6.9.2019

Science Blog: Acid rock drainage prediction by SEM mineralogy

Teksti:
Teemu Karlsson, Geologist

GTK has a long history in mining environmental investigation. A recently published study (Karlsson et al. 2018) examined the use of SEM mineralogy in acid rock drainage (ARD) prediction. The results were promising and indicate that mineralogical calculation can be an efficient tool in mine drainage quality assessment. ARD with high concentrations of harmful elements […]

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7.5.2019

Science Blog: Ancient Supercontinents in East Antarctica – Africa Border Zone Revealed by Xenoliths from Vestfjella

Teksti:
Ilona Romu, Geologist

Exploration and research in the remote and long inaccessible Arctic and Antarctic regions became possible at the late era of sailing vessels. In the western Dronning Maud Land of East Antarctica, Vestfjella, known also as the Kraul Mountains, was first listed on the map in the 1930s and some of the first printed geological notes […]

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1.4.2019

Science Blog: Microstructural and 3D X-ray Tomographic Study of the High-purity Quartz (HPQ): Examples from Finland

Teksti:
Thair Al-Ani, Senior Scientist

High purity quartz is one of the primary strategic raw materials in the manufacture of semiconductors, high- temperature lamp tubing, optics, telecommunication and electronic devices, and solar silicon applications (Haus 2010; Moore 2005; Dal Martello et al. 2011a, b). The Geological Survey of Finland (GTK) has been active in locating potential deposits of high-purity quartz […]

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11.3.2019

Science Blog: Reflections from the project COGITO-MIN

Teksti:
Suvi Heinonen, Senior Scientist

August 2016, I was driving from Helsinki towards Polvijärvi with anticipation. I was being followed by  groups from the University of Helsinki, the Institute of Geophysics Polish Academy of Sciences, Vibrometric Oy and Geopartner Ltd., with seismic equipment worth millions of Euros. We all had a common goal: to acquire multiple high-quality seismic data sets […]

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12.2.2019

Science Blog: Cross-border cooperation for proper storm water handling

Teksti:
Johannes Klein, Senior Scientist

Storm water management is a subject now high on the agendas of many cities in Northern Europe. Two major phenomena drive the need for improvement in storm water management and the search for alternative approaches; the expectation of more heavy downpours and an ever-increasing amount of sealed surface. Combined, these two factors can cause sewage […]

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4.2.2019

Science Blog: Estimating the lithium resources of Finland

Teksti:
Kalevi Rasilainen, Geologist

The Geological Survey of Finland (GTK) has been carrying out assessments of undiscovered mineral resources in the Finnish bedrock since 2008. As a part of this process, the lithium resources hosted by undiscovered lithium–caesium–tantalum (LCT) pegmatite deposits were estimated down to the depth of one kilometre in 2018. Presently, the world’s dominant sources of lithium […]

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7.1.2019

Science Blog: The distribution of elements in peat

Teksti:
Teuvo Herranen, Geologist

The Geological Survey of Finland (GTK) has thus far studied 2.27 million ha of Finnish peatland. The peat data generated in peat mapping has been saved in a peat database maintained by GTK. The database contains data on over 17 900 peatlands, totalling more than 1.75 million study and depth points. Samples have been taken […]

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3.12.2018

Science Blog: Paleoproterozoic oroclines in Fennoscandia

Teksti:
Raimo Lahtinen, Research Professor

Oroclines, or curvatures of previously linear arcs (or belts), are tectonic structures that bridge the manufacture of arcs and formation of stable, equant continental blocks. Oroclines are well documented and spatially distributed on a global scale, and they form curved mountain belts of varying degrees in both young and ancient orogens. Johnston et al. (2013) […]

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6.11.2018

Science Blog: New constraints to the development of the Svecofennian orogeny

Teksti:
Perttu Mikkola, Geologist

The bedrock of Central Finland has a research history extending well back into the 19th century, and the overall evolution of the area is thus relatively well understood. Nevertheless, new data from previously poorly studied areas or the revisiting of areas studied decades ago bring new pieces to the Paleoproterozoic Svecofennian puzzle. Recently published studies […]

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1.10.2018

Science Blog: Photogrammetry in fracture mapping with the aid of an unmanned aerial vehicle (UAV)

Teksti:
Nicklas Nordbäck, Senior Specialist
Jussi Mattila, Senior Specialist
Jon Engström, Senior Specialist

The essential principle in photogrammetry is triangulation, a science that dates back to 1480 and to the invention of perspective and projective geometry by Leonardo da Vinci. By capturing photographs from at least two different locations, so-called “lines of sight” can be established from cameras to points on a photographed object. By mathematically intersecting these […]

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