东昆仑哈陇休玛钼(钨)矿床花岗闪长斑岩锆石U-Pb及辉钼矿Re-Os同位素定年及其地质意义
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摘要
哈陇休玛钼(钨)矿床位于东昆仑东段地区,矿床成因为斑岩型,花岗闪长斑岩与成矿关系密切。应用锆石LA-ICP-MS U-Pb法和Re-Os同位素测年法对1件花岗闪长斑岩样品和4件辉钼矿样品进行精确定年。结果表明:成矿花岗闪长斑岩体的形成年龄为(224.68±0.88)Ma(MSWD=0.85);4件辉钼矿样品和1件重复样品的辉钼矿Re-Os等时线年龄为(223.5±1.3)Ma(MSWD=0.66),模式年龄的加权平均值分别为(224.0±1.5)Ma(MSWD=1.8),等时线年龄与模式年龄加权平均值在误差范围内一致。等时线年龄代表了辉钼矿的结晶时间,证实矿区成岩成矿时代晚三叠世,稍晚于东昆仑西段地区钼成矿时代(钼矿主成矿期为中三叠世)。本区辉钼矿w(Re)为4.37×10~(-6)~38.26×10~(-6),平均16.55×10~(-6)与壳幔混源的辉钼矿w(Re)相近(n×10~(-5)),成矿物质来源可能为壳幔混合源,与整个东昆仑造山带晚三叠世强烈壳-幔相互作用大背景相一致。
Halongxiuma molybdenum(tungsten)deposit in the east section of the East Kunlun belt is a porphyry type deposit.Based on the study of metallogenic geological characteristics of deposit,it is recognized that the granodiorite porphyry is closely related to mineralization.The rockforming and ore-forming ages of the granodiorite-porphyry and related molybdenum ores are precisely redefined by LA-ICP-MS zircon U-Pb dating and molybdenite Re-Os dating methods.It shows that the age of ore-forming granodiorite-porphyry is 224.68 Ma±0.88 Ma,and the Re-Os isochron age of molybdenites is 223.5 Ma±1.3 Ma(MSWD=0.66)with a weighted average model age of 224.0 Ma+1.5 Ma(MSWD=1.8).The isochron age represents the crystallization time of molybdenite,and the Halongxiuma deposit was formed in the late Triassic,a little later than molybdenum metallogenic epoch in the western section of the East Kunlun(middle Triassic).It reveals that molybdenite Re and 187 Re contents range from 4.37×10~(-6) to 38.26×10~(-6),from 2.43×10~(-6) to 24.05×10~(-6),similar to that from crust-mantle mixed source.Therefore,the Halongxiuma molybdenum(tungsten)deposit in the east section of the East Kunlun belt have the crust-mantle mixed source of ore-forming materials,which is consistent with the strong crustmantle-interaction background in late Triassic in the area.
Halongxiuma molybdenum(tungsten)deposit in the east section of the East Kunlun belt is a porphyry type deposit.Based on the study of metallogenic geological characteristics of deposit,it is recognized that the granodiorite porphyry is closely related to mineralization.The rockforming and ore-forming ages of the granodiorite-porphyry and related molybdenum ores are precisely redefined by LA-ICP-MS zircon U-Pb dating and molybdenite Re-Os dating methods.It shows that the age of ore-forming granodiorite-porphyry is 224.68 Ma±0.88 Ma,and the Re-Os isochron age of molybdenites is 223.5 Ma±1.3 Ma(MSWD=0.66)with a weighted average model age of 224.0 Ma+1.5 Ma(MSWD=1.8).The isochron age represents the crystallization time of molybdenite,and the Halongxiuma deposit was formed in the late Triassic,a little later than molybdenum metallogenic epoch in the western section of the East Kunlun(middle Triassic).It reveals that molybdenite Re and 187 Re contents range from 4.37×10~(-6) to 38.26×10~(-6),from 2.43×10~(-6) to 24.05×10~(-6),similar to that from crust-mantle mixed source.Therefore,the Halongxiuma molybdenum(tungsten)deposit in the east section of the East Kunlun belt have the crust-mantle mixed source of ore-forming materials,which is consistent with the strong crustmantle-interaction background in late Triassic in the area.
引文
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(1)青海省地质调查院.青海省都兰县察汗乌苏河地区六幅1∶5×104区域矿产地质、水系沉积物地球化学及磁法测量综合调查报告[R].青海省国土资源厅1∶5×104区域地质矿产调查项目,2008.
(2)王秉璋.东昆仑成矿带地质构造环境研究[R].国土资源部公益性行业科研专项课题报告,2016.
(3)孙丰月,陈国华,迟效国,等.新疆-青海东昆仑成矿带成矿规律和找矿方向综合研究[R].中国地质调查局地质调查项目成果报告,2003.
[2]朱战挺,马奇明,李新本.哈陇休玛斑岩型钼矿床地质特征及控矿条件[J].质量工程,2014,08(006):289-290.
[3]许庆林.青海东昆仑造山带斑岩型矿床成矿作用研究[D].吉林大学,2014,85-90.
[4]向鹏.青海省加当根斑岩型铜(钼)矿床成矿特征及成矿条件研究[D].中国地质大学(武汉),2011.
[5]宋忠宝,张雨莲,陈向阳,等.东昆仑哈日扎含矿花岗闪长斑岩LA-ICP-MS锆石U-Pb定年及地质意义[J].矿床地质,2013,32(1):157-168.
[6]黄汲清,任纪舜,姜春发,等.中国大地构造基本轮廓[J].地质学报,1977,2:117-135.
[7]青海省地质矿产局.青海省区域地质志[M].北京:地质出版社,1991,1-662.
[8]袁万明,莫宣学,喻学慧,等.东昆仑印支期区域构造背景的花岗岩记录[J].地质论评,2000,46(2):203-211.
[9]莫宣学,罗照华,邓晋福,等.东昆仑造山带花岗岩及地壳生长[J].高校地质学校,2007,13(3):403-414.
[10]Anderson T.Correction of common lead in U-Pb analyses that do not report 204Pb[J].Chem Geochemistry,2002,192:59-79.
[11]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.
[12]Belousova E,Griffin W,O′Reilly S Y,et al.Igneous zircon:Trace element composition as an indicator of source rock type:Contributions to Mineralogy and Petrology,2002,143(5):602-622.
[13]Stein H J,Sundblad K,Markey R,et al.Re-Os ages for Archean molybdenite and pyrite,Kuittila-Kiviso,Finland and Proterozoic molybdenite,Kabelia,i Lithuania:Testing the chronometer in a metamorphic and metasomatic setting.Mineral Deposita,1998,33:329-345.
[14]Selby D,Creaser R A,Hart C J.Absolute timing of sulfide and gold mineralisation:A comparison of Re-Os molybdenite and Ar-Armica methods from the Tintina Gold Belt,Alaska.Geology,2002,30:791-794
[15]佘宏全,张德全,景向阳,等.青海省乌兰乌珠尔斑岩铜矿床地质特征与成因[J].中国地质,2007,34(2):306-312.
[16]李世金,孙丰月,丰成友,等.青海东昆仑鸭子沟多金属矿的成矿年代学研究[J].地质学报,2008,82(7):949-955.
[17]王松,丰成友,李世金,等.青海祁漫塔格卡尔却卡铜多金属矿区花岗闪长岩锆石SHRIMPU-Pb测年及其地质意义[J].中国地质,2009,36(1):74-84.
[18]李积清,陈静,史青瑞,等.东昆仑卡尔却卡矿区似斑状二长花岗岩成因:锆石U-Pb年龄及Sr-Nd同位素制约[J].矿物岩石,2016,36(3):87-95.
[19]陈静,谢智勇,李彬,等.东昆仑拉陵灶火钼多金属矿床含矿岩体地质地球化学特征及其成矿意义[J].地质与勘探,2013,49(5):813-824.
[20]王富春,李彬,陈静,等.东昆仑拉陵灶火钼多金属矿床地质特征及辉钼矿Re-Os同位素定年[J].中国地质,2013,40(04):1 209-1 218.
[21]Stein H J,Markey R J,Morgan JW,et al.The remarkable Re-Os chronometer inmolybdenite:How and why it works[J].Terra Nova,2001,13(6):479-486.
[22]Mao Jingwen,Zhang Z C,Zhang Z H.Re-Os isotopic datingof molybdenites in the Xiaoliugou W(Mo)deposit in thenorthern Qilian Mountains and its geological significance[J].Geochimica et Cosmochimica Acta,1999,63(11-12):1 815-1 818.
[23]王秉璋.祁漫塔格地质走廊域古生代-中生代火成岩岩石构造组合研究[C].中国地质大学(北京),2011,85-90.
(1)青海省地质调查院.青海省都兰县察汗乌苏河地区六幅1∶5×104区域矿产地质、水系沉积物地球化学及磁法测量综合调查报告[R].青海省国土资源厅1∶5×104区域地质矿产调查项目,2008.
(2)王秉璋.东昆仑成矿带地质构造环境研究[R].国土资源部公益性行业科研专项课题报告,2016.
(3)孙丰月,陈国华,迟效国,等.新疆-青海东昆仑成矿带成矿规律和找矿方向综合研究[R].中国地质调查局地质调查项目成果报告,2003.