Zircon U-Pb ages, geochemical characteristics and their constraints on metallogenic mechanism of ore-bearing porphyry in Qingshuihe Donggou molybdenum deposit, East Kunlun
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摘要:
研究目的 清水河东沟斑岩型钼矿是东昆仑成矿带表性斑岩型矿床之一，详细厘定矿区斑岩体形成时代、成因和构造环境有助于提升东昆仑斑岩型钼矿床成矿规律认识。
研究方法 对清水河东沟矿床与成矿关系密切的斑岩体开展了锆石U−Pb定年、岩石地球化学和锆石Hf同位素研究。
研究结果 花岗闪长斑岩锆石U−Pb年龄为226.9±1.3 Ma(MSWD=1.03，n=18)，闪长玢岩锆石U−Pb年龄为224.3±1.2 Ma(MSWD=0.47，n=15)，限定矿床成矿年龄介于226.9~224.3 Ma之间。花岗闪长斑岩、闪长玢岩与花岗斑岩富硅、碱、铝，贫钛、镁，稀土元素含量中等，呈现轻稀土元素富集的右倾配分模式，前两者Eu亏损不明显（δEu=0.79~0.98），后者具有较明显的Eu亏损（δEu=0.22~0.24）；均富集大离子亲石元素Rb、K、Ba等，亏损高场强元素Ta、Nb、Ti、P等，属准铝质—弱过铝质高钾钙碱性岩石系列。斑岩体锆石176Hf/177Hf值介于0.282510~0.282652之间，εHf(t)值介于−4.5~0.2之间，二阶段模式年龄介于1541~1240 Ma之间。
结论 结合区域构造演化特征，认为清水河东沟斑岩体是晚三叠世后碰撞伸展环境下中元古界金水口岩群部分熔融的产物，并受到幔源物质的混染。
Abstract:Objective The Qingshuihe Donggou porphyry molybdenum deposit is one of the representative porphyry deposits in the East Kunlun metallogenic belt.
Methods Therefore, a detailed study of the age, genesis and tectonic environment of the porphyry intrusions in the Qingshuihe Donggou deposit is needed to improve the understanding of the metallogenic regularity of this area. In this paper, zircon U−Pb dating, petrogeochemistry and zircon Hf isotope of the porphyries from the Qingshuihe Donggou deposit, which are closely related to the Mo mineralization, have been studied.
Results The zircon U−Pb age of granodiorite porphyry is 226.9 ± 1.3 Ma (MSWD = 1.03, n = 18), and the zircon U−Pb age of diorite porphyry is 224.3 ± 1.2 Ma (MSWD = 0.47, n = 15), These results indicate that this deposit formed at 226.9~224.3 Ma. Granodiorite porphyry, diorite porphyry and granite porphyry are rich in Si, Na, K and Al, poor in Ti and Mg, and show a right−leaning partition pattern characterized by the light rare earth element enrichment. The former two granites have no obvious Eu depletion (δEu: 0.79~0.98), whereas granite porphyry displays noticeable Eu depletion (δEu: 0.22~0.24). All of them are enriched in large ion lithophile elements (e.g., Rb, K, Ba), and depleted in high field strength elements (e.g., Ta, Nb, Ti, P), belonging to the metalluminous to weak peraluminous high K calc−alkaline granites. The 176Hf/177Hf ratio of zircon from these porphyry rocks ranges from 0.282510 to 0.282652, the εHf(t) value ranges from −4.5 to 0.2, and the two−stage model age ranges from 1541 Ma to 1240 Ma.
Conclusions Based on the characteristics of regional tectonic evolution, it is deduced that these porphyries formed by partial melting of the Middle Proterozoic Jinshuikou Group under the Late Triassic post−collisional extension environment, and experienced magma mixing by mantle−derived materials.
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Key words:
- porphyry molybdenum deposit /
- zircon U−Pb age /
- geochemistry /
- granodiorite porphyry /
- Qingshuihe Donggou /
- East Kunlun
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图 5 清水河东沟斑岩体岩石TAS（a，底图据Middlemost, 1994）、AFM（b，底图据Irvine and Baragar, 1971）、SiO2−K2O（c，底图据Richter, 1989）和A/CNK−A/NK（d，底图据Richter, 1989）图解
Figure 5.
图 6 清水河东沟斑岩体稀土元素球粒陨石标准化配分曲线（a，标准化值据Taylor and McLennan, 1985）和微量元素原始地幔标准化蛛网图（b，标准化数据据Sun and McDonough, 1989）
Figure 6.
图 8 清水河东沟斑岩体Zr+Nb+Ce+Y−(K2O+Na2O)/CaO(a)、Zr+Nb+Ce+Y−TFeO/MgO(b)、QAP(c)和C/MF−A/MF(d)图解（底图据Whalen et al., 1987; Collins et al., 1982）
Figure 8.
图 9 清水河东沟花岗闪长斑岩与闪长玢岩锆石t−εHf（t）图解（a，底图据吴福元等，2007a）与t−176Hf/177Hf图解（b，底图据张勇等，2023）
Figure 9.
图 10 清水河东沟斑岩体YbN−(La/Yb)N（a, 底图据Defant and Drummond, 1990）、Yb−Sr（b, 底图据张旗和焦守涛，2020），（Y+Nb）−Rb（c, 底图据Pearce et al., 1984）和Y−Nb（d, 底图据Pearce et al., 1984）构造环境判别图解
Figure 10.
表 1 清水河东沟矿床样品采集信息
Table 1. Samples collection information in the Qingshuihe Donggou deposit
样品编号 样品类型 重量 孔口坐标 孔深/m 岩性 QSHDZK5-3-N2 锆石U−Pb测年、Hf同位素 31 kg 97°11′43″ E, 36°03′26″ N 562 花岗闪长斑岩 QSHDZK5-3-N2-1~2 全岩分析 ~1 kg 562 花岗闪长斑岩 QSHDZK5-2-N1-1~2 全岩分析 ~1 kg 97°11′42″ E, 36°03′15″ N 375 花岗闪长斑岩 QSHDZK9-3-GS1~2 全岩分析 ~1 kg 97°11′51″ E, 36°03′27″ N 655 花岗斑岩 QSHDZK07-N2 锆石U−Pb测年、Hf同位素 28 kg 97°11′51″ E, 36°03′21″ N 170 闪长玢岩 QSHDZK07-N2-1~3 全岩分析 ~1 kg 709 闪长玢岩 QSHDZK5-3-N3-1~2 全岩分析 ~1 kg 97°11′43″ E, 36°03′26″ N 709 闪长玢岩 
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表 2 清水河东沟斑岩体主量、微量、稀土元素及有关参数
Table 2. Major, trace and rare earth elements and parameter of the porphyry in the Qingshuihe Donggou deposit
元素 ZK5-3-N2-1 ZK5-3-N2-2 ZK5-2-N1-1 ZK5-2-N1-2 ZK9-3-GS1 ZK9-3-GS2 ZK5-3-N3-1 ZK5-3-N3-1 ZK07-N2-1 ZK07-N2-2 ZK07-N2-3 花岗闪长斑岩 花岗斑岩 闪长玢岩 SiO2 69.96 68.32 65.06 64.79 75.54 75.70 59.23 59.17 58.88 59.12 59.41 TiO2 0.38 0.44 0.72 0.73 0.09 0.08 0.83 0.83 0.83 0.84 0.84 Al2O3 14.69 15.32 15.70 15.63 12.36 12.39 16.51 16.52 16.60 16.46 16.58 Fe2O3 0.28 0.40 1.98 2.59 0.54 0.56 2.05 2.70 2.69 2.74 2.40 FeO 2.86 3.21 2.58 2.43 1.08 1.12 4.11 3.50 3.41 3.50 3.60 MnO 0.10 0.11 0.08 0.08 0.10 0.10 0.12 0.13 0.13 0.13 0.12 MgO 0.82 0.99 1.76 1.77 0.15 0.15 3.23 3.59 3.51 3.49 3.50 CaO 2.81 3.09 3.55 3.45 0.72 0.74 5.62 6.14 5.53 5.44 5.45 Na2O 3.06 3.26 3.09 3.23 3.61 3.48 3.42 3.17 3.35 3.36 3.39 K2O 3.89 3.64 3.24 2.64 5.04 4.90 2.47 2.17 2.45 2.56 2.45 P2O5 0.12 0.14 0.19 0.19 0.02 0.01 0.19 0.19 0.19 0.20 0.19 烧失量 0.80 0.98 1.82 2.33 0.49 0.47 1.82 1.47 2.20 2.11 1.84 总计 99.77 99.90 99.77 99.86 99.74 99.70 99.60 99.58 99.77 99.95 99.77 Na2O+K2O 6.95 6.9 6.33 5.87 8.65 8.38 5.89 5.34 5.8 5.92 5.84 K2O/Na2O 1.27 1.12 1.05 0.82 1.40 1.41 0.72 0.68 0.73 0.76 0.72 A/CNK 1.02 1.03 1.04 1.08 0.97 1.00 0.89 0.88 0.91 0.90 0.91 A/NK 1.59 1.65 1.83 1.91 1.08 1.12 1.99 2.18 2.03 1.98 2.01 A/MF 2.26 2.02 1.48 1.39 4.75 4.62 0.99 0.94 0.97 0.95 0.97 C/MF 0.79 0.74 0.61 0.56 0.5 0.5 0.61 0.64 0.59 0.57 0.58 Q 33.59 31.55 30.20 31.10 32.86 34.28 22.90 24.52 23.88 23.74 24.54 A 24.20 20.82 19.33 15.82 39.29 36.79 4.62 2.80 3.73 5.14 2.71 P 42.20 47.63 50.47 53.08 27.85 28.93 72.48 72.68 72.39 71.12 72.75 σ 1.78 1.87 1.78 1.55 2.29 2.14 2.07 1.71 2.04 2.10 2.01 La 30.7 28.6 33.6 33.5 20.45 13.34 24.4 27.5 27.7 23.8 24.1 Ce 54.4 52.7 64.6 65.7 46.36 29.19 54.4 57.7 57.8 54.4 53.8 Pr 6.21 6.05 7.38 7.42 5.79 3.73 6.46 6.81 6.76 6.45 6.34 Nd 21.6 21.6 27.2 26.9 22.1 13.9 25.3 26.3 26.2 24.9 24.9 Sm 3.52 3.63 4.84 4.56 5.05 3.14 5.01 5.08 4.98 4.89 4.91 Eu 1.01 1.00 1.18 1.36 0.37 0.24 1.29 1.30 1.29 1.24 1.25 Gd 2.98 3.18 4.31 3.94 5.02 3.09 4.70 4.84 4.70 4.55 4.63 Tb 0.41 0.44 0.58 0.51 0.78 0.50 0.73 0.71 0.68 0.67 0.68 Dy 1.78 1.92 3.09 2.45 4.65 3.11 3.74 3.72 3.61 3.55 3.60 Ho 0.38 0.42 0.62 0.47 0.96 0.66 0.81 0.79 0.75 0.75 0.77 Er 0.90 0.99 1.65 1.18 2.74 1.93 2.08 2.09 1.98 1.97 2.00 Tm 0.18 0.20 0.27 0.19 0.42 0.30 0.35 0.35 0.32 0.32 0.32 Yb 0.84 0.91 1.59 1.01 2.81 2.01 1.94 1.93 1.82 1.83 1.82 Lu 0.18 0.20 0.26 0.17 0.45 0.31 0.35 0.34 0.31 0.32 0.32 Y 8.52 9.29 15.3 11.7 23.6 17.0 19.7 19.4 19.0 18.7 18.6 ΣREE 125.09 121.84 151.17 149.36 117.95 75.45 131.56 139.46 138.90 129.64 129.44 LREE/HREE 15.35 13.75 11.22 14.06 5.62 5.34 7.95 8.44 8.80 8.29 8.15 (La/Yb)N 26.22 22.54 15.16 23.79 5.22 4.76 9.02 10.22 10.92 9.33 9.50 δEu 0.95 0.90 0.79 0.98 0.22 0.24 0.81 0.80 0.82 0.80 0.80 δCe 0.97 0.98 1.01 1.02 1.04 1.01 1.06 1.03 1.04 1.08 1.07 Rb 136 112 98.6 98.7 189 117 28.8 31.8 68.5 28.6 28.9 Ba 841 740 691 692 181 106 474 589 614 411 401 Th 9.91 9.32 8.09 8.11 44.7 29.1 7.65 8.45 7.98 7.28 7.29 U 2.49 2.42 2.74 2.33 14.2 8.93 1.93 2.10 1.91 1.89 1.82 Ta 0.68 0.67 0.70 0.67 1.62 1.00 0.67 0.65 0.60 0.58 0.57 Nb 9.80 10.3 11.5 10.4 17.0 10.1 10.9 10.7 10.1 10.3 10.4 Sr 432 457 469 475 34.5 18.2 460 455 599 510 532 Zr 207 155 200 184 101 53.7 197 199 189 195 192 Hf 6.28 4.81 5.94 5.57 4.25 2.40 5.84 5.84 5.53 5.69 5.65 Li 21.5 28.3 33.3 34.6 8.60 6.40 30.8 30.9 23.2 22.6 22.8 Be 2.10 2.25 2.60 2.38 3.07 1.84 1.78 1.81 1.76 1.79 1.76 B 11.6 10.9 17.8 11.5 19.9 17.3 14.9 13.6 14.3 14.6 14.4 Sc 3.77 4.23 8.14 7.89 2.93 1.43 11.0 14.0 13.4 10.0 10.0 V 42.4 47.6 106 96.2 2.01 0.47 139 137 132 134 135 Cr 36.2 48.5 45.1 35.1 37.5 70.0 64.9 67.7 64.9 52.8 55.2 Co 11.0 10.6 13.4 10.2 2.61 1.71 17.8 17.8 17.5 17.0 17.5 Ni 12.1 13.3 8.79 9.10 19.1 34.7 19.4 20.5 20.1 19.9 20.5 Cu 585 655 301 252 17.6 5.05 26.6 23.5 23.1 26.2 23.2 Zn 44.2 48.8 62.2 68.5 20.9 14.9 66.5 68.5 69.1 67.8 69.4 Ga 20.1 21.1 23.1 23.2 14.7 8.9 20.3 21.4 20.0 18.3 18.7 Ge 2.96 3.19 3.83 3.64 3.28 1.71 3.77 3.81 3.75 3.55 3.73 As 39.3 39.9 43.4 45.1 1.79 0.65 39.8 43.9 46.8 35.7 36.7 Mo 10.7 19.7 6.74 1.93 4.13 2.33 1.78 1.84 1.88 1.49 1.54 Ag 1.56 1.62 0.57 0.55 0.19 0.10 0.24 0.26 0.26 0.26 0.24 Au 1.18 0.99 0.98 0.99 3.42 2.38 1.13 1.09 1.04 0.96 1.07 Tl 1.36 1.34 1.25 0.98 1.20 0.75 0.44 0.31 0.40 0.35 0.35 Pb 22.7 20.0 20.0 16.2 41.0 27.4 10.9 12.0 14.1 12.6 13.1 注：测试单位为吉林大学自然资源部东北亚矿产资源评价重点实验室；比值单位为1；A/NK=n(Al2O3)/n(Na2O+K2O)(mol)；A/CNK=n(Al2O3)/n(CaO+Na2O+K2O)(mol)；A/MF=nAl2O3/n(TFeO+MgO)(mol)；C/MF=nCaO/n(TFeO+MgO)(mol)；QAP值计算采用花岗岩类自然矿物岩石化学换算法（朱为方和唐春景，1983）；δEu=(2*Eu岩/Eu球)/(Sm岩/Sm球+Gd岩/Gd球) ；δCe=(2*Ce岩/Ce球)/(La岩/La球+Pr岩/Pr球)；主量元素含量单位为%，微量和稀土元素含量单位为10−6
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表 3 清水河东沟斑岩体LA−ICP−MS锆石U−Th−Pb同位素数据
Table 3. LA−ICP−MS U−Th−Pb isotopic analyses of zircon from the porphyry in the Qingshuihe Donggou deposit
测点 含量/10−6 Th/U 同位素比值 表面年龄/Ma U Th Pb 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 花岗闪长斑岩 1 407 237 18.1 0.58 0.05066 0.00130 0.25359 0.00574 0.03634 0.00062 225.4 59.5 229.5 4.6 230.1 3.9 2 328 211 14.7 0.64 0.05081 0.00134 0.25413 0.00687 0.03621 0.00059 232.4 60.9 229.9 5.6 229.3 3.6 3 356 196 16.0 0.55 0.05025 0.00076 0.24841 0.00363 0.03586 0.00042 206.6 35.0 225.3 3.0 227.1 2.6 4 499 275 22.9 0.55 0.05017 0.00071 0.25640 0.00438 0.03693 0.00045 202.8 33.0 231.8 3.5 233.8 2.8 5 377 194 16.7 0.51 0.05056 0.00093 0.25533 0.00453 0.03670 0.00054 220.6 42.7 230.9 3.7 232.3 3.4 6 375 256 17.1 0.68 0.05042 0.00132 0.24683 0.00548 0.03552 0.00046 214.4 60.4 224.0 4.5 225.0 2.8 7 333 209 15.2 0.63 0.05025 0.00078 0.24881 0.00417 0.03585 0.00042 206.8 35.9 225.6 3.4 227.1 2.6 8 585 466 28.6 0.80 0.05080 0.00062 0.25324 0.00325 0.03613 0.00041 231.5 28.2 229.2 2.6 228.8 2.6 9 431 237 19.1 0.55 0.05012 0.00074 0.24975 0.00442 0.03611 0.00051 200.6 34.5 226.4 3.6 228.7 3.2 10 242 107 10.3 0.44 0.05072 0.00082 0.25033 0.00418 0.03577 0.00045 228.2 37.4 226.8 3.4 226.6 2.8 11 348 195 15.2 0.56 0.05076 0.00100 0.25049 0.00482 0.03586 0.00052 230.1 45.4 227.0 3.9 227.1 3.2 12 457 303 19.9 0.66 0.05110 0.00084 0.24898 0.00570 0.03523 0.00046 245.5 38.0 225.8 4.6 223.2 2.9 13 576 484 26.0 0.84 0.05063 0.00078 0.24035 0.00438 0.03435 0.00043 223.8 35.4 218.7 3.6 217.7 2.7 14 427 235 18.6 0.55 0.05038 0.00085 0.25011 0.00515 0.03589 0.00046 212.5 39.2 226.7 4.2 227.3 2.8 15 560 424 25.6 0.76 0.05421 0.00075 0.26143 0.00353 0.03490 0.00037 379.6 31.1 235.8 2.8 221.1 2.3 16 226 97.6 10.0 0.43 0.05066 0.00092 0.26532 0.00557 0.03778 0.00044 225.4 42.1 238.9 4.5 239.0 2.8 17 487 375 22.9 0.77 0.05080 0.00100 0.24750 0.00373 0.03530 0.00034 231.6 45.6 224.5 3.0 223.6 2.1 18 547 436 25.8 0.80 0.05037 0.00064 0.24739 0.00284 0.03550 0.00038 212.3 29.6 224.5 2.3 224.9 2.4 19 156 60.6 6.59 0.39 0.04974 0.00119 0.24761 0.00586 0.03601 0.00044 182.8 55.6 224.6 4.8 228.1 2.8 20 420 324 19.6 0.77 0.05584 0.00118 0.27002 0.00427 0.03504 0.00040 445.8 47.0 242.7 3.4 222.0 2.5 21 427 249 19.0 0.58 0.05423 0.00098 0.26932 0.00420 0.03600 0.00040 380.8 40.4 242.2 3.4 228.0 2.5 22 392 255 17.1 0.65 0.05059 0.00085 0.24812 0.00465 0.03544 0.00044 222.1 39.0 225.0 3.8 224.5 2.7 23 353 261 15.9 0.74 0.05267 0.00097 0.25069 0.00436 0.03443 0.00032 314.7 41.9 227.1 3.5 218.2 2.0 24 325 164 13.9 0.50 0.05455 0.00107 0.26436 0.00520 0.03507 0.00042 393.6 43.8 238.2 4.2 222.2 2.6 25 323 200 14.0 0.62 0.05014 0.00098 0.24572 0.00465 0.03552 0.00037 201.3 45.2 223.1 3.8 225.0 2.3 闪长玢岩 1 424 476 21 1.12 0.05037 0.00068 0.24640 0.00385 0.03544 0.00033 212.1 31.2 223.7 3.1 224.5 2.0 2 276 139 12 0.50 0.05077 0.00104 0.26293 0.00614 0.03749 0.00054 230.5 47.3 237.0 4.9 237.2 3.3 3 406 206 20 0.51 0.05116 0.00079 0.30002 0.00537 0.04244 0.00039 248.1 35.5 266.4 4.2 267.9 2.4 4 383 273 16 0.71 0.05075 0.00082 0.23670 0.00429 0.03380 0.00041 229.4 37.4 215.7 3.5 214.3 2.6 5 282 160 22 0.57 0.05480 0.00070 0.48696 0.00787 0.06436 0.00069 404.2 28.8 402.8 5.4 402.1 4.2 6 458 255 18 0.56 0.05264 0.00122 0.24707 0.00613 0.03402 0.00044 313.4 52.8 224.2 5.0 215.6 2.8 7 352 179 16 0.51 0.05136 0.00067 0.27087 0.00404 0.03826 0.00042 257.1 29.9 243.4 3.2 242.1 2.6 8 556 312 23 0.56 0.05168 0.00099 0.24346 0.00602 0.03405 0.00046 271.4 44.0 221.3 4.9 215.8 2.9 9 289 161 13 0.56 0.05095 0.00077 0.24878 0.00443 0.03543 0.00038 238.4 34.8 225.6 3.6 224.4 2.4 10 537 360 23 0.67 0.05137 0.00091 0.24735 0.00545 0.03492 0.00046 257.6 40.8 224.4 4.4 221.3 2.9 11 296 190 14 0.64 0.05119 0.00088 0.26352 0.00434 0.03729 0.00035 249.6 39.8 237.5 3.5 236.0 2.2 12 255 132 11 0.52 0.05016 0.00157 0.25412 0.00778 0.03679 0.00063 202.5 72.4 229.9 6.3 232.9 3.9 13 284 162 12 0.57 0.05019 0.00072 0.24317 0.00349 0.03513 0.00030 204.0 33.3 221.0 2.8 222.6 1.9 14 279 119 12 0.43 0.05177 0.00120 0.25469 0.00639 0.03559 0.00048 275.2 53.2 230.4 5.2 225.4 3.0 15 536 317 24 0.59 0.05060 0.00070 0.25108 0.00390 0.03591 0.00046 222.6 31.9 227.5 3.2 227.4 2.8 16 446 295 20 0.66 0.04997 0.00062 0.24359 0.00353 0.03530 0.00039 193.8 28.8 221.4 2.9 223.7 2.4 17 161 72 7 0.45 0.05011 0.00170 0.26187 0.00913 0.03768 0.00052 200.0 78.9 236.2 7.3 238.4 3.2 18 1360 554 57 0.41 0.05094 0.00048 0.24970 0.00256 0.03544 0.00033 238.0 21.8 226.3 2.1 224.5 2.1 19 185 117 8 0.63 0.05104 0.00093 0.25120 0.00478 0.03566 0.00039 242.6 42.0 227.6 3.9 225.9 2.4 20 437 265 19 0.61 0.05137 0.00122 0.25489 0.00746 0.03589 0.00045 257.4 54.6 230.5 6.0 227.3 2.8 21 156 126 8 0.81 0.05787 0.00128 0.29700 0.00581 0.03730 0.00033 524.9 48.5 264.1 4.6 236.1 2.1 22 113 73 5 0.65 0.05120 0.00163 0.25134 0.00860 0.03552 0.00043 249.7 73.3 227.7 7.0 225.0 2.7 23 190 166 16 0.87 0.05914 0.00105 0.50276 0.00794 0.06183 0.00076 572.1 38.4 413.6 5.4 386.7 4.6 24 397 247 17 0.62 0.05056 0.00138 0.24875 0.00720 0.03563 0.00054 220.6 63.0 225.6 5.9 225.7 3.3 25 385 74 28 0.19 0.05437 0.00060 0.47886 0.00573 0.06375 0.00061 386.4 24.7 397.3 3.9 398.4 3.7 26 432 255 20 0.59 0.05392 0.00074 0.27897 0.00418 0.03749 0.00041 367.6 30.7 249.8 3.3 237.2 2.6 27 475 499 23 1.05 0.05113 0.00075 0.24841 0.00391 0.03524 0.00035 246.6 33.9 225.3 3.2 223.2 2.2 28 346 325 10 0.94 0.05555 0.00113 0.16338 0.00288 0.02137 0.00024 434.6 45.2 153.7 2.5 136.3 1.5 29 93 105 5 1.13 0.05133 0.00190 0.24818 0.00966 0.03493 0.00043 255.5 85.1 225.1 7.9 221.4 2.7 30 180 120 8 0.67 0.05161 0.00112 0.25196 0.00560 0.03537 0.00042 268.4 49.9 228.2 4.5 224.0 2.6
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表 4 清水河东花岗闪长斑岩与闪长玢岩锆石Hf同位素测试数据
Table 4. Hf isotope analytical data for zircon of the granodiorite porphyry and diorite porphyrite in the Qingshuihe Donggou deposit
样品号 年龄/Ma 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf（t） 2σ TDM1/Ma TDM2/Ma fLu/Hf 花岗闪长斑岩 1 230 0.029781 0.000636 0.001121 0.000027 0.282577 0.000017 −2.0 0.6 958 1389 −0.97 2 229 0.035369 0.002284 0.001233 0.000088 0.282562 0.000019 −2.6 0.7 982 1424 −0.96 3 227 0.028692 0.000588 0.000985 0.000010 0.282580 0.000018 −2.0 0.6 951 1382 −0.97 4 234 0.044705 0.001447 0.001601 0.000024 0.282617 0.000021 −0.6 0.7 914 1301 −0.95 5 232 0.050239 0.000837 0.001715 0.000021 0.282565 0.000019 −2.5 0.7 991 1420 −0.95 6 225 0.022472 0.000441 0.000750 0.000015 0.282557 0.000017 −2.8 0.6 977 1433 −0.98 7 227 0.023007 0.000369 0.000807 0.000008 0.282536 0.000017 −3.5 0.6 1008 1479 −0.98 8 229 0.032114 0.000786 0.001082 0.000030 0.282538 0.000020 −3.4 0.7 1012 1476 −0.97 9 229 0.021759 0.000603 0.000789 0.000008 0.282565 0.000017 −2.4 0.6 967 1413 −0.98 10 227 0.036564 0.001510 0.001179 0.000052 0.282642 0.000019 0.2 0.7 868 1245 −0.96 11 227 0.020522 0.000849 0.000627 0.000016 0.282604 0.000020 −1.0 0.7 908 1325 −0.98 12 223 0.036308 0.000680 0.001241 0.000011 0.282589 0.000018 −1.8 0.6 944 1367 −0.96 14 227 0.024115 0.001047 0.000770 0.000024 0.282582 0.000017 −1.8 0.6 942 1376 −0.98 17 224 0.030954 0.001263 0.000994 0.000023 0.282593 0.000018 −1.6 0.6 933 1355 −0.97 18 225 0.028153 0.000611 0.000974 0.000023 0.282540 0.000019 −3.4 0.7 1007 1473 −0.97 闪长玢岩 1 225 0.045000 0.000704 0.001676 0.000037 0.282612 0.000027 −1.0 1.0 923 1318 −0.95 9 224 0.015400 0.000491 0.000603 0.000015 0.282576 0.000017 −2.1 0.6 947 1390 −0.98 10 221 0.021671 0.000436 0.000736 0.000004 0.282630 0.000019 −0.3 0.7 875 1271 −0.98 13 223 0.021473 0.000425 0.000730 0.000018 0.282558 0.000018 −2.8 0.6 975 1432 −0.98 14 225 0.024962 0.000381 0.001005 0.000020 0.282510 0.000020 −4.5 0.7 1050 1541 −0.97 15 227 0.045307 0.000673 0.001482 0.000044 0.282523 0.000024 −4.0 0.8 1045 1515 −0.96 16 224 0.021242 0.000215 0.000789 0.000017 0.282540 0.000019 −3.4 0.7 1002 1472 −0.98 18 225 0.045031 0.000435 0.001707 0.000020 0.282562 0.000022 −2.7 0.8 995 1431 −0.95 19 226 0.009370 0.000090 0.000336 0.000002 0.282577 0.000021 −2.0 0.7 939 1384 −0.99 20 227 0.028430 0.000576 0.000883 0.000004 0.282593 0.000020 −1.5 0.7 930 1352 −0.97 22 225 0.022263 0.000305 0.000769 0.000006 0.282550 0.000020 −3.0 0.7 987 1449 −0.98 24 226 0.034401 0.000423 0.001111 0.000010 0.282552 0.000019 −3.0 0.7 993 1447 −0.97 27 223 0.097136 0.002597 0.002854 0.000100 0.282652 0.000026 0.2 0.9 894 1240 −0.91 29 221 0.036023 0.000559 0.001034 0.000007 0.282617 0.000025 −0.8 0.9 900 1303 −0.97 30 224 0.024968 0.000337 0.000784 0.000019 0.282597 0.000022 −1.4 0.8 922 1344 −0.98
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