Articles tagged with Metamorphic Rocks
A Kobe University study finds that carbon-containing meteorites appear less shocked because gases produced during impacts are ejected into space, revealing a new understanding of shock metamorphism. The team's guidelines for future missions also predict the accumulation of highly-shocked material on dwarf planet Ceres.
Researchers explore subduction initiation process with varying geological records, proposing two contrasting regimes: hot and cold. High-temperature ophiolites and metamorphic sole are characteristic of hot subduction initiation, while cold subduction zones lack these records.
A recent study using synchrotron experiments found that elastic differential stress can develop mineral fabrics in rocks, even before irreversible strain accumulates. This challenges conventional knowledge that only differential stress is needed for fabric development. The research has implications for understanding the role of stress ...
A study suggests that river erosion can drive biodiversity in geologically quiet environments, such as the Appalachian Mountains. The research found that changing landscapes pushed a species of fish into different tributaries, leading to distinct genetic lineages.
Scientists have found microdiamonds in a Cretaceous metamorphic rock formation in Nagasaki Prefecture, Japan, revealing that the crust has penetrated deeper than 120 km. This discovery challenges previous assumptions about Japan's geology and suggests that the country was once involved in continental collision zones.
A new study of ancient rocks provides fresh insight into Earth's plate tectonics, which has evolved over the last 2.5 billion years. The findings challenge previous models suggesting plate tectonics operated throughout Earth's history.
Researchers propose alternative petrogenesis model for Archean trondhjemite, suggesting tonalitic rocks as primary source material. Simulations using quantitative phase modeling approach reveal comparable major and trace element compositions with trondhjemite rocks.
A HKU undergraduate student applied THMOCALC phase-equilibrium modeling technique to determine pressure-temperature conditions of Eastern Hebei mafic granulites. Her research yielded accurate results, reflecting an origin related to underplating of mantle-derived magmas.
Researchers pinpoint stress factor behind 2011 Tohoku-oki earthquake by analyzing geological rock formations offshore of Japan. The study provides new insights into the hazard potential of large earthquakes at subduction zones.
A new book by UC Santa Barbara geologist Arthur Sylvester explores the region's complex geology and notable features like the San Andreas Fault and Joshua Tree National Park. The guide includes 196 geo-referenced photographs, maps, and diagrams to help drivers appreciate the region's geological treasures.
Researchers found metallic lead nanospheres in 3.4 billion-year-old zircons from Antarctica, which could alter ages determined using high-resolution ion probe techniques. The inhomogeneous distribution of lead in zircon might falsify ages, highlighting the need for reevaluation of geological age determination methods.
Researchers have found that basin sediments recorded the formation process of the Dabie orogen, providing crucial information on subduction and rapid exhumation. The study suggests a gradual transition from shortening to extension during the Mesozoic era, with the depth of exhumation increasing eastwards.
Researchers found carbon-based minerals in ancient Canadian rocks to be millions of years younger than the rock itself, questioning earlier timelines for biological life's emergence. The discovery suggests that carbon may have been introduced into the rock at a later stage, potentially altering our understanding of the Earth's evolution.
New research on jade found in Guatemala's Motagua fault reveals two collision events between the North American and Caribbean plates. The study uses eclogite dating to pinpoint a 130 million-year-old collision, followed by a second event at 70 million years ago.
Yale researchers develop a hypothesis linking rock metamorphism and earthquake generation. They show that rapid release of water from rocks within fault zones can lead to high internal fluid pressures, decreased rock strength, and induced rock failure, potentially triggering repeated earthquakes.