安徽贵池地区岩浆岩演化特征及其与金银多金属矿的关系
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摘要
安徽贵池地区铜、铁、金、银、钼、硫等矿产资源丰富,近年来成为新的找矿热点区域之一。通过梳理近年来贵池地区岩浆岩与金银多金属矿床的成矿关系研究成果,并总结该区主要成矿岩体的地球化学特征及成矿规律,发现该区大多数铜金多金属矿床的成矿岩体以花岗闪长(斑/玢)岩为主,成岩年龄集中在135～145/150 Ma,高Sr、低Y,轻稀土元素富集,大多数岩体具有埃达克(质)岩的地球化学特征。该区总体为由早期的埃达克(质)岩浅成侵入演变为晚期的A型花岗岩侵入,埃达克(质)岩对该区金银多金属成矿具有一定的指示作用,上述认识对拓展该区找矿思路具有一定的参考意义。
The Guichi region has become one of the prospecting targets in recent years for its hosting abundant mineral resources such as gold, silver, copper, molybdenum, sulfur and etc. Based on the regional geological settings of the Guichi area and metallogenic relation between magmatic rocks and Au-Ag polymetallic mineralizationa, this study summarized geochemical properties of ore-forming rocks as well as mineralization regularity. It was discovered that the ore-forming intrusions in most Cu-Au polymetallic deposits are dominated by granodiorite, which belongs to high potassium calc-alkaline and calc-alkaline series, and have the diagenesis age mainly ranging from 148 to 136 Ma. The granodiorites are strongly enriched in Sr and LREE, but relatively depleted in Y, presenting the geochemical characteristics of adakitic rocks. The high oxygen fugacity resulted in the formation of Cu and Au deposits, indicating that adakitic rocks played a certain role in formation of ore deposits. Therefore, the above understanding has some reference significance for broadening ore prospecting in this area.
The Guichi region has become one of the prospecting targets in recent years for its hosting abundant mineral resources such as gold, silver, copper, molybdenum, sulfur and etc. Based on the regional geological settings of the Guichi area and metallogenic relation between magmatic rocks and Au-Ag polymetallic mineralizationa, this study summarized geochemical properties of ore-forming rocks as well as mineralization regularity. It was discovered that the ore-forming intrusions in most Cu-Au polymetallic deposits are dominated by granodiorite, which belongs to high potassium calc-alkaline and calc-alkaline series, and have the diagenesis age mainly ranging from 148 to 136 Ma. The granodiorites are strongly enriched in Sr and LREE, but relatively depleted in Y, presenting the geochemical characteristics of adakitic rocks. The high oxygen fugacity resulted in the formation of Cu and Au deposits, indicating that adakitic rocks played a certain role in formation of ore deposits. Therefore, the above understanding has some reference significance for broadening ore prospecting in this area.
引文
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[38] 张旗.关于C型埃达克岩成因的再探讨[J].岩石矿物学杂志,2011,30(4):739-747.
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[40] 董胜.安徽省贵池地区区域地球化学特征及找矿意义[J].物探与化探,2006,30(3):215-223.
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[42] SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D,Norry M J.Magmatism in Oceanic Basins[M].London:Geological Society Special Publication,1989,42:313-345.
[2] 姚孝德,谭德兴,陈芳.安徽省池州地区区域成矿模式[J].安徽地质,2013,23(3):200-204.
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[8] WU F Y,JI W Q,SUN D H,et al.Zircon U-Pb geochronology and Hf isotopic compositions of the Mesozoic granites in southern Anhui Province,China[J].Lithos,2012,150(5):6-25.
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[10] 赵超,谢兴楠,马春,等.安徽池州马头铜钼矿床锆石年龄与辉钼矿Re-Os同位素测定的地质意义[J].中国有色金属学报,2015,25(12):3461-3472.
[11] 陈雪锋,周涛发,张达玉,等.皖南池州桂林郑钼矿床成矿岩体的年代学和地球化学特征及其地质意义[J].岩石学报,2017,10:3200-3216.
[12] 安徽省地质矿产局.殷汇幅1∶5万区域地质调查报告[R].2006.
[13] 刘园园,马昌前,吕昭英,等.长江中下游贵池矿集区燕山期岩浆作用及其地质意义:年代学、地球化学及Sr-Nd-Hf同位素证据[J].岩石学报,2012,28(10):3287-3305.
[14] 赵玲,陈志洪.皖南谭山岩体的锆石定年及地质意义[J].资源调查与环境,2014,35(3):185-191.
[15] 田坎,赵永鑫,马渊博.安徽贵池黄山岭铅锌钼矿床成因研究——来自锆石U-Pb年龄及Pb同位素的制约[J].矿物学报,2015(Z):59.
[16] 段留安,杨晓勇,汪方跃,等.长江中下游成矿带贵池抛刀岭金矿含矿岩体年代学及地球化学研究[J].岩石学报,2012,28(10):3241-3254.
[17] 范羽,周涛发,张达玉,等.皖南地区青阳―九华山复式岩体的成因[J].岩石学报,2016,32(2):419-438.
[18] 宋国学,秦克章,李光明.长江中下游池州地区矽卡岩-斑岩型W-Mo矿床流体包裹体与H、O、S同位素研究[J].岩石学报,2010,26 (9):2768-2782.
[19] 彭戈,闫峻,初晓强,等.贵池岩体的锆石定年和地球化学:岩石成因和深部过程[J].岩石学报,2012,28 (10):3271-3286.
[20] 段留安,古黄玲,杨晓勇,等.长江中下游贵池李湾铜多金属矿区岩浆岩年代学及Hf同位素地球化学研究[J].岩石学报,2015,31(7):1943-1961.
[21] 谢建成,陈思,荣伟,等.安徽牯牛降A型花岗岩的年代学、地球化学和构造意义[J].岩石学报,2012,28(12):4007-4020.
[22] YANG Y Z,WANG Y,YE R S,et al.Petrology and geochemistry of Early Cretaceous A-type granitoids and late Mesozoic mafic dikes and their relationship to adakitic intrusions in the lower Yangtze River belt,Southeast China[J].International Geology Review,2016,59 (1):62-79.
[23] ZHOU T F,WANG S W,FAN Y,et al.A review of the intracontinental porphyry deposits in the Middle-Lower Yangtze River Valley metallogenic belt,Eastern China[J].Ore Geology Reviews,2015,65:433-456.
[24] 赖小东,杨晓勇,孙卫东,等.铜陵舒家店岩体年代学、岩石地球化学特征及成矿意义[J].地质学报,2012,86(3):470-485.
[25] LI J W,ZHAO X F,ZHOU M F,et al.Origin of the Tongshankou porphyry-skarn Cu-Mo deposit,eastern Yangtze craton,Eastern China:geochronological,geochemical,and Sr-Nd-Hf isotopic constraints[J].Mineralium Deposita,2007,43:315-336.
[26] 李玉松,蔡晓兵,汪晶,等.安徽庐枞盆地黄寅冲铅锌矿床闪长玢岩锆石U-Pb年龄及其地质意义[J].华东地质,2016,37(1):19-27.
[27] GU H L,YANG X Y,DENG J H,et al.Geochemical and zircon U-Pb geochronological study of the Yangshan A-type granite:Insights into the geological evolution in south Anhui,eastern Jiangnan Orogen[J].Lithos,2017,284-285:156-170.
[28] 洪大军,黄志忠,产思维,等.安徽宣城麻姑山—荞麦山地区铜多金属矿地质特征及找矿方向[J].华东地质,2017,38(1):28-36.
[29] 邢凤鸣,徐祥.皖南中生代花岗岩类Nd、Sr、Pb同位素特点[J].安徽地质,1993(1):35-41.
[30] 古黄玲.长江中下游贵池矿集区燕山期岩浆作用与铜(钼)金成矿关系研究[D].合肥:中国科学技术大学,2017:1-180.
[31] 高冉,闫峻,李全忠,等.皖南谭山岩体成因:年代学和地球化学制约[J].高校地质学报,2017,23(2):227-243.
[32] 聂张星,石磊,古黄玲,等.江南过渡带东至查册桥金矿床40Ar-39Ar年代学及成矿条件研究[J].大地构造与成矿学,2017,41(3):502-515.
[33] 曾健年.岩浆岩体含矿性评价的某些常量元素标志[J].地质科技情报,1990,9(2):75-79.
[34] 中国科学技术大学,安徽省地质矿产勘查局324地质队.贵池地区燕山期岩浆岩与金银多金属成矿关系研究[R].2017.
[35] 马振东,张本仁,蒋敬业,等.长江中下游及邻区基底和花岗岩成矿元素丰度背景的研究[J].地质学报,1998,72(3):267-275.
[36] DEFANT M J,XU J F,KEPEZHINSKAS P.Adakites:Some Variations on a Theme[J].Acta Petrologica Sinica,2002,18:129-142.
[37] THIEBLEMONT D,STEIN G,LESCUYER J L.Gisements Epithermaux et Porphyriques:la Connexion Adakite[J].Earth and Planetary Science,1997,325(2):103-109.
[38] 张旗.关于C型埃达克岩成因的再探讨[J].岩石矿物学杂志,2011,30(4):739-747.
[39] STERN C R,KILIAN R.Role of the subducted slab,mantle wedge and continental crust in the generation of adakites from the Andean Austral Volcanic Zone[J].Contributions to Mineralogy and Petrology,1996,123(3):263-281.
[40] 董胜.安徽省贵池地区区域地球化学特征及找矿意义[J].物探与化探,2006,30(3):215-223.
[41] SUN W D,HUANG R F,LI H,et al.Porphyry deposits and oxidized magmas[J].Ore Geology Reviews,2015,65(1):97-131.
[42] SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.In:Saunders A D,Norry M J.Magmatism in Oceanic Basins[M].London:Geological Society Special Publication,1989,42:313-345.
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