40Ar-39Ar Dating of Muscovite from the Zhaojinggou Nb-Ta Polymetallic Deposit in Wuchuan County of Inner Mongolia and Its Geological Implications
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摘要: 内蒙古赵井沟铌钽多金属矿是近年来取得较大找矿进展的大型稀有金属矿床,初步探明铌钽氧化物储量超过8200吨,前人对其矿床地质特征已有初步研究,但其成矿时代尚未精确厘定。本文以赵井沟铌钽多金属矿区内天河石花岗伟晶岩脉中的白云母为研究对象,利用40Ar-39Ar同位素年代学方法,以确定其成矿时代。研究发现矿区内铌钽矿化主要赋存在碱长花岗岩、碱长花岗细晶岩、云英岩和天河石花岗伟晶岩中,且铌钽矿物与白云母同时形成,有重要的共生关系,故本次研究获得的白云母坪年龄123.57±0.66 Ma和等时线年龄124.0±2.0 Ma具有地质意义,可代表成矿年龄。这一成果表明赵井沟铌钽多金属矿床形成于燕山晚期(至少延续至早白垩世),与前人获得的锆石年龄有较大差异,这对分析其矿床成因有重要意义。同时,结合区域地质资料,本文认为华北地台北缘内蒙古地轴中部在燕山运动的晚期存在一次重要的稀有金属成矿事件。
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关键词:
- 铌钽多金属矿床 /
- 天河石花岗伟晶岩 /
- 白云母 /
- 40Ar-39Ar同位素年龄 /
- 赵井沟
Abstract: The Zhaojinggou Nb-Ta polymetallic deposit in Inner Mongolia is a newly discovered large rare metal ore deposit. The reserve of Nb-Ta oxides is more than 8200 tons. Previous studyfocus on geological features of this deposit, but they the precise mineralization age remains unknown. In this paper, muscovite in amazonite granite pegmatite was used to constrain the timing of mineralization using 40Ar-39Ar isotope method. Results show that Nb-Ta mineralization is mainly hosted in alkali-feldspar granite, alkali-feldspar aplite, greisen, and amazonite granite pegmatite. According to the geologicalrelationship between Nb-Ta minerals and muscovite, we can infer that Nb-Ta minerals and muscovite are formed at the same time. Thus, the muscovite plateau ages of 123.57±0.66 Ma and 124.0±2.0 Ma can represent the mineralization age. Results show that the Zhaojinggou Nb-Ta polymetallic deposit was formed at late Yanshanian (or at least Early Cretaceous), the 40Ar-39Ar age have bigger difference with the zircon age, which is of great importance for ore genesis. Combining with regional geology, the author thinks that an essential rare-metal mineralization happened in the middle part of inner Mongolian axis on the north margin of north china platform during the late Yanshan movement. -
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图 1 内蒙古呼和浩特武川区域地质简图(据文献[3, 7]改编)
1—太古代变质岩;2—元古代变质火山-沉积岩;3—中生代地层;4—太古代岩浆岩;5—元古代岩浆岩;6—早古生代岩浆岩;7—晚古生代变质岩;8—中生代岩浆岩;9—第四系;10—断裂;11—金矿床(点);12—赵井沟铌钽矿。(1)—东伙房金矿床;(2)—牌楼金矿点;(3)—鹿场金矿床;(4)—摩天岭金矿床;(5)—哈拉沁金矿点;(6)—卯独庆金矿床;(7)—新地沟金矿床;(8)—大汗青金矿点。
Figure 1. Simplified regional geological map of Hohhot—Wuchuan area, central Inner Mongolia (Modified from Reference [3, 7])
图 2 内蒙古武川县赵井沟铌钽矿床(a)地质略图及(b)第Ⅲ号地质勘探线剖面简图(据文献[3]改编)
1—第四系;2—中石炭统拴马庄组变质长石砂岩;3—中石炭统中石炭统拴马庄组变质砾岩;4—碱长花岗伟晶岩;5—碱长花岗细晶岩;6—云英岩;7—碱长花岗岩(含天河石);8—铌钽矿体;9—含钨石英脉;10—实测和推测断层。
Figure 2. (a)Simplified geological map of the Zhaojinggou Nb-Ta deposit and (b) Section diagram of No.Ⅲ exploration line, Wuchuan County, Inner Mongolia (Modified from Reference [3])
表 1 内蒙古赵井沟矿区白云母40Ar-39Ar同位素测年结果
Table 1 40Ar-39Ar isotopic dating results of the muscovite of the Zhaojinggou Nb-Ta polymetallic deposit, Inner Mongolia
T(℃) (40Ar/39Ar)m (36Ar/39Ar)m (37Ar/39Ar)m (38Ar/39Ar)m 40Ar(%) 39Ar(10-14 mol) 39Ar积累(%) 年龄(Ma) ±1σ(Ma) 700 30.0152 0.0743 0.0000 0.0292 26.81 0.29 0.68 71.2 1.8 800 14.6119 0.0053 0.0000 0.0134 89.25 2.25 5.96 114.0 1.1 850 14.3507 0.0012 0.0000 0.0127 97.54 2.32 11.41 122.1 1.2 900 14.3671 0.0009 0.0000 0.0125 98.17 2.69 17.75 123.0 1.2 950 14.5290 0.0014 0.0000 0.0128 97.11 2.75 24.21 123.0 1.2 1000 14.8828 0.0023 0.0000 0.0128 95.30 2.94 31.11 123.6 1.2 1040 15.1928 0.0034 0.0000 0.0131 93.38 3.37 39.02 123.7 1.2 1080 15.3639 0.0042 0.0042 0.0134 91.97 3.96 48.32 123.2 1.2 1120 15.2963 0.0037 0.0000 0.0132 92.78 4.13 58.03 123.7 1.2 1160 15.1614 0.0030 0.0000 0.0130 94.04 3.47 66.18 124.3 1.2 1200 15.0755 0.0027 0.0000 0.0129 94.77 4.58 76.95 124.5 1.2 1240 15.1783 0.0030 0.0000 0.0130 94.21 5.31 89.43 124.6 1.2 1280 15.5225 0.0044 0.0170 0.0133 91.56 2.31 94.86 123.9 1.2 1340 15.6267 0.0047 0.0000 0.0131 91.10 0.87 96.91 124.1 1.4 1400 15.4725 0.0047 0.0000 0.0137 91.02 1.10 99.50 122.8 1.2 1430 18.1905 0.0135 0.0000 0.0157 78.09 0.21 100.00 123.8 2.5 注:表中标m代表样品中测定的同位素比值总年龄=122.8 Ma。 -
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