Articles tagged with Geologic History
A new study led by the University of Colorado Boulder has shed new light on the Great Unconformity, a mysterious gap in the Grand Canyon's rock record that covers hundreds of millions of years. The research suggests that a series of small faulting events may have caused rocks and sediment to wash away, creating the missing window of time.
A team of scientists from Princeton University found that the Arctic Ocean's nitrogen supply is limited by strong stratification, preventing plankton growth and potentially affecting fish populations. The research used fossilized plankton to study the history of nitrogen sources and supply rates in the western and central Arctic Ocean.
A new study suggests that small single-celled organisms may have formed larger multicellular life forms to better navigate icy waters. This shift in size allowed for increased propulsion and access to a wider range of food sources, giving early organisms an ecological advantage.
A new three-year project funded by the Heising-Simons Foundation is integrating science from paleoclimatology, geophysics, and astronomy to study the evolution of the Solar System and Earth-Moon dynamics. The CycloAstro Project will also investigate the Earth's paleoclimate system and improve cyclostratigraphy and astrochronology.
Caballero-Gill's project, part of the CycloAstro Project, focuses on training and developing diverse graduate students and postdocs, emphasizing socially conscious leadership and community engagement. Funding from the Heising-Simons Foundation will support this initiative until May 31, 2024.
A lunar sample from the Apollo 17 mission has been analysed to determine its age, source crater and geological trajectory. The study suggests the sample is around 4.2 billion years old, providing a valuable reference point for understanding the Moon's early evolution and Earth's origins.
New research from the University of Copenhagen reveals that the Tibetan plateau has increased in height over the past 15-18 million years due to a slow collision between the India and Eurasia tectonic plates. This finding sheds new light on Earth's evolution and provides a more accurate understanding of Tibet's geological history.
Researchers used directed evolution and mathematical modeling to test the Oxygen Control Hypothesis, finding that oxygen levels strongly constrain the evolution of macroscopic multicellularity. This contradicts previous theories suggesting oxygen should promote larger organisms.
Researchers used ancient zircons to reconstruct Earth's evolution and determine that modern plate tectonics emerged roughly 3.6 billion years ago. This finding suggests that the dynamic crust, which supports life on Earth, began to take shape during this time.
Researchers suggest that the 1700 Cascadia earthquake could be part of a longer-lived sequence of earthquakes, potentially spanning many decades. This hypothesis has significant implications for how earthquake hazard maps are created for the region, and may help explain why there is little geologic evidence of the event in some areas.
Past Global Changes Horizons is a scientific review that uses comics, pictures, and drawings to support short papers on past sciences and their relevance to the future. The magazine aims to inspire environmental awareness among teenagers and young adults, providing them with a platform to discuss and learn about pressing issues.
The Deep-time Digital Earth program is a 'big science' initiative that aims to transform research in deep-time Earth Science through data-driven abductive discovery. The program will create an open platform for linking existing deep-time Earth data and integrating geological data, enabling users to explore Earth's evolution by specifyi...
The study proposes a coupling model of the five spheres of the earth system with the oxygen cycle as the core. Key findings include the link role of the oxygen cycle in shaping our current habitable Earth and its effects on modern and geological time scales.
A new study analyzes thousands of geological features to quantify the response of ancient eolian systems to global climatic shifts. The results demonstrate that preserved sedimentary architectures developed under icehouse and greenhouse conditions are fundamentally different due to contrasting environmental conditions. This research ca...
A study published in Science Advances has found rare evidence of the Earth's early magma ocean preserved in ancient rocks from southwestern Greenland. The discovery provides a window into the planet's solidification and internal chemistry, suggesting that other rocks may also preserve signs of ancient magma oceans.
A new study suggests that Earth's oxygen-rich atmosphere will likely persist for around one billion years, with a high degree of uncertainty. The researchers used a numerical model to simulate climate and biogeochemical processes, finding that the atmosphere will probably decline in oxygen levels due to CO2 scarcity.
A new study by Tel Aviv University reveals that a devastating earthquake measuring 6.5 on the Richter scale is expected to hit Israel in the coming years. The research analyzed 220,000 years of geological record from the Dead Sea and found that earthquakes with this magnitude occur every 130-150 years on average.
Researchers at the University of Colorado Boulder discovered a link between ancient cyanobacteria and the Great Oxygenation Event. The study suggests that these single-celled organisms played a crucial role in transforming the planet's chemistry, producing oxygen gas that paved the way for life on Earth.
Researchers use dust in deep sea sediments to track ancient wind patterns, finding evidence that atmospheric circulation will change with climate warming. The study suggests the westerlies may continue to migrate poleward as temperatures rise.
Researchers discovered that mantle convection on early Earth was surprisingly slow and spatially restricted until around 3 billion years ago. This finding suggests that the onset of modern plate tectonics triggered the emergence of large continental masses and an oxygen-rich atmosphere, setting the stage for complex life.
Scientists propose a new way to categorize minerals by incorporating historical data, highlighting the importance of understanding a sample's formation process. The IMA system is criticized for being time-independent, while the proposed approach uses 'historical natural kinds' to reflect changes in Earth's diversity.
During the 2018 eruption of K?lauea Volcano, Hawaiian researchers leveraged pre-assembled stations with virtual machines to continue monitoring data despite instrument destruction and network failures. This enabled quick deployment and rerouting of data to scientists and decision-makers.
The UCR-led team is studying Earth's diverse chapters of history to find templates for examining exoplanets. By analyzing ancient rock samples and modern sediments, the team will design telescopes and refine models to detect biosignature gases in distant exoplanet atmospheres.
The study reveals that the release of internal primordial heat caused large melting in the shallow mantle, extruding magma onto the Earth's surface. This led to the formation of keels of the first continents and made them weak and prone to destruction. The process resulted in the emergence of life on Earth.
Research suggests that some parts of the Alpine Fault, particularly around Hokitika and Greymouth, may experience strong ground shaking more often than previously thought. The study found evidence of a 19th-century earthquake along the fault's northeastern end, indicating that smaller earthquakes could occur between large rupture events.
Researchers found diverse organic compounds can easily form polymers under primitive conditions and even spontaneously create cell-like structures. This discovery sheds light on the origin of life, suggesting alternative polymers may have played a key role in early biological evolution.
Scientists at Imperial College London have developed a method to estimate the likelihood of future earthquakes in high-risk areas, improving precision by up to 49%. By analyzing rare atoms in precarious balance rocks (PBRs), they created a new technique to validate earthquake hazard estimates.
New study from University of Tokyo researchers calls into doubt a long-held theory about the early solar system. They found evidence that asteroid Vesta was hit by multiple impacting bodies around 4.4 billion to 4.15 billion years ago, earlier than previously thought.
A new global climate reference curve reveals the natural variability and extreme climate events that occurred during warm climate states over the last 66 million years. The study provides context for ongoing anthropogenic change and its potential to exceed natural variability.
Researchers investigate strata spanning critical intervals in Siberia to link eukaryotic evolution and Cambrian Explosion with deep-Earth processes. The study aims to provide insights into the coupled evolution of life and environment in Earth history.
The Hengduan Mountains have the most extensive alpine flora history, dating back to the early Oligocene. This was shaped by past geological and climatic events, including mountain building and climate change.
Researchers reconstructed natural runoff history for the middle reach of the Yellow River from 1492 to 2013 CE, finding reduced runoff and sediment load due to human activities. The study provides an important model for distinguishing anthropogenic influence from natural variability in global change studies.
Researchers from Curtin University have found evidence that the Earth's first continents were not formed by subduction in a modern-like plate tectonics environment. The team measured iron and zinc isotopes in rocks sourced from central Siberia and South Africa, suggesting an alternative formation process.
Researchers suggest that radioactive elements uniquely distributed after the Moon-forming collision led to the near and far sides' differences. The unique composition of KREEP rocks, linked to radioactively unstable elements, provides a key explanation for the Moon's asymmetry.
Scientists analyzed mineral data from glaciers to determine Earth's climate before the Neoproterozoic glaciation. They found that the planet may have experienced a gradual cool-off into a Snowball Earth state, rather than an abrupt transition.
Researchers found isotopic evidence of early Earth differentiation in samarium and neodymium isotope ratios. The study suggests that plate tectonics have regulated the planet's chemical evolution since its history began.
Researchers have found evidence of a major 'stirring up' in the mantle layer around 3.2 billion years ago, indicating the start of global plate tectonic activity. This discovery has implications for our understanding of the evolution of life on Earth and the formation of mineral and energy resources.
Researchers from GFZ GeoForschungsZentrum Potsdam found that the rotation of the Victoria microplate is controlled by the configuration of weaker and stronger lithospheric regions. They used 3D numerical models to compute the dynamics of the last 10 million years, showing a best fit with GPS-derived data.
A new study published in Geology has discovered two newly identified super-eruptions associated with the Yellowstone hotspot, indicating a possible decline in its intensity. The Grey's Landing super-eruption is now the largest recorded event of the entire Snake-River-Yellowstone volcanic province.
Researchers have discovered that current CO2 levels surpass a 23-million-year-old record, suggesting unique greenhouse disruption. The findings imply that ecosystems and temperature might be more sensitive to smaller changes in CO2 than previously thought.
A Bayesian statistical analysis of life's emergence and development on Earth predicts that if history were repeated, life would likely emerge similarly early. However, the emergence of intelligence might not guarantee a repeat occurrence due to its rarity.
A new study using Bayesian statistics estimates the odds of life and intelligence emerging on planets similar to Earth, suggesting that complex extraterrestrial life is possible. The analysis indicates that life should have little problem spontaneously emerging on other planets, but intelligent life is less likely.
Researchers from UBC have discovered a new timeline for the ancient magnetic field on Mars, with evidence of dynamo activity at 4.5 billion and 3.7 billion years ago. The findings suggest that the Martian dynamo was active earlier than previously thought, providing insights into the planet's thermal history and evolution.
Harvard researchers have detected some of the earliest evidence for modern-like plate motion in ancient rocks from Australia and South Africa, dating back to 3.2 billion years ago. The study suggests that tectonic movement occurred on the early Earth, providing valuable insights into the evolution of life and climate.
Cornell University astronomers created five models representing key points in Earth's evolution to aid the search for exo-Earths. These templates enable the identification of potential biospheres on distant planets with characteristics similar to our own, using powerful telescopes like NASA's James Webb Space Telescope.
Researchers found strikingly high molybdenum, uranium, and rhenium concentrations in drill cores from shungite rocks, suggesting elevated oxygen levels at the time of their deposition. The discovery contradicts prevailing models of Earth's carbon and oxygen cycles and has implications for understanding the evolution of complex life.
New studies propose that Earth's mantle, rather than its core, was responsible for generating the planet's early magnetic field. This concept is supported by estimates of thermodynamics of magnetic field generation within the liquid portion of the early Earth's mantle.
Scientists from the University of Cologne found that water, carbon, and nitrogen were delivered to Earth very late in its history, contradicting previous assumptions. The researchers used rare platinum metal isotope abundances to constrain the delivery time, suggesting a late veneer phase around 3.8 billion years ago.
A new study of fossil mollusk shells from the late Cretaceous period found that a day lasted 23.5 hours, with ocean temperatures reaching up to 40 degrees Celsius in summer and exceeding 30 degrees Celsius in winter. The ancient shell revealed unprecedented detail about the animal's growth rate and water conditions.
Researchers find tiny iron crystals on asteroid Itokawa's surface, formed by space weathering and the release of iron from troilite minerals. The discovery provides insights into weathering processes on other celestial bodies and helps date asteroids.
Researchers found multiple faults with evidence of over 10 meters of slip during past large earthquakes in the Japan Trench fault zone, revealing a complex history of seismic activity. The technique used to analyze organic molecules in sedimentary rocks provides new insights into the likelihood of future tsunamis and earthquake hazards.
Scientists have discovered evidence that the magnetic field forming around Earth was even stronger 4 billion years ago, generating a protective shield from harmful solar wind and cosmic rays. This finding has implications for understanding the future sustainability of Earth's magnetic shield and its potential for supporting life.
Researchers suggest a ring-like structure in the early solar system may have created a compositional dichotomy between terrestrial and jovian planets. This division may have led to the presence of organic molecules on Earth, supporting life.
Researchers found a 550-million-year-old fossilized digestive tract that challenges our understanding of early animal evolution. The discovery resolves the debate over the evolutionary positioning of cloudinid fossils from the Ediacaran Period.
A new study has recalculated the magnitude of the Great Lisbon Earthquake from 8.5 to 9.0 to 7.7 using macroseismic data from Portugal, Spain, and Morocco. The analysis suggests that the earthquake's epicenter was offshore the southwestern Iberian Peninsula and may have involved faulting onshore.
Researchers found that a shallow frozen ground layer present in winter months can lead to greater ground failure and damage after earthquakes. The study on two historical earthquakes in Kazakhstan shows that the presence of this layer can generate more severe ground fracturing during earthquakes in the winter.
Researchers found that a shallow frozen ground layer likely caused more ground failure in the 1911 Kemin earthquake due to its ability to inhibit drainage of pore-pressure excess. The study suggests seismologists should consider seasonality in soil characteristics when making probabilistic liquefaction or ground failure assessments.
A comprehensive analysis of the Ridgecrest Earthquake Sequence reveals a web-like network of interconnected faults, challenging standard models of large seismic events. The complexity of the rupture is only clear due to the combined data from orbiting radar satellites and ground-based seismometers.
Researchers at the University of Münster have discovered a new composition of the Earth's mantle, suggesting that large parts of it contain fewer incompatible elements. The study found that more material from the mantle has melted to form the Earth's crust than previously thought.
Researchers at Arizona State University have discovered the largest known impact crater in the US, which was formed 35 million years ago and lies buried beneath the Chesapeake Bay. The crater's age was determined using a new dating technique, providing valuable insights into the Earth's history.