Winning photos of the 2015 EAG Photo Contest
Find out more about the winning photos in the special blog post: “The story behind the winning photos“.
Theme: what is geochemistry for you?
The Tower of Chalk. Geochemistry for me, is the ability to explore a tiny piece of chalk, and in it find a unique monument to natures beauty and complexity. This photo was taken by me, Kim Dalby and Reza Gooya at the university of Copenhagen in the NanoGeo group. It shows an unknown tower-like form of cocolith, approximately 10 micro meters in Height. Photo by Anton Bischoff.
Theme: Earth, Fire, Air, Water
The beauty of disequilibrium. This is a picture of fast hydrothermal erosion and geochemical separation of elements, resulting in colourful patterns at Papandayan volcano (Java, Indonesia). Volcanic sulphur oxidises upon contact with air saturated groundwater to form a sulphuric acid with pH less than 1. This acid solution reacts with the surrounding hydrothermal breccias to form kaolinitic clays, thereby dissolving the rock´s chemical components. FeO will quickly become pyrite (black in the image) which in turn oxidises to FeO(OH) (orange in image) and sulfate. More soluble elements such as Na, K, Ca, Mg and Al dissolve and are flushed away by the stream, but where the acid water wets the rocks above water level and evaporates, these elements are precipitated into alums and other salts (white in image). Silica initially also dissolves into the acid water but is precipitated upon changes in water temperature and pH (grey in image). Photo by Ingrid Smet.
Winning photos of the 2014 EAG Photo Contest
Find out more about the winning photos in the special blog post: “From the winners of the EAG Photo Contest 2014“.
Theme: The changing world: geochemistry in action
Destructive beauty. Epsomite crystals formed during the alteration of a concrete wall by sulfate attack induced by the upward groundwater flow. Photo by César Menor-Salván.
Theme: Geochemistry and life
Bacteria vs mineral. Morning Glory Pool at Yelloswtone (May 2005). Photo by Olivier Pourret.
Theme: Geochemistry in a test tube
Twin. The growth of crystals in gel is a laboratory model useful to study the formation of mineral phases. In the picture, twinned gypsum crystals (5 mm) growth by slow diffusion of sulfate and calcium ions during one week in silica gel. Photo by César Menor-Salván.
The jury has selected “Destructive beauty” as the overall winning photo, therefore it was published in the EAG society pages of the December issue of Elements Magazine.