DISCOVERY OF BIOTITE MONZOLITE AND Ar-Ar THERMOCHRONOLOGY SIGNIFICANCE IN LINGLONG GOLD FIELD
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摘要: 胶东玲珑金矿田地表以下2070 m处发现黑云母二长岩，不仅可以探索该区金矿成矿物质的来源，而且对研究矿床成因提供了新的证据。黑云母二长岩在胶东金矿集中区地表及其他钻孔岩芯中尚未见报道，通过显微镜下观察、鉴定，具有典型的二长结构。非金属矿物主要有斜长石、正长石、石英、黑云母和角闪石；含有较多的金属矿物，主要为原生的黄铁矿和磁铁矿等。黑云母的40Ar-39Ar热年代学研究表明，黑云母二长岩的成岩年龄为123.7±1.5 Ma，晚于玲珑花岗岩、滦家河花岗岩和郭家岭花岗岩，与玲珑金矿的形成年龄非常接近。尽管玲珑金矿矿体中的金属矿物并不一定直接来源于黑云母二长岩，但从形成时间分析，二者具有成因联系。黑云母二长岩在侵入过程中可能为金矿的形成提供成矿物质、成矿流体，而且为成矿物质和成矿流体的运移提供能量及驱动力。因而可以推断，黑云母二长岩的侵入与玲珑金矿成矿作用关系密切。Abstract: The biotite monzolite that was discovered at 2170 meters below the surface in Linglong Gold Field in Jiaodong is not only used to find out the source of ore-forming material, but also is used to furnish new evidence for study the cause of mineralization of gold deposit. As the new rock types that was discovered in this area, Biotite monzonitichas the typical monzonitic texture under microscope. The non-metallic minerals composed the rock mainly are plagioclase, sodium feldspar, quartz, biotite and hornblende. It contains more metal minerals that mainly are pyrite and magnetitethan the other magmatic rocks in Northwest of Jiaodong. The biotite 40Ar-39Ar thermochronology indicate that the age of the formation of biotite monzonite is 123.7±1.5 Ma which was later than the time of formation of Linglong granite, Luanjiahe granite and Guojialing granites, and is very close with the age of the formation of Linglong Gold Deposit. Although it is not sure that the metal minerals in the gold ore bodies in Linglong gold field directly come from biotite monzonite, the result of analysis of the characteristics of their generation time demonstrate that the metal minerals and biotite monzonite form in the same period and come from the same originate. In the process of invasion of the Biotite monzonite magma, it supply ore-forming materials for the formation of gold mine, and provides energy and driving force for ore-forming elements and ore-forming fluid migration. It can be deduced that the gold mineralization is closely related with the intrusion of biotite monzonite
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图 1 招平断裂带、焦家断裂带主要金矿床分布图
1—第四系；2—元古代地层；3—太古代地层；4—玲珑黑云母花岗岩；5—滦家河二长花岗岩；
6—郭家岭花岗闪长岩；7—艾山花岗岩；8—断裂；9—金矿床；10—地名Figure 1. Location of the major gold deposits in Zhaoping fault and Jiaojia fault
图 2 玲珑金矿田构造地质图
1—太古代粉子山群；2—玲珑黑云母花岗岩；3—滦家河二长花岗岩；4—脉岩；5—蚀变花岗岩；
6—断裂；7—蚀变岩型金矿体；8—石英脉型金矿体；9—钻孔及编号；10—居民点Figure 2. Sketch map of structures and geology in Linglong Gold Field
图 3 玲珑金矿田72线剖面及样品采集位置
1-玲珑黑云母花岗岩；2-推测黑云母二长岩；3-钾化花岗岩；4-绢云母化-硅化花岗岩；5-金矿体；6-主断裂面及两盘运动方向；7-钻孔及编号；8-取样位置
Figure 3. Section of the Line 72 in Linglong Gold Field and sample location
图 6 黑云母二长岩显微结构照片
A, C—单偏镜下黑云母二长岩的二长结构；B, D—正交镜下黑云母二长岩的二长结构；Pl—斜长石；Bit—黑云母；Or—正长石；Qz—石英；Chl—绿泥石；Py—黄铁矿
Figure 6. Microphotograph of the minerals and texture of biotite monzonite
图 7 黑云母二长岩中金属矿物显微照片
Figure 7. Microphotograph of pyrite and magnetite in biotite monzonite
图 8 蚀变黑云母二长岩显微照片
A—绢云母化黑云母二长岩；B—黑云母二长岩中大理岩化；C, D—硅化绢云母化黑云母二长岩；Pl—斜长石；Bit—黑云母；Or—正长石；Qz—石英；Chl—绿泥石；Ser—绢云母；Cal—方解石
Figure 8. Microphotograph of alteration biotite monzonite
图 9 黑云母二长岩中黑云母40Ar/39Ar年龄谱图和等时线图
Figure 9. 40Ar/39Ar age spectra and 39Ar/40Ar vs. 36Ar/40Ar inverse isochorn diagram of biotite from the biotite in biotite monzonite
表 1 胶东黑云母二长岩、二长花岗岩及花岗细晶岩脉岩石化学成分(%)
Table 1. Chemical composition of biotite monzonite, monzonite granite in Jiaodong
样品编号 ZK1-16 1015-1 1015-2 1012-5 1012-11 岩石名称 黑云母二长岩 滦家河花岗岩 滦家河花岗岩 滦家河花岗岩 细晶岩脉 SiO2 55.95 72.71 72.52 70.06 69.3 Al2O3 17.54 14.54 14.26 15.15 16.05 TiO2 0.78 0.06 0.12 0.36 0.37 Fe2O3 3.14 0.22 1.36 2.42 2.55 FeO 3.22 1.75 1.40 1.63 1.19 CaO 5.74 0.52 0.53 0.78 0.46 MgO 2.41 0.17 0.15 0.37 0.41 K2O 2.99 5.25 4.53 2.19 3.10 Na2O 3.49 3.92 4.08 4.74 3.93 MnO 0.06 0.03 0.03 0.06 0.05 P2O5 0.40 0.02 0.02 0.15 0.13 H2O+ 1.80 0.27 0.61 1.58 1.99 H2O- 0.09 0.12 0.19 0.37 0.39 灼失量 3.85 0.48 0.69 1.76 2.07 总和 99.59 99.68 99.68 99.68 99.62 
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表 2 黑云母二长岩中黑云母阶段升温测年数据
Table 2. The results of 40Ar/39Ar stepwise heating dating for biotite in biotite monzonite
T/
(℃)${{\left( \frac{^{40}\text{Ar}}{^{39}\text{Ar}} \right)}_{\text{m}}}$ ${{\left( \frac{^{36}\text{Ar}}{^{39}\text{Ar}} \right)}_{\text{m}}}$ ${{\left( \frac{^{37}\text{Ar}}{^{39}\text{Ar}} \right)}_{\text{m}}}$ ${{\left( \frac{^{38}\text{Ar}}{^{39}\text{Ar}} \right)}_{\text{m}}}$ 40Ar/% F 39Ar/
(×10 -14mol)39Ar(Cum)/
%Age/
Ma±1σ/
Ma700 96.5965 0.3180 0.4972 0.0885 2.76 2.6687 0.12 0.50 23.5 7.4 800 55.8444 0.1529 0.2025 0.0519 19.12 10.6804 1.49 6.98 92.4 1.4 840 19.0382 0.0171 0.0989 0.0258 73.44 13.9828 1.61 13.96 120.0 1.4 880 16.6376 0.0076 0.0352 0.0231 86.45 14.3830 1.83 21.91 123.3 1.3 920 15.9413 0.0047 0.0468 0.0226 91.21 14.5412 1.67 29.19 124.6 1.6 960 16.0929 0.0051 0.0398 0.0224 90.57 14.5756 1.60 36.13 124.9 1.6 1000 16.1686 0.0034 0.0000 0.0214 93.82 15.1695 2.07 45.11 129.8 1.4 1040 15.4683 0.0030 0.0309 0.0222 94.25 14.5795 3.22 59.08 124.9 1.3 1080 15.1447 0.0025 0.0196 0.0218 95.13 14.4072 3.14 72.71 123.5 1.4 1120 14.8859 0.0019 0.0179 0.0222 96.28 14.3318 3.67 88.63 122.9 1.2 1160 14.8145 0.0027 0.0985 0.0231 94.63 14.0193 2.36 98.88 120.3 1.3 1200 18.1637 0.0093 0.0815 0.0241 84.87 15.4159 0.25 99.96 131.9 5.9 1400 172.8819 0.4922 0.0000 0.0285 15.87 27.4429 0.01 100.00 228 273 总气体年龄=121.4 Ma 注：表中下标m代表样品中测定的同位素比值；F=40Ar*/39Ar，指放射成因40Ar与K生成39Ar的比值；测试由中国地质科学院地质研究所完成
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