Metallogenic epoch and ore-forming material source of the Tongshanling Pb-Zn polymetallic deposit in southeastern Hu'nan Province:Evidence from Sm-Nd isochron age and Pb isotope
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摘要:
铜山岭铅锌多金属矿床位于扬子地块湘南-桂东北坳陷与华夏地块粤北坳陷的拼贴部位，是中国南岭多金属成矿区代表性矿床之一。为确定矿床成矿时代，挑选铜山岭铅锌多金属矿床中含矿矽卡岩的石榴子石进行Sm-Nd同位素定年，获得的等时线年龄为173±3Ma，指示成矿作用发生于燕山早期。对金属硫化物矿物进行了Pb同位素分析，其206Pb/204Pb、207Pb/204Pb、208Pb/204Pb平均值分别为18.602、15.701、38.729，表明成矿物质来源于相对富集铀铅、略微亏损钍铅的上地壳源区。从（207Pb/204Pb）i-（206Pb/204Pb）i铅同位素演化模式图可知，寄主花岗闪长岩是铜山岭铅锌多金属矿床的重要物质来源，且成矿物质中可能含有寄存在花岗闪长岩中的地幔组分。
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关键词:
- 铜山岭铅锌多金属矿床 /
- 成矿时代 /
- 成矿物质来源 /
- Sm-Nd等时线年龄 /
- Pb同位素
Abstract:The Tongshanling Pb-Zn polymetallic deposit is located in the collage part between the southern Hu'nan-northeastern Guangxi depression in the Yangtze Block and the northern Guangdong depression in the Cathaysia Block.It is one of the representa-tive deposits in the Nanling metallogenic province.In order to determine the metallogenic epoch of the Tongshanling Pb-Zn polymetallic deposit, the authors analyzed garnets in mineralized skarn from the deposit using Sm-Nd isotopic system and obtained an isochron age of 173±3Ma which corresponds to early Yanshanian.The metal sulfides were analyzed using Pb isotope compositions and their average ratios of 206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb are 18.602, 15.701 and 38.729, respectively, indicating that they were mainly derived from relatively uranium lead-enriched and slightly thorium lead-defected upper crust.According to analyzing the dia-gram of (207Pb/204Pb)i-(206Pb/204Pb)i, the hosted granodiorite seems to have been an important material source for the Tongshanling PbZn polymetallic deposit.In addition, ore-forming material probably contained mantle components hosted in the granodiorite of the Tongshanling Pb-Zn polymetallic deposit.
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表 1 铜山岭铅锌多金属矿床石榴子石Sm-Nd同位素数据分析结果
Table 1. Sm-Nd isotope compositions of garnets from the TongshanlingPb-Zn polymetallic deposit
样品号 Sm/10-6 Nd/10-6 147Sm/144Nd 143Nd/144Nd 2σ (143Nd/144Nd)t=173Ma TSL-13 0.6108 1.849 0.1999 0.512267 0.000004 0.512041 TSL-10-3 0.4662 1.488 0.1896 0.512254 0.000008 0.512039 TSL-22-1 0.4412 1.565 0.1706 0.512230 0.000007 0.512037 TSL-22-2 1.375 1.774 0.4687 0.512568 0.000005 0.512037 TSL-23 1.392 2.212 0.3808 0.512474 0.000006 0.512043 注:衰变常数λ（147Sm）=6.54×10-12a-1 
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表 2 铜山岭铅锌多金属矿床硫化物矿物Pb同位素数据
Table 2. Pb isotope compositions and relevant parameters of sulfides from the Tongshanling Pb-Zn polymetallic deposit
样品号 测试矿物 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb Δβ Δγ μ Th/U TSL-04 闪锌矿 18.614 15.671 38.750 22.467 41.556 9.58 3.77 TSL-05 闪锌矿 18.609 15.682 38.755 23.184 41.690 9.60 3.78 TSL-06 闪锌矿 18.613 15.671 38.718 22.467 40.696 9.58 3.76 TSL-12 闪锌矿 18.594 15.654 38.663 21.357 39.217 9.55 3.74 TSL-33 黄铜矿 18.165 15.649 38.114 21.096 38.492 9.59 3.73 TSL-06 黄铁矿 18.693 15.714 38.857 25.272 44.432 9.66 3.81 TSL-11 黄铁矿 18.627 15.686 38.772 23.445 42.147 9.61 3.78 TSL-05 方铅矿 18.707 15.798 38.185 22.336 43.760 9.82 3.92 TSL-06 方铅矿 18.640 15.709 38.904 24.946 45.695 9.65 3.83 TSL-12 方铅矿 18.628 15.699 38.853 24.294 44.324 9.64 3.81 TSL-17 方铅矿 18.646 15.712 38.909 25.142 45.829 9.66 3.83 TSL-290-7 方铅矿 18.642 15.732 38.998 26.447 48.222 9.70 3.87 TSL-290-15 方铅矿 18.653 15.736 39.000 26.708 48.275 9.71 3.86 注：Δβ=(β/βM(t)-1)×1000，Δγ=(γ/γM(t)-1)×1000，β为样品的207Pb/204Pb值，γ为样品的208Pb/204Pb值；β=β0+μ0/137.88×(eλ5T -eλ5t)，γ=γ0+μ0k×(eλ2T -eλ2t)，λ5=0.985 ×10-9/a, λ2=0.0495 ×10-9/a；β0 =10.294，γ0 =29.476，232Th/238U= 4.04，T=4.57Ga, k=w/μ0，w=232Th/204Pb, μ0=238U/204Pb；M代表地幔，采用单阶段演化公式计算时间t=173Ma时地幔Pb同位素组成
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表 3 铜山岭铅锌多金属矿床寄主花岗闪长岩石Pb同位素数据
Table 3. Pb isotope compositions of the host granodiorite from the Tongshanling Pb-Zn polymetallic deposit
样品号 测定结果 U/10-6 Th/10-6 Pb/10-6 (206Pb/204Pb)t=173Ma (207Pb/204Pb)t=173Ma (208Pb/204Pb)t=173Ma 206Pb/204Pb 207Pb/204Pb 208Pb/204Pb TSL-40-1 19.121 15.750 39.338 6.19 17.39 22.46 18.660 15.724 38.862 TSL-40-7 19.146 15.764 39.208 10.15 17.02 32.38 18.542 15.717 38.885 TSL41-1 19.149 15.804 39.570 5.20 23.22 35.08 18.749 15.785 39.001 TSL-41-2 19.940 15.778 39.347 5.73 24.60 44.48 18.692 15.766 39.007 注：表中206Pb/204Pb、207Pb/204Pb、208Pb/204Pb、U、Th、Pb的值据参考文献[14]；Pb同位素参数计算采用的年龄为173Ma
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① 湖南省地质调查院. 铜山岭地区锡多金属矿远景调查成果报告. 2010.
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