• 责任者：Tang Qingyan (Key Laboratory of Western Mineral Resources of Gansu Province ; School of Earth Sciences ; Lanzhou University ; Lanzhou 730000 ; China) ; Zhang Mingjie
• 刊名：Acta Petrologica et Mineralogica
• 出版年：2013
• 卷期：32(5)
• 关键词：岩浆矿床 ; magmatic deposit ; 云南 ; Yunnan Province ; 四川 ; Sichuan Province
• 页码：p.680-692
• 图表：5 illus., 102 refs.
• 分类号：1000
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

     Different types of magmatic deposits, such as Cu-Ni-PGE sulfide deposits and V-Ti-Fe oxide deposits, have been formed in the late-Permian Emeishan mantle plume magmatic system. They show the trends of in- crease of basic rock proportion and the decrease of PGE content from PGE-rich, Cu-Ni-PGE, through Cu-Ni- rich sulfide deposits, to V-Ti-Fe oxide deposits. Cu-Ni-PGE sulfide deposits are characterized by negative anomalies of Nb and Ta, relatively high contents of H2 and magmatic volatiles, whereas V-Ti-Fe oxide deposits are characterized by positive anomalies of Nb, Ta and Ti, and negative anomalies of Zr and Hf, as well as higher contents of H20, CO2 and H2, and lower contents of magmafic volafiles. They both are enriched in strongly in- compatible elements and light REE. Sr-Nd isotopic compositions of whole rocks from these deposits are similar to those of Emeishan basalts. Sr, Nd, Os, C and He isotopic compositions indicate different degrees of crustal contamination. High Ti basalts and V-Ti-Fe oxide deposits show low degrees of crustal contamination, whereas some low Ti basalts and Cu-Ni-PGE sulfide deposits display high degrees of crustal contamination during mag- matic evolution. These data suggest that the formation of these magmatic deposits might have been related to the Emeishan basaltic system. The formation of oxide deposits was probably related to fractional crystallization, high contents of H20 and elevated oxygen fugacity, whereas sulfide mineralization might have been formed in reduced magmatie media by fractionation and crustal contamination during the magmatic evolution.