#geochemistry

These are public posts tagged with #geochemistry. You can interact with them if you have an account anywhere in the fediverse.

Uni Göttingen

Where is over 99% of the world’s gold hidden?

It’s actually deep underground locked away in the Earth’s metallic core. However, researchers at our Uni discovered traces of precious metals in volcanic rocks on the islands of Hawaii which must have come from the Earth’s core: uni-goettingen.de/en/3240.html. Their data shows material from the core, including gold and other precious metals, is leaking into the Earth’s mantle above.

Research #nature nature.com/articles/s41586-025
#Geochemistry #IsotopeGeology

Photo thanks to United States Geological Survey (M. Patrick) showing bright orange larva from volcano against grey background. Researchers from Göttingen found tiny traces of the precious metal Ruthenium with an anomalous isotopic composition in lavas from Hawaii. The new findings prove that the Earth’s core is leaking metallic material, including gold and other precious metals.
Graphic representation of Earth’s shell structure showing the super-heated metallic inner core in the centre, followed by the solid outer core, the rocky mantle and the thin crust towards the surface. New research from the University of Göttingen demonstrates that some precious metal-rich material from the core is leaking into the Earth’s mantle above. University of Göttingen (OpenAI)
Jun 04, 2025, 08:13 · · 1 · 0
bse

Aqueous #geochemistry this semester! We've moved from simple fluid-mineral equilibria to more complex models. As a teaching tool, I developed with help of our Uni's IT folks, an online portal to #USGS model software, WEB-PHREEQ. Anyone can use this.

Of course the students download the more capable desktop version for their projects (also, yes, I know there are more advanced portals out there). #geology

ndsu.edu/webphreeq/

Welcome to Web-phreeq - aqueous geochemical modeling

PHREEQC, low temperature aqueous geochemistry, modeling,…

www.ndsu.edu
Apr 30, 2025, 18:45 · · 2 · 0
Ele Willoughby, PhD

Happy birthday to #geochemist Charles David Keeling (1928 - 2005) whose decades long observations of CO2 in air samples from Mauna Loa Observatory were some of the 1st direct data to show the human contribution to greenhouse effect & global warming. The ‘Keeling Curve’ (in copper & red) shows both the seasonal variations (the wiggles) & the strong upward trend with time as the greenhouse gas built up in the atmosphere. 🧵

#linocut #printmaking #climateChange #geochemistry #KeelingCurve #sciart

Linocut portrait of Keeling in teal with geochemical sampling tools with the Keeling curve in copy and axes (vertical: CO2 fraction micro-mol/mol from 325 to 400 and horizontal: Year 1960 to 2000).
Apr 20, 2025, 12:05 · · 13 · 0
💧🌏 Greg Cocks

Critical Minerals In Ores (CMiO) Database
--
lnkd.in/gynRjUfn <-- shared USGS publication
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lnkd.in/gETca3DQ <-- shared link to open data database, web map services, etc
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portal.ga.gov.au/persona/cmmi <-- shared web map
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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

Apr 02, 2025, 04:32 · · 0 · 0
💧🌏 Greg Cocks

The GEOROC Database (Geochemistry of Rocks of the Oceans and Continents)
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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

Mar 19, 2025, 23:00 · · 1 · 0
Bill Minarik

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.

#UOttawa #ETS_Montreal #Geotop #UQAM #Hadean #EarthsMantle #Geochemistry

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.
Mar 16, 2025, 22:06 · · · 1 · 0
Uni Göttingen

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: s.gwdg.de/woj1iB

Research #PNAS: 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
Jan 24, 2025, 13:16 · · 3 · 0
💧🌏 Greg Cocks

Edge Of Mars’ Great Dichotomy Eroded Back By Hundreds Of Kilometres
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arstechnica.com/science/2025/0 <-- shared technical article
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dx.doi.org/10.1038/s41561-024- <-- 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)
Jan 22, 2025, 00:55 · · · 1 · 0
Dr. Or M. Bialik

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.
Jan 09, 2025, 15:31 · · 3 · 0

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