Articles tagged with Geochemistry
Researchers found that both free water and bound water slowed the intensity of pyrolysis reactions and increased biochar yield. A biomass water content of around 30% may offer a practical balance for pyrolysis, balancing biochar yield and energy demand.
Researchers found that ancient hominins selected specific basalt sources for tool production, demonstrating advanced planning abilities and long-term technological traditions. This discovery highlights the ability of Acheulian hominins to plan, select, and exploit geological resources within a changing landscape.
Researchers from Tokyo Metropolitan University propose a compact X-ray telescope for mapping the entire Moon surface, overcoming technical challenges that have hindered previous missions. The team's simulations demonstrate feasibility and show that it could be done in two years with five key elements.
A new study found that biochar can lower the temperature sensitivity of nitrous oxide emissions in agricultural soil but increase it in forest soil. Researchers tested different soils and biochar treatments and found that temperature was the dominant driver of nitrous oxide emissions, while biochar acted as a secondary modulator.
A new study reveals how combining crop straw with biochar may help soils build humic substances that are both chemically active and structurally persistent. The research found that straw and biochar do more than just add carbon to soil, reorganizing the molecular building blocks of humic acid.
A Umea University study finds that ice actively accelerates the dissolution of iron minerals, potentially releasing more iron than current environmental models account for. This could have significant cascading effects on ecosystems, particularly in polar and mountain regions.
A new study found that dust from volcanic and ice-free regions replaced traditional sources, indicating a significant retreat of the West Antarctic Ice Sheet. The research suggests that sea levels could rise by three to five meters due to melting.
False-negative results may lead to overlooking environments that could harbor life beyond current detection capabilities. Researchers emphasize the need for targeted research strategies, combining laboratory experiments with modeling research and fieldwork to address these risks.
Researchers at the University of Toronto and the University of Ottawa have discovered large volumes of natural hydrogen in the Canadian Shield, which could provide a domestic source of cost-effective energy. The study suggests that harnessing this resource could reduce greenhouse gas emissions and support local industry hubs.
A new study reveals that even the most remote corners of the ocean are contaminated with zinc from human sources, surpassing natural zinc levels. Zinc from fossil fuel combustion and industrial emissions dominates the upper layer of the South Pacific, posing a potential threat to marine life and nutrient balances.
A new study reveals how responsive Greenland's ice sheet is to climate change, with widespread methane release linked to an episode of warming around 4,000 years ago. The findings highlight the role of recent ice margin fluctuations on subglacial carbon cycling, with implications for global methane budget assessments.
Researchers create model connecting nuclide signal fluctuations to progressive changes in rock structure leading to critical failure. This allows for early warning of geohazards such as landslides and avalanches.
Quaise Energy is building the world's first power plant using superhot geothermal energy, with the goal of producing at least 50 megawatts of clean electricity. The project aims to harness temperatures greater than 300 degrees C and validate its long-held hypothesis that higher subsurface temperatures can improve power production.
A new study finds that water masses from the Southern Hemisphere have been a major contributor to the Indonesian Throughflow for over 800,000 years. The researchers measured nitrogen isotopes in sediment cores and found a remarkable long-term stability of the nitrogen cycle along the equatorial Pacific.
Researchers found that biochar can either dampen or amplify temperature sensitivity of nitrous oxide emissions in soils. Biochar's effects depend on soil properties and environmental conditions.
Research suggests that hydrous and repeated mantle melting is key driver of gold enrichment in island arc magmas. The study found that high-degree melting leads to significant concentrations of gold, often several times higher than those found in mid-ocean ridge basalts.
Researchers from the University of Tokyo have discovered a link between tropical volcanic eruptions and droughts in Asia. The study found that large eruptions can suppress monsoon convection, leading to reduced precipitation and droughts.
Researchers Paolo Sossi and Dan Bower found that the Earth is composed entirely of non-carbonaceous material, originating from the inner Solar System. This conclusion contradicts previous theories suggesting a significant contribution from the outer Solar System.
A new study reveals that freeze-thaw cycles can dramatically improve biochar's ability to trap toxic arsenic in contaminated soils. The research found that freezing and thawing fundamentally reshapes how biochar interacts with soil at microscopic scales, creating stronger connections between biochar particles and soil minerals.
A new study in Sweden reveals that primary forests store up to 72% more carbon than managed secondary forests. Soils account for the largest carbon store and convertion may have a greater climate impact than previously thought.
A new study from Washington State University sheds light on the formation of mineral deposits in Idaho's Silver Valley and the Idaho Cobalt Belt. Ancient brines helped concentrate metals and transport them to the surface, where they formed rich veins of ore.
A new study suggests that chemical weathering beneath thick continental ice sheets may have consumed atmospheric carbon dioxide and prolonged global glaciations during the snowball Earth event. This process could have slowed atmospheric warming and delayed deglaciation, helping to explain the long durations of some snowball Earth events.
Researchers compared mineralization of calcium phosphate on titanium dioxide nanoparticles coated with zein and polydopamine, finding PDA-coated particles accumulated more mineral mass. The study's findings could guide the design of better implants, water purification materials, and sensing technologies.
Researchers track ancient carbon's path in sea and its uptake by microorganisms, revealing a 30% biomass share. Photosynthesis also plays a role in assimilating hydrothermal carbon, but only a small proportion remains in the local ecosystem.
Researchers at Tongji University identified ferrihydrite as the mineral that effectively traps chromium while storing organic carbon. The study's findings provide a new blueprint for environmental remediation using nature-based solutions to clean up contaminated mine soils and fight climate change.
A team of researchers at the Institute of Industrial Science, The University of Tokyo, developed an ensemble technique to improve climate modeling by tracing water molecules' movement. They found a general increase in atmospheric water vapor associated with warming temperatures, linking it to large-scale climate phenomena.
A UT San Antonio-led research team identified chitin in trilobite fossils over 500 million years old, offering new insights into fossil preservation and the long-term carbon cycle. This discovery has significant implications for understanding how organic carbon is stored in Earth's crust over geologic time.
New research suggests that parts of ancient Earth formed continents and recycled crust through subduction over 4 billion years ago. The study of zircons found in Western Australia challenges models that considered early Earth as a stagnant, unmoving 'lid' with no continental crust.
An international team has successfully documented and sampled freshened water within a zone nearly 200 metres thick beneath the ocean floor. This discovery sheds light on offshore freshened groundwater systems and their relevance to coastal communities relying on groundwater for freshwater supply.
Researchers found a surprising correlation between West Antarctic Ice Sheet retreat and marine algae growth over the past 500,000 years. The study suggests that global warming may lead to reduced CO2 uptake if the ice sheet continues to shrink.
A new study from the University of Copenhagen suggests that flooding low-lying areas in wetlands may not be the most effective way to mitigate climate change. Instead, maintaining a stable water table below ground level can help reduce methane emissions and promote CO2 sequestration, according to researchers led by Professor Bo Elberling.
A new study reveals a surprising link between West Antarctic Ice Sheet retreat and algae growth over the past 500,000 years. Iron-rich sediments from icebergs stimulate algae growth, but in a less bioavailable form than previously assumed.
A study published in Current Anthropology analyzed hair samples from Turkana communities to understand their dietary habits, revealing a dynamic and interconnected economy. The research challenges assumptions about pastoralism and highlights the ability of herders to adapt to volatile conditions.
Researchers discovered that a significant drop in calcium levels in the ocean led to a massive decrease in carbon dioxide, driving global cooling and ending the planet's greenhouse era. The study suggests that changes in seawater chemistry played a key role in shaping climate history.
New research reveals that land subsidence caused by humans is the main culprit behind delta sinking, posing increased flooding risk to 236 million people. The study identifies groundwater extraction as the dominant cause of subsidence, highlighting the need for urgent local interventions.
Dr. Kelley's discovery of the Lost City Hydrothermal Field revolutionized scientific understanding of fluid–rock interactions and chemosynthetic ecosystems. Her work has also transformed ocean observation through the NSF's Ocean Observatories Initiative Regional Cabled Array.
Researchers used clumped-isotope palaeothermometry to reconstruct large temperature fluctuations at depths of up to 4,000 meters in the Southern Ocean. These fluctuations occurred simultaneously with changes in oxygen isotopes and Earth's orbital eccentricity, suggesting a climatic forcing.
The study found that organic materials in sediments decompose under supercritical conditions, releasing hydrogen molecules. This process is a more significant source of dissolved hydrogen in the ocean than previously believed.
Researchers at Harvard John A. Paulson School of Engineering and Applied Sciences quantify the role of climate change in wildfires and air quality, finding that 60-82% of total burned area in western US forests is directly attributable to warming temperatures and drier conditions caused by climate change.
Researchers discovered that bridgmanite acts like a microscopic 'water container', allowing early Earth to retain substantial amounts of water in the mantle as it solidified. This retained water played a crucial role in transforming the planet from an inferno into a habitable world.
A new study has uncovered hidden stories of pollution, gender, and life in industrializing Britain by analyzing bone chemistry and isotopic analysis of skeletal remains from two English towns. The findings reveal that exposure to toxic elements varied significantly across communities, sexes, and social identities.
A team of scientists simulated high-pressure conditions and found that onion-like layering in iron alloys can explain seismic anomalies in the Earth's inner core. This discovery suggests a compositional gradient with increasing core depth, linking anisotropy to chemical stratification.
Researchers at the University of Maryland analyzed air samples from College Park, Md., and found that chemical compounds from Canada's historic 2023 fires persisted in the atmosphere, forming an 'atmospheric soup.' The study provides insights into the long-term effects of wildfire smoke on human health and the environment.
Researchers at the University of Alberta have found evidence of abiotic nitrogen reduction, a reaction driven by minerals as catalyst, which likely produced necessary nutrients for life. This discovery sheds light on the faint young sun paradox and provides a key piece to understanding how life may have emerged on Earth.
A new study published in Nature Geoscience shows the key role of Antarctic Bottom Water in the transition from the last Ice Age. The expansion of AABW played a central role in releasing carbon dioxide into the atmosphere, which helped reduce atmospheric CO2 concentrations.
Researchers found that tropical forests may be less sensitive to climate change than thought. They discovered that dead leaves cool nearby leaves by reflecting more sun energy, reducing heat buildup.
Shear forces in volcanic conduits can create gas bubbles, leading to a decrease in pressure and preventing explosive eruptions. This process can occur even in magma with high gas content, explaining why some volcanoes flow gently despite being potentially explosive.
Researchers found Theia's iron isotopic compositions matching those of Earth and non-carbonaceous meteorites, suggesting it formed closer to the Sun than initial thought. High-precision analyses reveal Theia's origin in the inner Solar System, challenging previous models.
Researchers are studying the Great Oxygenation Event (GOE) using deep drilling in Gabon, Africa, to understand the timing and pace of oxygen accumulation. The project aims to provide clues about the changing amount of oxygen in the environment at the time.
Researchers at the University of California, Davis, found that rocks on fault lines can glue themselves back together within hours after a seismic event. This discovery challenges current models of fault behavior and suggests that cohesion may play a crucial role in major earthquakes.
Oceanic islands far from active plate tectonic boundaries contain materials that originate from continents. Researchers propose a new mechanism: 'mantle waves' scraping material from beneath continents, transporting it into the Earth's mantle and feeding volcanic eruptions. This process can occur without mantle plumes.
A new geochemical technique reveals that Arctic sea-ice coverage waxed and waned with atmospheric warming over the last 300,000 years, not ocean heat. This finding suggests that future reductions in Arctic sea ice will enhance biological nutrient consumption.
Researchers used lipid biomarker analyses to study survival strategies of microorganisms in extreme deep-sea ecosystems. They found that methane- and sulfate-metabolizing microbes can thrive in environments with high pH values and low organic carbon concentrations.
Experimental tests demonstrate that interactions between magma oceans and primitive atmospheres during early years can produce significant amounts of water. This process has major implications for the physical and chemical properties of planets' interiors, with potential effects on core development and atmospheric composition.
A new study reveals that dissolved organic matter in biochar enhances the metal-binding power of biochar, offering insights for safer cleanup strategies. The research found that chemical complexation is the dominant mechanism of immobilization, with carboxyl groups serving as key binding sites.
A new study found that different types of char can raise or lower greenhouse gas emissions from northern soils. Biochar tends to increase nitrous oxide emissions, while hydrochar suppresses it and even turns the soil into a small sink.
Researchers found that terrestrial-derived organic matter, primarily lignin, fuels microbial reactions leading to increased greenhouse gas emissions. However, as salinity increases upon approaching the sea, microbial activity slows down, reducing emissions and mitigating the effects of climate change.
A study finds that meltwater from a rapidly retreating glacier in Alaska contained lower concentrations of essential micronutrients like iron and manganese. This could alter the role glaciers play in delivering nutrients to the ocean, with significant implications for marine ecosystems and fisheries.