Zircon U-Pb age, geochemistry and Hf isotopic compositions of quartzdiorite from the Xinliaodong Cu polymetallic deposit in eastern Guangdong Province
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摘要:
新寮岽铜多金属矿是近年来在粤东地区新发现的一个铜矿床。对该矿床中与成矿关系密切的石英闪长岩进行了锆石U-Pb年龄、地球化学、Hf同位素研究，以约束其形成时代和岩石成因。测得石英闪长岩LA-ICP-MS锆石U-Pb年龄为161±1Ma（n=25，MSWD=0.57），被解释为岩体的成岩年龄。地球化学数据显示，石英闪长岩具有碱含量中等（Na2O+K2O=3.99%~5.05%），高镁（MgO=4.53%~4.91%）的特征，属准铝质钙碱性系列。稀土和微量元素特征表明，其富集轻稀土元素和大离子亲石元素（K、Rb、Ba、Th、U），亏损重稀土元素和高场强元素（Nb、Ta、Ti、P），具弱负Eu异常（δEu=0.68~0.76）。电子探针分析结果表明，石英闪长岩中黑云母为镁质黑云母，具环带结构，斜长石为拉长石。锆石Hf同位素分析结果表明，石英闪长岩εHf（t）为-5.8~2.7，tDM2=1.03~1.58Ga。岩石地球化学和锆石Hf同位素组成特征表明，石英闪长岩源区较复杂，为壳幔混合源，可能为俯冲板片部分熔融并与楔形地幔橄榄岩相互作用形成，且岩浆上侵过程中有古老地壳物质的混染。综合岩石地球化学、矿物化学及Hf同位素特征，结合区域构造演化史和前人研究成果，推测岩体形成于俯冲背景下的活动大陆边缘环境。
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关键词:
- 石英闪长岩 /
- LA-ICP-MS锆石U-Pb年龄 /
- Hf同位素 /
- 岩石成因 /
- 粤东地区
Abstract:The Xinliaodong Cu polymetallic deposit is a newly-discovered copper ore deposit in eastern Guangdong Province. In this paper, zircon U-Pb age, geochemistry and zircon Hf isotope of the ore-related quartz-diorite from the Xinliaodong Cu polymetallic ore district were studied to constrain its geochronology and petrogenesis. The zircon LA-ICP-MS dating yielded a concordant age of 161±1Ma (n=25, MSWD=0.57), which is interpreted as the petrogenic age of quartz-diorite. Geochemical data show that the quartz-diorite is magnesium-enriched in composition (MgO=4.53%~4.91%) with moderate content of alkali (Na2O+K2O=3.99%~5.05%). It is a metaluminous granite and belongs to the calc-alkaline series. Its REE and trace elements are characterized by enrichment of LREE and large ion lithophile elements (K, Rb, Ba, Th and U) and depletion of HREE and high-field strength elements (Nb, Ta, Ti and P), with slightly weak negative anomalies of Eu (δEu=0.68~0.76). The results of the electron microprobe analysis show that the biotite from the quartz-diorite belongs to magnesian biotite, whereas the zoned plagioclase belongs to labradorite. The Hf isotope shows that the εHf (t) values of the quartze-diorite range from -5.8 to 2.7, with tDM2 ages between 1.03Ga and 1.58Ga. Geochemistry and zircon Hf isotopic compositions indicate that the parental magmas of the quartz-diorite are rather complex. The diagenetic mass of the pluton was derived from the source of crust-mantle mixture and it might have originated from partial melting of a subducted slab which reacted with mantle wedge peridotites. Besides, the magma was intermingled with ancient crustal material during magmatic ascent. According to petrogeochemistry, mineral chemistry and Hf isotope, combined with the tectonic evolution of the eastern Guangdong Province as well as previous achievements, the authors infer that the quartz-diorite was generated in an active continental margin setting triggered by slab subduction.
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致谢: 成文过程中得到中国地质大学（北京）郑伟博士和中国地质科学院矿产资源研究所杨阳博士的指导，野外地质工作得到广东省地质局第二地质大队的大力支持和帮助，锆石U-Th-Pb同位素测定工作得到南京大学内生金属矿床成矿机制研究国家重点实验室武兵老师的热情指导，中国地质科学院矿产资源研究所电子探针室陈振宇和陈小丹老师在电子探针分析实验过程中给予了热情的指导和帮助，资料收集和数据分析过程中得到中国地质大学（北京）李伟、李正远、曹晶、姚通、张伟等同学的帮助，在此一并表示诚挚的谢意。
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图 1 粤东地区地质略图（据参考文献[16]修改）
Figure 1. Schematic geological map of eastern Guangdong Province
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图 2 新寮岽铜多金属矿区地质简图（据参考文献①修改）
Figure 2. Simplified geological map of the Xinliaodong Cu polymetallic ore district
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图 3 石英闪长岩手标本（a）及典型镜下照片（b，c，d）（+）
a—石英闪长岩呈块状构造; b—斜长石沿黑云母裂隙充填（正交偏光）；c—斜长石呈板状，聚片双晶发育（正交偏光）；d—环带结构斜长石，石英沿斜长石颗粒间充填（正交偏光）。Qtz—石英；Pl—斜长石；Hbl—角闪石；Bt—黑云母
Figure 3. Hand specimen(a)and microscopic photographs(b, c, d)of the quartz-diorite(+)
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图 4 石英闪长岩锆石阴极发光（CL）图像及206Pb/238U年龄
Figure 4. Zircon CL images of quartz-diorite and 206Pb/238U age
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图 5 新寮岽矿床石英闪长岩锆石Th-U关系（a）及U-Pb谐和图（b）
Figure 5. Th versus U plots(a)and zircon U-Pb concordia diagram(b) for the quartz-diorite of the Xinliaodong deposit
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图 7 新寮岽铜多金属矿区石英闪长岩稀土元素球粒陨石标准化图解（a）和微量元素原始地幔标准化蛛网图（b）（标准化值据参考文献[29]）
Figure 7. Chondrite-normalized REE patterns(a)and primitive mantlenormalized trace-element spider diagram(b)of quartz-diorite in the Xinliaodong Cu polymetallic ore district
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图 9 斜长石分类图解及环带状斜长石成分剖面（底图据参考文献[35]）
Qtz—石英；Pl—斜长石
Figure 9. Classification of feldspar and electron microprobe analyses of zoned plagioclase
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图 10 石英闪长岩锆石εHf（t）及其二阶段模式年龄（tDM2）频率分布直方图
Figure 10. Zircon Hf isotopic compositions and secondary model age of the quartz diorite
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图 13 黑云母物质来源判别图（底图据参考文献[56]）
Figure 13. Diagram for discrimination of material source of biotite
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图 14 石英闪长岩的Hf同位素演化图解（底图据参考文献[57]）
（地壳派生物的谐和线为通过假定的平均大陆地壳176Lu/177Hf值为0.015计算得到）
Figure 14. Hf isotope evolution diagram of quartz-diorite
Ⅰ—小于0.83Ga; Ⅱ—0.83~1.1Ga; Ⅲ—1.1~1.4Ga; Ⅳ—1.4~1.6Ga; Ⅴ—1.6~1.9Ga
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图 15 黑云母构造环境判别图（底图据参考文献[71]）
A—非造山的碱性岩系；C—造山带钙碱性岩系；P—过铝质岩系
Figure 15. Discrimination diagram of tectonic settings for biotite
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图 16 石英闪长岩R1-R2多阳离子图解（底图据参考文献[72]）
1—地幔分异花岗岩；2—活动板块边缘花岗岩；3—碰撞后隆起花岗岩；4—造山晚期花岗岩；5—非造山花岗岩；6—同碰撞花岗岩；7—造山后的A型花岗岩
Figure 16. R1 versus R2 multicationic diagram for quartz diorites
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图 17 石英闪长岩构造环境判别图解（底图据参考文献[73]）
syn-COLG—同碰撞花岗岩；VAG—火山弧花岗岩；WPG—板内花岗岩；ORG—洋脊花岗岩
Figure 17. Discrimination diagram for tectonic settings of quartz diorates
表 1 新寮岽铜多金属矿区石英闪长岩（XLDY-005）LA-ICP-MS锆石U-Th-Pb同位素测定结果
Table 1 LA-ICP-MS zircon U-Th-Pb isotopic data of the quartz-diorite (XLDY-005)from the Xinliaodong Cu polymetallic ore district
测点号 含量/10-6 Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th Th U 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄/Ma 1σ 年龄/Ma 1σ 年龄/Ma 1σ 年龄/Ma 1σ 1 1122 880 1.3 0.0491 0.0016 0.1749 0.0056 0.0258 0.0004 0.0077 0.0018 153 75 164 5 164 2 155 35 2 1112 1677 0.7 0.0508 0.0017 0.1737 0.0056 0.0248 0.0004 0.0130 0.0069 230 75 163 5 158 2 260 137 4 3523 2535 1.4 0.0494 0.0014 0.1727 0.0049 0.0253 0.0004 0.0126 0.0060 168 65 162 4 161 2 253 120 6 2730 2603 1.1 0.0495 0.0011 0.1726 0.0038 0.0253 0.0004 0.0110 0.0042 173 51 162 3 161 2 222 83 7 2810 1771 1.6 0.0491 0.0012 0.1746 0.0042 0.0258 0.0004 0.0092 0.0029 154 56 163 4 164 2 185 58 8 2918 1687 1.7 0.0496 0.0023 0.1719 0.0079 0.0251 0.0005 0.0110 0.0067 177 106 161 7 160 3 220 134 9 2231 1398 1.6 0.0492 0.0014 0.1680 0.0047 0.0248 0.0004 0.0093 0.0032 156 64 158 4 158 2 186 65 11 2717 2085 1.3 0.0496 0.0013 0.1713 0.0045 0.0251 0.0004 0.0078 0.0023 174 60 161 4 160 2 157 46 12 1756 1545 1.1 0.0494 0.0014 0.1742 0.0050 0.0256 0.0004 0.0080 0.0025 168 66 163 4 163 2 162 51 13 1502 1130 1.3 0.0499 0.0015 0.1726 0.0052 0.0251 0.0004 0.0077 0.0023 188 70 162 5 160 2 155 47 14 3708 2048 1.8 0.0497 0.0021 0.1707 0.0070 0.0249 0.0004 0.0078 0.0039 180 95 160 6 159 3 157 79 15 2575 1924 1.3 0.0512 0.0016 0.1799 0.0056 0.0255 0.0004 0.0114 0.0059 248 71 168 5 162 2 229 118 17 2354 1978 1.2 0.0499 0.0016 0.1721 0.0055 0.0250 0.0004 0.0099 0.0053 192 74 161 5 159 2 199 107 18 5470 2521 2.2 0.0501 0.0012 0.1741 0.0042 0.0252 0.0004 0.0080 0.0013 201 56 163 4 160 2 160 27 20 4248 2491 1.7 0.0501 0.0011 0.1740 0.0038 0.0252 0.0004 0.0089 0.0015 198 51 163 3 160 2 180 30 21 2369 1513 1.6 0.0512 0.0011 0.1785 0.0038 0.0253 0.0004 0.0089 0.0015 248 48 167 3 161 2 178 30 22 534 725 0.7 0.0487 0.0020 0.1725 0.0071 0.0257 0.0004 0.0084 0.0014 132 94 162 6 164 3 168 29 23 2953 1737 1.7 0.0507 0.0013 0.1772 0.0044 0.0253 0.0004 0.0087 0.0015 229 56 166 4 161 2 176 29 24 2223 2341 1.0 0.0503 0.0009 0.1777 0.0032 0.0256 0.0004 0.0089 0.0015 207 41 166 3 163 2 180 30 26 1512 1187 1.3 0.0509 0.0027 0.1790 0.0092 0.0255 0.0005 0.0095 0.0016 237 117 167 8 162 3 192 33 27 919 670 1.4 0.0501 0.0031 0.1741 0.0106 0.0252 0.0005 0.0087 0.0015 201 138 163 9 160 3 174 30 28 2931 1592 1.8 0.0521 0.0013 0.1793 0.0043 0.0249 0.0004 0.0087 0.0015 291 54 168 4 159 2 175 29 29 958 1096 0.9 0.0499 0.0014 0.1747 0.0049 0.0254 0.0004 0.0092 0.0016 188 65 163 4 162 2 184 31 30 4156 2260 1.8 0.0492 0.0010 0.1709 0.0035 0.0252 0.0004 0.0086 0.0014 158 48 160 3 160 2 172 29 31 1860 1615 1.2 0.0508 0.0011 0.1751 0.0039 0.0250 0.0004 0.0086 0.0015 232 50 164 3 159 2 173 29 
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表 2 新寮岽铜多金属矿区石英闪长岩主量、微量和稀土元素分析结果及锆石饱和温度
Table 2 Major, trace and rare earth elements data of the quartz-diorite from the Xinliaodong Cu polymetallic ore district and zircon saturation temperatures
样品号 XLD05001 XLD05002 XLD05003 XLD05004 XLD05005 XLD05006 XLD05007 SiO2 57.63 58.07 57.32 57.56 57.57 57.46 58.14 TiO2 0.88 0.95 0.99 0.92 0.98 0.92 0.94 Al2O3 16.30 16.53 15.88 16.21 16.40 16.06 16.23 TFe2O3 7.12 7.67 7.81 7.39 7.48 7.55 7.33 MnO 0.12 0.13 0.18 0.12 0.22 0.15 0.34 MgO 4.56 4.91 4.63 4.58 4.55 4.64 4.53 CaO 6.76 6.68 6.12 6.43 6.17 6.64 6.02 Na2O 2.52 2.61 2.36 2.56 2.56 2.39 2.40 K2O 2.01 1.38 2.69 2.29 1.62 2.35 2.45 P2O5 0.18 0.18 0.18 0.18 0.19 0.18 0.18 烧失量 1.19 1.82 1.23 0.99 1.73 0.89 0.92 总量 99.27 100.93 99.39 99.23 99.47 99.23 99.48 σ 1.40 1.06 1.78 1.62 1.20 1.55 1.55 A/CNK 0.88 0.92 0.89 0.88 0.95 0.87 0.93 A/NK 2.58 2.86 2.34 2.42 2.75 2.48 2.46 DI 45.13 43.39 46.72 45.45 45.28 46.11 47.20 Na 2O+K2O 4.53 3.99 5.05 4.85 4.18 4.74 4.85 K2O/Na2O 0.80 0.53 1.14 0.89 0.63 0.98 1.02 Li 17.49 27.38 20.19 19.87 22.01 17.91 25.99 Be 1.56 1.56 1.57 1.58 1.82 1.56 1.76 Sc 21.05 22.77 21.52 20.91 20.85 20.70 19.78 V 151.0 152.1 147.8 148.8 160.6 148.4 144.3 Cr 150.6 155.1 140.3 135.7 133.7 138.3 127.4 Co 24.06 26.02 22.25 22.70 26.46 23.51 19.62 Ni 45.27 41.05 37.90 36.77 41.77 40.95 33.57 Cu 17.53 21.80 22.81 22.84 40.28 20.89 9.30 Zn 112.0 99.63 164.5 106.7 196.6 125.6 171.3 Ga 20.18 21.06 20.25 20.31 21.70 19.71 19.43 Rb 78.85 56.33 122.6 112.8 63.67 96.68 89.78 Sr 361.6 374.8 349.1 336.0 398.5 300.0 298.9 Y 19.72 20.62 20.29 20.58 21.41 20.98 19.90 Zr 180.2 22.98 53.97 205.4 214.4 162.8 160.7 Nb 9.16 9.42 9.84 9.68 11.20 9.24 9.20 Cd 0.29 0.17 0.53 0.79 1.22 0.51 0.60 In 0.23 0.14 1.27 0.27 0.12 0.11 0.14 Cs 7.25 3.89 5.84 15.13 5.69 11.90 10.63 Ba 457.8 392.8 590.3 416.6 670.0 412.6 502.9 Hf 4.24 0.68 1.57 4.91 5.21 3.92 3.98 Ta 0.64 0.67 0.71 0.71 0.78 0.65 0.67 Pb 12.44 11.31 18.03 52.45 111.1 17.66 114.3 Bi 0.74 0.23 4.66 2.60 1.80 0.30 0.26 Th 8.61 10.31 8.86 9.95 9.76 9.43 9.53 U 2.56 2.78 2.78 3.20 3.00 2.68 3.16 La 23.59 26.73 24.49 26.56 27.15 25.03 21.34 Ce 50.13 54.87 51.94 56.28 56.92 53.19 45.80 Pr 5.89 6.62 6.16 6.59 6.75 6.28 5.49 Nd 23.45 25.93 24.76 25.92 26.82 25.04 22.65 Sm 4.58 5.04 4.90 4.93 5.13 4.84 4.56 Eu 1.16 1.17 1.25 1.14 1.20 1.14 1.14 Gd 4.83 5.25 5.13 5.17 5.42 5.14 4.83 Tb 0.67 0.73 0.72 0.71 0.75 0.72 0.68 Dy 3.78 4.05 3.98 3.99 4.16 4.02 3.83 Ho 0.75 0.79 0.78 0.79 0.82 0.80 0.76 Er 2.15 2.24 2.20 2.26 2.35 2.29 2.17 Tm 0.29 0.30 0.30 0.31 0.32 0.31 0.29 Yb 1.91 1.92 1.91 2.02 2.08 2.03 1.93 Lu 0.28 0.29 0.28 0.30 0.31 0.31 0.29 ΣREE 123.5 135.9 128.8 137.0 140.2 131.1 115.8 LREE 108.8 120.4 113.5 121.4 124.0 115.5 101.0 HREE 14.68 15.57 15.29 15.56 16.21 15.62 14.79 LREE/HREE 7.41 7.73 7.42 7.80 7.65 7.39 6.83 (La/Yb)N 8.84 9.98 9.21 9.43 9.38 8.84 7.93 δEu 0.75 0.69 0.76 0.68 0.69 0.69 0.74 δCe 1.01 0.98 1.01 1.01 1.00 1.01 1.01 T/℃ 748 610 660 759 775 738 747
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表 3 石英闪长岩黑云母电子探针分析结果及相关参数（以11个氧原子为基准）
Table 3 Electron microprobe analyses of biotite from quartze-diorite(based on 11 oxygen atoms)
测点号 XLD XLD XLD XLD XLD 测点号 XLD XLD XLD XLD XLD 05001-4-1 05001-4-2 05007-1-1 05007-1-2 05007-1-3 05001-4-1 05001-4-2 05007-1-1 05007-1-2 05007-1-3 SiO2 38.57 37.48 37.81 38.23 38.52 ArⅣ 1.14 1.15 1.20 1.12 1.12 TiO2 4.08 3.98 5.44 4.62 4.88 AlⅣ 0.10 0.06 0.00 0.04 0.03 Al2O3 14.24 13.49 13.20 13.09 12.96 Ti 0.23 0.23 0.30 0.26 0.27 FeOT 17.28 18.48 11.80 18.51 16.32 Fe3+ 0.20 0.27 0.29 0.20 0.17 MnO 0.17 0.14 0.32 0.53 0.51 Fe2+ 0.91 0.95 0.46 1.01 0.89 MgO 12.90 12.36 16.85 11.64 13.01 Mn 0.01 0.01 0.02 0.03 0.03 CaO 0.02 0.00 0.06 0.05 0.03 Mg 1.43 1.40 1.86 1.31 1.45 Na2O 0.12 0.05 0.09 0.17 0.20 Ca 0.00 0.00 0.00 0.00 0.00 K2O 9.01 8.78 9.06 9.04 8.99 Na 0.02 0.01 0.01 0.02 0.03 Cr2O3 0.22 0.20 0.25 0.24 0.20 K 0.85 0.85 0.86 0.87 0.86 总量 96.61 94.97 94.87 96.11 95.62 Cr 0.01 0.01 0.01 0.01 0.01 Si 2.86 2.85 2.80 2.88 2.88 MF 0.61 0.59 0.79 0.56 0.61 注： TFeO为全铁；FeO3+和Fe2+采用郑巧荣[30]的方法校正；MF=n(Mg)/n(Mg+Fe2++Mn)
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表 4 石英闪长岩中环带结构斜长石电子探针成分分析结果
Table 4 Electron microprobe analyses of zoned plagioclase from quartz-diorite
% 测点 XLD0500 XLD0500 XLD0500 XLD0500 XLD0500 XLD0500 6-2-1-1 6-2-1-2 6-2-1-3 6-2-1-4 6-2-1-5 6-2-1-6 边部→核部 SiO2 51.78 52.35 51.45 51.51 51.27 51.72 TiO2 0.06 0.11 0.10 0.05 0.07 0.02 Al2O3 32.12 31.02 30.31 30.62 30.93 29.83 FeO 0.14 0.30 0.24 0.32 0.36 0.35 MgO 0.03 0.01 0.02 0.00 0.01 0.00 Cr2O3 0.00 0.00 0.04 0.01 0.03 0.02 MnO 0.00 0.00 0.00 0.02 0.00 0.02 CaO 11.45 11.64 11.31 10.94 12.29 12.32 Na2O 4.84 4.81 4.70 5.12 4.32 4.32 K2O 0.22 0.30 0.27 0.35 0.28 0.21 P2O5 0.03 0.02 0.03 0.01 0.00 0.04 总量 100.72 100.59 98.48 98.96 99.57 98.92 Si 2.33 2.37 2.37 2.37 2.35 2.38 Al 1.71 1.65 1.65 1.66 1.67 1.62 Ca 0.55 0.56 0.56 0.54 0.60 0.61 Na 0.42 0.42 0.42 0.46 0.38 0.39 K 0.01 0.02 0.02 0.02 0.02 0.01 Ba 0.00 0.00 0.00 0.00 0.00 0.00 An 55.91 56.21 56.16 53.08 60.12 60.40 Ab 42.80 42.05 42.24 44.92 38.25 38.35 Or 1.29 1.74 1.60 2.00 1.64 1.25 注：数据处理采用Geokit软件计算得出
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表 5 新寮岽铜多金属矿区石英闪长岩的锆石Hf同位素分析结果
Table 5 Lu-Hf isotopic data of zircon from quartz-diorite in the Xinliaodong Cu polymetallic ore district
测点号 t/Ma 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ (176Hf/177Hf)i εHf(0) εHf(t) tDM1/Ma tDM2/Ma fLu/Hf 2 158 0.067067 0.001030 0.282631 0.000014 0.282627 -5.0 -1.6 881 1312 -0.97 6 161 0.075668 0.001280 0.282660 0.000013 0.282656 -4.0 -0.6 845 1245 -0.96 8 160 0.098102 0.001804 0.282678 0.000018 0.282672 -3.3 0.0 831 1210 -0.95 11 160 0.131231 0.002008 0.282756 0.000018 0.282750 -0.6 2.7 722 1033 -0.94 12 163 0.086784 0.001220 0.282664 0.000016 0.282660 -3.8 -0.4 838 1235 -0.96 13 160 0.050521 0.000718 0.282640 0.000017 0.282638 -4.7 -1.2 860 1288 -0.98 15 162 0.137709 0.001854 0.282669 0.000018 0.282664 -3.6 -0.3 844 1228 -0.94 17 159 0.114314 0.001635 0.282722 0.000018 0.282717 -1.8 1.5 764 1110 -0.95 20 160 0.116023 0.002127 0.282689 0.000021 0.282683 -2.9 0.4 822 1186 -0.94 21 161 0.096930 0.001492 0.282681 0.000015 0.282677 -3.2 0.2 819 1199 -0.96 22 164 0.034677 0.000682 0.282509 0.000033 0.282507 -9.3 -5.8 1042 1579 -0.98 23 161 0.125353 0.001983 0.282653 0.000014 0.282647 -4.2 -0.9 871 1266 -0.94 27 160 0.066417 0.001374 0.282672 0.000016 0.282668 -3.5 -0.2 829 1219 -0.96 29 162 0.119899 0.001741 0.282729 0.000016 0.282724 -1.5 1.9 755 1091 -0.95 30 160 0.161227 0.002218 0.282736 0.000019 0.282729 -1.3 2.0 756 1082 -0.93 31 159 0.061143 0.001105 0.282683 0.000015 0.282680 -3.1 0.2 808 1193 -0.97 注：εHf(t)={[(176Hf/177Hf)s-(176Lu/177Hf)s×(eλt-1)]/[(176Hf/177Hf)CHUR, 0-(176Lu/177Hf)CHUR×(et-1)]-1}×10000；TDM1=1/ λ×ln {1+[(176Hf/177Hf)s-(176Hf/177Hf)DM]/[(176Lu/177Hf)s-(176Lu/177Hf)DM]}；TDM2=1/λ×ln{1+[(176Hf/177Hf)s, t-(176Hf/177Hf)DM, t]/[(176Lu/177Hf)C-(176Lu/177Hf)DM]}+t；s=sample, (176Hf/177Hf)CHUR, 0=0.282772, (176Lu/177Hf)CHUR=0.0332, (176Hf/177Hf)DM=0.28325, t为锆石结晶年龄，λ=1.867×10-11a-1, (176Lu/177Hf)C=0.015
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