litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistrylitosphere-59Research ArticleСтатьиArticlesХимический и изотопный состав Os-содержащих сплавов и сульфидов золоторудного поля Эвандер Витватерсрандского бассейна (Южная Африка)Chemical and isotopic composition of Os-rich allois and sulfides from the Evander Goldfield of the Witwatersrand Basin (South Africa)БаданинаИнна ЮрьевнаBadaninaI. Yu.dunite@yandex.ruМаличКрешимир НенадовичMalitchK. N.noemail@neicon.ruМерклеРоланд К.MerkleR. K.noemail@neicon.ruАнтоновАнтон ВладимировичAntonovA. V.noemail@neicon.ruКапитоновИгорь НиколаевичKapitonovI. N.noemail@neicon.ruХиллерВера ВитальевнаKhillerV. V.noemail@neicon.ruИнститут геологии и геохимии УрО РАНРоссияInstitute of Geology and Geochemistry, Urals Branch of RASRussian FederationУниверситет ПреторииРоссияUniversity of PretoriaRussian FederationВсероссийский научно-исследовательский геологический институтРоссияRussian Geological Research Institute (VSEGEI)Russian Federation20162812201606129144Copyright © Баданина И.Ю., Малич К.Н., Меркле Р.К., Антонов А.В., Капитонов И.Н., Хиллер В.В., 20162016Баданина И.Ю., Малич К.Н., Меркле Р.К., Антонов А.В., Капитонов И.Н., Хиллер В.В.Badanina I.Y., Malitch K.N., Merkle R.K., Antonov A.V., Kapitonov I.N., Khiller V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/59

Впервые охарактеризованы вещественные и изотопно-геохимические особенности Ru-Os-Ir сплавов, Ru-Os сульфидов и поликомпонентных твердых растворов системы Ru-Os-Ir-Pt(+-Fe) из конгломератной формации Кимберли золоторудного поля Эвандер Витватерсрандского бассейна (Южная Африка). Для исследования платиноидной минерализации применен комплекс методов, включающий рентгеноспектральный микроанализ, лазерную абляцию и масс-спектрометрию с ионизацией в индуктивносвязанной плазме. Новые результаты свидетельствуют в пользу: 1) высокотемпературного образования изученных минералов платиновой группы (МПГ); 2) субхондритового архейского источника рудного вещества; 3) сходства начального изотопного состава осмия в сосуществующих Os-содержащих сплавах и сульфидах в составе полиминеральных ассоциаций; 4) значительных Os -изотопных вариаций в индивидуальных Ru-Os-Ir сплавах, Ru-Os сульфидах и поликомпонентных твердых растворах системы Ru-Os-Ir-(+-Fe). Предложена возможность использования 187Os/188Os возрастов МПГ для разбраковки существующих моделей образования благороднометалльной минерализации Витватерсрандского бассейна.

We firstly report compositional and isotope-geochemical characteristics of Ru-Os-Ir(-Pt) alloys, Ru-Os sulfides and polycomponent solid solutions of the system Ru-Os-Ir-Pt (±Fe) derived from the Kimberley Reef within Evander Goldfield of the Witwatersrand Basin (South Africa). The study employed electron microprobe analysis and laser ablation attached to multiple collector inductively coupled plasma mass spectrometry. The obtained results are consistent with: 1) high-temperature formation of the studied platinum-group minerals, 2) sub- hondritic Archean source of platinum-group elements, 3) similarity of the initial Os-isotope composition in coexisting Os-rich alloys and Ru-Os sulfides and 4) significant Os-isotope variations in individual Ru-Os-Ir alloys, Ru-Os sulfides and polycomponent solid solutions of the Ru-Os-Ir-Pt (±Fe) system. 187Os/188Os ages are used to discriminate between different models of noble metal mineralization origin within the Witwatersrand basin.

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The authors declare that there are no conflicts of interest present.