广西金牙金矿毒砂Re-Os同位素测年和硫同位素示踪
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摘要
金牙金矿的载金矿物主要为毒砂,次为含砷黄铁矿。毒砂矿物结构均一,为主成矿阶段热液成因,相较于成因复杂的环带状含砷黄铁矿更适合于同位素测年和示踪。通过对该矿床毒砂的单矿物Re-Os同位素测年和S同位素分析,获得Re-Os等时线年龄为(206±22)Ma,反映金矿形成于晚三叠世末期,大致相当于印支期挤压造山向燕山期拉伸的构造转换期。毒砂δ34S值为-9‰~-3.9‰,平均值为-5.3‰,具有沉积硫的特征,推断硫来自地层,成矿流体为盆地建造水。由此认为金牙金矿是一个与盆地流体和沉积物有关的后生热液矿床。
Jinya gold deposit,located in Fengshan county,is an important Carlin-type gold deposits in Guangxi. Arsenopyrite is one of major gold-bearing minerals in the deposit. The simple texture and hydrothermal genetic type that arsenopyrite would be more suitable for isotopic dating and tracing compared with the zoned pyrite. Re-Os isotopic dating and the S isotopic composition of arsenopyrite were undertaken,in order to better constrain the mineralization age and trace metallogenic material and ore-forming fluid. Re-Os isotopic analysis of arsenopyrite yielded isochronal ages of 206 ± 22 Ma,indicating the metallogenic epoch of Jinya gold deposit is terminal later Triassic,consistent with the tectonic setting of the structural transition from collisional compression to extension tectonics. The δ34S value of arsenopyrites ranges from- 9‰ to- 3. 9‰,with the average value of- 5. 3‰. The sulfur isotopic composition with the sedimentary feature indicates that the sulfur originates from the strata,and ore-forming fluid comes from basin formation water. It can be inferred that Jinya gold deposit is an epigenetic hydrothermal deposit related with basin liquid and sedimentary.
Jinya gold deposit,located in Fengshan county,is an important Carlin-type gold deposits in Guangxi. Arsenopyrite is one of major gold-bearing minerals in the deposit. The simple texture and hydrothermal genetic type that arsenopyrite would be more suitable for isotopic dating and tracing compared with the zoned pyrite. Re-Os isotopic dating and the S isotopic composition of arsenopyrite were undertaken,in order to better constrain the mineralization age and trace metallogenic material and ore-forming fluid. Re-Os isotopic analysis of arsenopyrite yielded isochronal ages of 206 ± 22 Ma,indicating the metallogenic epoch of Jinya gold deposit is terminal later Triassic,consistent with the tectonic setting of the structural transition from collisional compression to extension tectonics. The δ34S value of arsenopyrites ranges from- 9‰ to- 3. 9‰,with the average value of- 5. 3‰. The sulfur isotopic composition with the sedimentary feature indicates that the sulfur originates from the strata,and ore-forming fluid comes from basin formation water. It can be inferred that Jinya gold deposit is an epigenetic hydrothermal deposit related with basin liquid and sedimentary.
引文
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[30]陈懋弘,黄庆文,胡瑛,等.贵州烂泥沟金矿层状硅酸盐矿物及其39Ar-40Ar年代学研究[J].矿物学报,2009,29(3):353-362.
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[33]Cohen K M,Finney S C,Gibbard P L.The ICS International Chronostratigraphic Chart[J].Episodes,2013,36(3):199-204.(http://www.episodes.co.in/contents/2013/september/p199-204.pdf)
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[40]Ohmoto H.Systematics of sulfur and carbon isotopes in hydrothermal ore deposit[J].Economic Geology,1972,67(5):551-578.
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[44]刘建明,刘家军,郑明华,等.微细浸染型金矿床的稳定同位素特征与成因探讨[J].地球化学,1998,27(6):585-591.
[45]刘建中,陈景河,邓一明,等.贵州水银洞超大型金矿勘查实践及灰家堡矿集区勘查新进展[J].地质调查与研究,2009,32(2):168-173.
[46]刘建中,邓一明,刘川勤,等.贵州省贞丰县水银洞层控特大型金矿成矿条件与成矿模式[J].中国地质,2006,33(1):169-177.
[47]刘苏桥,陈懋弘,黄庆文,等.广西乐业林旺金矿床地质特征及控矿因素分析[J].桂林理工大学学报,2010,30(2):188-194.
[2]陈懋弘,毛景文,陈振宇,等.滇黔桂“金三角”卡林型金矿含砷黄铁矿和毒砂的矿物学研究[J].矿床地质,2009,28(5):539-557.
[3]Zhang X C.The geology and hydrothermal evolution of sediment-hosted gold deposits in southwestern Guizhou Province,PRC[D].London:Royal School of Mines,1997.
[4]曾允孚,刘文均,陈洪德,等.华南右江复合盆地的沉积构造演化[J].地质学报,1995,69(2):113-124.
[5]广西壮族自治区地质矿产局.广西壮族自治区区域地质志[M].北京:地质出版社,1985.
[6]李甫安.桂西北主要金矿床地质特征[J].广西地质,1990,3(3):49-64.
[7]李凡庆,卢江,毛振伟,等.用电子探针对广西金牙微细粒金矿金赋存状态的研究[J].光谱学与光谱分析,1995,15(6):107-110.
[8]李福春,叶荣.金牙金矿载金矿物及金的赋存状态研究[J].矿产与地质,1996,10(5):300-305.
[9]国家辉,黄德保,施立达,等.桂西北超微粒型金矿及其成矿和找矿模式[M].北京:地震出版社,1992.
[10]李泽琴,陈尚迪,王奖臻,等.桂西金牙微细浸染型金矿床同位素地球化学研究[J].矿物岩石,1995,15(2):66-72.
[11]王国田.桂西北微细粒浸染型JY金矿床形成机理初探[J].广西地质,1989,2(2):15-24.
[12]广西第二地质队.广西壮族自治区凤山县金牙金矿勘探报告[R].南宁:广西第四地质队,1995.
[13]杜安道,何红蓼,殷宁万,等.辉钼矿的铼-锇同位素地质年龄测定方法研究[J].地质学报,1994,68(4):339-347.
[14]杜安道,赵敦敏,王淑贤,等.Carius管溶样和负离子热表面电离质谱准确测定辉钼矿铼-锇同位素地质年龄[J].岩矿测试,2001,20(4):247-252.
[15]屈文俊,杜安道.高温密闭溶样电感耦合等离子体质谱准确测定辉钼矿铼-锇地质年龄[J].岩矿测试,2003,22(4):254-257.
[16]李超,屈文俊,杜安道.铼-锇同位素定年法中丙酮萃取铼的系统研究[J].岩矿测试,2009,28(3):233-238.
[17]Ludwig K R.Users Manual for Isoplot/Exrev.2.49:A geochronological tool kit for Microsoft Excel[R].Berkeley Geochronology Center Special Publication No.La.1-55.2001.
[18]Hu R Z,Su W C,Bi X W,et al.Geology and geochemistry of Carlin-type gold deposits in China[J].Mineralium Deposita,2002,37(3):378-392.
[19]胡瑞忠,彭建堂,马东升,等.扬子地块西南缘大面积低温成矿时代[J].矿床地质,2007,26(6):583-596.
[20]苏文超,杨科佑,胡瑞忠,等.中国西南部卡林型金矿床流体包裹体年代学研究——以贵州烂泥沟大型卡林型金矿床为例[J].矿物学报,1998,18(3):359-362.
[21]王国田.桂西北地区三条铷-锶等时线年龄[J].广西地质,1992,5(1):29-35.
[22]胡瑞忠,苏文超,毕献武,等.滇黔桂三角区微细浸染型金矿床成矿热液一种可能的演化途径:年代学证据[J].矿物学报,1995,15(2):144-149.
[23]刘平,李沛刚,马荣,等.一个与火山碎屑岩和热液喷发有关的金矿床——贵州泥堡金矿[J].矿床地质,2006,25(1):101-110.
[24]李文亢,姜信顺,具然弘,等.黔西南微细金矿床地质特征及成矿作用[C]//沈阳地质矿产研究所.中国金矿主要类型区域成矿条件文集-6.黔西南地区.北京:地质出版社,1989:1-86.
[25]Cunningham C G,Ashley R P,Chou I-Ming,et al.Newly discovered sedimentary rock-hosted disseminated gold deposits in the People's Republic of China[J].Economic Geology,1988,83(7):1462-1467.
[26]张峰,杨科佑.黔西南微细浸染型金矿裂变径迹成矿时代研究[J].科学通报,1992,27(17):1593-1595.
[27]朱赖民,刘显凡,金景福,等.滇-黔-桂微细浸染型金矿床时空分布与成矿流体来源研究[J].地质科学,1998,33(4):463-474.
[28]刘建中,邓一明,刘川勤,等.水银洞金矿床包裹体和同位素地球化学研究[J].贵州地质,2006,23(1):51-56.
[29]陈懋弘,毛景文,屈文俊,等.贵州贞丰烂泥沟卡林型金矿床含砷黄铁矿Re-Os同位素测年及地质意义[J].地质论评,2007,53(3):371-382.
[30]陈懋弘,黄庆文,胡瑛,等.贵州烂泥沟金矿层状硅酸盐矿物及其39Ar-40Ar年代学研究[J].矿物学报,2009,29(3):353-362.
[31]Su W C,Hu R Z,Xia B,et al.Calcite Sm-Nd isochron age of the Shuiyindong Carlin-type gold deposit,Guizhou,China[J].Chemical Geology,2009,258:269-274.
[32]陈懋弘,张延,蒙有言,等.桂西巴马料屯金矿床成矿年代上限的确定——对滇黔桂“金三角”卡林型金矿年代学研究的启示[J].矿床地质,2014,33(1):1-13.
[33]Cohen K M,Finney S C,Gibbard P L.The ICS International Chronostratigraphic Chart[J].Episodes,2013,36(3):199-204.(http://www.episodes.co.in/contents/2013/september/p199-204.pdf)
[34]Chen M H,Mao J W,Bierlein F P,et al.Structural features and metallogenesis of the Carlin-type Jinfeng(Lannigou)gold deposit,Guizhou Province,China[J].Ore Geology Reviews,2011,43(1):217-234.
[35]陈懋弘,黄庆文,李继贤,等.广西乐业林旺金矿床构造解析及构造成矿作用[J].大地构造与成矿学,2010,34(3):349-361.
[36]陈懋弘,毛景文,Phillip J U,等.贵州锦丰(烂泥沟)超大型金矿床构造解析及构造成矿作用[J].矿床地质,2007,26(4):380-395.
[37]陈衍景,张静,张复新,等.西秦岭地区卡林-类卡林型金矿床及其成矿时间、构造背景和模式[J].地质论评,2004,50(2):134-152.
[38]Hofstra A H,Cline J S.Characteristics and models for Carlintype gold deposits[J].SEG Reviews,2000,13:163-220.
[39]Cline J S,Hofstra A H,Muntean J L,et al.Carlin-type gold deposit in Nevada:Critical geologic characteristics and viable model[J].Economic Geology 100th Anniversary Volume,2005:451-484.
[40]Ohmoto H.Systematics of sulfur and carbon isotopes in hydrothermal ore deposit[J].Economic Geology,1972,67(5):551-578.
[41]郑永飞,陈江峰.稳定同位素地球化学[M].北京:科学出版社,2000.
[42]Holse W T,Magaritz M,Ripperdan R L.Global isotopic events[C]//Walliser O H.Global Events and Event Stratigraphy in the Phanerzoic.Berlin:Springer-Verlag,1996:63-88.
[43]王国芝,胡瑞忠,苏文超,等.滇-黔-桂地区右江盆地流体流动与成矿作用[J].中国科学:D辑,2002,32(S):78-86.
[44]刘建明,刘家军,郑明华,等.微细浸染型金矿床的稳定同位素特征与成因探讨[J].地球化学,1998,27(6):585-591.
[45]刘建中,陈景河,邓一明,等.贵州水银洞超大型金矿勘查实践及灰家堡矿集区勘查新进展[J].地质调查与研究,2009,32(2):168-173.
[46]刘建中,邓一明,刘川勤,等.贵州省贞丰县水银洞层控特大型金矿成矿条件与成矿模式[J].中国地质,2006,33(1):169-177.
[47]刘苏桥,陈懋弘,黄庆文,等.广西乐业林旺金矿床地质特征及控矿因素分析[J].桂林理工大学学报,2010,30(2):188-194.