冀东峪耳崖金矿区闪长岩脉的锆石U-Pb年龄测定
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摘要
冀东峪耳崖金矿区的闪长岩脉侵入到赋矿峪耳崖花岗岩及高于庄组地层中,花岗岩的年龄被确定为174~175 Ma。本次研究选择了峪耳崖金矿区中3件闪长岩脉样品进行锆石U-Pb年龄测定,样品的阴极发光图像显示锆石大部分为自形—半自形的粒状或短柱状,具有典型的岩浆振荡生长环带,锆石Th/U值几乎全部介于0.24~1.68,属岩浆结晶成因;测年结果显示,该区闪长岩脉于晚侏罗世侵位,其中沿着金矿体平行产出的黑云母石英闪长岩脉锆石U-Pb年龄为162.4 Ma±2.7 Ma,切穿金矿体的角闪闪长岩脉锆石U-Pb年龄为154.5 Ma±5.2 Ma,由此推测峪耳崖金矿床形成于154~162 Ma的晚侏罗世。
Diorite dikes of Yu'erya Gold District in eastern Hebei province intruded into Yu'erya Early Middle Jurassic gold-bearing granites,which are dated to be 174 Ma to 175 Ma,and Gaoyuzhuang formation strata. Zircon U-Pb dating are reported for 3 diorite dike samples in Yu'erya Gold District. The CL images show that the zircon is mostly euhedral-subhedral in shape and has typical magmatic oscillatory growth zoning; Almost all Th / U ratios are between0. 24 and 1. 68,implying the magmatic crystallization origin of zircons. The dating results indicate that the intrusion of diorite dikes from Yu'erya Gold District took place in the Late Jurassic. The U-Pb age of zircons from the biotite quartz diorite dike parallel to gold-bearing ore bodies is 162. 4 Ma ± 2. 7 Ma,while the U-Pb age of zircons from amphibolites diorite intersecting gold-bearing ore bodies is 154. 5 Ma ± 5. 2 Ma,suggesting that the gold mineralization took place in the Late Jurassic 154 Ma to 162 Ma age.
Diorite dikes of Yu'erya Gold District in eastern Hebei province intruded into Yu'erya Early Middle Jurassic gold-bearing granites,which are dated to be 174 Ma to 175 Ma,and Gaoyuzhuang formation strata. Zircon U-Pb dating are reported for 3 diorite dike samples in Yu'erya Gold District. The CL images show that the zircon is mostly euhedral-subhedral in shape and has typical magmatic oscillatory growth zoning; Almost all Th / U ratios are between0. 24 and 1. 68,implying the magmatic crystallization origin of zircons. The dating results indicate that the intrusion of diorite dikes from Yu'erya Gold District took place in the Late Jurassic. The U-Pb age of zircons from the biotite quartz diorite dike parallel to gold-bearing ore bodies is 162. 4 Ma ± 2. 7 Ma,while the U-Pb age of zircons from amphibolites diorite intersecting gold-bearing ore bodies is 154. 5 Ma ± 5. 2 Ma,suggesting that the gold mineralization took place in the Late Jurassic 154 Ma to 162 Ma age.
引文
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[2]牛树银,孙爱群,王礼胜,等.冀东峪耳崖金矿成矿控矿构造研究[J].地球学报,2000,21(3):236-244.
[3]任广智,赵玉锁,肖振,等.河北峪耳崖金矿床矿体赋存规律及找矿预测[J].黄金科学技术,2010,18(4):27-32.
[4]杨付领,牛宝贵,任纪舜,等.马兰峪背斜核部中生代侵入岩体锆石U-Pb年龄、地球化学特征及其构造意义[J].地球学报,2015,36(4):455-465.
[5]马君.冀东马兰峪隆起核部中生代中酸性侵入岩岩石地球化学特征及构造意义[D].北京:中国地质大学(北京),2009.
[6]徐希阳,姜能,范文博,等.冀东青龙地区中生代花岗岩的岩石成因和地质意义[J].岩石学报,2016,32(1):212-232.
[7]李颖,刘连登.河北峪耳崖和牛心山金矿的对比研究及意义[J].黄金地质,1999,5(2):9-13.
[8]梅燕雄.冀东金矿成矿特征及成矿演化[D].北京:中国地质科学院,1997.
[9]罗镇宽,裘有守,关康,等.冀东峪耳崖和牛心山花岗岩体SHRIMP锆石U-Pb定年及其意义[J].矿物岩石地球化学通报,2001,20(4):278-285.
[10]贾三石,王恩德,付建飞,等.冀东峪耳崖金矿床成矿地质特征、矿床地球化学及其成因机制探析[J].吉林大学学报(地球科学版),2014,44(3):774-785.
[11]陈绍聪,叶会寿,王义天,等.冀东峪耳崖金矿床辉钼矿Re-Os年龄及其地质意义[J].中国地质,2014,41(5):1 565-1 576.
[12]Liu C,Nie F,Bagas L.Geology and ore genesis of the Yu'erya gold deposit,eastern Hebei Province,China[J].Ore Geology Reviews,2015,73:270-283.
[13]孙德有,杨言辰,韩世炯,等.冀东峪耳崖金矿床成矿地质条件及深部和外围成矿预测研究项目报告[R].北京:中国黄金集团资源有限公司,2016.