Observational analysis reveals interrupted reverse zoning in picritic gabbro-dolerites, suggesting a complex magmatic system involving rare earth elements.
The original data illustrating the phenomenon of reverse zoning in picritic gabbro-dolerites of the Talnakh intrusion are presented. Based on the distribution of petrogenic and rare earth elements, a sharp geochemical boundary and differently directed trends in the evolution of the magmatic system for picritic gabbro-dolerites and overlying rocks of the main layered series are shown. For the first time, a new subtype of interrupted reverse zoning is revealed for layered intrusions, with the most primitive composition in the upper part of the picritic gabbro-dolerites and a more fractionated composition in the lower part of the main layered series. It is shown that picritic gabbro-dolerites cannot be the lower part of the main layered series during fractionation «in situ» and be formed within the framework of a single mechanism.
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I. A. Kuz’min (2025) studied this question.
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