Geochemical Characters of Mineralization rock of the Sadaigoumen Molybdenum Deposit and their Constraints on the Deposit Genesis in Fengning, Hebei Province

详细信息   

• 责任者：Luo Wenjuan (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Zhang Dehui
• 刊名：Geology and Prospecting
• 出版年：2010
• 卷期：46(3)
• 关键词：斑岩钼矿床 ; porphyry molybdenum deposit ; 河北 ; Hebei Province
• 页码：p.491-505
• 图表：15 illus., 4 tables, 35 refs.
• 分类号：1001
• issnNo：ISSN0495-5331
• isbnNo：CN11-2043/P

摘要

The geochemical studies on the main elements of monzogranite, the host rock of molybdenum deposit in Sadaigoumen, reveal that the granite is metaluminous high-K calc-alkaline I-type. The host-rock, monzogranite, has a significant fractionation between LREE and HREE and has LREE enriched patterns with relatively weak Eu negative anomalies (δEu=0.78). La/Sm-La diagram shows that monzogranite is related to fractional crystallization. Trace elements such as Nb, Ta, P, Zr, and Ti are clearly depleted while large ion lithophile elements such as Rb, Th, K, and Ba are enriched. Measured with Biotite aluminum manometer, the average crystallization pressure is 1.83 kbar, namely the emplacement depth is 6.78 km on average. The constraints on the formation of porphyry-type Mo deposits, and the reason why porphyry-type molybdenum was generated, rather than porphyry copper deposit, are discussed. It is finally concluded that this deposit is of the deep source and medium generation porphyry-type molybdenum deposit.