Geochemistry, Mineralogy, Petrology & Volcanology

Imaggeo On Monday: Križna jama

Peter Huber January 24, 2022

Križna jama . Credit: Peter Huber (distributed via imaggeo.egu.eu)

The Križna jama Cave on the east side of the periodic Cerknica Lake in Slovenia is an underground karstic cave primarily famous as a rich site of bones of the extinct cave bear, Ursus speleus. The eight kilometer long cave is full of stalagmites and stalactites (sometimes called drip-stone decorations) and also boasts 50 underground lakes separated by sinter barriers through which crystal clear wa ...[Read More]

Congratulations to the winners of the EGU Best Blog Posts of 2021

Gillian D'Souza January 21, 2022

At EGU, we like to believe that a new year is more meaningful when we pause to look back at the year gone by – just a brief glimpse to appreciate all our good work and progress! 2021 was certainly an excellent year for our blogging network at EGU. Across the EGU’s official blog, GeoLog and division blogs we had so many inspiring, thought-provoking and even entertaining posts this year. Thank you t ...[Read More]

Imaggeo On Monday: Quartz – sericite mylonite, Calamita, Elba

Samuele Papeschi January 17, 2022

Quartz - sericite mylonite, Calamita, Elba . Credit: Samuele Papeschi (distributed via imaggeo.egu.eu)

Concomitant thrusting and magmatism resulted in the development of ductile mylonites in the Calamita Schists, part of the contact aureole of the Late Miocene Porto Azzurro pluton. This mylonite is made up of stretched and recrystallized quartz layers, interlayered with thin sericite-rich levels. Sericite resulted from the crushing of contact-metamorphic minerals such as andalusite, cordierite, and ...[Read More]

Imaggeo On Monday: Artificial peridotite takes its gold coat off

Thomas P. Ferrand January 10, 2022

Artificial peridotite takes its gold coat off . Credit: Thomas P. Ferrand (distributed via imaggeo.egu.eu)

Sometimes in order to test a theory about how processes work below the surface of the Earth, scientists need to recreate minerals found in very specific circumstances. This photograph was taken through a binocular microscope during a critical step of the creation of artificial peridotite: extraction of the artificial peridotite from its gold capsule. The sample is a little cylinder, 3 mm long with ...[Read More]