U-Pb ?????????????? ?????????????????????????????????? ???????????????? ???????????????????????? ?????????????? ???????????????????????????? ?????????? (???????????????????????????????????????? ???????????????? ?????????????????????? ????????)
U-Pb ?????????????? ?????????????????????????????????? ???????????????? ???????????????????????? ?????????????? ???????????????????????????? ?????????? (???????????????????????????????????????? ???????????????? ?????????????????????? ????????)
??????????????????????, ?????? ?????????????????????????????????? ?????????????? ???????????????????????? ?????????????? ???????????????????????????? ?????????? ???????????????? ???????????????? ???????????????? ???????????????? ?????????????????? ?? ???????????????????????????????????????? ????????????-???????????????????????????? ??????????????. ???? U-Pb ?????????????? ???? ???????????????? ??? 2985 ?????? ??????. ?????? ???????????? ???? ???????????????? ?? ?????????????????????? ???????????????????????????? ?????????????????? (3014 ?? 7) ?? ???????????????????????????? ?????????????????????????????????? ?????????????????? (2972 ?? 6 ?????? ??????) ???? ?????????????????????????? ??????????, ?????? ?????????????????? ???? ???? ???????????????????????? ?? ?????????????? ?????????????????? ?????????????????? ??????????????, ????????????????, ???????????????????? ?????????????? ?????????? ?????????? 3000 ?????? ?????? ???????? ??????????. ???????????????????????????????? ???????????????????????? ?? ???????????????????? ???????????????????? ?????????????????? ???????????????????? ??????????????????, ?? ?????????????????????????????????? ?????????????? ??? ?????? ?????????????????? ?????????????????? ?????????? ?????????????? ?????????????? ????????????????????.
??????????????????????, ???? ?????????????????????????????????? ?????????????? ?????????????????????????? ???????????? ?????????????????????????????? ?????????? ?? ???????????????? ?????????????? ???????????????? ?????????????????? ?? ???????????????????????????????????????????????? ????????????-??????????????????'?????????? ??????????????. ???? U-Pb ?????? ???? ?????????????????? ??? 2985 ?????? ??????????. ???????? ?????????????? ???? ?????????? ?? ?????????????????????? ?????????????????????????????? ?????????????????? (3014 ?? 7) ?? ???????????????????????????? ???????????????????????????????????? ?????????????????? (2972 ?? 6) ?????? ?????????? ???? ?????????????????????????????? ??????????, ???? ???????????? ???? ???? ???????????????????? ???????????????? ?????????????????? ?????????????????? ????????, ????????????????, ?????????????????? ???????????????????? ?????????? ?????????????? 3000 ?????? ?????????? ????????. ???????????????????????????????? ???????????????????? ?? ???????????????????? ???????????????????? ?????????????????? ???????????????????? ??????????????????, ?? ?????????????????????????????????? ?????????????? ??? ?? ?????????????? ???????????????????? ?????????????????? ?????????? ???????????? ?????????????? ????????????????????.
It is determined, that two-feldspar granites of the Vishnevoe massif of the Slavgorod block are the most ancient crustal granites in the Middle-Dnieper granite-greenstone terrane. Their isotopic age for monazite ??? 2985 Ma. They are close in age with enderbites of the Slavgorod complex (3014 ?? 7 Ma) and granodiorites of the Dnieper complex (2972 ?? 6 Ma) on the Slavgorod block, indicating their formation within a short time interval, probably as a result of the plume rise about 3000 Ma ago. Plagiogranitoids were formed by the partial melting of a mafic source, and two-feldspar granites by the partial melting of the older gneiss basement.
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