| Annotation |
For the first time a comparative study of the ratio of oxygen isotopes in chalcedony quartz veins of gold ore field Baley and chalcedony from tonsils Jurassic-Cretaceous paleovolcanoes, formed at different depths from paleosurface has been carried out. Baley ore field is represented by two gold-silver epithermal deposits: the actual Baleyskoye and Tasey. They are different blocks of the same ore-magmatic system. The Baley is an uplifted block of the ore zone, the upper part of which is eroded. It was found that the maximum values of δ18O characterized opal and chalcedony tonsils of Jurassic-Cretaceous volcanic which possess clearly magmatic nature, in which the proportion of light oxygen is low (δ18O = +14,2 ÷ + 10,9 ‰). Transient values (δ18O = +10,5 ÷ + 7,4 ‰) are typical for opalite and opal-chalcedony formations near the surface and the upper parts of over ore zone I of the Tasey ore deposit containing gold zone within the 0,168…38,9 g/t. For productive chalcedony quartz ore zone horizon at a depth of 266 m containing 41,2…1230 g/t gold, the proportion of the heavier isotope decreases sharply (δ18O = + 1,7 ‰). The samples of fine-grained, columnar, plate-quartz vein of the Baley deposit have a different minimum, including negative values share δ18O (+0,8 ÷ -2,6 ‰). The revealed unidirectional increase with the depth of the fraction of the light isotope of oxygen in quartz confirms the existing vertical mineralogical and temperature zonation of mineralization.
|
| References |
References
1. Baskina V. A., Dubinina E. O., Avdeenko A. C. Doklady Rossiyskoy akademii nauk (Reports of the Russian Academy of Sciences), 2011, Vol. 436, no. 3, pp. 363–367.
2. Bortnikov N. S., Gamyanin G. N., Vikentyeva O. V., Prokofiev V. Yu., Alpatov V. A., Bakharev A. G. Geologiya rudnyh mestorozhdeniy (Geology of ore deposits), 2007, vol. 49, no. 2, pp. 99–145.
3. Goryachev N. A., Vikentyeva O. V., Bortnikov N. S., Prokofiev V. Yu., Alpatov V. A., Golub V. V. Geologiya rudnyh mestorozhdeniy (Geology of ore deposits), 2008, vol. 50, no. 5, pp. 414–444
4. Ikonnikova T. A., Dubinina E. O., Saroyan M. R., Chugaev A. V. Geologiya rudnyh mestorozhdeniy (Geology of ore deposits), 2009, vol. 51, no. 6, pp. 560-567.
5. Kryazhev S. G. Geneticheskie modeli i kriterii prognoza zolotorudnyh mestorozhdeniy v uglerodisto-terrigennyh kompleksah: avtoref. dis. … d-ra geol.-miner. nauk: 25.00.11 (Genetic models and forecast criteria for gold deposits in carbon-terrigenous complexes: abstract. dis. ... dr. geol.-miner. sciences: 25.00.11). Moscow, 2017, 52 p.
6. Savva N. E. Mineralogiya serebra Severo-Vostoka (Mineralogy of silver of the North-East). Moscow: Triumph, 2018. 554 p.
7. Spiridonov A. M., Zorina L. D., Kitaev N. A. Zolotonosnye rudno-magmaticheskie sistemy Zabaykaliya (Gold-bearing ore-magmatic systems of Transbaikalia). Novosibirsk: GEO, 2006. 291 p.
8. Yurgenson G. A. Uchenye zapiski Zabaykalskogo gosudarstvennogo gumanitarno-pedagogicheskogo universiteta. Seriya “Estestvennye nauk” (Scientific Notes of the Transbaikal State Humanitarian and Pedagogical University. Series “Natural Sciences”), 2011, no 1, pp. 136–145.
9. Yurgenson G. A. Tipomorfizm i prognoz zolotoserebryanogo orudeneniya (Typomorphism and forecast of gold-silver mineralization). Chita: Transbaikal State University, 2014. 170 p.
10. Kerrich R. Short Course Handbook (Short Course Handbook), 1987, Vol. 13, pp. 287–336.
11. Pokrovski G. S., Borisova A. Y., Akinfiev N. N., Zotov A. V., Kousmanov K. Geological Society. Special Publications (Geological Society. Special Publications), 2014, vol. 402, no. 1, pp. 9–70.
12. Sharp Z. D. A. Geochimica et Cosmochimica Acta (Geochimica et Cosmochimica Acta), 1990, vol. 54, no. 5, pp. 1353–1357.
13. Taylor B. E. Stable Isotope Geochemistry of Low Temperature Processes (Stable Isotope Geochemistry of Low Temperature Processes). Michigan, 1987, pp. 337–445.
14. Taylor H. P. Geochemistry of Hydrothermal Ore Deposits (Geochemistry of Hydrothermal Ore Deposits). New York: John Wiley & Son, 1979, pp. 235–277.
|
