han; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 2" class=MsoNormal>Characteristics of Diagenesis and Mineralization of the Ore-Bearing Granite and Its Tectonic Setting in the Early Mesozoic Era in the Luming-Xing’an-Qianjin Area,Southeast of the Lesser Hinggan Mountains
详细信息
- 责任者：Han Zhenzhe (State Key laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Jin Zheyan
- 刊名：Geology and Prospecting
- 出版年：2010
- 卷期：46(5)
- 关键词：花岗岩 ; granite ; 多金属矿 ; polymetallic ores ; 小兴安岭 ; Xiao Hinggan Mountains
- 页码：p.852-862
- 图表：4 illus., 2 tables, 24 refs.
- 分类号：1001
- issnNo：ISSN0495-5331
- isbnNo：CN11-2043/P
摘要
In the Lu’ming-Xing’an-Qianjin area,southeast of the Xiaoxing’anling,the process of polymetallic diagenesis and mineratlizaion in rthe Early Mesozoic Era can be divided into three stages.The first metallogenic stage is the Mo(Au)metallization epoch related to the porphyritic-like monzonitic granite;the second is the Mo metallizaion epoch related to the monzogranite porphyry;and the third is the Pb,Zn,and Mo metallizaion epoch related to the syenite granite,showing the coincidence to a certain extent between different metallogenic elements and different diagenetic stages.From the early stage to the late stage,the metallogenic elements evolved successively from Mo(Au)→Mo to Pb,Zn,Mo,among which the continuation time of Mo metallogenesis is relatively longer and the metallogenesis changed from the strong into weak and the duration times of diagenesis and mineralization are 191.4～225.0 Ma.In the characteristics of both the field petrography and the major and trace elements of the rocks,the diagenesis and mineralization show the similarity in time and the character of differential evolution of comaga,among which the ore-bearing rock body is characterized by high silicon and the enrichment of alkali and the excess of aluminum,the ore-bearing monzogranite porphyry and syenite granite are relatively categorized as low Sr low Yb granite and low Sr high Yb granite.However,the ore-free porphyritic-like monzonitic granite and syenite granite are mostly categorized as low Sr higher Yb granites.In the region,the Early Mesozoic Era,the diagenesis and mineralization were related to the underplating of the transitional period of tectonic setting after the continental collision of the closure of the Paleo-Asian Ocean,but the above mentioned characterized differentiation in diagenesis and mineralization as well as the enrichment Mo or Pb-Zn of the rock body are most likely related to the source area and the genesis of magma(degree of mixing of the crust-mantle and the mixing proportion) and the magmatic fractional crystallization and the magmatic emplacement depth as well as the structural metallogenic background.