Articles tagged with Geochemistry
Researchers analyzed fossil specimens and tooth enamel to determine Australopithecus diet; found herbivorous hominins with low animal protein intake, challenging previous theories on human evolution
Researchers from Göttingen University and Max Planck Institute for Solar System Research discovered the Moon formed from material ejected from the Earth's mantle. The findings support the idea that water reached Earth early in its development, contrary to the prevailing assumption of late impacts.
Kevin Rosso, a senior scientist at PNNL, has been recognized as a Battelle Fellow for his exceptional contributions to Earth and space science. He leads research on the role of minerals in energy storage and release, with applications in geothermal energy systems.
A global study on microbiomes in subsurface environments reveals astonishingly high microbial diversity, rivaling that at the surface. The study, led by Emil Ruff, also compares marine and terrestrial microbiomes, finding great differences in composition but similar levels of diversity.
A Curtin University-led study has found geochemical 'fingerprints' of water-rich fluids in a 4.45 billion-year-old zircon grain from the Martian meteorite NWA7034. This discovery opens up new avenues for understanding ancient Martian hydrothermal systems and the planet's past habitability.
A new study estimates a 1-meter sea level rise by 2100 will affect over 14 million people and $1 trillion worth of property along the Southeast Atlantic coast. The study emphasizes the need for holistic coastal resilience strategies to address multiple climate-related hazards.
An international team of researchers has confirmed the location of the oldest ochre mine in the world, dating back around 48,000 years. Ochre was found to have spread from the mine to nearby areas, revealing ancient extraction and transport networks.
A groundbreaking study led by Virginia Tech provides the first direct geochemical evidence of a massive, rapid melting period on Earth after the last global ice age. The researchers analyzed lithium isotopes in carbonate rocks formed during this time and found strong evidence for freshwater meltwater interacting with the ocean.
Researchers developed a new mantle-flow model explaining the puzzling deformation of the North China Craton, citing subduction and flat-slab subduction as key factors. The study sheds light on cratons' life cycle and geological processes, potentially leading to a more sustainable future.
Scientists use modern technology to analyze ancient ochre samples, revealing the material's origin and history. This helps them understand how human cognition and social networks developed alongside early technological innovations.
A new predictive model estimates that up to 95 million Americans may rely on contaminated groundwater for drinking water before treatment. This highlights the need for increased monitoring and awareness of Per- and polyfluoroalkyl substances (PFAS), which are linked to adverse environmental and health effects.
A new study reveals that a giant meteorite impact, equivalent to four Mount Everests, triggered a tsunami that mixed ocean debris and heated the atmosphere. This led to a rapid recovery of bacterial life, with iron-metabolizing bacteria flourishing in its wake.
Researchers found that rising temperatures accelerate weathering of rocks in the Canadian Arctic, leading to increased CO2 release and a positive feedback loop. This process could contribute significantly to climate change, with predicted emissions doubling by 2100 under moderate emission scenarios.
Researchers from Göttingen University identified the low crystallisation temperatures and groundwater origin of amethyst geodes in northern Uruguay. The study proposes a new model explaining their formation, which could improve exploration techniques and lead to sustainable mining strategies.
New analysis of a lunar sample reveals volcanic eruptions on the Moon occurred as recently as 120 million years ago. Researchers found three tiny glass beads with high abundances of KREEP elements, suggesting localized heating and small-scale magma eruption.
Scientists have identified the Chicxulub impactor as a rare carbonaceous asteroid, shedding light on the mass extinction event that occurred 66 million years ago. The findings suggest that the asteroid's unique composition and extraterrestrial origin are consistent with an outer Solar System origin.
A study by ETH Zurich scientists found that global warming's effects on plant recovery can last for thousands to millions of years. The research team discovered that the severity of climate shifts and the speed at which carbon is sequestered affect the duration of climate warming.
A nearly continuous 1268-meter-long drill core of serpentinized abyssal mantle peridotite has provided new insights into Earth's deep geology and the potential biogeochemical conditions involved in the origins of life. The findings reveal significant mineralogical variations, including low pyroxene content and oblique melt migration.
A new study from the University of Illinois Chicago proposes an alternative theory for the formation of Earth's continents, challenging the long-held leading theory. The researchers used computer models to investigate the origin of Archaean zircons, which date back to 2.5-4 billion years ago.
Researchers explored ancient interactions between life and the environment during the Phanerozoic Eon, a period of significant habitability improvements. They found that ocean algae played a crucial role in reducing atmospheric carbon dioxide levels and increasing oxygen levels, allowing for the evolution of more complex life forms.
A new study found that urban moss in older Portland neighborhoods has up to 600 times higher lead levels than rural areas, with concentrations linked to old telecommunications cables. The findings raise concerns about lead exposure and recommend avoiding soil disturbance in affected areas.
New modeling study reveals ephemeral streams contribute up to 55% of US river flow, playing a crucial role in transporting pollutants and nutrients. The findings highlight the importance of including these temporary streams under federal clean water regulations.
Researchers used stable oxygen isotope Delta-O-18 to analyze ITCZ changes over 30,000 years. The study identifies main components for ITCZ size, strength, and position influenced by Earth's axis inclination and orbit eccentricity.
Researchers analyzed local earthquakes and geochemical data from recent lava samples to determine the source of eruptions. The evidence implies a moderately-sized magma reservoir delivering magma to the surface, indicating continued volcanic episodes into the future.
Biogenic sources of VOCs dominate summertime air pollutant formation in Los Angeles, increasing with temperature. Temperature-dependent emissions drive ozone and secondary organic aerosol pollution, with roughly 60% formed through biogenic VOC emissions.
Analysis of nuclear bomb testing reveals plants store more carbon, with a shorter storage duration than previously estimated. Current Earth system models underestimate carbon uptake into terrestrial vegetation and soils.
Nitrous-oxide emissions have increased by 40% over the past four decades, resulting in accelerating atmospheric accumulation of this potent greenhouse gas. Agricultural production is the largest source of emissions, and improving practices can help reduce nitrous-oxide emissions and water pollution.
A review study published in Nature Reviews Earth & Environment highlights the need for better monitoring of changes in soil and surrounding ecosystems after wildfires. This enhanced monitoring could inform decisions on treating drinking water sourced from burned areas, reforestation, and protecting workers against toxins.
Researchers found that weathering in the region leads to an overall CO2 uptake, but near-surface processes only determine the CO2 balance in areas with a thick and cold crust. In contrast, the western side of the Central Apennines is a significant CO2 emitter due to deep-seated outgassing from carbonate rocks.
A new study using atmospheric isotopes suggests Io has been volcanically active for its entire 4.57 billion-year history, driven by tidal heating. The findings indicate that Io has lost most of its sulfur through volcanic outgassing and recycling, supporting a long-lived volcanic history.
Researchers suggest using DOM to assess freshwater chemodiversity and monitor pollution effects on ecosystem health. High-resolution mass spectrometry can help pinpoint pollution sources, including those in drinking water.
A recent study found that microbial communities thrive on inactive hydrothermal vent smokers, producing organic carbon and fixing CO2. These ecosystems are crucial for understanding the deep-sea carbon cycle and its interactions with the environment.
A new study found that atmospheric carbon dioxide (CO2) drawdown from chemical weathering of rocks is limited to a narrow range of moderate erosion rates. This has significant implications for understanding the constraints of weathering-mediated CO2 drawdown and resolving conflicting data on its impact on the climate.
Researchers propose that cosmic dust, rich in essential elements, accumulated on early Earth's surface near melting glaciers, sparking prebiotic chemistry. Simulations suggest these environments could have produced the organic molecules necessary for life.
Researchers found evidence of hydrothermal or metamorphic activity within the icy dwarf planets Eris and Makemake, which have methane deposits with geochemical origins. The discovery suggests elevated temperatures in their rocky cores, potentially leading to liquid water and habitability.
The samples from Wild 2 comet have revealed a record of the solar system's dynamic formative years, shedding light on the events that shaped its history. Researchers have found unusual carbon-iron assemblages and precursors to igneous spherules in the comet material.
The 2023 Geothermal Rising Conference highlights growing interest in superhot rock geothermal, with papers validating its viability for high power output and small spatial footprint. Researchers are developing new technologies to access these resources, including millimeter wave energy to drill deeper holes.
Researchers analyzed dolomite rocks and found a high proportion of C-13, indicating strong methane formation by microorganisms in water with low sulphate content. The sediment's chemical development is controlled by crater floor cooling and water supply, not climatic changes.
Researchers have discovered that dolomite crystal growth requires cycling of saturation conditions, resolving the 'dolomite problem' that has puzzled scientists for nearly two centuries. This process can speed up dolomite growth by up to 10 million times, which may be crucial for producing large amounts of dolomite on Earth's surface.
Scientists discover new sulfur cycle mechanism in Lake Superior's ancient waters, highlighting the crucial role of organic sulfur compounds. The findings provide insight into how sulfur was cycled in Earth's oceans billions of years ago.
Scientists have found evidence of past oxygen loss in the world's oceans during glacial periods, indicating that current climate change may not be permanent. The discovery was made by analyzing seafloor sediments from the past 145,000 years, which showed a build-up of cobalt during the last ice age.
Scientists have discovered a simple test for signs of past or present life on other planets, using artificial intelligence to distinguish between biological and abiotic samples with high accuracy. The method has the potential to revolutionize the search for extraterrestrial life and deepen our understanding of Earth's earliest life.
An international team of scientists has discovered a link between Earth's ancient atmosphere and the chemistry of its deep mantle. The study found that sediment recycling provided atmospheric access to the mantle, leading to increased oxidation of calc-alkaline magma and altering the composition of the continental crust.
Researchers confirm fracking triggers tremors, which can be used to track fluid movement and monitor fault activity. This finding has implications for sustainability and climate science, as carbon sequestration through fracking may reduce atmospheric emissions.
A team of scientists led by University of Alaska Fairbanks geology professor Sarah Fowell are collecting samples from beneath the sea floor to learn about vegetation and climate of region 25,000 years ago. The project will be shared via digital and social media channels.
Researchers found evidence of 2.9 billion-year-old glaciers in South Africa using relative oxygen isotope concentrations and physical proof. The discovery suggests the presence of continental ice caps at that time or a previously unknown 'snowball Earth' period.
Researchers at Arizona State University have developed a method to mix sodium with lithium in high-quality batteries, driving down costs and ensuring the supply. The technique uses a specialized technique to measure energetic stability, allowing for a more stable mixture of up to 20% sodium.
Researchers found large quantities of plastic mulch fragments in strawberry fields, negatively impacting soil qualities and microbial respiration. The study's findings suggest that biodegradable or natural mulches could be alternatives to reduce long-term plastic pollution.
A team of international scientists has discovered a large granite mass buried under the surface of the Moon's far side, measuring 50km across. This finding is unexpected, as granites are nearly absent in the Solar System outside of Earth.
A new study published in the Proceedings of the National Academy of Sciences confirms that the Megalodon shark was warm-blooded, with a body temperature estimated at around 27°C. This discovery provides empirical evidence for the extinct species' internal heat production, shedding light on its biology and ecological role.
A team of researchers led by Dr. William Gilhooly III found that viruses are infecting sulfur bacteria, altering their genetic code and influencing their behavior in oxygen-deficient lakes. This discovery opens up new avenues for understanding the impact of viral infections on bacterial ecosystems.
Researchers have pushed back the age of the massive Ontong Java Plateau eruption by 10 million years using high-precision argon isotope dating. The revised dates suggest the event occurred after the onset of Ocean Anoxic Event 1a, challenging previous theories about its cause.
A team of researchers led by Indiana University's Chen Zhu aims to understand the chemical processes that trap CO2 in rocks. They will employ an isotope tracer method to investigate basalt-CO2-water interactions, which have shown potential for rapid carbon storage.
New research by Oregon State University suggests the Ontong Java Plateau is younger and its eruption was more protracted than previously believed. The findings contradict long-held assumptions about the formation of the plateau being linked to a global oxygen-depletion event that formed black shale deposits worldwide.
A study by University of Zurich researchers found that global warming is accelerating the decomposition of soil humus and affecting plant storage of carbon. The findings have significant implications for relying on soils as a natural carbon sink to tackle global warming.
The InVADER Mission successfully deployed a high-tech laser laboratory on the ocean floor, marking a paradigm shift in ocean research and exploration. The Laser Divebot collects compositional data without disturbing the environment, removing the need for physical samples.
Existing global forests could store an additional 44.1 petagrams of carbon if left unmanaged, but this would only offset 4 years of CO2 emissions under current rates. The study's findings highlight the limited carbon sequestration potential of unmanaged global forests.
The study analyzed 45 copper objects from Northern Central Europe and Southern Scandinavia, revealing changes in distribution networks across prehistoric Europe. The findings suggest that copper artefacts originated primarily from southeast Europe before 3500 BC, with later sources including the Eastern Alps and British Isles.
A study from Smithsonian researchers deepens understanding of Earth's crust by testing and eliminating the garnet hypothesis about why continental crust is lower in iron and more oxidized. The findings suggest that intense heat and pressure cannot produce the necessary conditions for garnet formation, contradicting a popular explanation.
Researchers found that golden fossils from Germany's Posidonia shale are primarily made up of phosphate minerals, hinting at the presence of oxygen in the environment. The discovery suggests that oxygen played a crucial role in driving chemical reactions needed for fossilization.