On the nature of ore-bearing fluids on the Dal’negorskoe borosilicate deposit (Primor’e)

Study of the oxygen isotopic composition in highpotassic rocks of preore magmatic bodies from thezones of pay datolite mineralization in skarns of theDal’negorskoe borosilicate deposit allowing us torefine the nature of oreforming fluids was undertakenfor the first time. The concepts on the relationshipsbetween datolite mineralization with magmas of alkaline basaltic chambers and parental juvenile fluids prevailed in special publications [1–4]. As this took place,high and ultrapotassic magmatic bodies usuallycalled trachyte or latite were considered as late orebearing phases of the alkaline basaltic chamber. However, mineralogical and geochemical investigations ofthese rocks [5] demonstrated that these were preoredykes of Paleogene basalt intruded in the zone of afluid canal, so oreforming solutions modified basaltsto a state of highpotassic rocks. Alteration was carriedout by aqueous fluids enriched in Ba, K, B, and Rband depleted in lowsoluble elements, namely Zr, Nb,Ta, La, and Ce. The estimations of oxygen isotopeshifts and their correlations in pre and postore igneous rocks of the deposit obtained in this study confirmthese assumptions.The Dal’negorskoe deposit (44°34