Förslag till masterexamensarbeten
Här annonserar vi kontinuerligt nya förslag till examensarbeten på avancerad nivå (GEOR02, 45 hp). De senaste förslagen ligger överst och gamla tas bort efter hand som de blir inaktuella. Kontakta huvudhandledaren om du är intresserad. Du är dessutom alltid välkommen att utifrån dina egna intressen diskutera olika möjligheter med dina lärare. Här kan du se exempel på tidigare masterarbeten. Notera att du måste vara antagen till masterprogrammet i geologi vid Lunds universitet för att kunna genomföra ett av de föreslagna projekten.
A drainage event of ancient Lake Siljan at Åkerö in Leksand, Dalarna – a scenario test
The Siljan area, situated in the central part of Dalarna, south-central Sweden, is of remarkable geologic interest. Besides being the site of a major meteorite impact during the Devonian, the area displays a spectacular array of Quaternary sediments and landforms, and a complex deglaciation history. At the deglaciation the Ancylus Lake inundated the area, forming a highest shoreline in the southeast around Leksand at c. 205 m above present sea level (a.s.l.)., while the highest shore line in the northwesr formed at c. 220 m a.s.l. due to the differential isostatic uplift.
When the Siljan – Orsasjön lake basins became isolated from the Baltic it had an outflow (River Dalälven) through the now dry so-called ’Åkerö channel’, just south of Leksand at 168.5 m a.s.l., according to von Post (1934). von Post then argued that there was a later, more or less catastrophic relocation of the outlet around 6500 years ago, when Dalälven found a new route slightly to the north, the outlet of today, and the lake level fell by 5-6 m.
The MSc. project will be part of an ongoing project, see more information here, and will specifically test the drainage scenario described above. It will center on an infilled lake succession, c. 2 km south of the Åkerö channel. The project starts with field work coring this basin. The sediment sequence will be investigated stratigraphically by means of lithological description, magnetic susceptibility and XRF analysis for identification of the level of the drainage event. However, the exact methodology may be subject to some modification following core retrieval. The sediments will also be dated by radiocarbon for comparison of a possible isolation age estimate with data that we have already obtained from a sediment record in the nearby Åkerö channel.
Handledare: Per Möller, Dan Hammarlund och Karl Ljung
Solar storms in a paleoperspective
The recent discovery of abrupt short-term radionuclide production rate increases received considerable attention since they can be related to enormous solar storms (see e.g. https://www.iflscience.com/space/traces-giant-solar-storms-found/ ). Such an event could have devastating effects on our technological infrastructure today. Significant efforts are nowadays focusing on high-resolution (annual) 14C measurements in tree rings to identify more of such events. However, ice core 10Be and 36Cl records have the potential to (i) increase the possibility for more reliable detection of such strong solar storm events and (ii) characterise such events in terms of number of particles and energy.
The master thesis will focus on the investigation of potential new solar storm events. It will likely involve ice core sampling at the ice core storage in Copenhagen and it will involve 10Be and 36Cl sample preparation at Lund University. The analysis will include an assessment of the likelihood of the identification of new solar storm event and an assessment of its characteristics.
Handledare: Raimund Muscheler, Florian Mekhaldi