现代地质 ›› 2021, Vol. 35 ›› Issue (02): 535-551.DOI: 10.19657/j.geoscience.1000-8527.2020.105
收稿日期:
2020-09-23
修回日期:
2020-10-15
出版日期:
2021-04-25
发布日期:
2021-05-25
作者简介:
寇冠玉,女,硕士研究生,1995年出生,地质工程专业,主要从事矿床学与矿床地球化学研究。Email: kou_gy@163.com。
基金资助:
KOU Guanyu1(), ZHOU Ye2, ZHENG Yuanchuan1, YU Jiaxing1
Received:
2020-09-23
Revised:
2020-10-15
Online:
2021-04-25
Published:
2021-05-25
摘要:
伊朗马斯杰德达吉(Masjed Daghi)斑岩型矿床位于阿哈尔—乔勒法(Ahar-Julfa)/阿拉斯巴兰(Arasbaran)成矿带的西北部,目前针对该斑岩矿床的研究相对较少,许多地质问题有待解决。为了补充马斯杰德达吉斑岩型矿床成因的地球化学证据,更好地厘定斑岩形成时间,了解矿床形成过程,对矿区中钻孔采集的石英二长斑岩中的长石、石英和锆石等矿物进行了红外-拉曼光谱、同位素及U-Pb定年、主量和微量元素等测试,同时对斑岩全岩主微量元素进行了分析测试。光谱学测试结果显示斑岩样品中的长石斑晶主要为斜长石,少量为钾长石。锆石U-Pb定年结果显示其成岩年龄为(54.1±1.5) Ma (MSWD=0.48),属早始新世,为矿前斑岩。岩体内发育的斜长石具有较低的K2O(0.2%~1.8%)、较高的CaO(1.7%~8.7%)和Na2O(6.5%~9.7%)。这些斑岩中的长石具有相对过量的Al,反映了成岩岩浆具有较高的水含量。锆石Ce4+ / Ce3+比值为152~543,平均330,指示较高的氧逸度。斑岩SiO2含量高达63.4%,含有相对较高的K2O(4.9%)和Sr/Y值(120.0~121.6),显示为具有埃达克特征的钾玄质石英二长斑岩。锆石εHf(t)值为+4.5~+13.5,平均值+10.3,为正异常。另外,二阶段模型年龄(TDM=841~260 Ma)表明岩浆起源于亏损地幔物质。马斯杰德达吉始新世斑岩形成于碰撞前大洋俯冲环境,更可能来自基性岩浆,因经历了俯冲洋壳脱水和地幔楔部分熔融的过程,而具有高氧化和富水的特征。
中图分类号:
寇冠玉, 周晔, 郑远川, 于佳兴. 伊朗马斯杰德达吉(Masjed Daghi)始新世斑岩成因:来自光谱学与U-Pb年代学和地球化学的证据[J]. 现代地质, 2021, 35(02): 535-551.
KOU Guanyu, ZHOU Ye, ZHENG Yuanchuan, YU Jiaxing. Genesis of Eocene Porphyry in Masjed Daghi, Iran: Evidence from Spectrographic, U-Pb Dating and Geochemical Characteristics[J]. Geoscience, 2021, 35(02): 535-551.
矿区 | 成矿带 | 吨位 /Mt | 品味 | 围岩 | 含矿斑岩 | 成矿类型 | 矿产 | 年龄/Ma | 参考 文献 |
---|---|---|---|---|---|---|---|---|---|
马斯杰德达吉 (Masjed Daghi) | 阿哈尔— 乔勒法 (Ahar-Jolfa) 斑岩成矿带 | 340 | 0.27%Cu, 0.006%Mo, 0.32×10-6Au (20 Mt金矿体) | 始新世安山岩、 火山碎屑岩 | 二长闪长岩 | 脉状,散布状 | Cu+Mo+ Au | 20.46± 3.55 | [ |
松贡 (Sungun) | 阿哈尔— 乔勒法斑岩 成矿带 | 850 | 0.62% Cu, 0.01% Mo | 白垩纪沉积物、 始新世火山岩 | 二长岩-石 英二长岩, 花岗闪长岩 | 脉状,散布状, 矽卡岩 | Cu+Mo | 21 | [ |
萨尔切什梅 (Sar Cheshmeh) | 克尔曼 (Kerman) 斑岩成矿带 | 1 200 | 0.6% Cu, 0.02% Mo | 始新世安山岩、 玄武岩、火山 碎屑岩 | 花岗闪长岩 | 脉状,散布状 | Cu+Mo | 7~13 | [ |
梅杜克 (Meiduk) | 克尔曼斑岩 成矿带 | 500 | 0.8% Cu, 0.007% Mo | 始新世安山岩、玄 武岩、火山碎屑岩 | 花岗闪长岩 | 脉状,散布状 | Cu+Mo | 9~12 | [ |
表1 伊朗代表性斑岩型矿床概况及其成矿年龄
Table 1 Characteristics of major Iranian porphyry deposits and their ages
矿区 | 成矿带 | 吨位 /Mt | 品味 | 围岩 | 含矿斑岩 | 成矿类型 | 矿产 | 年龄/Ma | 参考 文献 |
---|---|---|---|---|---|---|---|---|---|
马斯杰德达吉 (Masjed Daghi) | 阿哈尔— 乔勒法 (Ahar-Jolfa) 斑岩成矿带 | 340 | 0.27%Cu, 0.006%Mo, 0.32×10-6Au (20 Mt金矿体) | 始新世安山岩、 火山碎屑岩 | 二长闪长岩 | 脉状,散布状 | Cu+Mo+ Au | 20.46± 3.55 | [ |
松贡 (Sungun) | 阿哈尔— 乔勒法斑岩 成矿带 | 850 | 0.62% Cu, 0.01% Mo | 白垩纪沉积物、 始新世火山岩 | 二长岩-石 英二长岩, 花岗闪长岩 | 脉状,散布状, 矽卡岩 | Cu+Mo | 21 | [ |
萨尔切什梅 (Sar Cheshmeh) | 克尔曼 (Kerman) 斑岩成矿带 | 1 200 | 0.6% Cu, 0.02% Mo | 始新世安山岩、 玄武岩、火山 碎屑岩 | 花岗闪长岩 | 脉状,散布状 | Cu+Mo | 7~13 | [ |
梅杜克 (Meiduk) | 克尔曼斑岩 成矿带 | 500 | 0.8% Cu, 0.007% Mo | 始新世安山岩、玄 武岩、火山碎屑岩 | 花岗闪长岩 | 脉状,散布状 | Cu+Mo | 9~12 | [ |
图3 马斯杰德达吉斑岩样品的岩相学特征(手标本及显微照片) (a)钻孔斑岩样品(MAD-13-483)照片,存在大量明显的长石斑晶,可见石英和黄铁矿;(b)岩石薄片的单偏光显微照片,可见长石和角闪石斑晶;(c)岩石薄片的正交偏光显微照片,可见石英和大量长石斑晶;Kfs. 钾长石; Pl. 斜长石; Py. 黄铁矿; Qtz. 石英; Am. 角闪石
Fig.3 Petrographic characteristics of the Masjed Daghi porphyry sample(hand specimen and thin-section micrographs)
编号 | 含量/10-6 | 同位素比值 | 年龄/Ma | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Th | U | Pb | 207Pb/206Pb (1σ) | 207Pb/235U (1σ) | 206Pb/238U (1σ) | 207Pb/206Pb (1σ) | 207Pb/235U (1σ) | 206Pb/238U (1σ) | |||
1 | 75.40 | 153.40 | 1.91 | 0.194 8(0.030 5) | 0.207 8(0.029 0) | 0.008 7(0.000 5) | 2 783.65(259.26) | 191.70(24.37) | 56.16(3.37) | ||
2 | 68.81 | 171.28 | 1.98 | 0.187 4(0.049 7) | 0.184 5(0.039 0) | 0.008 1(0.000 3) | 2 720.38(451.70) | 171.89(33.43) | 52.30(1.92) | ||
3 | 69.74 | 135.25 | 1.76 | 0.293 1(0.064 7) | 0.327 9(0.071 2) | 0.008 6(0.000 4) | 3 434.27(349.00) | 287.94(54.50) | 55.33(2.25) | ||
4 | 76.72 | 249.94 | 3.35 | 0.235 8(0.071 6) | 0.344 1(0.124 7) | 0.009 8(0.001 0) | 3 091.67(504.76) | 300.31(94.44) | 63.14(6.53) | ||
5 | 146.88 | 348.51 | 3.77 | 0.069 5(0.005 5) | 0.079 8(0.006 4) | 0.008 7(0.000 3) | 922.22(195.37) | 78.00(6.01) | 55.90(1.78) | ||
6 | 94.40 | 172.80 | 2.76 | 0.240 8(0.036 7) | 0.292 2(0.034 0) | 0.010 0(0.000 7) | 3 125.01(245.07) | 260.33(26.74) | 63.85(4.29) | ||
7 | 140.27 | 215.30 | 2.34 | 0.179 8(0.048 1) | 0.196 7(0.066 2) | 0.007 8(0.000 3) | 2 650.31(458.34) | 182.37(56.21) | 50.23(2.09) | ||
8 | 96.24 | 170.61 | 1.83 | 0.010 8(0.015 2) | 0.012 2(0.015 9) | 0.008 4(0.000 3) | - | 12.33(15.91) | 53.91(1.93) | ||
9 | 293.68 | 538.35 | 5.80 | 0.059 9(0.010 4) | 0.068 9(0.011 9) | 0.008 2(0.000 3) | 611.13(381.44) | 67.69(11.33) | 52.87(2.08) | ||
10 | 121.63 | 318.14 | 5.06 | 0.206 5(0.071 8) | 0.250 4(0.077 3) | 0.009 4(0.000 4) | 2 878.7(596.43) | 226.92(62.83) | 60.06(2.43) | ||
11 | 146.05 | 368.76 | 3.64 | 0.148 1(0.060 6) | 0.140 4(0.049 9) | 0.007 9(0.000 2) | 2 324.39(761.88) | 133.44(44.44) | 50.92(1.55) | ||
12 | 119.76 | 263.15 | 2.83 | 0.080 8(0.006 3) | 0.097 0(0.009 0) | 0.008 4(0.000 3) | 1 216.67(155.09) | 93.96(8.37) | 54.09(2.05) | ||
13 | 79.83 | 163.51 | 1.70 | 0.246 7(0.041 0) | 0.242 9(0.035 5) | 0.008 3(0.000 3) | 3 164.82(266.67) | 220.76(28.99) | 53.01(2.12) | ||
14 | 113.20 | 331.29 | 3.34 | 0.095 5(0.012 7) | 0.103 4(0.011 1) | 0.008 8(0.000 5) | 1 536.73(251.85) | 99.89(10.23) | 56.37(3.35) | ||
15 | 133.43 | 282.62 | 3.01 | 0.100 5(0.016 6) | 0.106 5(0.015 0) | 0.008 5(0.000 4) | 1 633.02(311.11) | 102.80(13.81) | 54.35(2.27) |
表2 马斯杰德达吉斑岩(MAD-13-483)锆石LA-ICP-MS U-Pb年龄分析结果
Table 2 LA-ICP-MS zircon U-Pb data of the Masjed Daghi porphyry sample (MAD-13-483)
编号 | 含量/10-6 | 同位素比值 | 年龄/Ma | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Th | U | Pb | 207Pb/206Pb (1σ) | 207Pb/235U (1σ) | 206Pb/238U (1σ) | 207Pb/206Pb (1σ) | 207Pb/235U (1σ) | 206Pb/238U (1σ) | |||
1 | 75.40 | 153.40 | 1.91 | 0.194 8(0.030 5) | 0.207 8(0.029 0) | 0.008 7(0.000 5) | 2 783.65(259.26) | 191.70(24.37) | 56.16(3.37) | ||
2 | 68.81 | 171.28 | 1.98 | 0.187 4(0.049 7) | 0.184 5(0.039 0) | 0.008 1(0.000 3) | 2 720.38(451.70) | 171.89(33.43) | 52.30(1.92) | ||
3 | 69.74 | 135.25 | 1.76 | 0.293 1(0.064 7) | 0.327 9(0.071 2) | 0.008 6(0.000 4) | 3 434.27(349.00) | 287.94(54.50) | 55.33(2.25) | ||
4 | 76.72 | 249.94 | 3.35 | 0.235 8(0.071 6) | 0.344 1(0.124 7) | 0.009 8(0.001 0) | 3 091.67(504.76) | 300.31(94.44) | 63.14(6.53) | ||
5 | 146.88 | 348.51 | 3.77 | 0.069 5(0.005 5) | 0.079 8(0.006 4) | 0.008 7(0.000 3) | 922.22(195.37) | 78.00(6.01) | 55.90(1.78) | ||
6 | 94.40 | 172.80 | 2.76 | 0.240 8(0.036 7) | 0.292 2(0.034 0) | 0.010 0(0.000 7) | 3 125.01(245.07) | 260.33(26.74) | 63.85(4.29) | ||
7 | 140.27 | 215.30 | 2.34 | 0.179 8(0.048 1) | 0.196 7(0.066 2) | 0.007 8(0.000 3) | 2 650.31(458.34) | 182.37(56.21) | 50.23(2.09) | ||
8 | 96.24 | 170.61 | 1.83 | 0.010 8(0.015 2) | 0.012 2(0.015 9) | 0.008 4(0.000 3) | - | 12.33(15.91) | 53.91(1.93) | ||
9 | 293.68 | 538.35 | 5.80 | 0.059 9(0.010 4) | 0.068 9(0.011 9) | 0.008 2(0.000 3) | 611.13(381.44) | 67.69(11.33) | 52.87(2.08) | ||
10 | 121.63 | 318.14 | 5.06 | 0.206 5(0.071 8) | 0.250 4(0.077 3) | 0.009 4(0.000 4) | 2 878.7(596.43) | 226.92(62.83) | 60.06(2.43) | ||
11 | 146.05 | 368.76 | 3.64 | 0.148 1(0.060 6) | 0.140 4(0.049 9) | 0.007 9(0.000 2) | 2 324.39(761.88) | 133.44(44.44) | 50.92(1.55) | ||
12 | 119.76 | 263.15 | 2.83 | 0.080 8(0.006 3) | 0.097 0(0.009 0) | 0.008 4(0.000 3) | 1 216.67(155.09) | 93.96(8.37) | 54.09(2.05) | ||
13 | 79.83 | 163.51 | 1.70 | 0.246 7(0.041 0) | 0.242 9(0.035 5) | 0.008 3(0.000 3) | 3 164.82(266.67) | 220.76(28.99) | 53.01(2.12) | ||
14 | 113.20 | 331.29 | 3.34 | 0.095 5(0.012 7) | 0.103 4(0.011 1) | 0.008 8(0.000 5) | 1 536.73(251.85) | 99.89(10.23) | 56.37(3.35) | ||
15 | 133.43 | 282.62 | 3.01 | 0.100 5(0.016 6) | 0.106 5(0.015 0) | 0.008 5(0.000 4) | 1 633.02(311.11) | 102.80(13.81) | 54.35(2.27) |
图7 马斯杰德达吉斑岩(MAD-13-483)锆石U-Pb谐和年龄(a)和加权平均年龄(b)
Fig.7 Zircon U-Pb concordia plot (a) and weighted-mean age plot(b) of the Masjed Daghi porphyry sample (MAD-13-483)
点号 | SiO2 | TiO2 | Al2O3 | FeO | MnO | MgO | CaO | Na2O | K2O | F | Cl | Cr2O3 | P2O5 | Al/(Ca+ Na+K) | K2O+ Na2O+CaO | An | Ab | Or |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
pl-1 | 60.13 | 0.020 | 24.47 | 0.168 | 0.019 | - | 5.926 | 8.322 | 0.264 | 0.092 | - | - | 0.007 | 1.26 | 14.512 | 27.82 | 70.70 | 1.47 |
pl-2 | 59.39 | - | 25.75 | 0.203 | 0.027 | 0.008 | 7.112 | 7.598 | 0.189 | 0.050 | - | - | 0.011 | 1.34 | 14.899 | 33.72 | 65.20 | 1.06 |
pl-3 | 59.86 | 0.025 | 24.82 | 0.336 | 0.034 | - | 6.706 | 7.961 | 0.253 | - | - | 0.005 | 0.022 | 1.27 | 14.920 | 31.31 | 67.27 | 1.40 |
pl-4 | 60.12 | 0.048 | 24.82 | 0.149 | 0.034 | - | 6.491 | 8.185 | 0.277 | 0.078 | 0.001 | - | 0.019 | 1.26 | 14.953 | 30.00 | 68.46 | 1.52 |
pl-5 | 60.03 | - | 24.49 | 0.133 | - | 0.024 | 6.349 | 7.803 | 0.270 | - | 0.006 | - | - | 1.29 | 14.422 | 30.53 | 67.91 | 1.54 |
pl2-1 | 58.20 | - | 25.78 | 0.140 | - | - | 7.565 | 7.453 | 0.186 | - | 0.002 | - | 0.011 | 1.33 | 15.204 | 35.56 | 63.39 | 1.04 |
pl2-2 | 58.65 | 0.048 | 25.21 | 0.155 | 0.050 | - | 7.047 | 7.563 | 0.224 | 0.050 | 0.003 | - | 0.022 | 1.32 | 14.834 | 33.55 | 65.17 | 1.26 |
pl2-3 | 57.07 | 0.002 | 26.57 | 0.102 | 0.053 | 0.006 | 8.688 | 6.746 | 0.186 | - | - | - | - | 1.38 | 15.620 | 41.14 | 57.80 | 1.04 |
pl2-4 | 58.74 | 0.041 | 25.95 | 0.193 | - | 0.006 | 7.778 | 7.369 | 0.172 | 0.100 | - | 0.037 | - | 1.33 | 15.319 | 36.48 | 62.55 | 0.96 |
pl2-5 | 63.46 | - | 22.51 | 0.073 | - | - | 3.711 | 9.676 | 0.335 | - | - | - | 0.019 | 1.14 | 13.722 | 17.16 | 80.99 | 1.84 |
pl3-1 | 56.98 | - | 26.76 | 0.235 | 0.011 | - | 8.552 | 6.855 | 0.178 | - | 0.006 | - | - | 1.39 | 15.585 | 40.39 | 58.59 | 1.00 |
pl3-2 | 55.45 | 0.016 | 25.47 | 0.082 | 0.034 | 0.041 | 7.649 | 7.179 | 0.184 | 0.036 | 0.011 | - | 0.019 | 1.34 | 15.012 | 36.66 | 62.28 | 1.05 |
pl3-3 | 55.74 | 0.005 | 26.26 | 0.133 | 0.023 | 0.243 | 7.638 | 6.516 | 0.729 | - | 0.007 | - | 0.015 | 1.42 | 14.883 | 37.63 | 58.09 | 4.27 |
pl3-4 | 57.19 | 0.014 | 25.88 | 0.101 | 0.019 | 0.103 | 7.080 | 6.841 | 0.482 | - | 0.008 | - | - | 1.42 | 14.403 | 35.34 | 61.79 | 2.86 |
pl3-5 | 64.91 | - | 22.01 | 0.086 | 0.030 | 0.061 | 1.655 | 9.476 | 1.787 | 0.035 | - | 0.057 | - | 1.15 | 12.918 | 7.90 | 81.92 | 10.16 |
表3 马斯杰德达吉斑岩(MAD-13-483)长石的主量元素(%)分析结果
Table 3 Representative EPMA major element compositions (%) of feldspars from the Masjed Daghi porphyry sample (MAD-13-483)
点号 | SiO2 | TiO2 | Al2O3 | FeO | MnO | MgO | CaO | Na2O | K2O | F | Cl | Cr2O3 | P2O5 | Al/(Ca+ Na+K) | K2O+ Na2O+CaO | An | Ab | Or |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
pl-1 | 60.13 | 0.020 | 24.47 | 0.168 | 0.019 | - | 5.926 | 8.322 | 0.264 | 0.092 | - | - | 0.007 | 1.26 | 14.512 | 27.82 | 70.70 | 1.47 |
pl-2 | 59.39 | - | 25.75 | 0.203 | 0.027 | 0.008 | 7.112 | 7.598 | 0.189 | 0.050 | - | - | 0.011 | 1.34 | 14.899 | 33.72 | 65.20 | 1.06 |
pl-3 | 59.86 | 0.025 | 24.82 | 0.336 | 0.034 | - | 6.706 | 7.961 | 0.253 | - | - | 0.005 | 0.022 | 1.27 | 14.920 | 31.31 | 67.27 | 1.40 |
pl-4 | 60.12 | 0.048 | 24.82 | 0.149 | 0.034 | - | 6.491 | 8.185 | 0.277 | 0.078 | 0.001 | - | 0.019 | 1.26 | 14.953 | 30.00 | 68.46 | 1.52 |
pl-5 | 60.03 | - | 24.49 | 0.133 | - | 0.024 | 6.349 | 7.803 | 0.270 | - | 0.006 | - | - | 1.29 | 14.422 | 30.53 | 67.91 | 1.54 |
pl2-1 | 58.20 | - | 25.78 | 0.140 | - | - | 7.565 | 7.453 | 0.186 | - | 0.002 | - | 0.011 | 1.33 | 15.204 | 35.56 | 63.39 | 1.04 |
pl2-2 | 58.65 | 0.048 | 25.21 | 0.155 | 0.050 | - | 7.047 | 7.563 | 0.224 | 0.050 | 0.003 | - | 0.022 | 1.32 | 14.834 | 33.55 | 65.17 | 1.26 |
pl2-3 | 57.07 | 0.002 | 26.57 | 0.102 | 0.053 | 0.006 | 8.688 | 6.746 | 0.186 | - | - | - | - | 1.38 | 15.620 | 41.14 | 57.80 | 1.04 |
pl2-4 | 58.74 | 0.041 | 25.95 | 0.193 | - | 0.006 | 7.778 | 7.369 | 0.172 | 0.100 | - | 0.037 | - | 1.33 | 15.319 | 36.48 | 62.55 | 0.96 |
pl2-5 | 63.46 | - | 22.51 | 0.073 | - | - | 3.711 | 9.676 | 0.335 | - | - | - | 0.019 | 1.14 | 13.722 | 17.16 | 80.99 | 1.84 |
pl3-1 | 56.98 | - | 26.76 | 0.235 | 0.011 | - | 8.552 | 6.855 | 0.178 | - | 0.006 | - | - | 1.39 | 15.585 | 40.39 | 58.59 | 1.00 |
pl3-2 | 55.45 | 0.016 | 25.47 | 0.082 | 0.034 | 0.041 | 7.649 | 7.179 | 0.184 | 0.036 | 0.011 | - | 0.019 | 1.34 | 15.012 | 36.66 | 62.28 | 1.05 |
pl3-3 | 55.74 | 0.005 | 26.26 | 0.133 | 0.023 | 0.243 | 7.638 | 6.516 | 0.729 | - | 0.007 | - | 0.015 | 1.42 | 14.883 | 37.63 | 58.09 | 4.27 |
pl3-4 | 57.19 | 0.014 | 25.88 | 0.101 | 0.019 | 0.103 | 7.080 | 6.841 | 0.482 | - | 0.008 | - | - | 1.42 | 14.403 | 35.34 | 61.79 | 2.86 |
pl3-5 | 64.91 | - | 22.01 | 0.086 | 0.030 | 0.061 | 1.655 | 9.476 | 1.787 | 0.035 | - | 0.057 | - | 1.15 | 12.918 | 7.90 | 81.92 | 10.16 |
图8 马斯杰德达吉斑岩(MAD-13-483)长石分类(单位为%,据Deer等[43]修改)
Fig.8 Classification of feldspars from the Masjed Daghi porphyry sample (MAD-13-483)(modified after Deer et al.[43])
图9 长石SiO2-(CaO+Na2O+K2O)图(a)和An-Al/(Ca+Na+K) 图(b)(据Zarasvandi等[44]修改)
Fig.9 SiO2 vs.(CaO+Na2O+K2O) (a), and An vs. Al / (Ca+Na+K) (b) diagrams of feldspars from the Masjed Daghi porphyry sample (MAD-13-483) (modified after Zarasvandi et al.[44])
编号 | SiO2 | Na2O | K2O | Cr2O3 | Al2O3 | MgO | CaO | MnO | P2O5 | FeO | TiO2 | NiO | 总量 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 98.284 | 0.014 | 0.014 | - | - | 0.002 | 0.008 | 0.036 | - | 0.004 | 0.009 | 0.027 | 98.398 |
2 | 99.230 | 0.026 | 0.004 | 0.018 | 0.021 | - | 0.008 | - | - | - | - | 0.035 | 99.342 |
3 | 98.447 | 0.029 | 0.018 | 0.023 | 0.009 | - | 0.010 | - | - | 0.046 | - | - | 98.582 |
4 | 98.328 | 0.066 | 0.016 | 0.551 | 0.036 | 0.018 | 0.025 | 0.031 | - | - | - | - | 99.071 |
5 | 99.503 | 0.021 | 0.009 | - | 0.030 | - | 0.023 | - | - | - | 0.005 | 0.069 | 99.660 |
6 | 99.292 | 0.008 | - | 0.005 | 0.02 | - | 0.013 | - | 0.019 | - | 0.007 | - | 99.364 |
7 | 98.809 | - | - | 0.005 | 0.021 | - | - | - | 0.010 | 0.031 | 0.020 | 0.017 | 98.913 |
8 | 99.059 | 0.015 | 0.007 | - | 0.054 | 0.011 | - | - | - | - | 0.060 | 0.007 | 99.213 |
9 | 98.805 | 0.005 | - | - | - | - | 0.017 | 0.014 | 0.001 | 0.023 | 0.017 | 0.017 | 98.899 |
10 | 98.965 | 0.003 | - | 0.041 | 0.071 | - | 0.010 | - | 0.033 | - | 0.061 | - | 99.184 |
表4 马斯杰德达吉斑岩(MAD-13-483)石英的主量(%)元素分析结果
Table 4 Representative EPMA major element compositions (%) of quartz from the Masjed Daghi porphyry sample (MAD-13-483)
编号 | SiO2 | Na2O | K2O | Cr2O3 | Al2O3 | MgO | CaO | MnO | P2O5 | FeO | TiO2 | NiO | 总量 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 98.284 | 0.014 | 0.014 | - | - | 0.002 | 0.008 | 0.036 | - | 0.004 | 0.009 | 0.027 | 98.398 |
2 | 99.230 | 0.026 | 0.004 | 0.018 | 0.021 | - | 0.008 | - | - | - | - | 0.035 | 99.342 |
3 | 98.447 | 0.029 | 0.018 | 0.023 | 0.009 | - | 0.010 | - | - | 0.046 | - | - | 98.582 |
4 | 98.328 | 0.066 | 0.016 | 0.551 | 0.036 | 0.018 | 0.025 | 0.031 | - | - | - | - | 99.071 |
5 | 99.503 | 0.021 | 0.009 | - | 0.030 | - | 0.023 | - | - | - | 0.005 | 0.069 | 99.660 |
6 | 99.292 | 0.008 | - | 0.005 | 0.02 | - | 0.013 | - | 0.019 | - | 0.007 | - | 99.364 |
7 | 98.809 | - | - | 0.005 | 0.021 | - | - | - | 0.010 | 0.031 | 0.020 | 0.017 | 98.913 |
8 | 99.059 | 0.015 | 0.007 | - | 0.054 | 0.011 | - | - | - | - | 0.060 | 0.007 | 99.213 |
9 | 98.805 | 0.005 | - | - | - | - | 0.017 | 0.014 | 0.001 | 0.023 | 0.017 | 0.017 | 98.899 |
10 | 98.965 | 0.003 | - | 0.041 | 0.071 | - | 0.010 | - | 0.033 | - | 0.061 | - | 99.184 |
编号 | ZrO2 | Ce | Lu | Hf | Ce4+/Ce3+ |
---|---|---|---|---|---|
1 | 94.81 | 8.11 | 46.06 | 9 356.71 | 217.45 |
2 | 91.12 | 7.79 | 39.15 | 8 914.20 | 197.24 |
3 | 91.85 | 8.05 | 43.98 | 8 085.89 | 152.12 |
4 | 89.97 | 15.67 | 57.84 | 9 701.81 | 543.19 |
5 | 91.74 | 16.01 | 36.09 | 9 968.56 | 433.31 |
6 | 93.38 | 10.37 | 47.34 | 9 335.95 | 471.77 |
7 | 90.77 | 11.96 | 41.65 | 8 920.27 | 247.08 |
8 | 90.30 | 14.09 | 33.20 | 8 615.26 | 496.12 |
9 | 94.94 | 31.78 | 103.09 | 10 190.34 | 252.40 |
10 | 91.64 | 14.42 | 60.42 | 9 956.50 | 205.69 |
11 | 90.89 | 15.00 | 49.37 | 9 846.30 | 481.46 |
12 | 91.52 | 12.52 | 44.18 | 10 053.70 | 324.96 |
13 | 89.70 | 10.29 | 37.67 | 9 252.59 | 259.83 |
14 | 88.98 | 13.53 | 71.74 | 9 965.00 | 469.19 |
15 | 94.64 | 15.40 | 58.59 | 9 799.83 | 204.75 |
表5 马斯杰德达吉斑岩(MAD-13-483)锆石主量(%)和微量(10-6)元素分析结果
Table 5 Representative zircon major (%) and trace element (10-6) compositions of the Masjed Daghi porphyry sample (MAD-13-483)
编号 | ZrO2 | Ce | Lu | Hf | Ce4+/Ce3+ |
---|---|---|---|---|---|
1 | 94.81 | 8.11 | 46.06 | 9 356.71 | 217.45 |
2 | 91.12 | 7.79 | 39.15 | 8 914.20 | 197.24 |
3 | 91.85 | 8.05 | 43.98 | 8 085.89 | 152.12 |
4 | 89.97 | 15.67 | 57.84 | 9 701.81 | 543.19 |
5 | 91.74 | 16.01 | 36.09 | 9 968.56 | 433.31 |
6 | 93.38 | 10.37 | 47.34 | 9 335.95 | 471.77 |
7 | 90.77 | 11.96 | 41.65 | 8 920.27 | 247.08 |
8 | 90.30 | 14.09 | 33.20 | 8 615.26 | 496.12 |
9 | 94.94 | 31.78 | 103.09 | 10 190.34 | 252.40 |
10 | 91.64 | 14.42 | 60.42 | 9 956.50 | 205.69 |
11 | 90.89 | 15.00 | 49.37 | 9 846.30 | 481.46 |
12 | 91.52 | 12.52 | 44.18 | 10 053.70 | 324.96 |
13 | 89.70 | 10.29 | 37.67 | 9 252.59 | 259.83 |
14 | 88.98 | 13.53 | 71.74 | 9 965.00 | 469.19 |
15 | 94.64 | 15.40 | 58.59 | 9 799.83 | 204.75 |
SiO2 | TiO2 | Al2O3 | Fe2O3 | MnO | MgO | CaO | Na2O | K2O |
---|---|---|---|---|---|---|---|---|
63.44 | 0.37 | 14.39 | 1.73 | 0.02 | 2.18 | 3.43 | 3.81 | 4.85 |
P2O5 | LOI | SUM | Na+K | Li | Be | Sc | V | Cr |
0.07 | 4.49 | 98.78 | 8.66 | 11.09 | 0.85 | 7.95 | 84.74 | 15.88 |
Co | Ni | Cu | Zn | Ga | Rb | Sr | Y | Zr |
4.91 | 9.97 | 1 957.96 | 61.28 | 14.64 | 111.64 | 702.24 | 5.81 | 106.83 |
Nb | Sn | Cs | Ba | La | Ce | Pr | Nd | Sm |
8.06 | 0.85 | 1.78 | 1 177.61 | 25.54 | 40.11 | 3.88 | 12.71 | 1.99 |
Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu |
0.66 | 1.37 | 0.18 | 1.05 | 0.19 | 0.59 | 0.09 | 0.58 | 0.09 |
Hf | Ta | Pb | Th | U | Sr/Y | |||
2.67 | 0.46 | 32.99 | 9.78 | 1.83 | 120.78 |
表6 马斯杰德达吉斑岩(MAD-13-483)全岩主量(%)和微量(10-6)元素分析结果
Table 6 Whole-rock major (%) and trace element (10-6) compositions of the porphyry sample(MAD-13-483)
SiO2 | TiO2 | Al2O3 | Fe2O3 | MnO | MgO | CaO | Na2O | K2O |
---|---|---|---|---|---|---|---|---|
63.44 | 0.37 | 14.39 | 1.73 | 0.02 | 2.18 | 3.43 | 3.81 | 4.85 |
P2O5 | LOI | SUM | Na+K | Li | Be | Sc | V | Cr |
0.07 | 4.49 | 98.78 | 8.66 | 11.09 | 0.85 | 7.95 | 84.74 | 15.88 |
Co | Ni | Cu | Zn | Ga | Rb | Sr | Y | Zr |
4.91 | 9.97 | 1 957.96 | 61.28 | 14.64 | 111.64 | 702.24 | 5.81 | 106.83 |
Nb | Sn | Cs | Ba | La | Ce | Pr | Nd | Sm |
8.06 | 0.85 | 1.78 | 1 177.61 | 25.54 | 40.11 | 3.88 | 12.71 | 1.99 |
Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu |
0.66 | 1.37 | 0.18 | 1.05 | 0.19 | 0.59 | 0.09 | 0.58 | 0.09 |
Hf | Ta | Pb | Th | U | Sr/Y | |||
2.67 | 0.46 | 32.99 | 9.78 | 1.83 | 120.78 |
图10 马斯杰德达吉斑岩(MAD-13-483)TAS分类图解(a)、SiO2-K2O关系图(b)和Y-Sr/Y关系图(c)((a)据Middlemost[46]修改,(b)据Peccerillo和Taylor[47]修改,(c)据Defant等[48]修改)
Fig.10 TAS (a), SiO2 vs. K2O (b), and Y vs. Sr/Y(c)classification diagrams of the porphyry sample (MAO-13-483)((a)modified after Middle-most[46], (b) modified after Peccerillo and Taylor [47],(c) modified after Defant et al.[48])
图11 马斯杰德达吉斑岩(MAD-13-483)锆石t-εHf(t)图(a)和εHf(t)频率图(b)
Fig.11 Zircon U-Pb age vs. εHf(t) isotope data of the Masjed Daghi porphyry(MAD-13-483)(a) and εHf(t) histogram (b)
编号 | 年龄/Ma | 176Hf/177Hf(2σ) | 176Lu/177Hf(2σ) | εHf (t) | TDM /Ma | |
---|---|---|---|---|---|---|
1 | 56.16 | 0.283 02(0.000 02) | 0.000 82(0.000 02) | 9.95 | 327.79 | 492.38 |
2 | 52.30 | 0.283 05(0.000 04) | 0.000 86(0.000 01) | 10.90 | 286.45 | 427.92 |
3 | 55.33 | 0.283 03(0.000 03) | 0.000 67(0.000 04) | 10.39 | 308.30 | 463.22 |
4 | 63.14 | 0.283 02(0.000 02) | 0.001 15(0.000 02) | 10.16 | 327.80 | 484.47 |
5 | 55.90 | 0.282 99(0.000 02) | 0.000 98(0.000 01) | 8.87 | 372.20 | 561.78 |
6 | 63.85 | 0.283 02(0.000 02) | 0.000 86(0.000 01) | 10.31 | 320.33 | 475.28 |
7 | 50.23 | 0.283 07(0.000 02) | 0.000 76(0.000 01) | 11.72 | 251.33 | 373.71 |
8 | 53.91 | 0.283 02(0.000 02) | 0.000 79(0.000 03) | 9.80 | 331.75 | 500.52 |
9 | 52.87 | 0.282 87(0.000 07) | 0.001 53(0.000 02) | 4.47 | 553.33 | 841.47 |
10 | 60.06 | 0.282 98(0.000 07) | 0.000 84(0.000 01) | 8.52 | 388.31 | 586.92 |
11 | 50.92 | 0.283 12(0.000 02) | 0.000 94(0.000 01) | 13.50 | 181.36 | 259.74 |
12 | 54.09 | 0.283 03(0.000 02) | 0.001 06(0.000 02) | 10.44 | 308.08 | 459.43 |
13 | 53.01 | 0.283 03(0.000 02) | 0.000 94(0.000 01) | 10.42 | 307.13 | 459.82 |
14 | 56.37 | 0.283 03(0.000 02) | 0.000 90(0.000 01) | 10.41 | 310.16 | 463.05 |
15 | 54.35 | 0.283 04(0.000 03) | 0.000 83(0.000 01) | 10.61 | 299.63 | 448.19 |
16 | 54.00 | 0.283 05(0.000 03) | 0.000 62(0.000 04) | 11.13 | 277.45 | 414.72 |
17 | 54.00 | 0.282 99(0.000 03) | 0.000 90(0.000 03) | 8.70 | 376.72 | 571.12 |
18 | 54.00 | 0.283 04(0.000 03) | 0.001 23(0.000 02) | 10.49 | 307.20 | 456.16 |
19 | 54.00 | 0.283 04(0.000 03) | 0.000 56(0.000 01) | 10.53 | 300.85 | 453.21 |
20 | 54.00 | 0.283 06(0.000 03) | 0.000 65(0.000 01) | 11.29 | 271.31 | 404.56 |
21 | 54.00 | 0.283 07(0.000 03) | 0.000 84(0.000 01) | 11.56 | 261.58 | 387.17 |
22 | 54.00 | 0.283 06(0.000 02) | 0.000 91(0.000 02) | 11.43 | 266.99 | 395.22 |
23 | 54.00 | 0.283 06(0.000 02) | 0.000 98(0.000 01) | 11.29 | 272.91 | 404.11 |
24 | 54.00 | 0.283 01(0.000 02) | 0.001 38(0.000 01) | 9.69 | 340.61 | 507.45 |
25 | 54.00 | 0.283 03(0.000 02) | 0.001 07(0.000 01) | 10.21 | 317.06 | 473.68 |
表7 马斯杰德达吉斑岩(MAD-13-483)锆石Lu-Hf同位素分析结果
Table 7 Zircon Lu-Hf isotope data of the Masjed Daghi porphyry sample (MAD-13-483)
编号 | 年龄/Ma | 176Hf/177Hf(2σ) | 176Lu/177Hf(2σ) | εHf (t) | TDM /Ma | |
---|---|---|---|---|---|---|
1 | 56.16 | 0.283 02(0.000 02) | 0.000 82(0.000 02) | 9.95 | 327.79 | 492.38 |
2 | 52.30 | 0.283 05(0.000 04) | 0.000 86(0.000 01) | 10.90 | 286.45 | 427.92 |
3 | 55.33 | 0.283 03(0.000 03) | 0.000 67(0.000 04) | 10.39 | 308.30 | 463.22 |
4 | 63.14 | 0.283 02(0.000 02) | 0.001 15(0.000 02) | 10.16 | 327.80 | 484.47 |
5 | 55.90 | 0.282 99(0.000 02) | 0.000 98(0.000 01) | 8.87 | 372.20 | 561.78 |
6 | 63.85 | 0.283 02(0.000 02) | 0.000 86(0.000 01) | 10.31 | 320.33 | 475.28 |
7 | 50.23 | 0.283 07(0.000 02) | 0.000 76(0.000 01) | 11.72 | 251.33 | 373.71 |
8 | 53.91 | 0.283 02(0.000 02) | 0.000 79(0.000 03) | 9.80 | 331.75 | 500.52 |
9 | 52.87 | 0.282 87(0.000 07) | 0.001 53(0.000 02) | 4.47 | 553.33 | 841.47 |
10 | 60.06 | 0.282 98(0.000 07) | 0.000 84(0.000 01) | 8.52 | 388.31 | 586.92 |
11 | 50.92 | 0.283 12(0.000 02) | 0.000 94(0.000 01) | 13.50 | 181.36 | 259.74 |
12 | 54.09 | 0.283 03(0.000 02) | 0.001 06(0.000 02) | 10.44 | 308.08 | 459.43 |
13 | 53.01 | 0.283 03(0.000 02) | 0.000 94(0.000 01) | 10.42 | 307.13 | 459.82 |
14 | 56.37 | 0.283 03(0.000 02) | 0.000 90(0.000 01) | 10.41 | 310.16 | 463.05 |
15 | 54.35 | 0.283 04(0.000 03) | 0.000 83(0.000 01) | 10.61 | 299.63 | 448.19 |
16 | 54.00 | 0.283 05(0.000 03) | 0.000 62(0.000 04) | 11.13 | 277.45 | 414.72 |
17 | 54.00 | 0.282 99(0.000 03) | 0.000 90(0.000 03) | 8.70 | 376.72 | 571.12 |
18 | 54.00 | 0.283 04(0.000 03) | 0.001 23(0.000 02) | 10.49 | 307.20 | 456.16 |
19 | 54.00 | 0.283 04(0.000 03) | 0.000 56(0.000 01) | 10.53 | 300.85 | 453.21 |
20 | 54.00 | 0.283 06(0.000 03) | 0.000 65(0.000 01) | 11.29 | 271.31 | 404.56 |
21 | 54.00 | 0.283 07(0.000 03) | 0.000 84(0.000 01) | 11.56 | 261.58 | 387.17 |
22 | 54.00 | 0.283 06(0.000 02) | 0.000 91(0.000 02) | 11.43 | 266.99 | 395.22 |
23 | 54.00 | 0.283 06(0.000 02) | 0.000 98(0.000 01) | 11.29 | 272.91 | 404.11 |
24 | 54.00 | 0.283 01(0.000 02) | 0.001 38(0.000 01) | 9.69 | 340.61 | 507.45 |
25 | 54.00 | 0.283 03(0.000 02) | 0.001 07(0.000 01) | 10.21 | 317.06 | 473.68 |
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