Vesuvianite – a New Mineral for U-Pb Dating of Ore Deposites

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Resumo

The results of U–Pb (ID-TIMS) geochronological studies of vesuvianite from ore-bearing metasomatites of Khopunvaara (Pitkyaranta ore district, Northern Ladoga region) are presented. The resulting age estimate (1550 ± 6 MA) within the error in agreement with the age of formation of ore-bearing skarns genetically related to the rapakivi granites of the Salma batholith. This indicates the possibility of using vesuvianite as a U–Pb mineral-geochronometer, including for ore-bearing contact-reaction rocks.

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Sobre autores

M. Stifeeva

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: stifeeva.maria@yandex.ru
Rússia, Saint Petersburg

Т. Panikorovsky

Kola Science Center of the Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru
Rússia, Apatity

A. Larin

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru
Rússia, Saint Petersburg

E. Salnikova

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru
Rússia, Saint Petersburg

А. Kotov

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru

Corresponding Member of the RAS

Rússia, Saint Petersburg

V. Bortnikov

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: stifeeva.maria@yandex.ru
Rússia, Saint Petersburg

Bibliografia

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2. Fig. 1. Geological structure of the Salma batholith and location of deposits of the Pitkäranta ore district. According to [5] with additions and modifications. 1 - platform cover; 2 - yotnium volcanogenic-sedimentary formations (Salma Formation); 3-10 - rocks of the Salma batholith: 3 - topaz-bearing granites (Li-F-granites), 4 - fine-grained porphyritic biotite granites; 5 - coarse-grained biotite granites; 6 - coarse-grained biotite-hornblende granites; 7 - ovoid biotite-hornblende rapakivi granites with fine-grained basic mass; 8 - vyborgites and piterlites; 9 - coarse-grained biotite-hornblende quartz syenites; 10 - basic and medium rocks (anorthosites, norites, ferrodiorites, monzonites); 11-12 - PR1 supracrustal rocks: 11 - Svekofen folded area (Sortavala and Ladoga series); 12 - Karelian craton; 13 - AR2-PR1 gneissogranites of domes; 14-16 - AR2 complexes of the Karelian craton: 14 - granites and migmatite-granites; 15 - greenstone belts; 16 - TTG-association; 17 - deposits and ore occurrences of the Pitkyaranta ore district. Deposits: 1-4 - skarn-propylitic Sn-polymetallic: 1 - Yukan Koski, 2 - Kiteli, 3 - Old ore field, 4 - Heposelka; 5-10 - skarn-greisen-propylitic Sn-We Sn-We-polymetallic: 5 - New ore field, 6 - Hopunvaara, 7 - Lupikko, 8 - South Lupikko, 9 - Ristiniemi, 11 - Uuksa

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3. Fig. 2. Geological scheme of the Khopunvaara deposit, Pitkäranta ore district. According to [5] with additions and modifications. 1 - aluminous shales of the Ladoga series; 2 - amphibole shales and amphibolites of the Pitkäranta Formation; 3 - gneissogranites of domes; 4 - ovoid biotite-hornblende granites of Rapakivi of the Salma massif; 5 - Li-F-granites; 6 - ceramic pegmatites; 7-8 - ore-bearing carbonate horizons of the Pitkäranta Formation (7 - upper, 8 - lower); 9 - ore deposits; 10 - faults; 11 - mines; 12 - elements of metamorphic rock occurrence

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4. Fig. 3. Crystal structure of vesuvian from metasomatites of Hopunvaara occurrence ores. Projection along the c-axis (a) and along the b-axis. SiO4 tetrahedrons are marked in yellow, Y(3)O6 octahedrons in blue and Y(2)O6 octahedrons in blue, Y(1)O5 pyramids in brown, Ca positions are marked with blue spheres and O positions are marked with red spheres

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5. Fig. 4. Fragments of the crystal structure of vesuvian from metasomatites of the Hopunvaara ore occurrence. Sequence of positions Y1-X4, as well as O10 in the channels of the structure (a); local environment of position T1 (b), Location of hydroxyl groups in the structure of vesuvian, in the case of vacancy in position T1 (c)

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6. Fig. 5. Concordia diagram for vesuvian from metasomatites of the Hopunvaara ore occurrence. Point numbers correspond to ordinal numbers in Table 1

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