Geichenko M. Geological setting, composition and age of the Pechanovskiy massif's granitoids (The Dniester-Boug and Volyn megablocks junction zone, Ukrainian Shield)

In this manuscript describes Pechanovskiy massif allocated at work on geological mapping 1:50 000 scale. Continued study of the massiv gave a new factual material on the structural features of the geological position magmaticrocksand ost granitoids, the composition of rocks, their petrographic and geochemical characteristics and accessories to a particular complex. Authors is a new factual material for the study of all available outcrops, focused drilling in the contact portion and within the massif, first conducted systematic studies aimed at establishing the entire spectrum of basic petrotypes massif and the host granitoids. From a geological point of view Pechanovsky massif is a part of a homogenized ultrametamorphic modified basement represented different superсrustal rocks (Vasilievka suite, Teterivska series). The findings suggest that certain areas of most homogenized plutonic features acquire homogeneous character and creates the possibility of intrusion servings anatektoidic melt. This gives paraautochthonous signs to the granitoids. As a result of researches we are established (isochronous uranium-lead method) in the tonalites radiological zircon's age (2076,7 ± 6,2) Ma, clarified composition, volume and semantic content of the Sheremetyevo granitoids complex. Radiological age of the ultrametamorfic biotite plagiogneisses of the Vasilevska suite that were largely homogeneous source of the Pechanivsky massif granitoids - (2104,7 ± 6) Ma (zircon) and age of the postmagmatic transformation products the ultrametamorfic anatektoidic melt mobilization - (2045,1 ± 5) Ma (monazite). Refined metallogenic specialization of granitoid massif in zones of abnormal heat/ fluid streams in the areas among contact of the blocks. Granitoids characterized by pronounced rare-metallogenic specialization and spatial control the perspective molybdenum, lithium, and germanium targets. The author - the first discoverer the diopside-spodumene pegmatites, which are the primary exploration targets in the region.