ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
扬子西缘东炉房Cu-Mo矿床侵入岩年代学、地球化学特征及其成矿意义
  
关键词:quartz diorite porphyrite  U-Pb geochronology  geochemistry  Late Cretaceous  Donglufang  the western margin of Yangtze Block
基金项目:云南省科技计划项目高层次科技人才及创新团队选拔专项(编号: 202305AT350004)
作者单位E-mail
段召艳 昆明理工大学国土资源工程学院地球科学系及云南省三江成矿系统与评价创新团队
云南省地质调查院
自然资源部三江成矿作用及资源勘查利用重点实验室 
441232774@qq.com 
张有名 云南省地质调查院  
杨新强 云南省地质调查院  
杜斌 昆明理工大学国土资源工程学院地球科学系及云南省三江成矿系统与评价创新团队
云南省地质调查院
自然资源部三江成矿作用及资源勘查利用重点实验室 
 
伍建兢 云南省地质调查院  
杨富成 昆明理工大学国土资源工程学院地球科学系及云南省三江成矿系统与评价创新团队  
江小均 昆明理工大学国土资源工程学院地球科学系及云南省三江成矿系统与评价创新团队 cagsjiang@126.com 
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摘要:
Geochronology and Whole-rock Geochemistry of Intrusive Rocks from the Donglufang Cu-Mo Deposit in Western Margin of the Yangtze Block and Their Metallogenic Implications
      The Donglufang Cu-Mo deposit is located in the western margin of the Yangtze Block. The deposit is characterized by porphyry Mo (-Cu) orebodies associated with quartz monzonite porphyry and skarn Cu orebodies. While previous research has mainly focused on the genesis of porphyry Mo mineralization, research on skarn Cu mineralization is relatively weak. In this paper, the zircon U-Pb geochronology and whole-rock geochemistry of Cu-mineralized quartz diorite porphyrite are studied on the basis of investigations of the exploration results of the deposit. The results show that the zircon U-Pb weighted average age of quartz diorite porphyrite is 82 Ma, indicating that it was formed in the Late Cretaceous, which is consistent with the W-Mo(Cu) mineralization age of the Late Cretaceous in the Geza arc. Quartz diorite porphyrite are high silica (SiO2=60.74%–63.36%), alkali-rich (Na2O+K2O=7.03%–9.29%), metaluminous (A/CNK=0.63–0.86), displaying shoshonitic I-type granite characteristics. The rare earth elements have obvious right-leaning patterns and typical adakite affinity characteristics, which can be interpreted as the product of partial melting of the intermediate-mafic lower crust mix with mantle-derived magma. The nature of the magmatic source and the type of wall rocks determine the mineralization zoning of the Donglufang Deposit, with porphyry Mo(-Cu) mineralization occurring in the potassic zone of the deep quartz monzogranite porphyry, skarn Cu(-Mo) mineralization occurring in the contact zone, and vein Pb-Zn-Au-Ag mineralization occurring in the peripheral marble. The deposit constitutes a porphyry mineralization system with Mo(-Cu), Cu(-Mo), and Pb-Zn-Au-Ag mineralization. Our comparative study shows that the Late Cretaceous magmatic rocks and related mineralization in Geza arc extend southward to the western margin of Yangze Block, formed in the post-collision extensional setting. The degree of magmatic differentiation gradually decreases from north to south, and the contribution of mantle-derived magma gradually increased, resulting in obvious different mineralization style from north to south, i.e., from northern Xiuwacu W-Mo, Relin Mo-W, Hongshan and Tongchanggou Mo(-Cu), to southernmost Donglufang Cu(-Mo).
DUAN Zhaoyan,ZHANG Youming,YANG Xinqiang,DU Bin,WU Jianjing,YANG Fucheng,JIANG Xiaojun.2024.Geochronology and Whole-rock Geochemistry of Intrusive Rocks from the Donglufang Cu-Mo Deposit in Western Margin of the Yangtze Block and Their Metallogenic Implications[J].Acta Geoscientica Sinica,45(4):515-529.
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