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Geo-petrological model for the formation of diamond-bearing fluid-explosive breccia structures (Ural type)

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Аннотация

The geo-petrological model of diamond-bearing fluid-explosive breccia formations constitutes a well-structured system of features that are typical of several similar formations in the Cis-Ural and West Ural areas of the Perm Territory. The model reflects a number of basic common factors associated with the morphology of these structures, their rock composition and the conditions for their formation. In this paper, the authors characterise regional and local geological positions featuring diamond-bearing formations, as well as the parameters common for the areas of their development. The necessity of mineralogical and geochemical studies of black sand, while prospecting for diamond-bearing targets is highlighted. This will help identify specific mineral associations and geochemical anomalies typical of these widespread formation areas. The description of a geological structure associated with the best-studied deposit (Efimovsky) is given in detail. The description of this deposit is used as an example to illustrate the shape of breccia bodies and their polyphase structure, as well as show their texture and rock structure specifics. Special attention is paid to the petrographic characteristics of all kinds of fluid-explosive breccias, which to a different extent contain clastic, protomagmatic and newly formed fluidogenic material. The paper gives the characteristics and specifics of mineral grains of various origin, many of which are abundant in gas-liquid inclusions characterised by block extinction, while quartz possess planar elements. The authors examined the differences in the diamond potential of rocks belonging to different successive evolution phases of fluidogenic breccia formations. When studying newly discovered breccia structures that have a limited number of features, the model considered in the paper will help to predict the missing features and assessment criteria for diamond potential.

Об авторах

L. N. Sharpenok
A.P. Karpinsky Russian Geological Research Institute (VSEGEI)
Россия

Lyudmila N. Sharpenok

74 Sredny ave., Vasilyevsky Island, St.Petersburg, 199106



L. I. Lukianova
A.P. Karpinsky Russian Geological Research Institute (VSEGEI)
Россия

Lyudmila I. Lukianova

74 Sredny ave., Vasilyevsky Island, St.Petersburg, 199106



O. V. Petrov
A.P. Karpinsky Russian Geological Research Institute (VSEGEI)
Россия

Oleg V. Petrov

74 Sredny ave., Vasilyevsky Island, St.Petersburg, 199106



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Для цитирования:


Sharpenok L.N., Lukianova L.I., Petrov O.V. Geo-petrological model for the formation of diamond-bearing fluid-explosive breccia structures (Ural type). Литосфера. 2018;18(5A):78-89.

For citation:


Sharpenok L.N., Lukianova L.I., Petrov O.V. Geo-petrological model for the formation of diamond-bearing fluid-explosive breccia structures (Ural type). LITHOSPHERE (Russia). 2018;18(5A):78-89.

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ISSN 1681-9004 (Print)
ISSN 2500-302X (Online)