High-titanium dolerites as a new criterion for the kimberlite prospecting
https://doi.org/10.31242/2618-9712-2022-27-4-499-513
Abstract
The generalization of data on the chemical composition of dolerites of the Vilyui-Markha dike swarm (Vilyui paleorift) made it possible to identify geochemically anomalous areas among them. We found that the amount of TiO2 and a number of highly charged and rare earth elements (Th, Ta, Hf, Y, Nb, REE) practically doubled in the dolerites of dikes located near kimberlite pipes. Moreover, a similar behavior of elements was observed in the dolerites of dikes located near the kimberlites of the Kuoyk field (Molodo dike swarm, Olenek paleorift). Therefore, we conclude that there is a paragenetic relationship between the increase in the content of titanium and rare earth elements in dolerites and kimberlites. We assume that protokimberlites indirectly influenced the tholeiite melt at the time of its melting, which led to local enrichment of the tholeiite melt with refractory components. Weakly manifested processes of geochemical alignment between high-Ti and ordinary basites ensured the locality of the distribution of the former. The kimberlites that penetrated after the basites were located near the dikes of high-titanite dolerites. Thus, the high-Ti dolerites of the dike swarms can be used as one of the criteria for the kimberlites prospecting. Considering the above, two new sections have been allocated within the Vilyui-Markha dike swarm: Tenkelyakh and Kyulyanke, with prospective for the discovery of kimberlites here. We also assume that protokimberlites indirectly influenced the tholeiite melt at the time of its melting, which led to local enrichment of the tholeiite melt in refractory components. Weakly manifested processes of geochemical alignment between high-Ti and ordinary mafic rocks ensured the local distribution of the former. The kimberlites in truded after the basites were located near the dikes of high-Ti dolerites. Thus, high-Ti dolerites of dike belts can be used as one of the search criteria for kimberlites. Finaly two new sites have been identified within the Vilyui-Markhin dike belt: Tenkelyakhsky and Kyulyankinsky, both promising for the discovery of kimberlites here.
Supporting agencies: This study was carried out within the framework of the State Assigment to the DPMGI SB RAS and the RNF project (regional competition) № 22-27-20151.
About the Authors
M. D. Tomshin
Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
TOMSHIN, Mihail Dmitrievich, Cand. Sci (Geology and Mineralogy), Leading Researcher, Head of the Laboratory
39 Leninа pr., Yakutsk 677980
S. S. Gogoleva
Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
GOGOLEVA, Sargylana Semenovna, Leading Engineer of the Laboratory
39 Leninа pr., Yakutsk 677980
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Review
For citations:
Tomshin M.D., Gogoleva S.S. High-titanium dolerites as a new criterion for the kimberlite prospecting. Arctic and Subarctic Natural Resources. 2022;27(4):499-513. (In Russ.) https://doi.org/10.31242/2618-9712-2022-27-4-499-513
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