Foreing collaboration of the joint project “Geological studies for correlation of sedimentation and volcanic cycles in the Early Proterozoic complexes of Fennoscandia”

23.10.2014

Joint studies with specialists of the Geological Survey of Norway, University of St.Andrews, Scotland/UK, and the Geology Department of the Institute of the Environment and Earth Sciences, Tartu University, were held under the joint geological research programme “Geological studies for correlation of sedimentation and volcanic cycles in the Early Proterozoic complexes of Fennoscandia” in the Onega structure, including the study of core samples from a superdeep borehole (village of Novinka) in the Central Core Storage in Petrozavodsk.    

From 3 through 10 October, 2014 the Institute of Geology hosted Anthony Prave, Director for Research; Mark Claire, a scientist; Aubrey Zerkle, a teacher of the Department of the Environ-ment of Earth Sciences, University of St.Andrews, Scotland/UK; Aivo Lepland, a scientist, Geolog-ical Survey of Norway, Trondheim; and five persons from Tartu University, Estonia: Kalle Kirsimäe, Professor of Geology and Mineralogy, Geology Department, Institute of the Environment and Earth Sciences; Timmu Kreitsmann, post-graduate/scientist; Sigrid Soomer, MSc student/laboratory assistant; Kärt Üpraus, post-graduate/scientist; and Käärel Mänd, MSc student/laboratory assistant.

The programme began with the geological field trip Medvezhyegorsk-Tolvuja-Medvezhyegorsk. The scientists examined coastal mottled marl (krivozerite) exposures of the Trans-Onega suite and dolomite exposures of the Tulomozero suite in Svyatukha Bay and visited a shungite adit in the Town of Shunga. The trip continued in the Zazhogino and Maksovo shungite quarries. Lyddite and dolomite outcrops at Tetyugino locality and shiungite-dolerite relationship at Lebeshchina locality were then demonstrated.

The second geological trip, Medvezhyegorsk-Luzhma River-Medvezhyegorsk, was then ar-ranged. The scientists were shown the granitic conglomerates of the Palyeozero suite, the quartz conglomerates and quartzitic sandstone of the Yangozero suite and the mafic igneous rocks of the Medvezyegorsk suite near the Town of Padun. The carbonate rock exposures of the Tulomozero suite and a dolerite sill in a roadcut near the bridge across the River Kumsa were examined. The scientists then examined coastal hematitized amygdaloidal basalt exposures of the Medvezhyegorsk suite and the red-coloured siltstones and sandstones of the lower Tulomozero suite in Kyulmas Bay. Diamictites, varved clay and a contact between metamorphosed varves and Yangozero quartz con-glomerates in the Luzhma River basin were shown.

The third geological field trip, Medvezhyegorsk-Petrozavodsk, was then offered. Roadcuts at the southern boundary of Medvezhyegorsk, where Archean basement plagiogranites are in con-tact with Palyeozero granitic conglomerates (diamictites, dropstones), were examined. Also demon-strated were variolitic- and amygdaloidal-structured andesite-basalt flows and Kumsa quartzitic sandstones were demonstrated. Near the Town of Girvas, the guides drew the attention of the group to a reduced column of the Tulomozero suite in the Lukanoja Creek valley, the pattern of the contact of the rocks with underlying hematitized amygdaloidal basalts (Medvezhyegorsk suite) and a gently-cutting dolerite sill. The visitors examined evaporite-structured dolomite outcrops and stromatolitic buildups (Tulomozero suite) on the west shore of Lake Sundozero and a contact zone between Tulomozero red-coloured dolomites and grey siltstones (Trans-Onega suite) in Ruoka Bay. The trip was guided by P.V.Medvedev, a senior scientist.

 

 

Core samples from the Onega Parametric Borehole were then examined in the Central Core Storage near the Heat Power Plant. Comments were given by Senor Scientist P.V.Medvedev, Senior Scientist D.V.Rychanchik and Scientist A.E.Romashkin of the Institute of Geology. In the Central Core Storage the visitors met with 4th-year students of the Geology and Geophysics Department and Head of the Geology and Geophysics Department Prof.V.V.Shchiptsov. Anthony Prave, Kalle Källe Kirsimäe and Aivo Lepland introduced the group, described the goals of the joint research and answered a few questions from the students.

On 10 October the visitors attended a geological seminar in the Institute of Geology. Antho-ny Prave made the presentatio "A revised view of Palaeoproterozoic Earth history" and Aivo Lepland gave the talk "Fossilization by phosphatization 2 Ga ago, Zaonega Formation" . Both presentations were interpreted by G.N.Sokolov, Leading Translator/Interpreter, Institute of Geology staff member.

 

 

The group also visited the Museum of Precambrian Geology.

After the seminar the results of the joint work were summarized. The scientists stated that the programme was completely fulfilled. A good basis for further contacts under the programme was thus provided. It was stressed that relations can be developed in education, e.g. student ex-change, etc. Mutual trust and a great interest in scientific contacts were maintained throughout the entire visit. Anthony Prave, Källe Kirsimäe and Aivo Lepland thanked the Russian hosts for the well-organized trip, the warm welcome, the comfortable conditions and the hospitality of the Rus-sian scientists.