第５期 周 栋等 豫西瑶沟金矿床辉钼矿 Ｒｅ Ｏｓ年龄及其地质意义 １６３ 图 １ 瑶沟矿区地质图 改自文献 １８ Ｆｉｇ １ ＧｅｏｌｏｇｉｃａｌｍａｐｏｆＹａｏｇｏｕｇｏｌｄｄｅｐｏｓｉｔ 向及东西向 瑶沟矿区出露的喷出岩主要为中元古界熊耳群 陆相火山岩区域 内 大 规 模 侵 入 岩 不 太

37 5 2018 9 GeologicalScienceandTechnologyInformation Vol.37 No.5 Sep. 2018 doi:10.19509/j.cnki.dzkq.2018.0522,,,. Re-Os [J].,2018,37(5):162-167. Re-Os 1, 2, 3 1, (1., 710054;2., 510640;3., 710016) :, Re-Os 4, 255.69~249.05 Ma, (253.0±4.5)Ma, (255.3±2.8)Ma, w(re) 2.988 10-6 ~47.086 10-6,, : ;Re-Os ; ; :P618.51;P597 :A :1000-7849(2018)05-0162-06 - - [8,11-13] >200t [1],, 133~125 Ma [2] (242±11)Ma [3] [14-17],,, [1,4], 3 :1, Re-Os [5-7] ;2,, [8], [8] ;3 Te Se, [9] [10] 3 :1,, 111 54 36 ~111 55 38, 34 05 51 ~34 06 99 3920.4kg, 4.88 [1] ;2 10-6, [18], 22 [4] ;3,, : A - ( 1) 1 :2018-01-09 : : (41402047); (20170102;20180310) : (1989 ),, E-mail:781821834@qq.com : (1963 ),,, E-mail:tpzhao@gig.ac.cn

第５期 周 栋等 豫西瑶沟金矿床辉钼矿 Ｒｅ Ｏｓ年龄及其地质意义 １６３ 图 １ 瑶沟矿区地质图 改自文献 １８ Ｆｉｇ １ ＧｅｏｌｏｇｉｃａｌｍａｐｏｆＹａｏｇｏｕｇｏｌｄｄｅｐｏｓｉｔ 向及东西向 瑶沟矿区出露的喷出岩主要为中元古界熊耳群 陆相火山岩区域 内 大 规 模 侵 入 岩 不 太 发 育 仅 在 矿区以北有五丈山 岩 体 出 露 该 岩 体 为 燕 山 中 期 侵 入的正长花岗岩矿区内出露较多的是沿早期裂隙 充填的脉岩 如辉 绿 岩 闪 长 玢 岩 云 煌 岩 及 正 长 斑 岩脉等 图 １ 瑶沟金矿床内有 １７ 条 金 矿 脉 图 １ ２种金矿 类型 即 构 造 蚀 变 岩 型 和 石 英 脉 型 其 中 １号矿 号 矿 脉 为 主 矿 脉 规 模 较 大 号 矿 脉为构 脉 １４ １４ 造蚀变岩型金矿 矿 脉 受 近 东 西 压 扭 性 构 造 蚀 变 带 图 ２ 瑶沟金矿床的矿石手标本照片 控制 矿体的 分 布 产 状 形 态 与 构 造 带 一 致１ 号 Ｆｉｇ ２ ＨａｎｄｓｐｅｃｉｍｅｎｐｉｃｔｕｒｅｓｏｆＹａｏｇｏｕｇｏｌｄｄｅｐｏｓｉｔ 矿脉为石英脉型金 矿 含 金 石 英 脉 受 北 东 向 张 扭 性 断裂控制 矿脉沿断裂构造充填 Ｍｏ 辉钼矿 Ｐｙ 黄铁矿 Ｑｔ ｚ 石英 ２ 样品采集及位置 瑶沟金矿床金矿石主要伴生金属矿物有赤铁 矿 镜铁矿 黄铁矿 褐铁矿 其次为黄铜矿 方铅矿 辉钼矿等 手 标 本 下 可 见 黄 铁 矿 与 辉 钼 矿 伴 生 图 ２ 有用矿物 为 自 然 金 脉 石 矿 物 有 石 英 图 ２ Ａ 高岭土 绢云母 方解石等 为了进行对比研究和精确确定瑶沟金矿床的成 矿年龄 笔 者 对 该 矿 床 进 行 了 Ｒｅ Ｏｓ 同 位 素 测 年 用于 Ｒｅ Ｏｓ测年的４ 件辉钼矿样品均采自１ 号矿脉 的矿石中 辉 钼 矿 主 要 以 薄 膜 状 形 式 产 出 图 ２

164 2018,, >99%, 3 4 4 Re-Os 1, Re Os w( 187 Re) w( 187 Os),w( 187 Re) 1.878 10-6 ~29.596 10-6,w( 187 Os) 7.882 10-9 ~, Ther- 126.339 10-9 w( 187 Re) w( 187 Os) ( moscientificx-series2icp-ms 3), 187 Os 187 Re [19-21], β, Re-Os GBW04435 GBW04436 Table1 1 Re-Os MolybdeniteRe-OsisotopicdatafortheYaogougolddeposit /g w(re)/10-6 2σ w( 187 Re)/10-6 2σ w( 187 Os)/10-9 2σ /Ma 2σ YG-4 0.0726 2.988 0.011 1.878 0.007 7.882 0.059 251.40 2.09 YG-7 0.2012 3.479 0.017 2.187 0.011 9.091 0.056 249.05 1.97 YG-8 0.0257 34.487 0.127 21.676 0.08 92.126 0.338 254.57 1.32 YG-20 0.0180 47.086 0.376 29.596 0.236 126.339 0.509 255.69 2.28 Ar-Ar 143~128 Ma [22], ( ) Ar-Ar (125.1± 1.2)Ma [23], Ar-Ar (128.5±0.2)~ (126.7±0.2)Ma [24], Re-Os 255.6 ~215.4 Ma [25-26], Re-Os (232±11)Ma [27] ; Ar-Ar (156.1±1.0)Ma [28], - Ar-Ar (125.11±1.59)~ (115.11±1.5)Ma [29],7 3 w( 187 Os)-w( 187 Re) Re-Os (135.6±5.6)Ma [13], Fig.3 Diagramsof 187 Osvs. 187 Reof molybdenitesfrom the Ar-Ar (121.6±1.2)Ma, YaogouAudeposit Sm-Nd (206±34)~ (202±18) Ma [28], Ar-Ar (236.5± Isoplot 4 Re- 187 Os 2.5)~(227.7±1.4)Ma [28], Re- 187 Os, 2, (255.3±2.8)Ma( 4-A) 4 (250~208 Ma) (130~115 Re-Os 249.05~255.69 Ma (253.0±4.5)Ma(MSWD= 1.6)( 4-B) Ma), ( ), [30], 5 [25] Re-Os 5.1 (255.3±2.8)Ma (253.0±4.5)Ma, -,

5 : Re-Os 165 4 Re-Os Fig.4 Re-OsisochronandweightedmodelageofmolybdenitesfromtheYaogougolddeposit : 238~218 Ma 200km, [31-34], 34~38km, 242~ [49] 227 Ma [35-37], 220 Ma, [8], : (250 Ma),, ; A,, A,,,,, 5.2 6, Re-Os (1) 4 [38-39],, Re-Os,, w(re) (255.69~249.05)Ma (253.0±, n 10-6 n 10-5 n 10-4[40-41], 4.5)Ma, (255.3±2.8)Ma,,Re-Os, (2) w(re) 2.988 10-6 ~47.086 10-6,,, [42-44] [1], [45-46] (3) 4 w(re) 2.988 10-6 ~ 47.086 10-6, 5.3 :, [1] MaoJW,GoldfarbRJ,ZhangZ W,etal.Golddepositsinthe Xiaoqinling-Xiong ershanregion,qinling Mountains,central [18,45,47-48], China[J].Mineralium Deposita,2002,37(3/4):306-325.

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5 : Re-Os 167 Qilian Mountainsanditsgeologicalsignificance[J].Geochimica etcosmochimicaacta,1999,63(11/12):1815-1818. Oschronometerin molybdenite:howand whyitworks[j]. TerraNova,2001,13(6):479-486. [42],,,. [47],,,. [J]. [J].,1998,8(1):,1998,12(4):493-500. 73-76. [43],. [R]. :,,2001,7(4):1-8. 1991. [M]. :,2000. [45],,,. [M]. :,1997. [46],,,. [J].,1999,6(2):315-323. [48],,. [J]. [49],,. [44],,,. [M]. :,1988. Re-OsDatingfortheMolybdenitefromtheYaogouGoldDeposit WestofHenanProvinceandItsGeologicalSignificance ZhouDong 1,ZhaoTaiping 2,ZhaoPengbin 3,ZhangXiaotuan 1 (1.ShaanxiInstituteofGeologicalSurvey,Xi an710054,china; 2.GuangzhouInstituteofGeochemistry,ChineseAcademyofSciences,Guangzhou510640,China; 3.ShaanxiGeologicalSurveyCenter,Xi an710016,china) [41]Stein HJ,MarkeyRJ,MorganJW,etal.TheremarkableRe- Abstract:Beingcomposedoftypicalquartzveinorebodiesandstructuralalteredrock-hostorebodies,Yao- gougolddepositislocatedatxiong ershanregion HenanProvince.Four molybdenitesamplesfromthe YaogougolddepositwerecolectedtoperformtheRe-Osdating.TheRe-Osdatingyieldmodelagesran- gingfrom255.69mato249.05mawithaweightedmeanageof(253.0±4.5)ma,andobtainanisochron ageof(255.3±2.8)ma.evidently,modelagesareconsistentwithisochronagewithintheerrorranges, sowecanconstraintheore-formingageofyaogougolddepositattheearly Triassic.Themolybdenites fromtheyaogoudeposithavealowcontentofre,2.988 10-6 ~47.086 10-6,probablyshowingthe ore-formingmaterialsweremainlyfromcrustbutmixedwithmantle.thedeepsourcefluidscarryinggold andothermetalogenicmaterialsmovedupalongthemachaoyingfaultandextractedthematerialsfromthe surroundingrocksunderextrusionseting.finaly,theprecipitationofmaterialsinne,nearewfaultsor structuralfracturezoneformedtheyaogougolddeposit. Keywords:molybdenite;Re-Osisotopicages;Yaogougolddeposit;westofHenanProvince;Xiong ershan region