litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2022-22-5-644-666litosphere-1730Research ArticleСтатьиArticlesAu-Pd минерализация и рудообразующие флюиды месторождения Блейда Фар Вест (Анти-Атлас, Марокко)Au-Pd mineralization and ore-forming fluids of the Bleïda Far West deposit (Anti-Atlas, Morocco)КалининЮ. А.KalininYu. A.

630090, г. Новосибирск, просп. Акад. Коптюга, 3

Yuri A. Kalinin

3 Acad. Koptyug Av., Novosibirsk 630090

БоровиковА. А.BorovikovA. A.

630090, г. Новосибирск, просп. Акад. Коптюга, 3

Andrey A. Borovikov

3 Acad. Koptyug Av., Novosibirsk 630090

MaachaL.MaachaL.

Tour A, Angle Boulevards Zerktouni and Al Massira Al Khadra BP 5199, Casablanca

Tour A, Angle Boulevards Zerktouni and Al Massira Al Khadra BP 5199, Casablanca

ZuhairM.ZuhairM.

Tour A, Angle Boulevards Zerktouni and Al Massira Al Khadra BP 5199, Casablanca

Tour A, Angle Boulevards Zerktouni and Al Massira Al Khadra BP 5199, Casablanca

ПальяноваГ. А.PalyanovaG. A.

630090, г. Новосибирск, просп. Акад. Коптюга, 3

Galina A. Palyanova

3 Acad. Koptyug Av., Novosibirsk 630090

ЖитоваЛ. М.ZhitovaL. M.

630090, г. Новосибирск, просп. Акад. Коптюга, 3

Lyudmila M. Zhitova

3 Acad. Koptyug Av., Novosibirsk 630090

Институт геологии и минералогии СО РАНРоссияV. S. Sobolev Institute of Geology and Mineralogy SB RASRussian FederationManagem Group, Twin CenterМароккоManagem Group, Twin CenterMorocco202204112022225644666Copyright © Калинин Ю.А., Боровиков А.А., Maacha L., Zuhair M., Пальянова Г.А., Житова Л.М., 20222022Калинин Ю.А., Боровиков А.А., Maacha L., Zuhair M., Пальянова Г.А., Житова Л.М.Kalinin Y.A., Borovikov A.A., Maacha L., Zuhair M., Palyanova G.A., Zhitova L.M.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/1730Объект исследований

Объект исследований. Убогосульфидное Au-Pd оруденение месторождения Блейда Фар Вест, представленное необычной ассоциацией палладистого золота и минералов системы Pd-Bi-Se, а также серебристого золота и минералов системы Pd-Bi-Te. Месторождение локализовано в неопротерозойских вулканических породах центрального Анти-Атласа (Марокко).

Методы

Методы. Химический анализ минералов проводился в ЦКП многоэлементных и изотопных исследований СО РАН (г. Новосибирск, Россия) методом электронно-зондового микроанализа (EPMA). Флюидные включения изучены с помощью методов криометрии и гомогенизации с использованием микротермокамеры THMSG-600. Состав газовой фазы и определение твердых фаз включений проводилось методом КР-спектроскопии. Качественный химический состав солей флюидных включений определялся методом EPMA.

Основные результаты и выводы. В ассоциации с палладистым золотом обнаружены минералы системы Pd-Bi-Se, ранее не известные в рудах Блейды: остербошит (Pd, Cu)7Se5, палладсеит (Pd17Se15), падмаит PdBiSe, (Au,Ag)Se, самородный селен, а также ряд неидентифицированных фаз – Pd2BiSe, Pd3BiSe, Pd4BiSe и Pd5BiSe. Согласно данным исследования флюидных включений в кварце и кальците, Au-Pd минерализация образовалась при температуре от 384 до 75°С при участии гомогенных или гетерофазных CaCl2-NaCl высокосоленых гидротермальных растворов на глубине 2.8–2.7 км. Высказывается предположение, что палладистое золото и минералы системы Pd-Bi-Se были образованы в условиях, близких к условиям образования Au-Pd месторождений Бразилии, а серебристое золото и минералы системы Pd-Bi-Te могли образоваться в условиях подобных, но не тождественных, условиям образования Au-Pd низкотемпературной минерализации на порфировых месторождениях с примесями Pd и без Pd.

Research subject

Research subject. Au-Pd mineralization of the Bleïda Far West deposit, represented by an unusual association of palladium gold, minerals of the Pd-Bi-Se system, as well as silvery gold and minerals of the Pd-Bi-Te system. The deposit is localized in the Neoproterozoic volcanic rocks of the central Anti-Atlas (Morocco).

Methods

Methods. A chemical analysis of minerals was carried out at the Center for Collective Use of Multielement and Isotopic Studies of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk, Russia) using the electron probe microanalysis (EPMA) method. Fluid inclusions were studied using cryometry and homogenization using a THMSG-600 microthermochamber. The composition of the gas phase and the determination of the solid phases of the inclusions were carried out by Raman spectroscopy. The qualitative chemical composition of fluid inclusion salts was determined by the EPMA method.

Results and conclusions

Results and conclusions. It is suggested that palladium gold and minerals of the Pd-Bi-Se system were formed under the conditions close to those during the formation of Au-Pd infiltration deposits in Brazil, while silvery gold and minerals of the Pd-Bi-Te system could be formed under the conditions similar, but not identical, to the formation conditions of Au-Pd low-temperature mineralization in porphyry deposits. According to the study of fluid inclusions in quartz and calcite, Au-Pd mineralization was formed at temperatures from 384 to 75°C with the participation of homogeneous or heterophasic CaCl2-NaCl highly saline hydrothermal solutions at a depth of 2.8–2.7 km. Minerals of the Pd-Bi-Se system, previously unknown in Bleïda Far West ores, were found in association with native gold: osterboshite (Pd, Cu)7Se5, paladsite (Pd17Se15), (Au,Ag)Se, padmaite PdBiSe, native Se, as well as a number of unidentified phases – Pd2BiSe, Pd3BiSe, Pd4BiSe and Pd5BiSe.

Au-Pd месторождениясамородное золото (с примесями Pd и без Pd)минералы платиновых металлов (МПМ)флюидные включенияAu-Pd depositsnative gold (with and with out Pd)PGM mineralsfluid inclusionsРабота выполнена по государственному заданию ИГМ СО РАН, а также при поддержке Российского фонда фундаментальных исследований (проект № 20-05-00393). Авторы выражают искрению благодарность уважаемым В.И. Титову и С.Н. Звереву за неоценимую помощь в проведении исследовательских работ на месторождении Блейда Фар Вест.Work is done on state assignment of IGM SB RAS, and with the support of the Russian Foundation for Basic Research (project No. 20-05-00393). The authors sincerely express their gratitude to the esteemed V.I. Titov and S.N. Zverev, whose help in carrying out research work at the Blade Far West field was invaluable.ReferencesБорисенко А.С., Боровиков А.А., Поспелова Л.Н. (1994) Исследование состава растворов флюидных включений методами криометрии и микрорентгеноспектрального анализа. 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The authors declare that there are no conflicts of interest present.