n the past, massive magma eruptions have led to the creation of large floods of basalt lava on the continents. It was previously believed that these types of eruptions could only occur in areas where the continental tectonic plates are thin, allowing deep mantle material to rise close to the surface
“The idea that flood basalt eruptions generally require melting of the mantle under low-pressure conditions is largely based on the trace element compositions of the erupted magmas”, explains Dr. Jussi Heinonen, University of Helsinki, the lead author of the recentHe specifies further that the relative amounts of rare earth elements in many flood basalts point to magma formation in the presence of low-pressure mantle minerals.
“We became curious about the occurrence of most flood basalts in regions where the African and Antarctic tectonic plates are thick rather than thin”, describes Dr. Arto Luttinen, leader of the University of Helsinki team. “Moreover, we found that many flood basalts that have rare earth element compositions, suggesting high-pressure formation conditions, are actually located in thin regions of the tectonic plates.
“These flood basalts made us consider the possibility that melting of exceptionally hot mantle could lead to the formation of high-pressure magmas with trace element features similar to those of low-pressure magmas”, adds Ph.D. student Sanni Turunen from the University of Helsinki. “We were thrilled to find out that the simulations supported our hypothesis by predicting total consumption of garnet, a diagnostic mineral of high-pressure conditions when mantle melting occurred at the high temperatures indicated by the flood basalts”, says Dr. Eric Brown,Magmas formed at high pressure can thus chemically resemble low-pressure magmas when the mantle source is very hot.
Brasil Últimas Notícias, Brasil Manchetes
Similar News:Você também pode ler notícias semelhantes a esta que coletamos de outras fontes de notícias.
Defying Conventional Theories: How Does Radiation Travel Through Dense Plasma?First-of-its-kind experimental evidence contradicts traditional theories about the emission and absorption of radiation by plasmas. While solids, liquids, and gases are familiar states of matter, there is a fourth state called plasmas which is the most common form of matter in the universe. It can
Consulte Mais informação »
How to unlock your creativity – even if you see yourself as a conventional thinkerDo you think that creativity is an innate gift? Think again. New research highlights how anyone can train their creative muscles by rethinking the anxiety, frustration and anger they encounter in daily life.
Consulte Mais informação »
Most people who ended up with long COVID started with a mild case, new study showsThe researchers found 'a staggering' 90% of people living with long COVID only had a mild illness to start \u2014\u00a0but people who were hospitalized were more likely to develop the lasting symptoms.
Consulte Mais informação »
Letter About Patient's Fatal Overdose Lowers Opioid Prescribing'Dear Doctor' letters reduce opioid scripts up to a year after receipt, a new study found.
Consulte Mais informação »
New Study Uncovers Surprising Connection Between Evolution and DiscriminationA research paper suggests that it is more effective to create environments that encourage the emergence of desired behavior through evolutionary dynamics, rather than simply trying to regulate against undesired outcomes. According to a new study published in the inaugural issue of the journal Col
Consulte Mais informação »
New Study Offers Details on Post-COVID Pediatric IllnessThis pediatric illness occurs 2 to 6 weeks after being infected with COVID-19.
Consulte Mais informação »