LA-ICP-MS Zircon U-Pb Dating of Alkali-Feldspar Granites from the Dawan Mo-Be Deposit, Xiapu, Fujian Province
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摘要: 福建霞浦大湾钼铍矿床产于火山岩区，但成矿作用可能与岩浆活动和裂隙构造关系密切。为查清矿区隐伏的钠长石化碱长花岗岩与钼铍矿成矿作用之间的关系，本文运用激光剥蚀电感耦合等离子体质谱法（LA-ICP-MS）对碱长花岗岩进行锆石U-Pb测年研究，获得年龄结果为93.0±0.6 Ma，与矿区的辉钼矿成矿年龄（92.2±1.3 Ma）一致，表明碱长花岗岩与钼铍矿成矿作用时空上具有密切的成因联系，岩浆活动可能为矿区钼铍矿的形成提供了成矿物质和成矿流体。结合区域上的成岩成矿年代学数据，本研究认为福建省燕山期岩浆活动时代与钼铍矿成矿时代都具有从西向东逐渐变新的时空分布规律，钼铍矿的成矿地质构造背景为燕山期华南岩石圈伸展环境。Abstract:
BACKGROUND The Mo-Be deposit in Xiapu Dawan, Fujian Province is located in a volcanic rock area. Mineralization may be closely related to magmatic activity and fracture structure. The concealed granite in the deposit is considered to be the parent rock of Mo-Be ore, but there is no direct time evidence. OBJECTIVES To determine the relationship between albite alkali-feldspar granite and Mo-Be mineralization in this deposit by the geochronology of alkali-feldspar granite. METHODS LA-ICP-MS was used for zircon U-Pb dating of alkali-feldspar granite. RESULTS The results show that the U-Pb age of alkali-feldspar granite is 93.0±0.6 Ma, consistent with that of molybdenum mineralization in this deposit (92.2±1.3 Ma), which indicates that the alkali-feldspar granite is closely related to the mineralization of Mo and Be in time and space. Magmatic activity may provide ore-forming materials and fluids for the Mo-Be ore deposits. CONCLUSIONS The Upper Yanshanian magmatic age and the Mo mineralization age in Fujian Province have the temporal and spatial distribution regularity that becomes gradually younger from west to east. The Mo-Be deposit occurred in the extension of the South China lithosphere during the Yanshanian period. -
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表 1 大湾钼铍矿钠长石化碱长花岗岩锆石LA-ICP-MS U-Pb分析结果
Table 1. Zircon LA-ICP-MS dating results of alkali-feldspar granite of Dawan Mo-Be deposit
Z1308号
样品分析点含量(10-6) 同位素比值 年龄(Ma) 232Th 238U Th/U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 139.7 158.9 0.88 0.0501 0.0034 0.0992 0.0063 0.0148 0.0003 211.2 157.4 96.0 5.8 94.4 2.0 2 72.3 93.7 0.77 0.0873 0.0133 0.1766 0.0278 0.0147 0.0006 1368.5 296.3 165.1 24.0 94.3 3.8 3 167.5 313.1 0.53 0.0575 0.0035 0.1166 0.0079 0.0147 0.0003 522.3 133.3 112.0 7.2 93.9 1.6 4 136.1 113.9 1.19 0.0777 0.0074 0.1438 0.0122 0.0144 0.0004 1138.9 190.7 136.5 10.8 92.0 2.4 5 232.5 380.2 0.61 0.0495 0.0023 0.0975 0.0045 0.0144 0.0002 172.3 107.4 94.4 4.2 92.4 1.2 6 62.4 53.0 1.18 0.0811 0.0114 0.1558 0.0164 0.0152 0.0008 1233.3 277.8 147.0 14.4 97.1 5.3 7 77.3 88.6 0.87 0.0726 0.0055 0.1417 0.0099 0.0147 0.0004 1003.4 155.3 134.6 8.8 93.8 2.4 8 171.9 234.6 0.73 0.0597 0.0053 0.1153 0.0083 0.0150 0.0003 594.5 194.4 110.8 7.5 95.8 2.1 9 50.0 43.9 1.14 0.1554 0.0249 0.2877 0.0377 0.0146 0.0005 2405.9 274.8 256.8 29.7 93.1 3.0 10 271.9 419.9 0.65 0.0524 0.0022 0.1032 0.0041 0.0144 0.0002 301.9 91.70 99.8 3.8 92.1 1.2 11 152.1 137.6 1.11 0.0571 0.0044 0.1122 0.0081 0.0147 0.0003 494.5 167.6 108.0 7.4 94.0 2.2 12 172.5 174.8 0.99 0.0641 0.0042 0.1273 0.0083 0.0148 0.0003 744.1 139.3 121.7 7.4 94.7 1.7 13 202.4 286.1 0.71 0.0503 0.0024 0.1032 0.0052 0.0149 0.0002 209.3 110.2 99.7 4.8 95.4 1.2 14 101.0 114.0 0.89 0.0557 0.0077 0.1067 0.0128 0.0148 0.0006 438.9 312.9 102.9 11.7 94.9 3.9 15 75.6 117.9 0.64 0.0649 0.0055 0.1243 0.0095 0.0147 0.0005 772.2 178.5 119.0 8.6 94.3 3.4 16 97.7 91.8 1.06 0.0754 0.0062 0.1383 0.0104 0.0144 0.0004 1079.6 166.7 131.5 9.3 91.9 2.4 17 296.4 576.4 0.51 0.0518 0.0029 0.0998 0.0064 0.0139 0.0003 276.0 162.0 96.6 5.9 89.2 1.6 18 124.4 136.3 0.91 0.1220 0.0107 0.2458 0.0212 0.0144 0.0004 1987.0 189.7 223.1 17.3 92.3 2.7 19 278.2 359.0 0.77 0.0504 0.0025 0.0989 0.0048 0.0145 0.0002 213.0 113.9 95.8 4.4 92.5 1.3 
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表 2 福建省东部—西部部分钼矿床年龄
Table 2. Chronological table of some Mo deposits from east to west in Fujian Province
序号 矿床名称 成矿年龄(Ma) 测试方法 资料来源 1 福建砺山钼矿 91.7±4.9 Re-Os
同位素王成辉等
(2009)[17]2 福建大湾钼铍矿 92.2±1.3 Re-Os
同位素赵芝等
(2012)[13]3 福建紫金山
罗卜岭铜钼矿104.9±1.6 Re-Os
同位素梁清玲等
(2012)[11]4 福建福安
赤路钼矿105~106 Re-Os
同位素张克尧等
(2006)[23]5 福建武夷山
坪地钼矿107.4±3.3 Re-Os
同位素王翠芝等
(2012)[6]6 福建漳平北坑场
钼多金属矿139.8±2.3~
143.7±2.1Re-Os
同位素张达等
(2010)[7]7 福建平和福里石
铍(钼)矿151.62±0.92 Re-Os
同位素黄新鹏
(2016)[12]8 福建永定
山口钼矿165.3±3.5 Re-Os
同位素罗锦昌等
(2009)[9]
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