The Cr6+ impurity in supergene oxosalts in chromate mineralization occurrences of the Urals
- Authors: Khanin D.A.1, Pekov I.V.1, Pakunova A.V.1, Ekimenkova I.A.1, Yapaskurt V.O.1
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Affiliations:
- Department of Geology
- Issue: Vol 71, No 5 (2016)
- Pages: 330-336
- Section: Article
- URL: https://journals.rcsi.science/0145-8752/article/view/174296
- DOI: https://doi.org/10.3103/S0145875216050070
- ID: 174296
Cite item
Abstract
Based on the results of more than 600 electron microprobe analyses of 25 minerals the distribution pattern of the Cr6+ impurity in vanadates, phosphates, and arsenates collected in oxidation zones of six ore deposits of the Urals was studied. Among them are Pb minerals of the brackebuschite, apatite, adelite, and tsumcorite groups and alunite supergroup, as well as carminite, cornwallite, and bayidonite. Vanadates and arsenates with brackebuschite-type structures show a high affinity to Cr6+. The maximum content of the Cr6+ impurity is characteristic of minerals with specified Fe3+ trivalent cations (ferribushmakinite, arsenbrackebuschite, and gartrellite) or Al3+ (plumbogummite and bushmakinite). The prevailing scheme of isomorphous substitution, according to which chromium enters into the compositions of these minerals, is heterovalent: Cr6+ + M2+ → Т5+ + M3+ (where Т = V, As, P; M3+ = Fe, Al; M2+ = Сu, Zn), whereas the role of isovalent substitutions Cr6+ → S6+ and Cr6+ → Mo6+ in oxosalts that formed in mineral occurrences of the Urals is insignificant.
About the authors
D. A. Khanin
Department of Geology
Author for correspondence.
Email: mamontekok49@yandex.ru
Russian Federation, Moscow
I. V. Pekov
Department of Geology
Email: mamontekok49@yandex.ru
Russian Federation, Moscow
A. V. Pakunova
Department of Geology
Email: mamontekok49@yandex.ru
Russian Federation, Moscow
I. A. Ekimenkova
Department of Geology
Email: mamontekok49@yandex.ru
Russian Federation, Moscow
V. O. Yapaskurt
Department of Geology
Email: mamontekok49@yandex.ru
Russian Federation, Moscow