Trace Elements Characteristics of Rocks in Nuri, Tibet

We used the ME-MS61r method to analysis the trace elements of rocks that widely distributed within Nuri Mine. The spider diagram (fig.1) of trace elements within skarn and limestone in Nuri Mine show that: there’s some similarity between the skarn and limestone, they are all right-wing type, depletion of Ti, Zr, Hf and enrichment of the high field strength element like Th, U, Y, etc. they have high Sr/Y 0.3-435, most value is 31-43.The igneous rocks in Nuri Mine are relatively enriched Th, U, La, Sr, Rb and deplete Hf, Nb, Ta; their spider diagrams have much similarity between quartz vein and quartz diorite porphyry (fig.2), indicate that a close genetic relationship is present between them and the quartz diorite porphyry have a direct effect on mineralization process. Magmatite of the mine generally loss Zr and have a character of Nb negative abnormality, indicate that magma may mix with crust-derived material during the process of rising (fig.3). Magmatite of Nuri Mine has obvious high value of Sr/Y, the value is 3.1~99, almost are about 30. The fig.4 show that part of intrusive rock of Nuri Mine locate in adakite rocks, including quartz diorite porphyry, granodiorite, quartz diorite, and trace element relatively enrich Th. They have similar characteristics of adakite with Chengba and Jiama deposit in Shannan, but lower content of Th, indicate that the magmatite of Nuri mine derive from juvenile lower crust ZHANG Kailiang, ZHU Feilin, SONG Xuebing, ZHANG Junji and SHI Zeming, 2014. Trace Elements Characteristics of Rocks in Nuri, Tibet. Acta Geologica Sinica (English Edition), 88(supp. 2): 1037-1038.