| Abstract: | New geological, petrochemical, mineralogical, and geochemical data are presented on the Uspensky granitoid massif in Southern
Primorye. The massif consists of the rocks of two associations: (1) the early association (103.3 ± 2.4 Ma) consisting of garnet-bearing
biotite and two-mica granite-leucogranites and (2) the late association (99 ± 2 Ma) represented by biotite (±amphibole) granodiorites,
melanogranites, and granites. The granitoids of both associations have moderate potassic alkalinity and elevated alumina contents
but differ in the proportions of alumina, calcium, and alkalis. The garnet-bearing granite-leucogranites are characterized
by the highest Rb, Th, and U contents and the lowest Sr, Ba, Hf, and Zr contents. The REE distribution patterns have a quasi-symmetric
shape and deep Eu minimums. The melanogranites show higher Sr and Ba contents and, as granites, are characterized by asymmetric
REE spectrums with an insignificant negative Eu anomaly. The porphyraceous granodiorites and granites are peculiar in their
lowered Sr and Ba contents, while the granodiorites have lowered contents of K, REE, Zr, Hf, Th, and U; elevated Nb contents;
and a distinctive Eu minimum. |
