SHRIMP Zircon U-Pb Dating of Chajian Mafic-Ultramafic Rocks in Hongqiling Mine Field, Jilin Province, and Its Implications
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摘要: 茶尖1号岩体是茶尖矿床主要成矿岩体，其岩相组合为辉石橄榄岩、橄榄辉石角闪岩、角闪辉岩、辉长岩和闪长伟晶岩.辉长岩的锆石SHRIMP U-Pb测年结果表明，茶尖镁铁-超镁铁岩的形成时代为239.6±2.6 Ma，属于印支期.结合红旗岭矿田已有年代学数据显示，红旗岭矿田成矿岩体形成时代具有由西南至东北依次变新的趋势.茶尖1号岩体的形成年龄明显早于红旗岭成矿岩体，矿床形成年龄差最大可达20 Ma，红旗岭矿区的镁铁-超镁铁岩浆的活动时间应开始于240 Ma之前且持续时间较长.茶尖矿床1号岩体中发现的捕获锆石核年龄为1.7 Ga和0.6 Ga，为镁铁-超镁铁岩浆混入地壳物质提供了直接证据.捕获锆石年龄与华北地台新元古代和中元古代构造－热事件相对应，表明其来源为华北地台基底.Abstract: Chajian No.1 rock mass is the main ore-forming rock mass in Chajian deposit, its lithofacies include pyroxene-peridotite, olivine-pyroxene-amphibolite, Hornblende-pyroxenite, gabbro and diorite-pegmatite.The results of gabbro zircon SHRIMP U-Pb dating show that mafic-ultramafic rock masses formed in the Late Triassic and the age is 239.6±2.6 Ma. The existing age data of mafic-ultramafic rocks indicate that the formation age of the rock masses become new in turn from southwest to northeast. The formation age of Chajian No.1 rock mass is earlier than that of Hongqiling rock mass significantly, age difference between them can reach 20 Ma. Mafic-ultramafic magmatism activities in Hongqiling district began before 240 Ma and lasted for a long time. The finding of 1.7 Ga and 0.6 Ga zircon cores is direct evidence of magma mixed with crustal material. The ages of captured zircons are corresponding with those of Neoproterozoic and Mesoproterozoic tectonic heat events in the North China Platform, suggesting that their origin is North China platform basement.
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Key words:
- gabbro /
- geochronology /
- mafic-ultramafic rocks /
- Chajian deposit
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图 1 红旗岭矿田地质简图(据Wu et al., 2004修改)
1.中新生代盖层；2.中生代花岗岩；3.晚古生代地层；4.早古生代地层；5.石榴石片岩、红柱石片岩；6.燕山早期花岗岩、白岗质花岗岩；7.燕山晚期花岗岩；8.海西期花岗岩；9.花岗闪长岩；10.闪长岩；11.石英斑岩；12.镁铁-超镁铁质岩体及编号；13.正断层；14.不整合界线
Fig. 1. Simplified geological map of Hongqiling orefield
图 2 茶尖矿床1号岩体22.5线剖面
1.辉长岩；2.辉绿岩；3.铜镍矿体；4.橄榄辉石角闪岩；5.角闪辉石岩；6.花岗岩
Fig. 2. Profile of No.1 rock mass along exploration line 22.5 in the Chajian ore district
图 3 辉长岩图片和正交偏光镜下照片
Cpx.单斜辉石，Opx.斜方辉石，Pl.斜长石
Fig. 3. Photographs and under cross polarized light of gabbro
表 1 茶尖1号岩体辉长岩锆石SHRIMP U-Pb分析结果
Table 1. SHRIMP U-Pb data on zircons for the gabbro of Chajian No.1 rock mass
Spot 206Pbc(%) U(10-6) Th(10-6) 232Th/238U 206Pb*(10-6) 206Pb/238U年龄(Ma) 207Pb*/206Pb* ±% 207Pb*/235U ±% 206Pb*/238U ±% err corr CJ1.1 0.90 317 93 0.30 10.40 240.4±4.1 0.051 5 5.0 0.265 7.5 0.038 00 1.7 0.229 CJ2.1 2.10 122 41 0.35 4.23 250.4±11.4 0.046 3 10.0 0.275 20.0 0.039 60 4.6 0.229 CJ3.1 1.85 174 65 0.39 5.75 238.6± 4.8 0.051 3 5.6 0.261 9.6 0.037 70 2.1 0.215 CJ4.1 1.22 308 102 0.34 10.20 241.4± 4.1 0.050 7 4.2 0.258 6.8 0.038 16 1.7 0.255 CJ5.1 1.19 109 22 0.21 3.84 257.2±5.5 0.052 6 9.7 0.370 9.6 0.040 71 2.2 0.228 CJ6.1 0.00 629 360 0.59 19.80 232.1±3.5 0.051 1 3.8 0.281 3.8 0.036 65 1.6 0.412 CJ7.1 0.40 663 588 0.92 20.50 227.2±3.4 0.050 4 2.4 0.228 3.6 0.035 88 1.5 0.428 CJ8.1 0.28 290 99 0.35 10.00 253.7±4.3 0.052 9 5.3 0.320 5.7 0.040 13 1.7 0.305 CJ9.1 0.12 325 56 0.18 86.30 1 735.0±24.0 0.113 0 0.95 4.755 1.9 0.308 80 1.6 0.858 CJ9.2 0.15 930 123 0.14 29.30 231.8±3.8 0.049 1 2.1 0.252 2.7 0.036 61 1.7 0.618 CJ10.1 0.34 519 181 0.36 16.80 238.3±3.7 0.048 9 3.2 0.281 4.0 0.037 66 1.6 0.402 CJ11.1 2.46 259 77 0.31 8.67 240.0±4.6 0.044 9 5.2 0.189 21.0 0.037 94 2.0 0.091 CJ12.1 0.46 357 67 0.19 32.50 646.4±9.9 0.101 5 1.4 1.393 2.6 0.105 50 1.6 0.618 CJ12.2 0.35 641 82 0.13 21.40 244.9±3.7 0.049 1 2.8 0.266 3.4 0.038 73 1.6 0.462 CJ13.1 1.83 298 68 0.24 10.00 243.1±4.1 0.048 0 4.3 0.230 8.0 0.038 43 1.7 0.216 CJ14.1 0.23 339 96 0.29 11.50 249.0±4.3 0.048 1 4.1 0.298 4.5 0.039 39 1.8 0.391 注：Pbc和Pb*分别表示普通铅和放射性铅，采用年龄为206Pb/238U年龄. 
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表 2 红旗岭矿田主要成矿岩体年龄数据统计
Table 2. Statistics of mineralizing rock mass age data in Hongqiling mine field
矿床 岩体 测试对象 测试方法 年龄(Ma) 资料来源 1号岩体 辉长岩 SHRIMP 216±5 Ma 张广良和吴福元，2005 1号岩体 黑云母 40Ar-39Ar 225 Ma 郗爱华等，2005 红旗岭矿床 1号岩体 橄榄辉石岩 U-Pb 220.6±2.0 Ma 冯光英等，2011 2号岩体 辉长岩 SHRIMP 212.5±2.8 Ma 7号岩体 磁黄铁矿 Re-Os 208±21 Ma Lü et al., 2011 三道岗矿床 1号岩体 辉石岩 U-Pb 232.75±0.95 Ma 汪志刚等，2011 茶尖矿床 1号岩体 辉长岩 SHRIMP 239.6± 2.6 Ma 本文
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表 3 茶尖1号岩体微量元素Nb、Th、La分析结果
Table 3. Analysis results of trace elements Nb, Th, La in Chajian No.1 rock mass
名称 闪长伟晶岩 辉长岩 角闪辉石岩 辉石橄榄岩 角闪橄榄岩 Nb 1.83 1.84 4.56 2.01 1.79 Th 1.41 1.37 4.79 1.29 1.08 La 6.07 5.59 17.54 4.39 2.57 La/Nb 3.31 3.04 3.84 2.18 1.43 (Th/Nb)N 6.48 6.25 8.80 5.38 5.05 注：表中元素由中国地质科学院地球物理地球化学勘查研究所测试中心测试完成；微量元素单位为10-6；(Th/Nb)N为原始地幔标准化Th/Nb值.
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