On the basis of new data on melt inclusions in clinopyroxenes, we have established the physicochemical conditions (magma compositions, temperature, and pressure) of formation of boninites in ophiolites of the Dzhida zone (northern Mongolia) and have determined the parameters of generation of primary magmas (T = 1400–1500 °C, P = 10–30 kbar, depth 30–90 km) and the crystallization temperatures of boninite melts (T = 1170–1250 °C). Ion microprobing of Vendian-Cambrian boninites helped to investigate the trace and rare-earth element patterns of their melt inclusions. The patterns of the host clinopyroxenes agree with the data on inclusions and show that the crystallizing minerals were in equilibrium with the melt. The melt compositions evidence the existence of at least two types of primary melts that produced ophiolites of the Dzhida zone: boninite and calc-alkalic andesite-basalt.
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Research Article|
June 01, 2004
CONDITIONS OF PETROGENESIS OF BONINITES IN OPHIOLITES OF THE DZHIDA ZONE, NORTHERN MONGOLIA (from data on melt inclusions)
V.A. Simonov;
V.A. Simonov
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
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A.I. Al’mukhamedov;
A.I. Al’mukhamedov
*
Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, Irkutsk, 664033, Russia
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S.V. Kovyazin;
S.V. Kovyazin
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
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A.Ya. Medvedev;
A.Ya. Medvedev
*
Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, Irkutsk, 664033, Russia
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Yu.V. Tikunov
Yu.V. Tikunov
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
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V.A. Simonov
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
A.I. Al’mukhamedov
*
Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, Irkutsk, 664033, Russia
S.V. Kovyazin
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
A.Ya. Medvedev
*
Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, Irkutsk, 664033, Russia
Yu.V. Tikunov
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
Publisher: Novovsibirsk State University
Received:
13 Sep 2002
First Online:
29 Oct 2022
Online ISSN: 1878-030X
Print ISSN: 1068-7971
© 2004 UIGGM, SIBERIAN BRANCH OF THE RAS
UIGGM, SIBERIAN BRANCH OF THE RAS
Russ. Geol. Geophys. (2004) 45 (6): 651–662.
Article history
Received:
13 Sep 2002
First Online:
29 Oct 2022
Citation
V.A. Simonov, A.I. Al’mukhamedov, S.V. Kovyazin, A.Ya. Medvedev, Yu.V. Tikunov; CONDITIONS OF PETROGENESIS OF BONINITES IN OPHIOLITES OF THE DZHIDA ZONE, NORTHERN MONGOLIA (from data on melt inclusions). Russ. Geol. Geophys. 2004;; 45 (6): 651–662. doi:
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Index Terms/Descriptors
- andesites
- andesitic composition
- Asia
- basaltic composition
- boninite
- calc-alkalic composition
- Cambrian
- chain silicates
- clinopyroxene
- computer programs
- data processing
- Far East
- fluid inclusions
- glasses
- homogenization
- igneous rocks
- inclusions
- magmas
- melt inclusions
- metals
- microthermometry
- Mongolia
- Neoproterozoic
- ophiolite
- P-T conditions
- Paleozoic
- Precambrian
- Proterozoic
- pyroxene group
- rare earths
- silicates
- temperature
- upper Precambrian
- Vendian
- volcanic rocks
- Dzhida Zone
- Namarandal-Obo Mountain
- Bayan Gol River basin
- Dzhida River valley
Latitude & Longitude
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