Teaching, research interests, thesis topics · Geothermics Lithosphere Structure and Dynamics Field...
Transcript of Teaching, research interests, thesis topics · Geothermics Lithosphere Structure and Dynamics Field...
Geo2 Study track: Solid Earth Geophysics
Teaching, research interests, thesis topics
Ilmo KukkonenGeoscience Dept. Seminar
17.11.2017
Teaching
You’ll meet me at least on these courses:
Introduction to Solid Earth Geophysics
Geothermics
Lithosphere Structure and Dynamics
Field course of Solid Earth Geophysics
Borehole Geophysics
17.11.2017
Research interests?
• Heat transfer in the Earth
• Deep drilling projects
• Applying physics in geological problems
• Thermal evolution of the Fennoscandianlithosphere
• When and how did the Fennoscandian Shieldbecome a ’shield’?
17.11.2017
Research I’m currently involved in …
Geothermics and geothermal energy:Deep geothermal drilling in Espoo Heat flow and heat production in FennoscandiaHeat flow and seismicity in FennoscandiaGeoneutrinos: modeling lithospheric heat production
Thermal properties of rocks and nuclear waste disposal:Lab and in situ measurements of rock thermal properties in Olkiluoto
Hydrothermal alteration and reflection seismic properties of rocksPetrophysics and petrology combined
Low temperature thermochronology in FinlandDeep boreholes in Outokumpu and Espoo
Thesis topics…
17.11.2017
Master’s thesis
Solid earth geophysics
17.11.2017
Lithology and
structures of bedrock
in the Otaniemi deep
boreholes
Geological and/or
geophysical work on the
samples from OTN
boreholes 2 – 7 km
(industry supported)
Ilmo Kukkonen
Deep drilling
OTN-1 2015 m
OTN-2 (now 3300 m)
OTN-3 (now 5385 m)
Preliminary title Notes Contact
Heat transfer in rocks :
Heat and mass transfer
in coaxial drill hole
casings for geothermal
energy applications
Theoretical modeling
work on heat transfer
(industry supported)
Ilmo Kukkonen
Inverse solution of
conductive heat transfer
in 3D anisotropic
medium
Theoretical modeling
related to waste disposal
(industry supported)
Ilmo Kukkonen
Preliminary title Notes Contact
17.11.2017
17.11.2017
Heat transfer in a coaxial borehole casing• Application in geothermal energy use• Down-flowing water heats up• But up-flowing water cools down• Optimizing flow rate, heat transfer and casing materials• Numerical modeling (Comsol Multiphysics)
Figures on analyticalsolutions adapted fromEricsson 1985
Processing and analysis
of seismic reflection
data in exploration and
mining camps
Seismic data processing:
Several case histories
available
Emilia Koivisto
Ilmo Kukkonen
Hydrothermally altered
mineralized systems:
Seismic reflection
properties of rocks
Experimental and
theoretical study
(includes both
geophysics and geology)
Ilmo Kukkonen
Emilia Koivisto
Reflection seismics :
Preliminary title Notes Contact
17.11.2017
Hannukainen: FeOx-Cu-Au depositD
epth
(m
)
Previously mined skarn /amphibolite layer with semimassive magnetite
Unknown skarn/amphibolitelayers?
Hannukainenopen pit
[Adapted from Kukkonen et al., 2009]17.11.2017
Hydrothermally altered mineralized systems: Seismic reflection properties of rocks, Kevitsa Ni-Cu-PGE deposit
• Reflectivity depends on velocity and density
• Alteration: e.g., formation of secondaryamphibole, epidote, serpentine, sulfides
• How does alteration change the reflectionproperties?
• Kevitsa: The mineralization is related to host-rock contamination (incl. alteration)
• Sulphides alone are not sufficient to produce reflectivity
[Junno et al., 2017, under review]
17.11.2017
Cosmogenic isotopes in
age dating of glacial
bedrock morphology
Initiating application
of an age dating
method so far not
used in Finland
Ilmo Kukkonen
David Whipp
Seija Kultti
Low temperature
thermochronology:
Fission track & He-U-Th-
methods
Studying the methods
in theory and practice
David Whipp
Ilmo Kukkonen
Modeling of
thermochronological data
Thermal modeling
with existing and new
software
David Whipp
Ilmo Kukkonen
Low temperature thermochronology:
Preliminary title Notes Contact
17.11.2017
Apatite fission track ages in Fennoscandia• Time BP when the bedrock surface cooled below 60-110°C• When did the shield become a shield?
Hendriks et al., 200717.11.2017
Compilation of thermochronological data in Fennoscandia (Finland)
Monte Carlo inversions based on tracklength distributions and paleotemperatures
Features• Cooling from orogenic events ̴1500 Ma• Cambrian peneplain ̴600 Ma• Early Paleozoic reheating ̴400 Ma• Reheating at ̴100 Ma (?)
• The shield was exposed already in theCambrian (?)
• New sedimentation in the Paleozoic (?)• Last phase of exhumation was quite
recent (< 100 Ma) (?)
Murrell (2003)
Tem
per
ture
Tem
per
ture
Time
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Radiogenic heat
production model of the
lithosphere based on
geochemistry and seismic
data
Modeling based on
radiogenic heat
production data and
wide-angle seismic
profiles in Finland
Ilmo Kukkonen
Toni Veikkolainen
Geoneutrinos and
radiogenic heat
production of the Earth
Detection estimation
of geoneutrinos in the
Pyhäsalmi case
Ilmo Kukkonen
Toni Veikkolainen
U-Th-K geophysics and geochemistry: Radiogenic heat production
Preliminary title Notes Contact
17.11.2017
Radiogenic heatproduction in Finland
• Basic facts: HP is a primary factorcontrolling crustal temperatures/ HP tells the story of chemicaldifferentiation of the earth
• In the map, HP was calculated from U, Th, K data on outcrops
• How does heat production vary withdepth?
• How to estimate the lithospheric heatproduction from surface to uppermantle?
Veikkolainen and Kukkonen, 2017 (in prep.)
μW m-3
Kiitos kuulijoille!
Ilmo Kukkonen 14.11.2017
Thanks for your attention!Questions?