摘要
REE and other trace elements in ores,wall rocks,alkaline volcanic rocks and diabase dikeshave been determined in the Yinachang Fe-Cu-REE deposit.Comparative studies of REE andtrace element geochemical characteristics of these geological bodies indicate that the ores and alkalinevolcanic rocks contain abundant REE and Y (65.9~4633) 10-6.with higher abundances of As,Mo, Nb, Co and U than those of the crust.Their chondrite-normalized pattems show a strong en-richment of LREE and a positive Eu anomaly,in contrast to those to those of the dolomites which arecharacterized by slight LREE enrichment and moderate negative Eu anomaly. The REE pattems ofores are similar to those of hydrothermal sediment cores in the East pacific Rise,whereas the REEpatterns of dolomites are similar to those of PAAS ( Post Archean Average Shale).In combination withthe geological setting of the deposit ,the primary ore-forming fluids might have higher REE and vola-tile elements,and might have been derived from mantle degassing,or the alkaline volcanic magmas.The Yinachang Fe-Cu-REE ore deposit is considered to be of volcanic exhalation-hydrothermalsedimentary origin.