Petrological implications of the Early Mesozoic lamprophyre dikes and related Tarkhata syenites (SE Altai and NW Mongolia)

• Autorzy: Vasyukova E. A. , Borisenko A. S.

Identyfikatory

DOI

10.2478/mipo-2013-0002

• Języki publikacji: EN

Abstrakty

EN

This paper presents new data derived from field sampling and from a thorough description of lamprophyres located in southeastern Altai and northwestern Mongolia in terms of their mineralogy, textures, and chemical composition. The swarms of alkaline mafic dikes in the area coexist with granosyenite-monzodiorite and gabbro-dolerite intrusions and spatially coincide with an ore district of Sb-Hg, Ag-Sb, Ni-Co-As, Cu-Mo-W, and CaF2 hydrothermal mineralization. All lamprophyres belong to the Early Mesozoic Chuya complex formed in an intracontinental enviroment. Their distribution and orientation is controlled by two large fault zones. The Chuya dikes were investigated at two localities, namely, Yustyd and South-Chuya. The Yustyd lamprophyres intrude Middle-Upper Devonian black shale of the Yustyd depression. At South Chuya, lamprophyres, together with the Tarkhata granosyenite-monzodiorite complex, are hosted by Cambrian and Ordovician metamorphic rocks of the South-Chuya Range. Ar-Ar (phlogopite) and U-Pb (SHRIMP, zircon) ages of the lamprophyre dikes indicate long and continuous period of the formation of the Chuya complex (250-235 Ma). Major- and trace-element compositions of the lamprophyres from both localities and of the syenite indicate their origin from the same magma source. The textures and structures of the lamprophyre and plutonic rocks, their mineral assemblages and the chemistry of the rock-forming minerals provide clues to the evolution of the parental alkaline mafic magma and fluid regime.

Słowa kluczowe

EN

lamprophyre; syenites; petrology; SE Altai; NW Mongolia

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2013
• Tom: Vol. 44, iss. 1/2
• Strony: 13--30
• Opis fizyczny: Bibliogr. 11 poz., tab., fot., rys., wykr.

Twórcy

autor

Vasyukova E. A.

• Institute of Geology and Mineralogy SB RAS, 3 Ak. Koptyuga Av., 630090 Novosibirsk, Russia

autor

Borisenko A. S.

• Institute of Geology and Mineralogy SB RAS, 3 Ak. Koptyuga Av., 630090 Novosibirsk, Russia

Bibliografia

• Borisenko, A.S., Pavlova, G.G., Vasyukova, E.A., Travin, A.V., Goverdovskii, V.A., & Gusev, N.I. (2010). Ages of lamprophyres of Altai and NE Mongolia and their relations with other types of magmatism and ore mineralization. In: A.I. Chernyh & R.S. Rodina (Eds.), Geology and ore deposits of Siberia. pp. 143-148. Novosibirsk: SNIIGGiMS.
• Bushlyakov, I.N. (1969). Titanium content in the amphibole and biotite from granitoids as an indicator of the conditions of their formation. Reports of AS USSR 186(4), 1154-1157.
• Dobretsov, N.L., Borisenko, A.S., Isokh, A.E., & Zhmodik, S.M. (2010). A thermochemical model of Eurasian Permo-Triassic mantle plumes as basis for prediction and exploration for Cu-Ni-PGE and rare-metal ore deposites. Russian Geology and Geophysics, 51(9), 1159-1187.
• Izokh, E.P., Kononov, A.N., & Kononov, O.A. (1987). Systematic and formational analysis of the granitoids of the Gorny Altai. Systematic of the magmatic formations. Novosibirsk: Nauka. 97-147.
• McDonough, W.F., Sun, S., & Ringwood, E.A. (1992). K, Rb and Cs in the earth and moon and the evolution of the earth's mantle. Geochimica Cosmochimica Acta, 56, 1001-1012.
• Nebera, T.S. (2007). Petrogenetic significance of biotite from granitoids of the Novosibirsk Ob. In: Petrology of magmatic and metamorphic complexes, Tomsk. 6, 113-118. Tomsk State University.
• Obolenskaya, R.V. (1971) Chuya complex of alkali basaltoids of Gorny Altai. Novosbirsk: Nauka.
• Panina, L.I., & Motorina, I.V. (2008). Liquid immiscibility of abyssal magmas and origin of carbonatite melt. Geochemistry, 5, 487-504.
• Phershtater, G.B., & Borodina, N.S. (1975) Petrology of magmatic granitoids (on the sample of Ural). Moscow: Nauka.
• Righter, K., & Carmichael, I.S.E. (1996). Phase equilibria of phlogopite lamprophyres from western Mexico: biotite-liquid equilibria and P-T estimates for biotite-bearing igneous rocks. Contributions to Mineralogy and Petrology 123, 1-21.
• Safonov, O.G. (2007) Evolution models of abyssal alkali liquids. Thesis of doctoral dissertation. Moscow.