26. júní 2018

ÍSOR publishes a new geological map

ÍSOR has issued a new map entitled “Geological Map of the Eastern Volcanic Zone. Tungnaá area”. It is in the scale of 1: 100 000. The map features Hekla, Þjórsárdalur, Landmannalaugar, Veiðivötn, Langasjór, Jökulheimar, Eldgjá and Lakagígar.

This map is based on several previous maps by ÍSOR and its forerunner the National Energy Authority which were revised and redrawn using new data acquired in the field. The mapped area is characterized by hyaloclastite formations and postglacial lavas. Altogether about 80 lavas have been dated by tephrochronology. Main sites of hot springs are indicated, along with key tectonic features and the main deglaciation structures of the area.

On the reverse of the map are 24 selected sites with descriptions.

The map is compiled by the geologists Ingibjörg Kaldal, Árni Hjartarson, Kristján Sæmundsson, Magnús Á. Sigurgeirsson and Skúli Víkingsson. During the years of 1983-1999 the geologists Elsa G. Vilmundardóttir and Snorri P. Snorrason conducted fieldwork in the area with special emphasis on hyaloclastite formations. Elsa was working on a synopsis and a compilation map when she unexpectantly passed away in the spring of 2008, at the age of 75. Hyaloclastite is a generic name for volcanic formations formed during subglacial eruptions. Many different facies are recognized on their geological map, based on distribution and chemical composition.

Cartography by Albert Þorbergsson and Guðrún Sigríður Jónsdóttir.

The geological map received major support from Landsvirkjun and the Ministry of Environment and Natural Resources. 

Since 2010, ÍSOR has issued three geological maps of Iceland’s volcanic zones in the scale of 1: 100 000. This map is the fourth in the series. Other geology maps are:

In addition ÍSOR issued a geological map of Iceland in the scale of 1: 600,000 in 2014.

The maps are for sale in the bookstores Eymundsson and by Forlagið, as well as at information centres around the country. All these geological maps will be available on the geological web map of Iceland.