Sapphires from the Sutara Placer in the Russian Far East

Buravleva, S Y; Smirnov, S. Z.; Pakhomova, V. A.; Fedoseev, D. G.

doi:10.5741/gems.52.3.252

Cited by 4 publications

(3 citation statements)

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“…The size of biggest sapphire is 1.7 cm × 1.2 cm × 0.7 cm. Earlier trapiche sapphires of metamorphic origin were found in the Sutara placer, Russian Far East [15]. The Naryn-Gol is in fact the first discovered occurrence of basaltic trapiche sapphire in Russia.…”

Section: Corundummentioning

confidence: 95%

Naryn-Gol Creek Sapphire Placer Deposit, Buryatia, Russia

et al. 2022

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A new gem corundum occurrence has been discovered in the Naryn-Gol Creek placer of the Dzhida volcanic field (Russia). In this placer deposit, sapphire associates with large crystals of garnet, spinel, augite, olivine, enstatite, ilmenite, Ti-magnetite, and alkali feldspar. Such a combination of minerals is typical for the placer deposits associated with alkali basalts widely distributed in Southeastern Asia and Australia. We have also found sapphire crystals in phonotephrites of the nearby Cenozoic alkali-basalt paleovolcano Barun Khobol Pravyi, and in basalt sample and trachybasalt from the valley flood basalts. The chemical composition of sapphire is generally typical for ‘basalt’ corundum: it is rich in Fe, and depleted in Ti and Cr. The δ18O SMOW values of corundum and related megacrysts range from 4.6 to 6.8 ‰, thus corresponding to the isotopic signature of igneous rocks. Etched and corroded surfaces of sapphire and other megacrysts indicate that they are in non-equilibrium with their host alkali basalts. Volatile components, CO2 in particular, played a significant role during sapphire formation as gas inclusions reveal.

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Section: Corundummentioning

confidence: 95%

Naryn-Gol Creek Sapphire Placer Deposit, Buryatia, Russia

et al. 2022

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“…Íà ïðèìåðå äèàñïîðà, âïåðâûå îáíàðóaeåííîãî íàìè â êîðóíäàõ çîëîòîðóäíîãî ìåñòîðîaeäåíèÿ Ñóòàðà â êà÷å-ñòâå äî÷åðíåé ôàçû ïåðâè÷íûõ âêëþ÷åíèé [8] …”

Section: ââåäåíèåunclassified

“…Íà îñíîâå ýêñïåðèìåíòàëüíûõ è ðàñ÷åòíûõ äàííûõ ïîñòðî-åíû Ð-Ò-äèàãðàììû ñèñòåìû «äèàñïîð -êîðóíä -âî-äà» (AlO[OH]-Al 2 O 3 -H 2 O) [12, 18], ïîçâîëÿþùèå óñòà-íîâèòü ïàðàìåòðû êðèñòàëëèçàöèè òâåðäûõ ôàç. Îäíàêî ðåçóëüòàòû ýòèõ ýêñïåðèìåíòîâ íåâîçìîaeíî ýêñòðàïîëè-ðîâàòü íà ïðèðîäíûå îáñòàíîâêè, ïîñêîëüêó ïðèðîäíûå ôëþèäû îáîãàùåíû óãëåêèñëîòîé, ìåòàíîì è äðóãèìè êîìïîíåíòàìè, ÷òî âûçûâàåò ñìåùåíèå ðàâíîâåñèÿ «äè-àñïîð -êîðóíä» â íèçêîòåìïåðàòóðíóþ îáëàñòü.Íà ïðèìåðå äèàñïîðà, âïåðâûå îáíàðóaeåííîãî íàìè â êîðóíäàõ çîëîòîðóäíîãî ìåñòîðîaeäåíèÿ Ñóòàðà â êà÷å-ñòâå äî÷åðíåé ôàçû ïåðâè÷íûõ âêëþ÷åíèé [8] …”

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Conditions of formation of the diaspore in the primary fluid inclusions in corundum of the Sutara deposit (Russian Far East)

Buravleva¹,

Avchenko²,

Pakhomova³

2017

Vestnik IG KomiSC

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ÂâåäåíèåÈçó÷åíèþ êîðóíäîâ ïîñâÿùåíà îáøèðíàÿ ëèòåðàòó-ðà [10, 16, 17, 20, 22]. Äèàñïîð â êà÷åñòâå äî÷åðíåé ôà-çû ïåðâè÷íûõ ôëþèäíûõ âêëþ÷åíèé èçâåñòåí íà ìíîãèõ ìåñòîðîaeäåíèÿõ è ïðîÿâëåíèÿõ êîðóíäà [11, 15, 19]. Íà îñíîâå ýêñïåðèìåíòàëüíûõ è ðàñ÷åòíûõ äàííûõ ïîñòðî-åíû Ð-Ò-äèàãðàììû ñèñòåìû «äèàñïîð -êîðóíä -âî-äà» (AlO[OH]-Al 2 O 3 -H 2 O) [12, 18], ïîçâîëÿþùèå óñòà-íîâèòü ïàðàìåòðû êðèñòàëëèçàöèè òâåðäûõ ôàç. Îäíàêî ðåçóëüòàòû ýòèõ ýêñïåðèìåíòîâ íåâîçìîaeíî ýêñòðàïîëè-ðîâàòü íà ïðèðîäíûå îáñòàíîâêè, ïîñêîëüêó ïðèðîäíûå ôëþèäû îáîãàùåíû óãëåêèñëîòîé, ìåòàíîì è äðóãèìè êîìïîíåíòàìè, ÷òî âûçûâàåò ñìåùåíèå ðàâíîâåñèÿ «äè-àñïîð -êîðóíä» â íèçêîòåìïåðàòóðíóþ îáëàñòü.Íà ïðèìåðå äèàñïîðà, âïåðâûå îáíàðóaeåííîãî íàìè â êîðóíäàõ çîëîòîðóäíîãî ìåñòîðîaeäåíèÿ Ñóòàðà â êà÷å-ñòâå äî÷åðíåé ôàçû ïåðâè÷íûõ âêëþ÷åíèé [8] CONDITIONS OF FORMATION OF THE DIASPORE IN THE PRIMARY FLUID INCLUSIONS IN CORUNDUM OF THE SUTARA DEPOSIT (RUSSIAN FAR EAST) S. Y. Buravleva, O. V. Avchenko, V. A. Pakhomova FEGI FEB RAS, VladivostokThe data on the composition of primary fluid inclusions in corundum of Sutara deposit were first obtained by Raman spectroscopy using a Horiba LABRAM HR 800 spectrometer. Their primary fluid inclusions contained daughter diaspore crystals, which had not been previously detected in the inclusions of Sutara corundums (Jewish Autonomous Region, Russian Far East). Using Selector software based on thermodynamic calculations reaction:we found that the formation diaspore at CO 2 fluid occurred at a temperature 305 °Ñ and did not depend on pressure. In the H 2 O-CO 2 fluid, the balance of corundum -diaspore shifted in the high temperature section and detected dependence on pressure. Thus, for the known temperature and the composition of H 2 O-CO 2 fluid the diaspore inclusion in corundum may serve as geothermometer. Keywords: corundum; primary inclusions, diaspore, metamorphism, Selector software.ñëóaeèòü ñâîåîáðàçíûì òåðìîáàðîìåòðîì, ïîçâîëÿþùèì âîññòàíîâèòü èñòîðèþ ôèçèêî-õèìè÷åñêèõ óñëîâèé îá-ðàçîâàíèÿ êîðóíäà. Öåëü ðàáîòû -îïðåäåëåíèå óñëîâèé âîçíèêíîâåíèÿ äèàñïîðà. Ãåîëîãè÷åñêàÿ îáñòàíîâêàÐàéîí çîëîòîðóäíîãî ìåñòîðîaeäåíèå Ñóòàðà, ãäå îáíàðóaeåíû êîðóíäîâàÿ ðîññûïü è êîðåííûå ïðîÿâ-ëåíèÿ êîðóíäà -ìàðóíäèòû, íàõîäèòñÿ íà òåððèòî-ðèè Åâðåéñêîé àâòîíîìíîé îáëàñòè è ÿâëÿåòñÿ ÷àñòüþ Ìàëîõèíãàíñêîãî òåððåéíà. Ðàéîí ìåñòîðîaeäåíèÿ õà-ðàêòåðèçóåòñÿ øèðîêèì ðàçâèòèåì ðàííåêåìáðèéñêèõ ìåòàìîðôèçîâàííûõ ãðàôèòîíîñíûõ ãíåéñîâ, êðèñòàë-ëè÷åñêèõ ñëàíöåâ è èçâåñòíÿêîâ, îðäîâèêñêèõ èíòðó-çèé äâóñëþäÿíûõ òóðìàëèíñîäåðaeàùèõ ëåéêîãðàíèòîâ, ñðåäíå-, ïîçäíåêàðáîíîâûõ ãðàíîäèîðèòîâ è ãðàíèòîâ, ñëàãàþùèõ Ñóòàðñêèé ìàññèâ, äàåê ïåãìàòèòîâ (ðèñ. 1).Ìàðóíäèòû -ïîðîäû ñ ñîäåðaeàíèåì êîðóíäà äî 70-90 %, îáðàçóþò ëèíçû è aeèëû íà êîíòàêòå ëåéêîãðà-íèòîâ (ïåãìàòèòîâ) è êðèñòàëëè÷åñêèõ ñëàíöåâ, ñîäåð-aeàùèõ êñåíîëèòû êàðáîíàòíûõ ïîðîä [2,3, 7]. Ðóäû ñî-äåðaeàò ìàðãàðèò, äèàñïîð, ðóòèë, âåðìèêóëèò è ìóñêî-

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Color Genesis and Compositional Characteristics of Color-Change Sapphire from Fuping, China

Huī

Liu

et al. 2022

Crystals

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The color-change sapphire occurs in sillimanite-biotite gneiss in Fuping County Hebei province, China, is one of most famous sapphire deposits in China. However, the color genesis, mechanisms of color changing and compositional characteristics of the sapphire remain enigmatic. In this contribution, the coloration in the Fuping sapphire, color changing mechanisms and, compositional characteristics were studied by conventional gemological instruments in conjunction with ultraviolet-visible spectroscopy and Laser ablation inductively coupled plasma mass spectrometer. The results show that the Fuping sapphire is characterized by purple-blue-to-purple-red changed effect and column-shaped, waist drum-shaped with higher degree of euhedral crystal. Reddish brown rutile inclusions with 120° crossed cleavage are commonly observed. The dominant coloring element of the Fuping sapphire is Fe3+, and subordinate elements are Fe2+, Cr3+ and V3+. The color-change effect is caused by trace elements Cr3+ and V3+. The chemical compositions of Fuping color-change sapphires are analogous to those of metamorphic blue sapphires. When geochemically compared with sapphires from Isalo/Ilakaka deposit in Madagascar, Ratnapura deposit in Sri Lanka and Mogok in Myanmar, the Fuping color-change sapphires have distinctly higher rare element contents of Fe, Cr and Ga.

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Sapphires from the Sutara Placer in the Russian Far East

Cited by 4 publications

References 0 publications

Naryn-Gol Creek Sapphire Placer Deposit, Buryatia, Russia

Naryn-Gol Creek Sapphire Placer Deposit, Buryatia, Russia

Conditions of formation of the diaspore in the primary fluid inclusions in corundum of the Sutara deposit (Russian Far East)

Color Genesis and Compositional Characteristics of Color-Change Sapphire from Fuping, China

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