| title: | Traces of Caledonian volcanism in Estonian and Baltoscandian sedimentary rocks and their use in correlation of geological sections, sedimentology and palaeogeography. |
|---|---|
| reg no: | ETF5921 |
| project type: | Estonian Science Foundation research grant |
| subject: |
1.10. Geology |
| status: | accepted |
| institution: | Institute of Geology at Tallinn Technical University |
| head of project: | Tarmo Kiipli |
| duration: | 01.01.2004 - 31.12.2006 |
| description: | The volcanic processes mark important events in the geologic history-breakdown of the lithospheric plates, moving, joining together and disappearing of continents. These processes have also been responsible for formation of the Estonian bedrock in Palaeozoic shelf sea. Purposes of the investigation are: To find out the volcanic ash layers in Ordovician and Silurian geological sections of Estonia, to identify their mineralogical and geochemical features. To correlate volcanic ash layers of Estonia. The one method for correlation bases on determination of Na-compound of effusive sanidine crystals by X-ray diffractometry. The other method bases on analyse of biotite composition by elemental microanalysator. To trace the development of lithofacies using fine-resolution correlations of volcanic ash layers. Spatial and temporal changes in lithology give information on basin seawater redox conditions, diagenetic processes, primary bioproductivity, eustasy, palaeogeography and climate. To correlate the Estonian volcanic ash layers with layers from neighbouring states using the correlation methods, worked out till now and developed further. To make the areal maps of thicknesses of volcanic ash layers for reconstructing the locations of ancient volcanoes. To elucidate the history of volcanism around Baltica palaeocontinent on the basis of mineralogical and geochemical data presumes geochemical analysis of immobile trace elements, effusive fenocrystals, using data on volcanic ash distribution find out the layers coming from one certain volcano, find out the number of different volcanoes and stratigraphic interval of action. To link the history of volcanism with the drift of continents and palaeogeography. To investigate the early diagenesis of volcanic ash. The relationships between volcanic ash, host rock and ancient seawater on the basis of geochemical and mineralogical investigations will be elucidated. To make database on samples from the volcanic ash layers and their analyses, and connect it with the database of geological collections of the Geological Institute of TTU. |
| project group | ||||
|---|---|---|---|---|
| no | name | institution | position | |
| 1. | Toivo Kallaste | TTÜ Geoloogia Instituut | teadur | |
| 2. | Enli Kiipli | TTÜ Geoloogia Instituut | teadur | |
| 3. | Tarmo Kiipli | Institute of Geology at Tallinn Technical University | scientist | |
| 4. | Ülo Sõstra | Tallinn Technical University | dotsent | |