Results of core samples petrographic study of the Siljan ring structure basement
UDC: 553.98(485):550.822.3+552.2
DOI: -
Authors:
SIVALNEVA O.V.
1,
KUTCHEROV V.G.2,
BUZILOV A.S.3,
POSTNIKOV A.V.1
1 National University of Oil and Gas "Gubkin University", Moscow, Russia
2 KTH Royal Institute of Technology, Stockholm, Sweden
3 PetroTrace LLC, Moscow, Russia
Keywords: ring structures, Siljan crater, basement rocks, core study, rock petrotypes, thin sections analysis
Annotation:
Among the large ring structures, generally regarded as meteorite (impact) craters, the Siljan Ring structure is one of the best-known in the central Sweden. The ambiguity of the evidence of the structure impact origin suggests that the processes that caused its formation were endogenous, for example, due to an explosion. Samples of basement rocks were collected and studied from four sections, penetrated by exploratory boreholes along the periphery of the Siljan crater. Based on the results of laboratory studies, detailed petrographic characteristics of the rocks were obtained, which included a description of their structural and textural specific features, mineral composition and secondary transformations. Significant differences of the rocks composition in the sections located in the eastern and western parts of the structure were revealed. In the western part boreholes exposed volcanic and metamorphosed volcanic-sedimentary rocks, while the section in the east part of the structure is composed by igneous rocks of predominantly acidic composition. It is probably caused by structural shifts due to the influence of intense tectonic processes.
Bibliography:
1. Donofrio R.R. North American impact structures hold giant field potential // Oil and Gas Journal. – 1998. – Vol. 96(19). – Pp. 69–80.
2. Neorganicheskoe proiskhozhdenie nefti: ot geologicheskoy k fizicheskoy teorii / V.A. Krayushkin, V.G. Kucherov, V.P. Klochko, P.F. Gozhik // Geologicheskiy zhurnal. – 2005. – № 2. – S. 35–43.
3. Earth Impact Database. University of New Brunswick [Elektronnyy resurs]. – Rezhim dostupa: http://www.passc.net/EarthImpactDatabase/New%20website_05-2018/Index.html (data obrashcheniya 30.09.2023 g.).
4. Osinski G.R., Ferrière L. Shatter cones: (Mis)understood? // Science Advances. – 2016. – Vol. 2(8). – DOI: 10.1126/sciadv.1600616
5. Gipoteza formirovaniya kol’tsevykh struktur platformennykh neftegazonosnykh provintsiy v rezul’tate gazovykh eksploziy / A.V. Postnikov, V.G. Kucherov, E.S. Iz"yurova [i dr.] // Trudy RGU nefti i gaza imeni I.M. Gubkina. – 2020. – № 1(298). – S. 17–28. – DOI: 10.33285/2073-9028-2020-1(298)-17-28
6. Concentric impact structures in the Palaeozoic of Sweden – the Lockne and Siljan craters / A.E.S. Högström, E. Sturkell, J.O.R. Ebbestad [et al.] // GFF. – 2010. – Vol. 132. – Pp. 65–70.
7. Pikovskiy Yu.I., Glasko M.P., Kucherov V.G. Blokovaya struktura i neftegazonosnost’ impaktnogo kratera Sil’yan // Geologiya i geofizika. – 2017. – № 2. – S. 243–249. – DOI: 10.15372/GiG20170205
8. Buzilov A.S., Postnikov A.V. Sil’yanskaya kol’tsevaya struktura – problemy formirovaniya i neftegazonosnosti // Trudy RGU nefti i gaza imeni I.M. Gubkina. – 2016. – № 4(285). – S. 5–14.
9. New Ordovician–Silurian drill cores from the Siljan impact structure in central Sweden: an integral part of the Swedish Deep Drilling Program / O. Lehnert, G. Meinhold, S.M. Bergström [et al.] // GFF. – 2012. – Vol. 134. – Pp. 87–98.
10. A new interpretation of the sedimentary cover in the western Siljan Ring area, central Sweden, based on seismic data / C. Juhlin, E. Sturkell, J.O.R. Ebbestad [et al.] // Tectonophysics. – 2012. – № 860. – Pp. 88–99.
11. Ordovician stratigraphy of the Stumsnäs 1 core from the southern part of the Siljan Ring, central Sweden / O. Lehnert, G. Meinhold, A. Arslan [et al.] // GFF. – 2013. – Vol. 135. – Pp. 204–212.
12. Kresten P. Geochemistry and tectonic setting of metavolcanics and granitoids from the Falun area, South-central Sweden // Geol. Föreningens Stockh. Förhandlingar. – 1986. – Vol. 107. – Pp. 275–285. – DOI:10.1080/11035898609453071
13. AlDahan A.A. Alteration and mass transfer in cataclasites and mylonites in 6,6 km of granitic crust at the Siljan impact structure, central Sweden // Contr. Miner. Pet. – 1990. – Vol. 105. – Pp. 662–676. – DOI: 10.1007/BF00306532
Back to issue