HYDROTHERMAL-ALTERED ZONING, FLUID CONDITIONS, AND TYPES OF GOLD MINERALIZATION WITHIN THE ELENA AND EMY DEPOSITS OF THE EPITHERMAL SVETLOE ORE DISTRICT (KHABAROVSK TERRITORY)
The relevance of the study is determined by obtaining new data concerning mineral composition, textural and structural features, hydrothermal-metasomatic zoning, fluid regime, and types of gold mineralization of two most contrasting areas of the Svetloe epithermal district (Khabarovsk Territory), fo...
| Published in: | Bulletin of the Tomsk Polytechnic University Geo Assets Engineering |
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| Main Authors: | , , , |
| Format: | Article in Journal/Newspaper |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2021
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| Subjects: | |
| Online Access: | https://doi.org/10.18799/24131830/2021/10/3252 https://doaj.org/article/29e3fcdbcc1346e293a69ac591dd1faf |
| Summary: | The relevance of the study is determined by obtaining new data concerning mineral composition, textural and structural features, hydrothermal-metasomatic zoning, fluid regime, and types of gold mineralization of two most contrasting areas of the Svetloe epithermal district (Khabarovsk Territory), formed in different-aged parent rocks of the Late Cretaceous age (K2) of the Khetanian Formation basic composition in the Cognac-Santonian Stage (d. Emmy) and discordant bedding felsic rocks of the Urak Formation of the Campanian-Maastrichian Stage (d. Elena). The selected objects are characterized by different levels of zone erosion and most fully reflect the diversity of altered rocks of the Svetloe epithermal district. Altered rock represented by weakly altered rocks of the Khetanian Formation within the Emmy deposit and strongly altered, including hypergene processes, acidic rocks prevailing on the territory of the Elena deposit. The data obtained play an important role in establishing the type of epithermal deposits, forecasting mineralization at depth, and can also be used to identify search criteria and features of similar objects both in the Okhotsk-Chukotka volcanic belt and beyond. The aim of this work is to study the hydrothermal-metasomatic zoning, material composition, textural and structural features, fluid regime, as well as the forms of gold occurrence in the Svetloe epithermal ore district using the Emmy and Elena deposits as example. The objects of the study are ores, metasomatites and weakly altered parental rocks in the form of core, ore and chipped samples taken as a result of research work from eight wells and two operating open pits. The rocks were studied by optical and electron microscopy methods using energy dispersive spectroscopy, as well as by X-ray diffraction analysis, microthermometry, and Raman spectrometry. As a result of the studies, it has been established that the altered zoning of the Svetloe epithermal district includes an axial zone of residual quartz with various texture and ... |
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