gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-5-0782XYEZHTgtcrust-1918Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSПОИСК КОРЕННЫХ ИСТОЧНИКОВ ГИГАНТСКИХ CLIPPIR АЛМАЗОВ НА СЕВЕРЕ ЯКУТИИ МЕТОДОМ МИНЕРАЛОГО-ГЕОХИМИЧЕСКОЙ АНАЛОГИИ (МЕТОД 5Е ДИАГРАММ)PREDICTION OF THE PRIMARY SOURCES OF GIANT CLIPPIR DIAMONDS IN THE NORTH OF YAKUTIA BY THE METHOD OF MINERALOGICAL AND GEOCHEMICAL ANALOGY (METHOD 5E DIAGRAMS)https://orcid.org/0000-0002-8258-5967ИвановА. С.IvanovA. S.

199106, Санкт-Петербург, Васильевский остров, 21 линия, 2

2 21st Line, Saint Petersburg, 199106

ЗинченкоВ. Н.ZinchenkoV. N.

Луанда

Luanda

https://orcid.org/0000-0003-3985-7661АщепковИ. В.AshchepkovI. V.

630090, Новосибирск, пр-т Академика Коптюга, 3 

670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия 

3 Academician Koptyug Ave, Novosibirsk 630090

6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia

https://orcid.org/0000-0002-4806-7744БабушкинаС. А.BabushkinaS. A.

677007, Якутск, пр-т Ленина, 39, Республика Саха (Якутия) 

39 Lenin Ave, Yakutsk 677007, Republic of Sakha (Yakutia)

ssta@list.ruhttps://orcid.org/0000-0003-1010-7592ОлейниковО. Б.OleinikovO. B.

677007, Якутск, пр-т Ленина, 39, Республика Саха (Якутия) 

39 Lenin Ave, Yakutsk 677007, Republic of Sakha (Yakutia)

https://orcid.org/0009-0000-1564-7251ШелковП. Н.ShelkovP. N.

111674, Москва, ул. Липчанского, 2

2 Lipchansky St, Moscow 111674

Санкт-Петербургский горный университетРоссияSaint Petersburg Mining UniversityRussian FederationГорно-рудное общество КАТОКААнголаCATOCA Mining Society LLCAngolaИнститут геологии и минералогии им. В.С. Соболева СО РАН ; Геологический институт им. Н.Л. Добрецова СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences ; Dobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии алмаза и благородных металлов СО РАНРоссияDiamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationООО «Алмазы Заполярья»РоссияAlmazy Zapolyarya LLCRussian Federation202418102024155782782Copyright © Иванов А.С., Зинченко В.Н., Ащепков И.В., Бабушкина С.А., Олейников О.Б., Шелков П.Н., 20242024Иванов А.С., Зинченко В.Н., Ащепков И.В., Бабушкина С.А., Олейников О.Б., Шелков П.Н.Ivanov A.S., Zinchenko V.N., Ashchepkov I.V., Babushkina S.A., Oleinikov O.B., Shelkov P.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1918

Находки в россыпях бассейна р. Эбелях (север Якутии) гигантских алмазов CLIPPIR типа предполагают, что подобные алмазы могут быть найдены в кимберлитовых полях Анабарского региона и ближайших северных месторождениях, расположенных в пределах коллизионных Хапчанского и Далдынского террейнов. Для прогнозирования находок подобных алмазов авторы используют метод 5E диаграмм. Он основан на оценке схожести составов пяти окислов минералов-спутников алмаза с эталонными диаграммами для трубки Карове (К-6, Ботсвана) с составом таковых для любой другой трубки. Ранее было показано, что сходимость составов минералов-спутников алмаза трубок Карове и им. В. Гриба (Архангельская алмазная провинция) составляет 74 %, что может расцениваться как показатель возможного нахождения в трубке CLIPPIR алмазов. Применение этой методики к двум кимберлитовым трубкам Анабарского региона продемонстрировало, что вероятность обнаружения подобных алмазов в трубке Ленинград (нижний девон, убого алмазоносная) составляет 74 %, а в трубке Малокуонамской (нижний триас, полупромышленная алмазоносность) – 20 %. Сопоставление диаграмм 5E и дополнительных диаграмм PTX – fO2 реконструированных разрезов субкратонной литосферной мантии показало их совместную эффективность для прогнозирования благоприятных условий кристаллизации CLIPPIR алмазов. Предполагается, что образование подобных алмазов может происходить внутри протокимберлитового магматического очага, расположенного вблизи границы литосферы и связанного с астеносферным источником. Он должен быть окружен низкоокисленными мантийными эклогитами, богатыми углеродом, и дунитами с высоким давлением и температурой, а также богатыми магнием ильменит-хромитовыми метасоматитами. Применение метода 5Е диаграмм как способа прогнозирования гигантских СLIPPIR алмазов в слабоалмазоносных кимберлитах может привлечь инвестиции в геологоразведочные работы по аудиту промышленного потенциала целого ряда таких кимберлитов в Анабарском регионе. Его реализация может существенно повысить эффективность геологоразведки и оценки потенциала слабоалмазоносных трубок, которые были законсервированы как непромышленные.

The finds of giant CLIPPIR-type diamonds in the placers hosted by the Ebelyakh River basin in the north of Yakutia suggest that similar diamonds can be found in the kimberlites of the Anabar region and the nearest northern deposits located within the collisional Khapchan and Daldyn terranes. To predict the discovery of such diamonds, the authors use the 5E diagram method based on the principle of similarity of the compositions of five oxides of satellite minerals (Grt, Cpx, Chr and Ilm) of diamond (DSM) with the reference diagrams for the Karowe pipe (K-6, Botswana) with the composition of those for any other pipe. It was previously shown that the convergence of the DSM compositions of the Karowe and V. Grib (Arkhangelsk diamond province) pipes is 74 %, which might indicate possible presence of CLIPPIR diamonds in the predicted pipe. The application of this technique to two kimberlite pipes of the Anabar region demonstrated that the probability of detecting such diamonds in the Leningrad pipe (Lower Devonian, medium diamond content potential) is 74 %, and in the Malokuonamskaya pipe (Lower Triassic, medium diamond content) is 20 %. A comparison of diagrams 5E and additional PTС – fO2 diagrams of reconstructed sections of the lithospheric mantle showed their efficiency in predicting favorable conditions of CLIPPIR-type diamond crystallization. It is assumed that formation of such diamonds may occur within the proto-kimberlite magmatic chamber located near the boundary of the lithosphere and associated with the asthenospheric source. It should be surrounded by low-oxidized carbon-rich mantle eclogites and dunites with high pressure and temperature, as well as magnesium-rich ilmenite-chromite metasomatites. The use of the 5E diagram method, as the approach to predict giant CLIPPIR diamonds in poorly diamondiferous kimberlites, might attract investing for exploration to audit the industrial potential of a series of such kimberlites in the Anabar region. Its implementation would significantly increase the efficiency of geological exploration and assessment of the potential of poorly diamondiferous pipes that have been suspended as subeconomic.

Анабарский щиткимберлитыгеохимия минералов-спутников алмаза5E диаграммамономинеральная термобарометриясодержание алмазовразрез литосферной мантииAnabar shieldkimberlitesgeochemistry of diamond satellite minerals5E diagrammonomineral thermobarometrydiamond gradelithospheric mantle sectionИсследование выполнено при поддержке Минобрнауки РФ по государственным заданиям ИГМ СО РАН, г. Новосибирск (проекты 122041400193-7 и 122041400237-8); ИГАБМ СО РАН (проект FUFG-2024-0007), г. Якутск; ГИ СО РАН, г. 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The authors declare that there are no conflicts of interest present.