Hanna Leväniemi

Hanna Leväniemi
Geological Survey of Finland | GTK · Mineral Economy Solutions

MSc

About

25
Publications
12,141
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
205
Citations
Additional affiliations
May 2001 - present
Geological Survey of Finland
Position
  • Geophysicist

Publications

Publications (25)
Article
The XSoDEx (eXperiment of Sodankylä Deep Exploration) project acquired in total 82 km of seismic reflection and refraction data to improve the understanding of the crustal composition and, consequently, the mineral systems of the Sodankylä region in Northern Finland. The Sodankylä region is part of the Central Lapland Greenstone belt, which is famo...
Conference Paper
As part of a recent mineral system study in the Metsämonttu–Aijala region in southern Finland, the Geological Survey of Finland (GTK) acquired an uncrewed aerial vehicle (UAV) magnetic survey to enhance geological interpretation of the area. The survey was conducted on a 25 km² are with 25 m line spacing. The data helped outline new bedrock observa...
Article
Full-text available
In mineral exploration, reliable and comprehensive petrophysical groundwork helps evaluate the success rate of applying geophysical methods to the target and thus improves the quality of decision making related to geophysical surveys. Petrophysical data for potential field exploration can be efficiently collected from drill cores together with port...
Article
Full-text available
We characterise the geochemistry, zircon Lu-Hf composition, age and the structure of the Uunimäki gabbro (UGB) in south-western Finland to improve the understanding of i) the early Svecofennian (1.92–1.89 Ga) crustal evolution of the central Fennoscandian Shield, ii) the potential role of rift-related magmatism for the build-up of the Paleoproteroz...
Article
Full-text available
The geodynamic system of Earth is controlled by the horizontal motion of fragmented tectonic plates due to complex interaction between the mantle and the crust. Land and marine paleomagnetic signatures, along with extensive petrochronological and structural data, suggest non-continuous, multi-directional convergence histories for modern orogenic be...
Technical Report
Full-text available
Exploration Lapland 3D (XL3D) project generated a scalable workflow for data mining and data integration with emphasis on extracting the critical parameters of different mineral systems. The aim was to improve the efficiency of data handling and geomodelling in situations where vast data sets of various types are available. The XL3D project tested...
Poster
Full-text available
Exploration Lapland (XL3D) 2018-2020 project focuses on how to utilize digital geoscientific datasets the best possible way for research and exploration. The project utilizes the data collected during the recent collaboration in the Experiment of Sodankylä Deep Exploration (XSODEX) project between Geological Survey of Finland (GTK), University of O...
Conference Paper
Full-text available
The magnetic properties of two mineralisation in the Vihanti region, western Finland, are studied. The study area is part of the 1.92–1.93 Ga Vihanti-Pyhäsalmi Belt that contains the most important volcanogenic massive sulphide deposits in Finland. The two mineralisations presented in this study, Lampinsaari and Kuuhkamo, show on aeromagnetic maps...
Article
This study investigated gold prospectivity in the Paleoproterozoic Häme Belt, located in southwestern Finland. The Häme Belt comprises calc-alkaline and tholeitic volcanic rocks, migmatites, granitoids, and mafic to ultramafic intrusions. Mineral exploration in the region has resulted in the discovery of several gold occurrences during recent decad...
Article
Full-text available
Electromagnetic (EM) methods have been widely used over decades in mineral exploration of the Outokumpu ore belt in Eastern Finland. This paper describes a frequency-domain electromagnetic Sampo Gefinex 400S survey carried out in 2014 at Perttilahti, and reviews the older Sampo datasets of Miihkali and Kylylahti. At Perttilahti, there is ca. 2-km-l...
Technical Report
Full-text available
Airborne geophysical surveys cover the whole of Finland and offer high-resolution magnetic, radiometric and electromagnetic datasets for various geo-scientific applications. This short ‘user guide’ provides background methodology, or ‘tips and tools’, to improve the extraction of geological information from the multivariate airborne geophysical dat...
Technical Report
Full-text available
The Wiborg rapakivi batholith has recently been under tentative studies by GTK for its potential for REE mineralizations. As one step of the studies the GTK airborne geophysical datasets were reprocessed to provide more detailed and customized geophysical maps.
Technical Report
Full-text available
Nikkelipotentiaali, peridotiitti, nikkeli, fosfori, potentiaalikartoitus, litogeokemia, geofysiikka, prospektiivisuusmallinnus
Article
Full-text available
A network ofhigh resolution seismic reflection profiles was acquired in Outokumpu, Finland. Outokumpu is one of the most important mining regions in Finland where active sulphide exploration is ongoing. Over 5 km long spread with 402 active channels and nominal vibroseismic source point interval of 25 m guarantee high fold and good signal-to-noise...
Technical Report
Full-text available
The Somero-Tammela area is one of the best known lithium pegmatite regions in Finland. This study investigates the possibility to model the prospectivity for the pegmatites using regional geophysical and topographic datasets. As the pegmatites are usually non-responsive for geophysical methods and thus the nature of relationship between a dataset a...
Article
Full-text available
Nationwide airborne geophysical surveys undertaken by the Geological Survey of Finland (GTK) were completed in 2007 and altogether covered about 1.90 million line kilometres. Magnetic, radiometric and multi-frequency EM survey data were systematically acquired at 200 m line spacing and 30 m nominal terrain clearance, along north-south or east-west...
Article
This study considers a specific issue, often termed the canopy effect that relates to our ability to provide accurate conductivity models from airborne electromagnetic (AEM) data. The central issue is one of the correct determination of sensor height(s) above the ground surface (terrain clearance) to the appropriate accuracy. The present study uses...
Article
This paper describes the airborne electromagnetic (AEM) system operated by the Joint Airborne geoscience Capability (JAC), a partnership between the Finnish and British Geological Surveys. The system is a component of a 3-in-1, fixed-wing facility acquiring magnetic gradiometer and full spectrum radiometric data alongside the wing-tip, frequency-do...
Article
This paper describes an airborne geophysical survey of Northern Ireland that is being conducted over a two year period. Measurements from a fixed-wing aircraft operating at 56 m include magnetic (gradiometer), radiometric and frequency-domain electromagnetic. The survey will complete over 80,000 linekm of coverage in the summer of 2006. The Phase 1...
Article
Geological Survey of Finland (GTK) and British Geological Survey (BGS) have jointly (JAC) constructed a new, 4-frequency EM unit installed in a fixed-wing aircraft. The system follows the technique of the previous dual frequency unit of GTK. The frequence range is now from 0,9 to 25 kHz. The four separate coils are installed inside the pods situate...
Article
Full-text available
39 figures, 6 tables and 7 appendices. The airborne geophysical system of the Geological Survey of Finland (GTK) has been in operation and active development for the last half century. GTK's expertise and ingenuity is demonstrated by its "three-in-one" concept, which showcases many of GTK's own areas of expertise. This paper describes the whole air...

Network

Cited By