Geochronology and Ore Mineralization of the Dzheltula Alkaline Massif (Aldan Shield, South Yakutia)
- Authors: Prokopyev I.R.1,2, Kravchenko A.A.3,4, Ivanov A.I.3, Borisenko A.S.1,2, Ponomarchuk A.V.1, Zaitsev A.I.3, Kardash E.A.5, Rozhkov A.A.5
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Affiliations:
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Novosibirsk State University
- Institute of Diamond and Precious Metal Geology, Siberian Branch
- Ammosov Northeastern Federal University
- Yakutskgeologiya Federal State Unitary Mining–Geological Enterprise of the Sakha Republic, Aldan Branch
- Issue: Vol 12, No 1 (2018)
- Pages: 34-45
- Section: Article
- URL: https://journals.rcsi.science/1819-7140/article/view/211347
- DOI: https://doi.org/10.1134/S1819714018010062
- ID: 211347
Cite item
Abstract
The Dzheltula alkaline massif is located in the Tyrkanda ore region of the Chara–Aldan metallogenic zone of the Aldan–Stanovy Shield (South Yakutia). The region contains separate placer gold objects, which are being explored at the present time, and ore-bearing Mesozoic alkaline intrusions, which are weakly studied due to their poor accessibility. The Dzheltula massif (DM) is the largest exposed multiple-ring intrusion within the Tyrkanda ore region; therefore, it is considered as a typical object for geological, petrological, geochronological, and metallogenic studies. The DM consists of five magmatic phases of syenite composition. 40Ar–39Ar dating has established that the crystallization age of the oldest phase, the leucocratic syenite porphyry (pulaskite), is 121.1 ± 1.3 Ma. The crystallization age of the cross-cutting phases represented by syenite–porphyry dikes (laurvikites and pulaskites) ranges from 120.1 ± 2 to 118.3 ± 2.1 Ma. The youngest phase of the massif, trachyte, crystallized at 115.5 ± 1.6 Ma. According to the mineralogical and geochemical studies, two types of ore mineralization, namely gold and uranium–thorium–rare-earth (U–Th–REE), are established within the DM. The gold mineralization was found in the quartz–chlorite–pyritized metasomatites. It is confined to the NNE- and NNW-trending fault zones and coincides with the strike of the syenite porphyry dike belt. Uranium–thorium–rare-earth mineralization has been established in the quartz–feldspathic metasomatites localized in the outer contact of the massif. The juxtaposition of mineralization of different types in some zones of the Dzheltula syenite massif significantly increases the ore potential of the studied object within the Tyrkanda ore region.
About the authors
I. R. Prokopyev
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Author for correspondence.
Email: prokop@igm.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
A. A. Kravchenko
Institute of Diamond and Precious Metal Geology, Siberian Branch; Ammosov Northeastern Federal University
Email: prokop@igm.nsc.ru
Russian Federation, Yakutsk, 677980; ul. Belinskogo 58, Yakutsk, 677000
A. I. Ivanov
Institute of Diamond and Precious Metal Geology, Siberian Branch
Email: prokop@igm.nsc.ru
Russian Federation, Yakutsk, 677980
A. S. Borisenko
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: prokop@igm.nsc.ru
Russian Federation, Novosibirsk, 630090; Novosibirsk, 630090
A. V. Ponomarchuk
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Email: prokop@igm.nsc.ru
Russian Federation, Novosibirsk, 630090
A. I. Zaitsev
Institute of Diamond and Precious Metal Geology, Siberian Branch
Email: prokop@igm.nsc.ru
Russian Federation, Yakutsk, 677980
E. A. Kardash
Yakutskgeologiya Federal State Unitary Mining–Geological Enterprise of the Sakha Republic, Aldan Branch
Email: prokop@igm.nsc.ru
Russian Federation, Aldan, 678900
A. A. Rozhkov
Yakutskgeologiya Federal State Unitary Mining–Geological Enterprise of the Sakha Republic, Aldan Branch
Email: prokop@igm.nsc.ru
Russian Federation, Aldan, 678900