GeoLog

Geochemistry, Mineralogy, Petrology & Volcanology

The ancient art and science of mining: a look back at the 1500s

July 1, 2022
The ancient art and science of mining: a look back at the 1500s
Credit: Luca Tinagli (from imaggeo.egu.eu)

Sean Daly is a (now retired) Canadian mining geologist with 40+ years of experience, who has dedicated his career to understanding the close relationship between mining, geology and society. His recent book “From the Erzgebirge to Potosi: ​A History of Geology and Mining Since the 1500’s” traces the history of mining and geology from the 1500’s including the Renaissance, the Industrial ...[Read More]

Imaggeo On Monday: The Heart of a Stone

February 14, 2022
Imaggeo On Monday: The Heart of a Stone
The Heart of a Stone. Credit: Bernardo Cesare (distributed via imaggeo.egu.eu)

Heart-shaped glomerocryst (aggregate of phenocrysts) made of plagioclase and pyroxene in a cordierite-bearing dacitic lava from Lipari (Eolie Islands). I study the crustal xenoliths of these lavas to understand the processes accompanying high-temperature metamorphism and crustal melting. But I came across this spectacular glomerocryst and couldn’t help but take a picture! Polarized light pho ...[Read More]

Imaggeo On Monday: Salt marsh in El Rocío (Huelva, SW Spain)

February 7, 2022
Imaggeo On Monday: Salt marsh in El Rocío (Huelva, SW Spain)
Salt marsh in El Rocío (Huelva, SW Spain). Credit: Antonio Jordán (distributed via imaggeo.egu.eu)

The coast line of Huelva is furrowed by wetlands and sprinkled with salt flats. These areas are a sanctuary for wildlife and are visited by migrating birds travelling between Europe and Africa. In these wetlands grow the salt cedar, the Phoenician juniper, the mastic tree, the Montpellier cistus, the rockrose, the kermes oak, rosemary, cordgrass, reeds and bulrushes. The picture shows part of the ...[Read More]

Imaggeo On Monday: Intriguing artwork by heat-loving microbes

January 31, 2022
Imaggeo On Monday: Intriguing artwork by heat-loving microbes
Intriguing artwork by heat-loving microbes . Credit: Julia Miloczki (distributed via imaggeo.egu.eu)

The geothermal area Sol de Mañana is part of the Altiplano–Puna volcanic complex shared between Bolivia and Chile. The area is characterized by volcanic activity and the sulphur springs host mud lakes and steam pools. The different colours stem from thermophilic, hyperthermophilic and acidophilic bacteria that colonize areas of varying temperatures.   Description by Julia Miloczki, after the ...[Read More]