EugeneNov 8

💧 Exploring how contaminated mine waters behave in a carbonate aquifer — through the lens of metasomatic zoning and thermodynamic #geochemical modeling.

Using #PHREEQC simulations, data analysis in #RStats, and geospatial visualization in #QGIS, I’m studying how mine drainage transforms groundwater systems and mineral equilibria over time.

📘 The draft version (v0.75) of my monograph on this topic has already been downloaded 550+ times on #Zenodo — showing how relevant this issue has become for both science and environmental policy.

It’s independent research that links theory, modeling, and practical hydrogeochemical assessment — focused on the long-term impact of mine waters in the Kryvyi Rih region.

🔗 Read or download:
https://zenodo.org/records/16741148

#Geochemistry #Groundwater #MineWater #EnvironmentalGeochemistry #Hydrogeology #WaterPollution #Metasomatism #OpenScience #IndependentResearch #EnvironmentalDataScience #Aquifer #HeavyMetals #Sustainability #SvystunovaGully

💧🌏 Greg CocksJun 8, 2025
Interpreting Hydrogeochemical Interactions And Controlling Processes In Groundwater Using Advanced Statistical Techniques In The Southeast Asian Megacity - Dhaka, Bangladesh
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https://doi.org/10.1016/j.clwat.2025.100084 <-- shared paper
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#GIS #spatial #mapping #spatialanalysis #spatiotemporal #Hydrogeochemistry #Groundwater #Quality #Statistics #geostatistics #Analysis #Irrigation #suitability #water #hydrology #waterresources #statistics geostatistics #waterquality #model #modeling #potable #drinkingwater #urbanisation #city #growth #population #stress #planning #management #industrial #residential #geochemical #testing # Dhaka #Bangladesh #pumping #overpumping #drinking #irrigation #regional #WQI #multivariate #monitoring #contamination #pollution #assessment #watersecurity
Benjamin Carr, Ph.D. 👨🏻‍💻🧬Dec 10, 2024
Ancient Crystal from #Sahara Reveals a Lost World of Martian Water
#<eteorite, nicknamed “Black Beauty,” is about 4.45B years old, dating to a time when #Mars was new. #Geochemical analysis of zircon grain revealed textural and mineral signatures of thermal water systems that existed on planet when this meteorite formed the earliest epoch in Martian history, known as Pre-Noachian period.
In other words, this grain preserves the oldest direct evidence of hot #water on Mars
https://www.404media.co/nanopasta-is-200-times-smaller-than-human-hair-3/
An Ancient Crystal from the Sahara Reveals a Lost World of Martian Water

This week, we’ll travel to ancient Mars, indulge in record-breaking “nanopasta,” check out nature’s version of fiber optic cables, and behold a galactic jellyfish.

404 Media
Nina DavtianNov 26, 2024
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:
https://doi.org/10.1186/s40645-024-00664-5
#Science
#ScienceMastodon #AcademicMastodon
#PaleoClimate #SeaTemperature #SeaSurfaceTemperature #SST
#Geochemistry #Foraminifera #MgCa #Biomarkers #Alkenones #GDGTs #isoGDGTs
Replicability of paleotemperature records in the northern Okinawa Trough and its implications for paleoceanographic reconstructions - Progress in Earth and Planetary Science

Geochemical 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.

SpringerOpen
Preindustrial Public HealthSep 4, 2024

3/ 🧵 The seminar will cover the MINESCAPES Summer School of June this year, and fieldwork in Sardinia in May, which took an extensive #geochemical survey in the Antas Valley to explore the long-lasting impacts of 13-14th century mining.

#archaeometallurgy #summerschool

Preindustrial Public HealthSep 4, 2024

2/ 🧵 Presentations are by leading scholars in #preindustrial mining communities and the history of science and technology: Pamela H. Smith, Tina Asmussen, Nicolas Minvielle Larousse, Guy Geltner, +

#extraction #historyoftechnology #archaeology #geochemical

INSTAARJun 14, 2024

🚨New paper: The #hydrologic & #geochemical contributions from snow to streamflow in the McMurdo Dry Valleys of Antarctica

This first quantification of melting snow (vs glacier ice) shifts views of Valley's hydro cycle, algal mat growth, & future changes https://onlinelibrary.wiley.com/doi/10.1002/hyp.15195

The Big Data ClusterJan 27, 2024

"Physical and biogeochemical drivers of solute mobilization and flux through the critical zone after wildfire" just added to our Publications library.

This study analyzed a nine-year series of #nutrient concentrations in three forested catchments in #NewMexico. It focused on chemical changes following a 2013 #wildfire, revealing long-term #geochemical impacts and recovery patterns.

Read this paper: https://bit.ly/3w1Kw7a

Browse our library: https://bit.ly/CZNBDPubLibrary

#CriticalZone #SciComm

Physical and biogeochemical drivers of solute mobilization and flux through the critical zone after wildfire

A nine-year time series of nutrient cation and anion concentration and efflux from three forested catchments in the Jemez River Basin Critical Zone Observatory (JRB-CZO) in northern New Mexico was used to quantify the pulse of chemical denudation resulting from varying levels stand-replacing wildfire intensity in May-June of 2013. The 3 years of pre-fire and 6 years of postfire data were also probed to shed light on the mechanisms underlying the pulsed release and the subsequent recovery. The initial large solute pulse released to the streams—K+, Ca2+, Mg2+, SO42-, Cl−, dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), and total dissolved nitrogen (TDN)—was caused by leaching of hillslope ash deposits during the first monsoon storms post-fire. Debris flow following the wildfire likely redistributed much of the ash-containing sediments along streams and valley bottoms. Sustained elevated solute concentrations observed in the surface waters throughout the post-fire period relative to pre-fire baselines is consistent with these soluble materials being periodically flushed from the soils during wet seasons, i.e., snowmelt and summer monsoons. As microbial mediated reactions and biotic uptake—due to plant regrowth—recover after fire, nutrient ion export (e.g., NO3-, Cl− and SO42-) steadily decreased toward the end of the post fire period, but remained above pre-fire levels, particularly for NO3- and SO42-. Surface water concentrations of polyvalent cations (e.g....

Frontiers
💧🌏 Greg CocksMay 17, 2023
Water Availability Creates Global Thresholds In Multidimensional Soil Biodiversity And Functions
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https://www.nature.com/articles/s41559-023-02071-3 <-- shared paper
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#GIS #spatial #water #mapping #water #hydrology #biogeography #phylogeography #geography #global #environmental #biodiversity #productivity #agricultural #agriculture #farming #plant #microbe #soilscience #soilhealth #soil #soilfertility #soilconservation #soilmanagement #ecosystems #EnvironmentalThresholds #survey #fieldsurvey #climate #vegetation #watermanagement #waterconservation #rainfall #precipitation #EV #evaporation #evapotranspiration #biogeochemical #geochemical #bacteria #fungi #protists #invertebrates #model #modeling #soilcarbonsequestration #wateravailability #sustainable
Water availability creates global thresholds in multidimensional soil biodiversity and functions - Nature Ecology & Evolution

A global field survey of 383 sites with different vegetation types spanning an environmental gradient reveals that soil biodiversity and functions exhibit pervasive nonlinear behaviours worldwide and are mainly governed by water availability.

Nature
Scientific FrontlineFeb 28, 2023
#Steel tools were already in use in #Europe around 2900 years ago. Using #geochemical analyses, the researchers were able to prove that stone stelae on the #Iberian Peninsula that date back to the Final Bronze Age feature complex engravings that could only have been done using tempered steel.
#Archeology #BronzeAge #sflorg
https://www.sflorg.com/2023/02/arch02282301.html
Steel Was Already Used in Europe 2900 Years Ago

Team headed by Freiburg researcher has discovered earliest use of steel in Europe