安徽铜陵大团山石英闪长岩岩石化学特征及成因探讨  

PETROCHEMICAL CHARACTERISTICS AND DISCUSSION ON THE GENESIS OF THE DATUANSHAN QUARTZ DIORITE IN TONGLING AREA,ANHUI PROVINCE

作　　者：王云健[1] 刘经华[2] 徐兆文[1] 方长泉[1] 蒋少涌[1] 杨小男[1] 张军[1] 李海勇[1] 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室南京大学地球科学系,南京210093 [2]安徽铜都铜业股份有限公司冬瓜山铜矿,安徽铜陵244031

出　　处：《地质找矿论丛》2007年第4期264-269,286,共7页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金项目(编号:49873016);高等学校博士点研究基金项目(编号:20020284035)资助

摘　　要：大团山石英闪长岩体位于安徽铜陵狮子山矿田内，属于燕山期侵入岩。岩石的主量元素分析结果表明：w（SiO2）=57．5％～64．1％，w（Na2O＋K2O）=6．94％～7．71％，K20／Na2O=0.57～0．97，属于高钾碱钙性岩系；微量元素分析结果显示具有高Ba，Sr，低Y，亏损Nb，Ta和Ti的特点；稀土元素球粒陨石标准化曲线显示轻稀土富集而重稀土亏损，Eu负异常不明显。研究成果表明，大团山石英闪长岩的形成环境类似于火山弧型花岗岩，可能与富Ba，Sr的基性岩浆的底侵作用有关，成岩物质主要来自于富集地幔，在上升过程中受到了地壳物质混染。Datuanshan quartz diorite,which is located in Shizishan orefield, Tongling area, Anhui Province, belongs to high K calc-alkali series intruded in late Yanshanian period. The analyzing results of major elements show that the content of SiO2 is from 57.5% to 64.1% , Na2O ＋ K2O from 6.94% to 7.71%, and K2O/Na2O from 0.57 to 0.97. The analyzing results of trace elements show that the content has the character of high Ba, Sr, low Y and a depletion Nb, Ta, Ti; The chondrite normalized patterns of rare earth elements reveals a depletion of light rare earth and enrichment of heavy one. 3Eu shows little negative abnormity. All these studies indicate that the origin environment of Datuanshan intrusion is similar to volcanic arc granite and related to the underplating of the mafic igneous rocks which are rich in Ba and Sr. The source materials is from enriched mantle and was contaminated by the crustal material during the ascending process.

关 键 词：岩石化学 成因探讨 石英闪长岩 大团山铜矿床 安徽铜陵 

分 类 号：P581[天文地球—岩石学] P584[天文地球—地质学]