georesГеоресурсыGeoresources1608-50431608-5078Georesursy LLC10.18599/grs.2023.3.24geores-53Research ArticleГЕОЛОГИЧЕСКИЕ И МИНЕРАЛОГИЧЕСКИЕ ИССЛЕДОВАНИЯ, ПОИСК И РАЗВЕДКА МЕСТОРОЖДЕНИЙ ТВЕРДЫХ ПОЛЕЗНЫХ ИСКОПАЕМЫХGEOLOGICAL AND MINERALOGICAL RESEARCH, PROSPECTING AND EXPLORATION OF SOLID MINERAL DEPOSITSАкцессорная платиноидная минерализация в лерцолитах массива Северный Крака (Южный Урал)Accessory mineralisations in lherzolites of Northern Kraka massif (South Urals)СавельевД. Е.SavelievD. E.

Дмитрий Евгеньевич Савельев – доктор геол.-минерал. наук, главный научный сотрудник, член Отделения наук о Земле и нефтегазовых технологий Академии наук Республики Башкортостан

450077, Уфа, ул. К.Маркса, д. 16/2

Dmitry E. Saveliev – Dr. Sci. (Geology and Mineralogy), Chief Researcher

16/2, K.Marks st., Ufa, 450077

savl71@mail.ruГатауллинР. А.GataullinR. A.

Руслан Азатович Гатауллин – младший научный сотрудник

450077, Уфа, ул. К.Маркса, д. 16/2

Ruslan A. Gataullin – Junior Researcher

16/2, K.Marks st., Ufa, 450077

Институт геологии УФИЦ РАНРоссияInstitute of Geology of the Ufa Federal Research Centre of Russian Academy of SciencesRussian Federation202306042024253208215Copyright © Савельев Д.Е., Гатауллин Р.А., 20242024Савельев Д.Е., Гатауллин Р.А.Saveliev D.E., Gataullin R.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.geors.ru/jour/article/view/53

Описаны находки платинометальной минерализации и распределение элементов платиновой группы в лерцолитах массива Северный Крака. Валовые содержания элементов платиновой группы (ЭПГ) приблизительно на два порядка ниже таковых в хондрите и близки к пиролитовым, относительно которого исследованные лерцолиты обогащены Pd и обеднены Ru. В выделениях минералов платиновой группы (МПГ) установлено присутствие всех ЭПГ (кроме родия) в различных соотношениях. Все выделения подразделяются на три контрастных типа: тугоплавкая триада Os–Ir–Ru, существенно платиновый с участием палладия и палладиево-медный. Практически все найденные зерна МПГ локализованы либо в периферических частях зерен измененных сульфидов (хизлевудит, пентландит), либо в силикатном матриксе в непосредственной близости от сульфидных выделений. На основе установленных минеральных ассоциаций и распределения в них ЭПГ предположен вероятный генезис выделений. Ассоциации Cu–Pd- и Pd–Pt(+Cu)-состава, скорее всего, образовались при кристаллизации сульфидов из экстрагировавшихся частичных расплавов, на что указывают их тесная ассоциация с клинопироксенами и присутствие относительно легкоплавких платиноидов и меди. Ассоциации Pt–Ir- и Os–Ir–Ru(+Pt)-состава, вероятнее всего, являются реститовыми, образованными на месте первичных мантийных сульфидов в результате экстракции более легкоплавких элементов и дальнейшей десульфуризации. Выделение платиноидов в виде собственных минеральных фаз связано с влиянием наложенных низкотемпературных процессов – субсолидусного перераспределения при остывании и последующей серпентинизации.

The findings of platinum group metal mineralization (PGM) and the distribution of platinum group elements (PGE) in lherzolites of the Northern Kraka massif are described. The total contents of PGE are approximately two orders of magnitude lower than those in chondrite and are close to pyrolite, relative to which the studied lherzolites are enriched in Pd and depleted in Ru. In segregations of PGMs, the presence of all PGEs (except rhodium) in various proportions was established. All found grains are divided into three contrasting types: the refractory triad Os–Ir–Ru, essentially platinum with the participation of Pd, and Cu–Pd. Almost all found PGM grains are localized either in the peripheral parts of grains of altered sulfides (heazlewoodite, pentlandite) or in the silicate matrix in the immediate vicinity of sulfide segregations. Based on the mineral associations and PGE distribution, a probable genesis of segregations has been suggested. Associations of Cu–Pd and Pd–Pt(+Cu) composition most likely formed during the crystallization of sulfides from the extracted partial melts. This is indicated by their close association with clinopyroxenes and the presence of relatively fusible platinoids and copper. The associations of Pt–Ir and Os–Ir–Ru(+Pt) composition are most likely restitic, formed in place of primary mantle sulfides as a result of extraction of more fusible elements and further desulphurization. The isolation of platinoids as their own mineral phases is associated with the influence of superimposed low-temperature processes – subsolidus redistribution during cooling and subsequent serpentinization.

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