Abstract
A new, Krasnaya Guba dike field that comprises more than 30 minor gabbronorite intrusions and dikes of “garnet” Fe-gabbro was revealed at the northeastern flank of the Belomorian Mobile Belt. Gabbronorite intrusions were emplaced along the faults that formed as a result of brittle failure under conditions of general extension. As follows from the structural relationships, dikes of Fe-gabbro are younger than gabbronorite. They were formed under compression and shearing. The mobile melt was pumped into gneisses that underwent ductile deformation. Eclogitization in the Krasnaya Guba dike field was selective and affected only dikes of Fe-gabbro and minor gabbronorite intrusions and did not develop in country rocks. The bodies of Fe-gabbro are eclogitized almost completely, whereas gabbronorite is transformed into eclogite only along shear zones. Eclogites were formed after the complete solidification of intrusive bodies, and their localization is controlled by the concentration of deformations owing to the different elastoplastic properties of gabbroic rocks and country gneisses and migmatites. The different degree of fracturing in basic dikes and country gneisses resulted in the concentration of fluid flows in fracture systems within competent rocks. Late Svecofennian pegmatites (1.86 Ga) distinctly crosscut eclogites that experienced retrograde metamorphism. The eclogitic rocks from the Krasnaya Guba are the youngest known in the Belomorye. The age of eclogitization is 2.12–1.86 Ga. A new finding of eclogitic rocks in the Belomorye, as well as previously known similar rocks near Gridino Village, emphasize tectonic activity of the northwestern Umba Collision Zone. The eclogitization of basic rocks in Krasnaya Guba is related to their desilification in shearing zones in the course of interaction of plagioclase with ortho-and clinopyroxene with the formation of garnet-omphacite aggregate and removal of silica. The currently observed texture, structure, and chemical and mineral compositions of eclogitic rocks are products of intense retrograde metamorphism.
Similar content being viewed by others
References
V. V. Balagansky, V. N. Glaznev, and L. G. Osipenko, “The Early Proterozoic Evolution of the Northeastern Baltic Shield: A Terrane Analysis,” Geotektonika 32(2), 16–28 (1998) [Geotectonics 32 (2), 81–92 (1998)].
E. V. Bibikova, S. Klaisson, S. V. Bogdanova, et al., “Evolution of the Belomorian Belt: U-Pb Zircon Geochronology (Ion Microprobe Data),” in The Belomorian Mobile Belt and Its Analogues: Geology, Geochronology, Geodynamics, and Minerageny (Guidebook and Proceedings of Conference) (Karelian Sci. Center, Russian Acad. Sci., Petrozavodsk, 2005), pp. 133–135 [in Russian].
O. I. Volodichev, Belomorian Complex of Karelia (Nauka, Leningrad, 1990) [in Russian].
O. I. Volodichev, A. I. Slabunov, E. V. Bibikova, et al., “The Archean Eclogites in the Belomorian Mobile Belt, Baltic Shield,” Petrologiya 12(6), 609–631 (2004) [Petrology 12 (6), 540–560 (2004)].
O. I. Volodichev, A. I. Slabunov, O. V. Parfenova, et al., “Eclogitization of Gabbro in Dikes from Lherzolite-Gabbro-Norite Complex: the Paleoproterozoic Eclogites,” in The Belomorian Mobile Belt and Its Analogues: Geology, Geochronology, Geodynamics, and Minerageny (Guidebook and Proceedings of Conference) (Karelian Sci. Center, Russian Acad. Sci., Petrozavodsk, 2005), pp. 133–135 [in Russian].
V. M. Kozlovsky, D. I. Korpechkov, and L. Ya. Aranovich, “New Finds of Eclogitized Basic Rocks in the Belomorian Mobile Belt and Possible Interpretation of Their Genesis,” in Proceedings of the 40th Tectonic Conference on the Basic Problems of Geotectonics (GEOS, Moscow, 2007), Vol. 1, pp. 315–318 [in Russian].
S. P. Korikovsky, “Reaction Phase Equilibria by Recrystallization of Paleoproterozoic Gabbronorites of the Belomorian Complex under Conditions Close to the Boundary between Amphibolite and Eclogite Facies,” in The Belomorian Mobile Belt and Its Analogues: Geology, Geochronology, Geodynamics, and Minerageny (Guidebook and Proceedings of Conference) (Karelian Sci. Center, Russian Acad. Sci., Petrozavodsk, 2005), pp. 189–191 [in Russian].
V. N. Lodochnikov, Major Rock-Forming Minerals (Gosgeoltekhizdat, Moscow, 1955) [in Russian].
The Early Precambrian of the Baltic Shield, Ed. by V. A. Glebovitsky (Nauka, St. Petersburg, 2005) [in Russian].
A. I. Slabunov, O. I. Volodichev, and E. V. Bibikova, “U-Pb Geochronology, Nd Systematics, and Petrology of the Early Proterozoic Eclogites in the Belomorian Mobile Belt (Baltic Shield),” in Proceedings of the 2nd Russian Conference on Isotopic Geochronology (Inst. Precambr. Geol. Geochronol., St. Petersburg, 2003), pp. 465–467 [in Russian].
A. I. Slabunov, A. N. Larionov, E. V. Bibikova, et al., “Geology and Geochronology of the Shobozero Massif of Lherzolite-Gabbronorite Complex in the Belomorian Mobile Belt,” in Geology and Mineral Resources in Karelia (Karelian Sci. Center, Russian Acad. Sci., Petrozavodsk, 2001), Vol. 3, pp. 3–14 [in Russian].
V. S. Stepanov, Precambrian Basic Magmatism in the Western Belomorye (Nauka, Leningrad, 1981) [in Russian].
V. S. Stepanov, “Igneous Rocks near the Gridino Village (Composition, Sequence of Formation and Some Features of Their Evolution),” in The Precambrian in the Northern Karelia (Karelian Branch, Acad. Sci. USSR, Petrozavodsk, 1990), pp. 78–101 [in Russian].
V. S. Stepanov and A. V. Stepanova, “The Gridino Dike Field: Geology, Geochemistry, and Petrology,” in The Belomorian Mobile Belt and Its Analogue: Geology, Geochronology, Geodynamics, and Minerageny (Guidebook and Proceedings of Conference) (Karelian Sci. Center, Russian Acad. Sci., Petrozavodsk, 2005), pp. 285–288 [in Russian].
A. V. Stepanova, A. N. Larionov, E. V. Bibikova, et al., “Early Proterozoic (2.1 Ga) Fe-Tholeiitic Magmatism of the Belomorian Province, Baltic Shield: Geochemistry and Geochronology” Dokl. Akad. Nauk 390(4), 528–532 (2003) [Dokl. Earth Sci. 390 (4), 607–610 (2003)].
V. V. Travin and N. E. Kozlova, “Local Shear Deformations as a Cause of Eclogitization: Evidence from the Gridino Melange Zone, Belomorian Mobile Belt,” Dokl. Akad. Nauk 405(3), 376–380 (2005) [Dokl. Earth Sci. 405A (9), 1275–1278 (2005)].
N. L. Chaplygina, V. A. Utenkov, T. Yu. Panina, et al., “Carbonate-Silicate Veinlets in Amphibolites of Northern Karelia,” Izv. Vuzov. Geol. Razved., No. 2, 148–151 (1997).
B. M. Chikov, “Shear-Stress-Related Structure in the Lithosphere: Phases, Mechanisms, Conditions: A Review of Problem,” Geol. Geofiz. 33(9), 3–39 (1992).
E. V. Sharkov and M. M. Bogina, “Evolution of Paleoproterozoic Magmatism: Geology, Geochemistry, and Isotopic Constraints,” Stratigr. Geol. Korrelyatsiya 14(4), 3–27 (2006) [Stratigr. Geol. Correlation 14 (4), 345–367 (2006)].
E. V. Sharkov, I. S. Krasivskaya, and A. V. Chistyakov, “Dispersed Mafic-Ultramafic Intrusive Magmatism in Mobile Zones during the Early Paleoproterozoic of the Baltic Shield with Reference to Drusite (Coronite) Complex in the Belomorian Zone,” Petrologiya 12(6), 632–655 (2004).
A. A. Shchipansky, A. N. Konilov, M. V. Mints et al., “Formation Geodynamics of the Early Continental Crust in the Light of Finding of the Archean Eclogites in the Belomorian Mobile Belt, Kola Peninsula, in Proceedings of the 38th Tectonic Conference (GEOS, Moscow, 2005), Vol. 2, pp. 389–392 [in Russian].
A. A. Shchipansky, A. N. Konilov, M. V. Mints, et al., “The Late Archean Eclogites of Salma, Belomorian Mobile Belt, Kola Peninsula, Russia: Petrogenesis, Age, and Implications for the Geodynamic Interpretation of Formation Conditions of the Early Continental Crust,” in The Belomorian Mobile Belt and Its Analogues: Geology, Geochronology, Geodynamics, and Minerageny (Guidebook and Proceedings of Conference) (Karelian Sci. Center, Russian Acad. Sci., Petrozavodsk, 2005), pp. 324–327 [in Russian].
L. Ya. Aranovich and R. G. Berman, “Optimized Standard State and Solution Properties of Minerals: II. Comparisons, Predictions, and Applications,” Contrib. Mineral. Petrol. 126, 25–37 (1996).
R. G. Berman, “Thermobarometry Using Multiequilibrium Calculations: A New Technique with Petrologic Applications,” Can. Mineral. 29, 833–855 (1991).
R. G. Berman and L. Ya. Aranovich, “Optimized Standard State and Solution Properties of Minerals: I. Model Calibration for Olivine, Orthopyroxene, Cordierite, Garnet, and Ilmenite in the System FeO-MgO-CaO-Al2O3-TiO2-SiO2,” Contrib. Mineral. Petrol. 126, 1–24 (1996).
C. E. Manning, “The Solubility of Quartz in H2O in the Lower Crust and Upper Mantle,” Geochim. Cosmochim. Acta 58(22), 4831–4839 (1994).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.M. Kozlovsky, L.Ya. Aranovich, 2008, published in Geotektonika, 2008, No. 4, pp. 70–84.
Rights and permissions
About this article
Cite this article
Kozlovsky, V.M., Aranovich, L.Y. Geological and structural conditions of eclogitization of Paleoproterozoic basic dikes in the eastern Belomorian Mobile Belt. Geotecton. 42, 305–317 (2008). https://doi.org/10.1134/S0016852108040043
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0016852108040043