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Shameika |
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Russia |
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Mo
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The small Shameika porphyry molybdenum deposit is located on the eastern margin of the Adui composite granitic pluton, near Malyshevo, 55 km north-east of Ekaterinburg ( Yekaterinburg ) in the Urals region of Russia.
A number of polymetallic and emerald deposits are found along the southern and eastern exocontact zones of the Adui granite which comprises a high K, biotite-orthoclase granite phase and a two mica microcline granite enriched in Rb, Li and Cs. The pluton is intruded along the contact between Precambrian migmatites and biotite orthogneisses to the west and Palaeozoic volcanosedimentary rocks to the east. The main Adui pluton and adjacent Palaeozoic volcanics and sediments are intruded by the smaller 6x2 km Malyshevo leucogranite stock which hosts the Shameika porphyry molybdenum deposit. It is composed of albite-oligoclase, latticed microcline, quartz, biotite and muscovite and is enriched in fluorine in the vicinity of the molybdenum mineralisation.
The deposit occurs as a 1200 x 200 m stockwork of ore veinlets. Faulting has offset the leucogranite to produce a concealed repetition overlain by amphibolite schist which has been altered to a banded biotite-epidote and calcite rock cut by a dense network of granitic dykes. Mineralisation can be traced to a depth of 220 to 280 m. The stockwork is hosted 75% by the leucogranite as a dense network of molybdenite bearing quartz veins and 25% by the exocontact hornfels as thin molybdenite and pyrite bearing fluorite-quartz veinlets.
Both hosts are strongly altered. The leucogranite has been altered to a pink colouration due to an increase in K feldspar and albite, and quartz depletion. Fine grained molybdenite occurs as banded aggregates of parallel flakes concentrated with pyrite near the margins of the veinlets in both hosts, .
A resource has been outlined of approximately: 54 Mt @ 0.08% Mo.
For detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2002.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Mao J, Du A, Seltmann R, Yu J 2003 - Re-Os ages for the Shameika porphyry Mo deposit and the Lipovy Log rare metal pegmatite, central Urals, Russia: in Mineralium Deposita v38 pp 251-257
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