吉林省舒兰市长安堡钼(铜)矿床成矿岩体地球化学特征及其地质意义

摘要

To ascertain the metallogenic characteristics and regularity of the typical porphyry deposits in central Jilin Province,this paper studies the geological characteristics and ore-forming intrusive rocks of the Changanpu Cu-Mo deposit.The geochemical compositions of the metallogenic biotite monzogranite show the characteristics of high silicon,potassium and Al2O3,low total alkali,TiO2,Y and Yb contents,with relative enrichment in LILE and LREE,depletion in HFSE and HREE,negative Eu anomaly and high (La/Yb)N value.Two unaltered samples of biotite monzogranite show relatively low (Rb/La)N values.The characteristics of the rock bodies are similar to those of the island arc calcalkaline igneous rocks in Northeast China.%为查明吉中地区典型斑岩型矿床矿化特征及成矿规律,对长安堡铜钼矿床地质特征和成矿岩体进行了研究.该矿床成矿岩体为黑云母二长花岗岩.岩石主量、微量及稀土元素组成特征为:高硅,全碱含量不高,富钾,Al2O3含量较高,TiO2含量较低,贫Y和Yb,相对富集大离子亲石元素(ULE)和轻稀土元素(LREE),而高场强元素(HFSE)、重稀土元素含量(RREE)相对较低,具负Eu异常,(La/Yb)N值较高,2件未蚀变样品具有较低的(Rb/La)N值,与我国东北部地区岛弧钙碱性火成岩地球化学特征基本一致.