indonesian Throughflow Water; ASHS: Arabian Sea High Salinity Water; EIOW: Eastern Indian Ocean Surface Water; BoBLS: BoB Lower Salinity Water.
August 1, 2025 at 1:08 PM
stableisotopeecol.bsky.social
Isotopic dynamics between methane-derived authigenic carbonates and gas hydrates: Insights from two deep-sea cold seeps #stableisotopes www.sciencedirect.com/science/arti...
Isotopic dynamics between methane-derived authigenic carbonates and gas hydrates: Insights from two deep-sea cold seeps
The use of clumped isotopes (Δ47) as a geothermometer in carbonates has become widespread in geosciences because carbonates are ubiquitous in the envi…
www.sciencedirect.com
July 4, 2025 at 1:13 PM
carbon8.bsky.social
V neat work by Jianghui Du & colleagues focusing on how ocean sedimentological processes—authigenic mineral scavenging in the water column & abyssal sediment-water interactions—are critical for ocean biogeochemical cycling of trace elements and isotopes. 🌊
June 12, 2025 at 4:14 AM
matduval64.bsky.social
An unusual study of geological apatite by Campaña et al. just published in QG: Characterizing and dating authigenic phosphates from the sedimentary infill of Atapuerca archaeo-paleoanthropological cave sites (Spain). Free download here: doi.org/10.1016/j.qu.... @cenieh.bsky.social
June 10, 2025 at 1:55 AM
sciences.skyfleet.blue
Solar‐Powered Hierarchical Microenvironments with Authigenic Multi‐Field Synergies for Simultaneous Extraction of Freshwater and Cesium
Solar‐Powered Hierarchical Microenvironments with Authigenic Multi‐Field Synergies for Simultaneous Extraction of Freshwater and Cesium
A biomass-based solar-powered hierarchical self-extraction micro-network (BSSM) is first proposed to achieve freshwater production and Cs + extraction. This study establishes a transformative paradigm for resource recovery, providing a scalable and eco-friendly panacea to address pressing global issues, including water scarcity, nuclear pollution, and resource security. Abstract The escalating global resource and environmental crisis has intensified the urgent demand for efficiently extracting freshwater and critical metals from contaminated water sources, particularly nuclear-contaminated seawater. Herein, a biomass-based solar-powered hierarchical self-extraction micro-network (BSSM) is proposed and presented, an innovative system that seamlessly integrates solar-driven freshwater generation with highly selective cesium ion (Cs + ) extraction. A bamboo-derived biochar with surface-loaded cobalt oxide nanoparticles (CoO NPs) is prepared and utilized to comprehensively validate the BSSM's efficacy. Leveraging hierarchically engineered microenvironments with authigenic multi-field synergies, the designed BSSM achieves a high freshwater production rate of 3.3 kg m −2 day −1 and an impressive Cs + extraction capacity of 34.58 mg g −1 . In conclusion, this study establishes a transformative paradigm for resource recovery, providing a scalable and eco-friendly panacea to address pressing global issues, including water scarcity, nuclear pollution, and resource security.
advanced.onlinelibrary.wiley.com
May 12, 2025 at 7:37 PM
obialik.bsky.social
Ho, authigenic clays!
(Authigenic clays are cool. Terrible pain in the ass when it comes to trying to understand elemental budgets, but nevertheless cool)
⚒️🌊
May 7, 2025 at 9:55 PM