Oru kihistik
ingl. k. Oru Member
| Tüüp ja tase | regionaalne litostratigraafia (kihistik) |
|---|---|
| Staatus | kinnitatud standard |
| ESK kinnitatud | Jah |
| Autor | Erisalu, E. (1965) |
| Indeks | EgdO |
| Indeks | V2gdO |
| Nime päritolu | Oru 315 puurauk, Ida-Virumaal (=Voka 315 puurauk) |
| Kuulub | Gdovi kihistu |
| Suhteline vanus | Kotlini lade |
| Litoloogia | Punased eriteralised (savikad-liivakad-gravelliitsed) terrigeensed kivimid |
| eMaapõu ID | 557 |
Stratotüübid
neostratotüüp: Meriküla F-169 puurauk (205.30..206.00 m) | Mens, 1992 (comp) |
hüpostratotüüp: Venevere 500 puurauk, Lääne-Virumaa (321.60..322.80 m) | Mens, 1992 (comp) |
holostratotüüp: Voka 315 puurauk (217.20..217.80 m) | Mens, 1992 (comp) | südamik hävinud tulekahjus 1969; core not preserved
Kirjeldus
From Mens, K., & Pirrus, E. (1997). Vendian. In Geology and mineral resources of Estonia (pp. 35–38). Estonian Academy Publishers:
The Oru Member occurs locally in the base of the Gdov Formation. It accumulated in depressions of the crystalline basement on account of its weathering crust. The greatest thickness of the Oru Member (6.7 m) has been recorded in the Jaama borehole. The member consists of red unsorted clayey-sandy-gravely deposits (mixtite). Unlike the overlying members, the deposits of the Oru Member differ both structurally and mineralogically. Quartz is the prevailing mineral in sand and gravel (up to 90%); its grains are angular or subangular with nonsorted size distribution. Feldspar is not common (less than 10%). The clayey matrix consists mostly of kaolinite. All this suggests that these deposits were formed in deluvial fans as a result of intense weathering of acid crystalline rocks.
Viited
Meidla, T. 2017. Ediacaran and Cambrian stratigraphy in Estonia: an updated review. Estonian Journal of Earth Sciences 66(3), p. 152–160. https://doi.org/10.3176/earth.2017.12 PDF
Mens, K., Pirrus, E. 1997. Vendian. Geology and mineral resources of Estonia. Estonian Academy Publishers, Tallinn. p. 35-38. | Sisu: Ülevaade |
Mens, K. (comp.) 1992. Каталог стратотипов венда и кембрия Прибалтики [Catalogue of Vendian and Cambrian stratotypes of the East Baltic areas]. p. 1-25. PDF | Sisu: näidatud stratotüüp |
Mens, K., Pirrus, E. 1980. К стратиграфической номенклатуре вендских отложений Эстонии [On stratigraphical nomenclature of Vendian beds of Estonia]. Eesti NSV Teaduste Akadeemia Toimetised. Geoloogia / Известия Академии наук Эстонской ССР. Геология 29(2), p. 49-54. https://doi.org/10.3176/geol.1980.2.01 PDF
Erisalu, E., Tassa, V., Maldre, J., Paap, Ü., Põlma, L., Vaher, R. 1965. Отчёт о комплексной геолого-гидрогеологической съёмке восточной части Эстонского месторождения горючих сланцев м-ба 1:50 000 [Aruanne komplekssest geoloogilis-hüdrogeoloogilisest kaardistamisest mõõtkavas 1:50 000]. Geoloogiafond, . p. 1-123.
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