All articles tagged with #geoscience
New research published in Antarctic Science explains Blood Falls: the red water is iron oxide formed by ancient subterranean bacteria, while the liquid is a hypersaline brine kept unfrozen at -20°C; eruptions occur when pressure builds in subglacial channels beneath Taylor Glacier, forcing brine out in bursts and briefly slowing the glacier, with warming's future effects still unknown.
New research reveals that Earth's stable continents were formed by extremely high temperatures deep within the crust, driven by radioactive decay of elements like uranium and thorium, which facilitated the cooling and solidification of the crust. These processes, akin to forging metal, shaped Earth's landmasses and created a stable foundation for life, offering insights into planetary habitability and guiding the search for life on other planets.
Greenland has been shifting northwest by about two centimeters annually over the past 20 years due to ice melt caused by climate change, affecting its size and shape, with implications for geoscience and navigation; this movement underscores the accelerating impact of global warming on the Arctic, prompting increased awareness and conservation efforts worldwide.
Recent research highlights olivine's role in transporting water deep into Earth's mantle, revealing that only older, fast-moving oceanic plates can carry water to significant depths, which has major implications for understanding tectonic processes, seismic activity, and Earth's hidden water reservoirs.
Scientists have discovered massive 117-million-year-old mud waves beneath the Atlantic Ocean, indicating that the ocean's formation began earlier than previously thought, around 117 million years ago, driven by salt-laden water flows that reshaped the seafloor and redefined geological timelines.
A study using machine learning predicts the erosion rates of over 180,000 glaciers worldwide, revealing that most erode between 0.02 and 2.68 millimeters annually, with various environmental factors influencing these rates, providing crucial insights into landscape evolution and environmental management.
China has begun drilling a 10,000-meter borehole in the Tarim Basin to explore Earth's deep layers, aiming to uncover fossil fuels, understand seismic activity, and study Earth's geological history, with potential scientific and economic benefits.
Researchers sonified an ancient magnetic pole reversal from 780,000 years ago, creating an eerie auditory representation of Earth's magnetic upheaval during the Matuyama-Brunhes event, which likely impacted early life and marked the start of the Middle Pleistocene.
A new study reveals that the Ninetyeast Ridge, a massive underwater mountain range in the Indian Ocean, was formed by a moving hotspot, challenging previous beliefs that hotspots remain stationary. Researchers found that the Kerguelen hotspot moved several hundred kilometers within the mantle, creating the ridge as the Indian Plate drifted northward. This discovery, supported by basalt sample analysis, provides new insights into the dynamics of mantle plumes and tectonic plate movements, refining models of Earth's geological history.
An international team of researchers has conducted the first detailed study of minerals and microorganisms in lava tubes on Lanzarote, revealing insights into Earth's ancient ecosystems and potential implications for finding life on Mars. The study, led by Professor Bogdan P. Onac, found that the volcanic rock in these tubes preserves biosignatures, suggesting microbial activity. This research highlights the potential of lava tubes as refuges for microbial life, which could guide future Mars missions in identifying biosignatures.
China is drilling a deep borehole, Shenditake 1, in the Taklamakan Desert, aiming to reach 36,418 feet into the Earth's crust to study its internal structure and evolution. The project, led by China National Petroleum Corporation, has already reached over 32,808 feet in just 10 months, despite challenging conditions like high temperatures and pressure. This effort is part of a broader geoscience research initiative, contrasting with Russia's Kola Superdeep Borehole, which took 19 years to reach a greater depth.
Geoscientists have potentially solved the mystery of the D" layer, a molten rock layer deep within the Earth, suggesting it was formed by a collision with a Mars-sized planet billions of years ago. This impact created a magma ocean, where unique chemical reactions led to the formation of an iron-rich phase called iron-magnesium peroxide, explaining the layer's seismic heterogeneity and varying thickness.
A study published in the Nature Geoscience journal reveals that the 726 AD eruption of the Santorini volcano was larger than previously estimated, indicating an increased hazard potential. The findings challenge the belief that the volcano has been predominantly effusive since the Minoan eruption and suggest that it is capable of highly explosive eruptions. The study warns that a similar event today could have severe consequences for Santorini and its neighboring areas, including tsunamis, pumice rafts, and significant impacts on coastal communities, aviation, and maritime transportation.
An international team of scientists has uncovered evidence of a historical submarine eruption of the Kameni volcano on Santorini, supporting historical records of an underwater eruption in 726 CE. Through drilling and geochemical analyses, they found a layer of pumice and ash, up to 40 meters thick, linked to the eruption, challenging previous hypotheses about the volcanic system's behavior. These findings have significant implications for hazard assessment and highlight the need for greater attention to submarine eruptions.
Researchers have discovered bacteria living 1,250 meters underground in South Dakota's Black Hills that can convert carbon dioxide (CO2) into solid mineral crystals under extreme conditions. These extremophilic bacteria, including a Bacillus species, could potentially be used to capture greenhouse gases in depleted fossil fuel reserves. Lab experiments showed that the bacteria can produce calcite crystals from CO2 at 500 times greater pressure than at sea level and 80°C within 10 days. This discovery offers a promising avenue for carbon capture technology, although it should not replace the urgent need to reduce fossil fuel consumption.