Abstract
Geological-petrological data were first obtained on the Early Miocene basaltoids and spinel-fassaite carbonatite tuffs of the Ambinsky volcanic structure in southwestern Primorye. The geological study of Ambinsky volcano allowed the reconstruction of stratigraphic sections across lava and pyroclastic basaltic rocks and stratified carbonatite tuffs. The chemical compositions of rocks and mineral phenocrysts from basalts and carbonatite tuffs are reported. The basaltoids are classed with undifferentiated moderately alkaline within-plate basalts. Evidence of carbonate-silicate immiscibility was found in the basaltoids and carbonatite tuffs. It was suggested that the formation of the carbonatite melt associated with simultaneous basification and abundant crystallization of spinel, fassaite, as well as oversaturation of the silicate system in Ca was caused by limestone assimilation, subsequent transformation of the melt, and liquid immiscibility. Thermal decomposition of carbonates with dissolution of released CaO in magma and accumulation of CO2 in a closed magmatic chamber gave rise to the autoclave gas effect and, correspondingly, heavy explosive eruptions atypical of such volcanic rocks. The genesis of carbonatite tuffs of Ambinsky volcano can serve as a model example of exsolution of carbonate melt in the moderately alkaline nonagpaitic basaltic system.
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References
Yu. A. Bagdasarov, “On the Main Petrochemical and Geochemical Peculiarities of Linear Carbonatites and Their Formation Conditions,” Geokhimiya 28(8)) 1108–1119 (1990).
Glossary of Geology (Moscow, 1978), Vol. 1 [in Russian].
Yu. L. Kapustin, Minerals of Carbonatites (Nauka, Moscow, 1971) [in Russian].
B. O. Mysen and A. L. Boettcher Melting of a hydrous mantle (J. Petrol. 16, 530–293; Mir, Moscow, 1979) [in Russian].
G. S. Plyusnin, V. S. Samoilov, and S. I. Golyshev, “Method of Isotopic Pairs of 13C, 18O and the Temperature Facies of Carbonatites,” Dokl. Akad. Nauk SSSR 254(5), 1241–1245 (1980).
V. K. Popov, S. O. Maksimov, A. A. Vrzhosek, and V. M. Chubarov, “Basaltic and Carbonatite Tuffs of Ambinsky Volcano (Southwestern Primorye): Geology and Origin,” Tikhookean. Geol. 26(4), 75–93 (2007).
S. V. Rasskazov, Fluid Regime of Cenozoic Volcanism in South Siberia Available from Vses. Inst. Ekon. Mineral. Syr’ya, No. 385-MG (Moscow, 1987) [in Russian].
S. V. Rasskazov, Magmatism of the Baikal Rift System (Vost. Otd. Nauka. Sib. Izd. Firma, Novosibirsk, 1993) [in Russian].
S. V. Rasskazov, A. A. Konev, A. M. Il’yasova, et al., “Zadoisky (548 M.Y.) Geochemical Evolution of the Zadoi Alkaline-Ultramafic Massif, Cis-Sayan Area, Southern Siberia,” Geokhimiya 44(1), 3–18 (2007) [Geochem. Int. 44 (1), 1–14 (2007)].
N. A. Solodov, “Genetic Types of Rare Metal Carbonatites,” Otech. Geol., No. 9, 12–18 (1996).
D. Lentz, “Carbonatite Genesis: A Reexamination of the Role of Intrusion-Related Pneumatolytic Skarn Processes in Limestone Melting,” Geology 27, 335–338 (1999).
Y. Tatsumi, R. Arai, and K. Ishizaka, “The Petrology of a Melilite-Olivine Nephelinite from Hamads, SW Japan,” J. Petrol. 40(4), 497–509 (1999).
K. Yang, J-Y. Hwang, and S-H. Yun, “Petrogenesis of the Ulsan Carbonate Rocks from the South-Eastern Kyongsang Basin, South Korea,” The Island Arc 12, 411–422 (2003).
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Original Russian Text © V.K. Popov, S.O. Maksimov, A.A. Vrzhosek, V.M. Chubarov, 2007, published in Tikhookeanskaya Geologiya, 2007, Vol. 1, No. 4, pp. 75–97.
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Popov, V.K., Maksimov, S.O., Vrzhosek, A.A. et al. Basaltoids and carbonatite tuffs of Ambinsky volcano (Southwestern Primorye): Geology and genesis. Russ. J. of Pac. Geol. 1, 371–389 (2007). https://doi.org/10.1134/S1819714007040069
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DOI: https://doi.org/10.1134/S1819714007040069