PETROLOGICAL CHARACTERISTICS OF THE HANTAISHIR OPHIOLITE COMPLEX, ALTAI REGION, MONGOLIA: COEXISTENCE OF PODIFORM CHROMITITE AND BONINITE
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dc.contributor.author | Matsumoto I. | |
dc.contributor.author | Tomurtogoo O. | |
dc.date.accessioned | 2022-02-08T04:40:18Z | |
dc.date.available | 2022-02-08T04:40:18Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=31221150 | |
dc.identifier.citation | Gondwana Research, 2003, 6, 2, 161-169 | |
dc.identifier.issn | 1342-937X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/35103 | |
dc.description.abstract | Petrological and geochemical examination shows that the Hantaishir ophiolite complex of the Altai region in Mongolia contains two large ultramafic massifs (the Taishir and Naran massifs), a sheeted dyke complex, and a serpentine mélange zone containing blocks of chromitite and peridotites. The ultramafic massifs consist mainly of harzburgite and dunite with a small amount of podiform chromitite. Cr/(Cr+Al) atomic ratios of chromian spinels are high in the peridotites and sheeted dykes (>0.7), and in the chromitites (>0.8). Fo contents of olivines in the peridotites span a relatively narrow range (91.8-93.0). Most of the sheeted dykes are boninite-type high-Mg andesites. The coexistence of podiform chromitite and boninite in the Hantaishr ophiolite complex suggests that the ophiolite formed in an intra-oceanic subduction zone, from a depleted mantle source. | |
dc.subject | Dunite-harzburgite complex | |
dc.subject | boninite | |
dc.subject | chromitite | |
dc.subject | Hantaishir ophiolite | |
dc.subject | Altai Mongolia | |
dc.title | PETROLOGICAL CHARACTERISTICS OF THE HANTAISHIR OPHIOLITE COMPLEX, ALTAI REGION, MONGOLIA: COEXISTENCE OF PODIFORM CHROMITITE AND BONINITE | |
dc.type | Статья |
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