Diabase is often used for ornamental purposes due to its durability and aesthetic qualities such as this giant sphere in Southern Sweden. (Wikimedia, Pål Svensson)

Mineralisation Processes

The Earth is constantly being reshaped by the processes of creation, erosion and sedimentation. If looked at world-wide, there are two different types of “land”, usually dependent upon whether or not glaciation has been involved. Scandinavia, Russia, Canada and parts of Africa are vast shields of eroded bedrock whereas the rest of the world is…

Yellowstone caldera.

The shivering Yellowstone

This is just a brief little post on Yellowstone to make everyone happy that is based mainly on what GeoLurking wrote in the comment field on the previous post. First of all I would like to say that the activity behind yesterdays M4.8 earthquake is an ongoing process that has been running at least since…

A high-temperature hydrothermal vent in the Kolumbo submarine crater, discharging gases. Photograph from NOAAs expedition in 2006 in the Aegean Ocean.

Kolumbo Volcano – Theras younger brother

Kolumbo is an active submarine volcano in the Aegean Sea, about 300  7 km northeast of Cape Kolumbo, Santorini  Island.  It is the largest of a line of about twenty submarine volcanic cones extending to the northeast from Santorini.  It is about 3 km in diameter with a crater 1.5 km across.  Previous to the newly discovered Tamu Massif volcano in the northern…

Wikimedia commons

White Island – Whakaari

Mike Ross mentioned that hydrothermal activity on White Island is above normal scales. News Volcanic Alert Bulletin WI-2013/02 – White Island Volcano http://t.co/GX3JAEdu The volcano had shown some unrest last year, by chance (?) on the same day as Tongariro. Check …Eruptions at Tongariro & Whaakari (White Island) and 1 million viewers! Author Carl August 7th. Bruce Stout…