文章摘要
韩振哲.小兴安岭东南鹿鸣-兴安-前进地区早中生代 含矿花岗岩成岩成矿特征[J].地质与勘探,2010,46(5):852-862
小兴安岭东南鹿鸣-兴安-前进地区早中生代 含矿花岗岩成岩成矿特征
Characteristics of Diagenesis and Mineralization of the Ore-Bearing Granite and Its Tectonic Setting inthe Early Mesozoic Era in the Luming-Xing爷an-Qianjin Area, Southeast of the Lesser Hinggan Mountains
投稿时间：2010-05-21  修订日期：2010-08-12
DOI：
中文关键词: 二长-正长花岗岩 成岩成矿 早中生代 找矿前景 小兴安岭东南
英文关键词: monzonitic-syenite granite,diagenesis and mineralization,Early Mesozoic Era,transitional period of tectonic setting,southeast of Xiaoxing'anling
基金项目:黑龙江省兴安矿业公司(0100000610092)、黑龙江省1：5 万矿调(2300000650007)项目联合资助。
作者单位
韩振哲 中国地质大学地质过程与矿产资源国家重点实验室,北京 
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中文摘要:
      [摘要]小兴安岭东南鹿鸣-兴安-前进地区,与早中生代二长-正长花岗岩有关多金属成岩成矿 过程可划分为三期:第一期为似斑状二长花岗岩有关的Mo(Au)成矿期,第二期为二长花岗斑岩有关的 Mo 成矿期,第三期为正长花岗岩有关的Pb、Zn、Mo 成矿期,总体显示不同成矿元素与不同时期岩体存 在一定程度的耦合性。从早期至晚期成矿元素由Mo(Au)寅Mo寅Pb、Zn、Mo 依次演化,其中Mo 成矿作 用延续时间较长,成矿作用也由强变弱,成岩成矿时代为225郾0 ~ 191郾4Ma。在野外岩相学、岩石主微量 元素特征上,成岩成矿显示出时间上的相近性和同源岩浆分异演化的特征,其中含矿岩体以高硅富碱和 过铝为特征,含矿二长花岗斑岩、正长花岗岩分别属低Sr 低Yb 类、低Sr 高Yb 类花岗岩,而不含矿似斑 状二长花岗岩、正长花岗岩多为低Sr 较高Yb 类花岗岩。上述成岩成矿特征上的差异,以及岩体是富集 Mo 还是Pb、Zn,可能与源区物源、岩浆成因(壳幔混源程度、混合比例等) 和岩浆结晶分异、岩浆侵位深 度,以及与成矿构造背景等有关。
英文摘要:
      Abstract:In the Lu爷ming-Xing爷an-Qianjin area, southeast of the Xiaoxing爷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 monzo鄄 nitic 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)寅Mo to Pb, Zn, Mo, among which the continuation time of Mo met鄄 allogenesis is relatively longer and the metallogenesis changed from the strong into weak and the duration times of diagenesis and mineralization are 191郾4 ~225郾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 en鄄 richment of alkali and the excess of aluminum, the ore-bearing monzogranite porphyry and syenite granite are relatively categorized as low Sr low Yb gran鄄 ite 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 set鄄 ting after the continental collision of the closure of the Paleo-Asian Ocean, but the above mentioned characterized differentiation in diagenesis and miner鄄 alization as well as the enrichment Mo or PbZn 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 metallo鄄 genic background.
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