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#geochemistry

1 post1 participant0 posts today
Public
💧🌏 Greg Cocks

Critical Minerals In Ores (CMiO) Database
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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

Public
💧🌏 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

Public *
💧🌏 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)
Public
Dr Micha Campbell

This fortnight's paper club offering is this banger by Tremaine and Frohlich (2013). Picked by me, as my group is moving towards doing more TE work, so I'm trying to share the foundational TE papers. It's been a minute since I've read this paper closely, and it's still thoroughly enjoyable (if you're interested in the interactions between host rock chemistry, hydrology, climate, and trace element concentrations, but aren't we all!).

#PaperClub #geochemistry

sciencedirect.com/science/arti

Public
Nina Davtian

Are past #ocean #temperature #reconstructions based on #geochemical indicators representative at the #local and #regional scales, as such reconstructions typically rely on a single #sediment core?
This new #scientific #publication—not co-authored by me—addresses this #question:
doi.org/10.1186/s40645-024-006
#Science
#ScienceMastodon #AcademicMastodon
#PaleoClimate #SeaTemperature #SeaSurfaceTemperature #SST
#Geochemistry #Foraminifera #MgCa #Biomarkers #Alkenones #GDGTs #isoGDGTs

SpringerOpenReplicability of paleotemperature records in the northern Okinawa Trough and its implications for paleoceanographic reconstructions - Progress in Earth and Planetary ScienceGeochemical proxies are frequently utilized in the reconstruction of past ocean temperatures. Due to resource constraints, these reconstructions typically rely on a single sediment core, raising questions about the local and regional representativeness of paleotemperature records. To address this, we analyzed four sediment cores located within a 10-km radius in the northern Okinawa Trough (OT), which share the same climatic forcing and thus should reflect similar climate variations. We compiled published data and generated new paleotemperature estimates based on three widely used geochemical proxies (foraminiferal Mg/Ca, $${\text{U}}_{37}^{{{\text{K}}^{\prime}}}$$ U 37 K ′ , $${\text{TEX}}_{86}$$ TEX 86 ). Analysis of the mean absolute deviations for nearby records based on the same proxy revealed that $${\text{U}}_{37}^{{{\text{K}}^{\prime}}}$$ U 37 K ′ has the highest reproducibility, followed by Mg/Ca and $${\text{TEX}}_{86}$$ TEX 86 . However, inconsistencies in inter-proxy offsets among nearby sites suggest the presence of noise in the proxy records, likely stemming from instrumental errors and sediment heterogeneity. Furthermore, the Mg/Ca and $${\text{U}}_{37}^{{{\text{K}}^{\prime}}}$$ U 37 K ′ paleotemperature records agree within uncertainty when accounting for inter-site variability and calibration uncertainties, challenging previous interpretations of temperature signals from different seasons. All proxies indicate similar glacial-interglacial trends, albeit with varying magnitudes of temperature change. Both Mg/Ca and $${\text{U}}_{37}^{{{\text{K}}^{\prime}}}$$ U 37 K ′ records suggest a glacial cooling of ~ 3 °C, whereas $${\text{TEX}}_{86}$$ TEX 86 sea surface temperature (SST) data indicate a stronger glacial cooling of approximately ~ 6–8 °C. Modern observations indicate a subsurface $${\text{TEX}}_{86}$$ TEX 86 recording depth of 50–100 m, coinciding with the thermocline. However, the $${\text{TEX}}_{86}$$ TEX 86 subsurface temperature (subT) record does not resemble the Mg/Ca records of thermocline-dwelling foraminifera species. Instead, there is a better agreement with benthic foraminiferal Mg/Ca records of Uvigerina spp. (~ 700 m) and the intermediate temperature record derived from radiolarian assemblages (~ 500 m), pointing to a $${\text{TEX}}_{86}$$ TEX 86 recording depth that is deeper than the thermocline. In summary, our findings show that proxy noise can impact inter-proxy comparisons of paleotemperature records, but not the direction of glacial-interglacial shifts. Future research should prioritize constraining the recording depth of paleotemperature proxies and reducing calibration uncertainty for more precise and reliable quantitative paleotemperature reconstruction.
Public
Morgan

Wrapping up last minute prep for #SGTSG2024 - including rebuilding the JupyterHub server on provider number four thanks to recurrrent issues and limitations.
Writing it off as 'L&D for deploying cloud VMs'. 😩

For those not at the conference or visiting from the future, you can find the material to peruse at your leisure on GitHub github.com/morganjwilliams/202 #pyrolite #Python #geochemistry

GitHubGitHub - morganjwilliams/202411-sgtsg-pyrolite-workshop: pyrolite workshop for the the 2024 SGTSG conference in Armidale, NSWpyrolite workshop for the the 2024 SGTSG conference in Armidale, NSW - morganjwilliams/202411-sgtsg-pyrolite-workshop
Public
💧🌏 Greg Cocks

[Canadian Camper Planning A Trip] Saw A Suspicious Pit On Google Maps; Experts Say It Could Be A Crater From An Ancient [Meteorite Impact]
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cbc.ca/news/canada/montreal/qu <-- shared media article
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impactearth.com/ <-- shared link to Impact Earth, an interactive map of impact craters and deposits
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doi.org/10.1016/j.earscirev.20 <-- shared paper on ImpactEarth
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#GIS #spatial #mapping #Canada #Quebec #CôteNord #GoogleMaps #crowsourced #citizenscience #meteorite #impactcrater #topography #geomorphology #geomorphometry #sampling #zircon #mineralogy #geology #asteroid #geochemistry

screen short - Impact Earth web map
photo - A large shatter cone, a hallmark of meteorite impact, in tilted strata of Ordovician limestone, Charlevoix impact structure, Québec
Google Maps image - The potential meterorite impact crater is located about 100 kilometres north of Magpie, Que., and is about 15 kilometres in diameter
photo - microscope - zircon from meteorite impact
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