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**Mainz University** @mainzuniversity@wisskomm.social · 1d

Mainz University @mainzuniversity@wisskomm.social

The green past of the Saharo-Arabian Desert: Isotope analyses of limestone cave deposits reveal recurrent humid intervals in the #SaharoArabianDesert over the last eight million years / International research project led by the Max Planck Institute for Chemistry with participation of #MainzUniversity and Goethe University Frankfurt, supported by the Saudi Heritage Commission and the Ministry of Culture https://press.uni-mainz.de/the-green-past-of-the-saharo-arabian-desert/

Speleothems, or dripstones, are excellent climate archives because the chemical composition of the calcium carbonate in speleothems changes with the climatic conditions above the cave. (photo/©: Hubert Vonhof)

#paleoclimate #hydroclimate #geochemistry

**Greg Cocks** @GregCocks@techhub.social · Apr 2

Apr 2

Greg Cocks @GregCocks@techhub.social

Critical Minerals In Ores (CMiO) Database
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https://lnkd.in/gynRjUfn <-- shared USGS publication
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https://lnkd.in/gETca3DQ <-- shared link to open data database, web map services, etc
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https://portal.ga.gov.au/persona/cmmi <-- shared web map
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https://lnkd.in/gdmMp2zg <-- shared editorial piece on critical minerals and geopolitics
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#geology #fedscience #opendata #CMMI #CMiO #criticalminerals #minerals #ores #database #opendata #GIS #spatial #mapping #spatialanalysis #commodities #technology #components #geochemistry #deposits #mining #extraction #classifaction #nomenclature #environments #structuralgeology #exploration
@USGS | @GeoscienceAustralia | @GeologicalSurveyOfCanada

**Greg Cocks** @GregCocks@techhub.social · Mar 19

Mar 19

Greg Cocks @GregCocks@techhub.social

The GEOROC Database (Geochemistry of Rocks of the Oceans and Continents)
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https://georoc.eu/georoc/new-start.asp <-- shared link to GEOROC resource
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H/T Paul Cleverley glasses curly blonde hair
“The GEOROC Database (Geochemistry of Rocks of the Oceans and Continents) is a comprehensive collection of published analyses of igneous and metamorphic rocks and minerals. It contains major and trace element concentrations, radiogenic and nonradiogenic isotope ratios as well as analytical ages for whole rocks, glasses, minerals and inclusions. Metadata include geospatial and other sample information, analytical details and references….
Current content of GEOROC:
• 22,750 papers
• 685,660 samples
• 2,680,100 analyses
• 39,334,100 single data values…”
#opendata #geology #geoscience #GEOROC #database #global #igneous #metamorphic #rocks #minerals #geochemistry #results #analyses #published #metadata #spatial #GIS #mapping #papers #samples #datavalues

**Academic Europe** @AcademicEurope@mstdn.business · Mar 19

Mar 19

Academic Europe @AcademicEurope@mstdn.business

Job - Alert

PHD POSITION (F_M_X) – INVESTIGATIONS INTO THE INDUSTRIAL APPLICATION OF GAS HYDRATES

Deadline: 2025-04-17
Location: Germany, Potsdam, Brandenburg

https://www.academiceurope.com/job/?id=7213

#hiring #GFZ #PhD

**D-USYS ETH Zurich** @usyseth@mastodon.social · Mar 18

Mar 18

D-USYS ETH Zurich @usyseth@mastodon.social

Lenny Winkel, our associate Professor of Inorganic Environmental Geochemistry, studies the environmental behavior of trace elements like #selenium. Grown up in the Netherlands, she loves the Swiss mountains! #EnvironmentalScience #Selenium #Geochemistry

https://ethz.ch/en/news-and-events/eth-news/news/2025/03/the-amount-of-selenium-in-the-environment-also-has-an-impact-on-health.html

ETH ZurichThe amount of selenium in the environment also has an impact on healthLenny Winkel researches the environmental behaviour of trace elements such as selenium. A native of the Netherlands, she adores the Swiss mountains.

**Bill Minarik** @silicatefondue · Mar 16 *

Mar 16 *

Bill Minarik @silicatefondue

Jonathan O'Neil of the University of Ottawa telling the story of the Hadean mantle and crust from the few scraps of rocks left to us from that time. Short- and long-lived isotopic systems constrain the timing and processes of the Earth's first crust. The second keynote at the Geotop annual meeting, hosted at ÉTS.

Jonathan O'Neil of the Univ. Ottawa introducing the ancestry of Earth's crust.

A slide illustrating the radioactive decay of isotopes present at the Earth's formation.

#UOttawa #ETS_Montreal #Geotop

**Planetary Ecologist** @planetaryecologist@mastodon.social · Mar 15

Mar 15

Planetary Ecologist @planetaryecologist@mastodon.social

Geochemistry (Earth sciences )

Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth's crust and its oceans.: 1 The realm of geochemistry extends beyond the Earth, encompassing the entire Solar System, and has made important contributions to the understanding of a number of processes including mantle convection, the forma...

https://en.wikipedia.org/wiki/Geochemistry

en.wikipedia.orgGeochemistry - Wikipedia

#Geochemistry #EarthSciences

**Natural Gas Industry B updates** @ngibjournal@mastodon.social · Mar 10

Mar 10

Natural Gas Industry B updates @ngibjournal@mastodon.social

Welcome to read latest special issue from NGIB! All articles are open access at https://www.sciencedirect.com/special-issue/10B5Z4RL3D9
#NGIB #naturalgas #geochemistry #offshore

**Matthew Collins** @matthewcollins.bsky.social@bsky.brid.gy · Feb 17

Feb 17

Matthew Collins @matthewcollins.bsky.social@bsky.brid.gy

Cave environments affect bone at the Galería site (Spain) over 300ka. Lowest levels <3% survival - heavy rainfall acid soils leach away bone. As climate dries, preservation improves ML 89% classification Link: www.nature.com/articles/s41... #archaeology #taphonomy #geochemistry

A four-panel (A-D) conceptual model showing the evolution of bone preservation conditions in the Galería cave site across different Marine Isotope Stages (MIS). Each panel includes a cross-section of cave deposits and chemical pathways.
Panel A (GIIa, MIS10a): Shows waterlogged, acidic conditions (660-620mm/year rainfall) with extensive bone leaching and formation of phosphate minerals.
Panel B (GIIb, MIS9d): Depicts drier conditions (600mm/year) with partial bone leaching and CaCO3 migration.
Panel C (GIIIa, MIS9c): Illustrates a transition from wet to dry (560-530mm/year) with increasing alkalinity and calcite precipitation.
Panel D (GIIIb-GIV, MIS8-MIS7e): Shows cold, arid conditions (520-420mm/year) with intense calcite precipitation and fluorine incorporation in bones.
Each panel includes chemical reaction pathways shown with blue arrows, and red arrows indicate key depositional processes. The diagrams show how environmental changes affected bone preservation through time.

**Uni Göttingen** @unigoettingen@academiccloud.social · Jan 24

Jan 24

Uni Göttingen @unigoettingen@academiccloud.social

What is the Moon made of? And how did it get here?

Researchers from our Uni & @mpsgoettingen analysed samples from the Moon. Their results suggest that the Moon could in fact be a chunk ejected from the Earth’s mantel following a massive collision: https://s.gwdg.de/woj1iB

Research #PNAS: https://doi.org/n22f
#Geochemistry #Isotopes #Geology #Geosciences

Image shows glass cabinets holding samples of rock from the moon. The cabinet shows that the samples are securely looked after and protected - it has a secure air and locking system and the samples can be handled through what looks like "portholes". The room behind is full of similar cabinets. The rocks themselves are dark grey some straight with cut surfaces and some with holes. Since the Apollo era, the lunar samples have been stored at NASA's Johnson Space Centre in Houston and are available for research. All lunar samples analysed in the laboratory in Göttingen were provided by NASA. Photo by Andreas Pack

**Greg Cocks** @GregCocks@techhub.social · Jan 22 *

Jan 22 *

Greg Cocks @GregCocks@techhub.social

Edge Of Mars’ Great Dichotomy Eroded Back By Hundreds Of Kilometres
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https://arstechnica.com/science/2025/01/field-of-mounds-on-mars-may-be-sign-of-erosion-at-the-edge-of-an-ocean/ <-- shared technical article
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http://dx.doi.org/10.1038/s41561-024-01634-8 <-- shared paper
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#GIS #spatial #mapping #planet #Mars #remotesensing #imagery #landsurface #geology #topography #astrogeology #elevation #morphology #martian #geography #marsdichotomy #plateau #lowlands #model #3dmodel #basin #highlands #shoreline #ocean #crust #structuralgeology #chemostratigraphy #morphostratigraphy #geomorphometry #geomorphology #water #hydrology #CaSSIS #HiRISE #stratigraphy #strata #MOLA #laser #LiDAR #MawrthVallis #crater #mound #profile #crosssection #geochemistry #mineralogy #CRISM #CTX #HRSC #DTM #erosion #weathering #spatialanalysis #spatiotemporal

images - Morphological similarities between the stratigraphy in the mounds and the Mawrth Vallis plateau region

3D model, map, images and charts - Chemostratigraphy and morphostratigraphy of a well-exposed mound

3D map and cross section - Three-dimensional view of study area with stacked elevation profiles

image/map - the topography of Mars by the Mars Orbital Laser Altimeter (MOLA)

**Academic Europe** @AcademicEurope@mstdn.business · Jan 16

Jan 16

Academic Europe @AcademicEurope@mstdn.business

Job - Alert

PHD POSITION (F_M_X) IN WETLAND SOIL MICROBIAL ECOLOGY

Deadline: 2025-02-16
Location: Germany, Potsdam, Brandenburg

Apply now: https://www.academiceurope.com/job/?id=6519

#hiring #PhD #biogeochemistry

**Or M. Bialik** @ombialik@mastodon.world · Jan 9

Jan 9

Or M. Bialik @ombialik@mastodon.world

Looking for a #postdoc for 2026? Interested in the interfaces between #sedimentology and #geochemistry? #Biology and the #seafloor? #ClimateChange at #sea? Come join my new group!
I'm looking for candidates to apply with us for Marie Sklodowska Curie fellowships on a range of topics.

Looking for your next postdoc? Come apply with us for a Marie Sklodowska Curie fellowship. Our work ranges from marine chemistry, environmental reconstruction, climate change in the marine environment, diagenesis, sediment-water interactions and more.
We are looking for excellent candidates — geologists, sedimentologist, geochemists, modellers, computational geoscientists and others in the earth and marine sciences space — interested in working on (but not limited to) the following research themes:
- Sediment-water interactions.
- Low temperature carbonate mineral reactions/interactions.
- Seafloor fluxes.
- Role of waves and storms in sediment distribution.
- Abiotic control factors on benthic communities.
- Long term fidelity of environmental signals.
An ideal candidate should be interested in working in a highly multi-disciplinary environment, eager to share their knowledge and learn.

Are you interested?
Please send a synopsis of the project you wish to work on, and a copy of your CV (including list of publications), to obialik@ocean.org.il by June 30th 2025 the latest. The deadline for proposal submission is mid-September 2025.

**Greg Cocks** @GregCocks@techhub.social · Jan 8

Jan 8

Greg Cocks @GregCocks@techhub.social

‘Mystery Volcano’ That Erupted And Cooled Earth In 1831 Has Finally Been Identified
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https://www.accuweather.com/en/weather-news/mystery-volcano-that-erupted-and-cooled-earth-in-1831-has-finally-been-identified/1729581 <--shared technical article
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https://doi.org/10.1073/pnas.2416699122 <--shared paper
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#GIS #spatial #mapping #glaciochemical #geochemistry #climate #climatechange #sulfurdioxide #neversummer #temperature #weather #icecore #LittleIceAge #dating #model #modeling #spatialanalysis #historic #volcanic #eruption #stratigraphy #Zavaritskii #caldera #ash #KurilIslands #Japan #Kamchatka #Russia #volcano #stratospheric #cryptotephra #tephra #andesite #dacite #Simushir #SimushirIsland

oblique view - volcanic caldera, aerial image, Simushir Island, Kuril Islands, Pacific Ocean

maps and cross section - Location map of Zavaritskii caldera, Simushir Island, Kurils.

maps and charts - Glaciochemical records from Greenland ice-cores (NEEM-2011-S1 (A), NGRIP1 (B), B19 (C), and Tunu2013 (D)). Sulfur (S) and non-sea-salt sulfur (nssS) are shown on the left-hand axis (blue line; in ng/g).

aerial view - volcanic caldera, aerial image, Simushir Island, Kuril Islands, Pacific Ocean

**Planetary Ecologist** @planetaryecologist@mastodon.social · Jan 7

Jan 7

Planetary Ecologist @planetaryecologist@mastodon.social

Normative mineralogy (Mineralogy )

Normative mineralogy is a calculation of the composition of a rock sample that estimates the idealised mineralogy of a rock based on a quantitative chemical analysis according to the principles of geochemistry. Normative mineral calculations can be achieved via either the CIPW Norm or the Barth-Niggli Norm. Normative calculations are used t...

https://en.wikipedia.org/wiki/Normative_mineralogy

en.wikipedia.orgNormative mineralogy - Wikipedia

#NormativeMineralogy #Mineralogy #Geochemistry

**Greg Cocks** @GregCocks@techhub.social · Jan 2 *

Jan 2 *

Greg Cocks @GregCocks@techhub.social

Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
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https://doi.org/10.1073/pnas.2404731121 <-- shared paper
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#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics

AI image - miner holding a large gold nugget in his hand

cross sections and charts - Mineral assemblages and dominant sulfur species in the devolatilization fluid for an average AOC along the hot (central Cascadia) and cold (central Honshu) subduction pressure–temperature (P-T) paths.

cross sections and charts - Mantle wedge oxidation models showing the oxidation capacity of slab devolatilization fluids.

cross sections - Proposed scenarios for progressive devolatilization and redox processes at slab–mantle interface.

**The Inquisitive Biologist** @inqbiol@scicomm.xyz · Dec 31, 2024

Dec 31, 2024

The Inquisitive Biologist @inqbiol@scicomm.xyz

The Inquisitive Biologist looks back at 2024 and picks his five favourite books. Palaeoart, taxonomy, zoogeochemistry, death, and animal communication make this year's list.

https://inquisitivebiologist.com/2024/12/31/year-list-the-inquisitive-biologists-top-5-reads-of-2024/

@Susana_MonsO @princetonupress @princetonnature @arik_kershenbaum #Books #BookOfTheYear #BookReview #Bookstodon #Scicomm #Paleontology #Palaeontology #WildlifeArt #Taxonomy #Biography #HistoryOfScience #ScienceHistory #HistSci #Ecology #Geochemistry #Ethology #Death #Bioacoustics @bookstodon