AMPLITUDES OF DISJUNCTIVE DISLOCATIONS IN THE KNIPOVICH RIDGE FLANKS (NORTHERN ATLANTIC) AS AN INDICATOR OF MODERN REGIONAL GEODYNAMICS
https://doi.org/10.5800/GT-2017-8-4-0316
Abstract
This article presents the first map showing the vertical amplitudes of modern disjunctive dislocations inNorthern Atlantic, based on the estimated phase shifts of reflected waves recorded by high-frequency seismic acoustic surveys. The amplitude distribution pattern is mosaic with alternating areas of compression and extension in the flanks of the Knipovich rift system. The modern structure of the Knipovich Ridge, including two strike-slip faults, represents a local rift in the pull-apart setting. The asymmetry of stresses and the presence of compression in the ridge flanks is evidenced by the distribution of the focal mechanisms of strong earthquakes related to reverse faults. In the southeastern Knipovich Ridge, tectonic activity is marked by the asymmetric pattern of the epicenters of small earthquakes.
About the Authors
S. Yu. Sokolov
Geological Institute of RAS
Russian Federation
Russian Federation
Sokolov, Sergey Yu., Candidate of Physics and Mathematics, Lead Researcher
7 Pyzhevsky Lane, Moscow 119017, Russia
A. S. Abramova
Geological Institute of RAS
Russian Federation
Russian Federation
Abramova, Anastasia S., Junior Researcher
7 Pyzhevsky Lane, Moscow 119017, Russia
E. A. Moroz
Geological Institute of RAS
Russian Federation
Russian Federation
Moroz, Evgenii A., Researcher
7 Pyzhevsky Lane, Moscow 119017, Russia
Yu. A. Zaraiskaya
Geological Institute of RAS
Russian Federation
Russian Federation
Zarayskaya, Yulia A., Junior Researcher
7 Pyzhevsky Lane, Moscow 119017, Russia
References
1. Abramova A.S., Sokolov S.Yu., Moroz E.A., 2016. Mapping of neotectonic elements in the mid-ocean ridge based on high-frequency profiling data. In: D.E. Dorechkina (Ed.), New data on geology and geophysics of Arctic, Antarctic and Global ocean. Proceedings of the 5th international conference of young scientists and specialists, dedicated to the 100th jubilee of V.N. Sokolov. VNIIOkeangeologia, St. Petersburg, p. 80–81 (in Russian) [Абрамова А.С., Соколов С.Ю., Мороз Е.А. Картирование неотектонических элементов в условиях срединно-океанического хребта по данным высокочастотного профилографа // Новое в геологии и геофизике Арктики, Антарктики и Мирового океана: Материалы V Международной конференции молодых ученых и специалистов, посвященной 100-летию со дня рождения В.Н. Соколова / Ред. Д.Е. Доречкина. СПб.: ВНИИОкеангеология, 2016. С. 80–81].
2. Bondarenko P.M., Luchitsky I.V., 1985. Strike-slip faults and shear zones in tectonic stress fields. In: I.V. Luchitsky, P.M. Bondarenko (Eds.), Experimental tectonics in theoretical and applied geology. Nauka, Moscow, p. 159–182 (in Russian) [Бондаренко П.М., Лучицкий И.В. Сдвиги и зоны скалывания в тектонических полях напряжений // Экспериментальная тектоника в теоретической и прикладной геологии / Ред. И.В. Лучицкий, П.М. Бондаренко. М.: Наука, 1985. С. 159–182].
3. Bugrova E.M., Gusev E.A., Tverskaya L.A., 2001. Oligocene rocks of Knipovich Ridge. In: Geology of seas and oceans. Abstracts of the 14th International School of Marine Geology. Vol. I. GEOS, Moscow, p. 28–29 (in Russian) [Бугрова Э.М., Гусев Е.А., Тверская Л.А. Олигоценовые породы хребта Книповича // Геология морей и океанов: Тезисы докладов XIV Международной школы морской геологии. М.: ГЕОС, 2001. Т. I. С. 28–29].
4. Crane K., Doss H., Vogt P., Sundvor E., Cherkashov G., Poroshina I., Joseph D., 2001. The role of the Spitsbergen shear zone in determining morphology, segmentation and evolution of the Knipovich Ridge. Marine Geophysical Researches 22 (3), 153–205. https://doi.org/10.1023/A:1012288309435.
5. Escartín J., Cowie P.A., Searle R.C., Allerton S., Mitchell N.C., MacLeod C.J., Slootweg A.P., 1999. Quantifying tectonic strain and magmatic accretion at a slow spreading ridge segment, Mid-Atlantic Ridge, 29°N. Journal of Geophysical Research: Solid Earth 104 (B5), 10421–10437. https://doi.org/10.1029/1998JB900097.
6. Global Centroid Moment Tensor Project, 2014. On-line Bulletin. Available from: http://www.globalcmt.org (last accessed June 10, 2014).
7. Gusev E.A., Shkarubo S.I., 2001. The anomalous structure of Knipovich Ridge. Russian Journal of Earth Sciences 3 (2), 145–161. https://doi.org/10.2205/2001ES000056.
8. Khain V.E., Lomize M.G., 2005. Geotectonics and Fundamentals of Geodynamics. KDU, Moscow, 560 p. (in Russian) [Хаин В.Е., Ломизе М.Г. Геотектоника с основами геодинамики. М.: КДУ, 2005. 560 с.].
9. Kirmasov A.B., 2011. Fundamentals of Structural Analysis. Nauchny Mir, Moscow, 368 p. (in Russian) [Кирмасов А.Б. Основы структурного анализа. М.: Научный мир, 2011. 368 с.].
10. Kokhan A.V., Dubinin E.P., Grokholsky A.L., Abramova A.S., 2012. Kinematics and characteristic features of the morphostructural segmentation of the Knipovich Ridge. Oceanology 52 (5), 688–699. https://doi.org/10.1134/S0001437012050098.
11. Mosar J., Eide E.A., Osmundsen P.T., Sommaruga A., Torsvik T.H., 2002. Greenland–Norway separation: a geodynamic model for the North Atlantic. Norwegian Journal of Geology 82 (4), 281–298.
12. NORSAR Reviewed Regional Seismic Bulletin, 2012. Available from: http://www.norsardata.no/NDC/bulletins/regional/ (last accessed September 22, 2012).
13. Olesen O.G., Gellein J., Habrekke H., Kihle O., Skilbrei J.R., Smethurst M.A., 1997. Magnetic Anomaly Map, Norway and Adjacent Ocean Areas. Scale 1:3000000. Geological Survey of Norway, Trondheim.
14. Peive A.A., Chamov N.P., 2008. Basic tectonic features of the Knipovich Ridge (North Atlantic) and its neotectonic evolution. Geotectonics 42 (1), 31–47. https://doi.org/10.1134/S0016852108010044.
15. Shipilov E.V., 2004. Tectono-geodynamic evolution of Arctic continental margins during epochs of young ocean formation. Geotectonics 38 (5), 343–365.
16. Sokolov S.Y., 2011. Tectonic evolution of the Knipovich Ridge based on the anomalous magnetic field. Doklady Earth Sciences 437 (1), 343–348. https://doi.org/10.1134/S1028334X11030275.
17. Sokolov S.Y., Abramova A.S., 2015. Mapping of vertical amplitudes of faults in the deep ocean according to high-frequency profiling data. In: Geology of seas and oceans. Proceedings of the 21st International Scientific Conference (School) on Marine Geology. Vol. V. GEOS, Moscow, p. 252–255 (in Russian) [Соколов С.Ю., Абрамова А.С. Картирование вертикальных амплитуд разломов в глубоководной части океана по данным высокочастотного профилографа // Геология морей и океанов: Материалы XXI Международной научной конференции (Школы) по морской геологии. Т. V. М.: ГЕОС, 2015. C. 252–255].
18. Sokolov S.Y., Abramova A.S., Mazarovich A.O., Zaraiskaya Yu.A., Dobrolyubova K.O., 2013. Geodynamic interpretation of faults in the northern Knipovich Ridge. In: Geologic history, possible mechanisms and problems of formation of depressions with suboceanic and anomalously thin crust in provinces with continental lithosphere. Proceedings of the 45th Tectonic Meeting. GEOS, Moscow, p. 212–214 (in Russian) [Соколов С.Ю., Абрамова А.С., Мазарович А.О., Зарайская Ю.А., Добролюбова К.О. Геодинамическая интерпретация разломов северной части хребта Книповича // Геологическая история, возможные механизмы и проблемы формирования впадин с субокеанической и аномально тонкой корой в провинциях с континентальной литосферой: Материалы XLV Тектонического совещания. М.: ГЕОС, 2013. С. 212–214].
19. Sokolov S.Y., Abramova A.S., Zaraiskaya Y.A., Mazarovich A.O., Dobrolyubova K.O., 2014. Recent tectonics in the northern part of the Knipovich Ridge, Atlantic ocean. Geotectonics 48 (3), 175–187. https://doi.org/10.1134/S0016852114030066.
20. Tevelev A.V., 2005. Tectonics of Shearing. Publishing House of Moscow State University, Moscow, 254 p. (in Russian) [Тевелев А.В. Сдвиговая тектоника. М.: Изд-во МГУ, 2005. 254 с.].
21. Verba V.V., Avetisov G.P., Sholpo L.Ye., Stepanova T.V., 2000. Basalts geodynamics and magnetism of the Knipovich underwater ridge (Norway – Greenland basin). Russian Journal of Earth Sciences 2 (3–4), 303–312 (in Russian) [Верба В.В., Аветисов Г.П., Шолпо Л.Е., Степанова Т.В. Геодинамика и магнетизм базальтов подводного хребта Книповича (Норвежско-Гренландский бассейн) // Российский журнал наук о Земле. 2000. Т. 2. № 3–4. С. 303–312]. https://doi.org/10.2205/2000ES000047.
22. Yampol’sky K.P., 2011. New data on the structure of the Knipovich Ridge, North Atlantic. Geotectonics 45 (2), 113–126. https://doi.org/10.1134/S0016852111020063.
23. Zaraiskaya Yu.A., 2016. Geomorphology, Seismicity and Neotectonics of the Mid-Oceanic Ridge in the Norwegian-Greenland Basin and the Fram Strait. Brief Thesis (Candidate of Geology and Mineralogy). GIN RAS, Moscow, 31 p. (in Russian) [Зарайская Ю.А. Геоморфология, сейсмичность и неотектоника срединно-океанического хребта в Норвежско-Гренландском бассейне и проливе Фрама: Автореф. дис. … канд. геол.-мин. наук. М.: ГИН РАН, 2016. 31 с.].
24. Zayonchek A.V., Brekke H., Sokolov S.Yu., Mazarovich A.O., Dobrolyubova K.O., Efimov V.N., Abramova A.S., Zaraiskaya Yu.A., Kokhan A.V., Moroz E.A., Peive A.A., Chamov N.P., Yampolsky K.P., 2010. Structure of the continent-ocean transition zone in the northwestern Barents Sea frame (according to the data collected in cruises 24, 25 and 26 of the R/V Akademik Nikolai Strakhov in 2006–2009). In: Yu.G. Leonov (Ed.), Structure and evolution of the lithosphere. Russia's contribution to the International Polar Year. Vol. 4. Paulsen, Moscow. P. 111–157 (in Russian) [Зайончек А.В., Брекке Х., Соколов С.Ю., Мазарович А.О., Добролюбова К.О., Ефимов В.Н., Абрамова А.С., Зарайская Ю.А., Кохан А.В., Мороз Е.А., Пейве А.А., Чамов Н.П., Ямпольский К.П. Строение зоны перехода континент–океан северо-западного обрамления Баренцева моря (по данным 24, 25 и 26-го рейсов НИС «Академик Николай Страхов», 2006–2009 гг.) // Строение и история развития литосферы. Вклад России в Международный Полярный Год. Том. 4 / Ред. Ю.Г. Леонов. М.: Paulsen, 2010. C. 111–157].
Review
For citations:
Sokolov S.Yu., Abramova A.S., Moroz E.A., Zaraiskaya Yu.A. AMPLITUDES OF DISJUNCTIVE DISLOCATIONS IN THE KNIPOVICH RIDGE FLANKS (NORTHERN ATLANTIC) AS AN INDICATOR OF MODERN REGIONAL GEODYNAMICS. Geodynamics & Tectonophysics. 2017;8(4):769–789. (In Russ.) https://doi.org/10.5800/GT-2017-8-4-0316
Views:
985
Email this article 