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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (5): 659-677.doi: 10.11872/j.issn.1005-2518.2019.05.659

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Trace Elemental Compositions of Iron Oxides from the Lannitang Porphyry Cu-Au Deposit in the Zhongdian Region (Northwest) and the Geological Significances：A LA-ICP-MS Study

Jianheng GUO1,2(),Chengbiao LENG1,3(),Xingchun ZHANG1,Wei ZHANG1,Chongjun YIN4,Lujia ZHANG4,Zhendong TIAN1,2   

  1. 1. State Key Laboratory of Ore Deposit Geochemistry，Institute of Geochemistry，Chinese Academy of Sciences，Guiyang 550081，Guizhou，China
    2. Chinese Academy of Science University，Beijing 100039，China
    3. State Key Laboratory of Nuclear Resources and Environment，East China University of Technology，Nanchang 330013，Jiangxi, China
    4. Yunnan Huaxi Mineral Resources Co. ，Ltd. ，Kunming 650200，Yunnan，China
  • Received:2019-06-28 Revised:2019-08-03 Online:2019-10-31 Published:2019-11-07
  • Contact: Chengbiao LENG E-mail:124322611@qq.com;lcb8207@163.com

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Abstract:

The Zhongdian area, located in northwestern Yunnan, is an important porphyry belt in China. It hosts a large number of Triassic intermediate-felsic porphyritic intrusions and porphyry deposits such as Pulang porphyry Cu-Au, Xuejiping porphyry Cu, Chundu porphyry Cu, Langdu Cu skarn and Lannitang porphyry Cu-Au deposit. The Lannitang porphyry Cu-Au deposit is located in west belt of the Zhongdian area. The magnetite in Lannitang porphyry Cu-Au deposit is widespread and it occurred as disseminated and vein types in potassic and chlorite-sericite alteration zone.Specularite is also observed frequently in the post-mineralization dolomite-quartz coarse veins.We conducted the petrography and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to determine the texture and composition of iron oxides (magnetite and specularite). In this study, we identified three types of magnetite. Type-Ⅰ magnetite is disseminated in potassic alteration of deposit. It is generally contains ilmenite lamellas. Type-Ⅱ and Type-Ⅲ magnetite are occurred in magnetite single vein and magnetite-bearing quartz stockwork vein separately. Type-Ⅱ and Type-Ⅲ are distributed in potassic and chlorite-sericite alteration zone. The LA-ICP-MS analyses show that Type-Ⅰ magnetite is relatively rich in V, Ni and Mg than other two types of magnetite. Type-Ⅱ and Type-Ⅲ magnetite are more enriched in Mn, Zn, Sn, Sc and high-Ni/Cr ratio than Type-Ⅰ magnetite.Type-Ⅱ and Type-Ⅲ magnetite has similar content of many trace elements. The concentration of Cr,Ga,Ni and Co in specularite is obviously lower than those of magnetite. The ilmenite lamellae and low-Ni/Cr(Ni/Cr<1) ratio revealed that Type-Ⅰ magnetite belongs to igneous magnetite. Type-Ⅱ and Type-Ⅲ are distributed in veinlets and displayed high-Ni/Cr ratio (Ni/Cr>1). We suggested that they are hydrothermal magnetite. Type-Ⅰ magnetite (igneous) is intergrown with hydrothermal minerals including chlorite and sericite and it has quiet similar contents of Ti, Al and Cr with the other two hydrothermal magnetite.We suggest that Type-Ⅰ magnetite (igneous) experienced late-stage fluid alteration, which induced the loss of Ti, Al and Cr.The similar content of trace element between Type-Ⅱ and Type-Ⅲ magnetite indicated that they may precipitate from same period of fluid.In combination with previous studies, we propose that the presence of elements such as Al, Mn, Mg and Sc are in solid solution within magnetite (and/or specularite),but the Ca, S, Cu, Ba, Sr and Zr may be present in micro-/nano-scale mineral inclusions.The widespread presence of magnetite-hematite and specularite in the potassic alteration zone and low Mn concentration of magnetite indicates a high oxygen fugacity of the Lannitang porphyry Cu-Au deposit (magnetite-hematite buffer).

Key words: porphyry Cu-Au deposit, magnetite, LA-ICP-MS, fugacity, hydrothermal alteration, Lannitang, Northwest Yunnan

CLC Number: 

  • P618.51

Fig.1

Regional geological map of the Zhongdian arc（modified after references [30,31]）"

Fig.2

Geological sketch map of the Lannitang porphyry Cu-Au deposit (modified after reference [34])"

Fig.3

Cross section of No.1 exploration line in the Lannitang porphyry Cu-Au deposit （location in Fig.2；modified after reference [34]）"

Fig.4

Photos of some representative ore samples at different mineralization stages from the Lannitang porphyry Cu-Au deposit"

Fig.5

Microphotos of typical ore samples from Lannitang porphyry Cu-Au deposit"

Table 1

Ore sample number,location and its description"

样品编号 钻孔编号 采样位置/m 磁铁矿分类 样品描述
ZK1-2-6 ZK1-2 180 Ⅰ类+Ⅲ类 绿泥石—绢云母化，石英+磁铁矿脉体
ZK1-2-7 ZK1-2 251 Ⅰ类+Ⅲ类 绿泥石—绢云母化，石英+磁铁矿脉体
ZK1-2-9 ZK1-2 279.5 Ⅲ类 绿泥石—绢云母化，石英+磁铁矿脉
ZK1-2-11 ZK1-2 326 Ⅱ类 钾化叠加绿泥石—绢云母化，单一磁铁矿脉
ZK1-2-16 ZK1-2 360 Ⅲ类 钾化蚀变，石英+磁铁矿脉
ZK1-2-30 ZK1-2 720 Ⅰ类 钾化蚀变，单一磁铁矿脉与石英+磁铁矿脉体
ZK3-7-2 ZK3-7 196.7 Ⅲ类 钾化蚀变叠加绿泥石—绢云母化蚀变石英+磁铁矿脉
ZK3-7-4 ZK3-7 198 Ⅲ类 钾化蚀变叠加绿泥石—绢云母化石英+磁铁矿脉
ZK3-7-5 ZK3-7 198.7 Ⅱ类 钾化蚀变叠加绿泥石—绢云母化蚀变单一磁铁矿脉与石英+磁铁矿脉
ZK3-7-9 ZK3-7 228 Ⅱ类+Ⅲ类 钾化蚀变，石英+磁铁矿脉
ZK3-7-10 ZK3-7 312 镜铁矿 绿泥石—绢云母化蚀变，石英+白云石+黄铁矿+镜铁矿
ZK3-7-11 ZK3-7 314 Ⅲ类 钾化蚀变，石英+磁铁矿呈网脉状
ZK4-7-9 ZK4-7 895 Ⅰ类+Ⅲ类 绿泥石—绢云母化蚀变，石英+磁铁矿脉
LNT14-2 平硐矿石堆 Ⅰ类+Ⅲ类 钾化蚀变叠加绢云母化蚀变，石英+磁铁矿脉

Fig.6

Multi-element spider diagrams of iron oxides from the Lannitang porphyry Cu-Au deposit"

Fig.7

Box and whisker plots for important magnetite minor and trace element of iron oxides from the Lannitang porphyry Cu-Au deposit"

Table 2

LA-ICP-MS trace element analysis data of iron oxides from the Lannitang porphyry Cu-Au deposit（×10-6）"

样品 Ⅰ类：浸染状磁铁矿（17个）
w(FeO)/% Mg Al Sc Si Ca Ti V Cr Mn Co Ni Zn Cu Ga Sn Pb
1-2-7-01 97.3 980 2 044 4.91 4 321 445 5 675 623 3.3 27.1 23.2 24.0 75.7 0.2 4.15 8.6 1.1
LNT14-2-01 98.6 18 59 0.58 1 599 58.3 5 364 663 131.0 1.2 20.3 21.1 47.2 0.3 3.21 7.1 5.6
LNT14-2-02 98.5 291 226 0.50 1 457 <LOD 5 475 566 3.8 20.8 20.2 28.8 37.8 2.9 3.28 6.2 5.8
LNT14-2-03 98.8 34 171 0.58 1 538 9.9 4 302 634 8.0 1.3 23.1 21.0 41.0 0.2 3.65 5.8 3.3
LNT14-2-04 98.2 61 242 0.46 1 403 1 178 7 039 782 207.0 4.4 13.6 13.7 49.9 0.6 3.66 7.4 3.4
LNT14-2-05 98.3 37 215 0.74 1 345 82.9 6 903 680 158.0 1.3 16.0 19.6 36.0 0.8 3.33 7.9 5.1
LNT14-2-06 97.3 134 3 287 0.55 1 455 838 7 335 780 148 6.6 22.3 13.3 68.9 0.1 13.4 7.7 2.4
1-2-6-16 97.4 271 1 924 1.42 3 840 478 6 645 629 192 2.3 14.3 21.4 28.9 1.2 5.0 8.3 11.8
1-2-7-03 98.4 115 441 1.06 2 010 1 322 5 246 972 206 2.6 12.5 21.3 74.7 <LOD 4.07 6.8 4.6
1-2-7-05 98.2 377 1 775 1.56 1 155 45.2 2 381 1 335 197 7.8 28.7 45.7 11.2 12.0 1.67 4.2 7.3
1-2-30-1-10 97.8 632 1 516 1.46 9 132 1 737 3 922 2 233 209 3.8 10.0 57.4 21.1 3.4 3.29 5.4 3.1
1-2-30-1-12 96.8 3 532 4 103 0.84 5 593 34.3 1 244 1 347 320 10.5 7.4 72.9 31.2 2.8 5.82 1.4 8.5
1-2-30-1-14 95.4 1 102 5 168 2.72 5 671 1 159 8 767 1 135 126 20.6 10.0 22.9 39.2 36.0 4.18 7.7 48.9
4-7-9-1-01 96.2 782 3 703 3.41 3 074 <LOD 8 897 1 646 216 26.2 10.6 28.5 36.6 40.9 5.46 10.1 47.3
4-7-9-1-02 96.4 1 115 3 774 2.59 3 762 40.6 6 656 1 499 236 30.1 11.0 24.7 47.5 31.5 5.14 6.7 36.0
4-7-9-1-03 95.6 1 508 4 378 15.4 7 207 1 282 7 410 1 679 6.5 27.5 10.0 28.7 22.1 1.6 3.96 6.2 2.7
4-7-9-1-04 95.6 8 062 700 1.25 1 965 268 3 434 1 363 68.5 6.8 7.9 10.9 66.4 0.7 4.19 2.3 21.9
平均值 97.3 1 121 1 984 2.35 3 325 561 5 688 1 092 143 11.8 15.4 28.0 43.3 7.96 4.56 6.46 12.8
标准差 1.15 1 987 1 746 3.58 2 372 595 2 118 487 95.3 10.8 6.4 16.2 19.0 13.41 2.48 2.14 15.4
样品 Ⅱ类：单一磁铁矿脉（15个）
w(FeO)/% Mg Al Sc Si Ca Ti V Cr Mn Co Ni Zn Cu Ga Sn Pb
3-7-5-08 98.4 86 383 1.23 1 793 48.4 5 395 973 6.9 3.5 27.9 28.8 68.8 3.4 3.83 6.7 10.5
3-7-5-10 95.3 1 676 4 686 16.58 1 256 41.2 7 127 561 119.0 18.3 26.9 37.5 47.4 1.1 7.29 5.2 2.1
3-7-5-11 99.0 210 490 1.55 1 324 143 1 809 895 4.7 5.8 28.6 23.2 37.9 2.6 2.86 6.5 2.7
3-7-5-12 97.1 1 447 2 499 9.08 6 241 1362 3 378 893 6.6 15.6 27.3 24.4 63.8 1.0 4.63 1.5 0.1
3-7-9-01 97.0 1 793 2 258 11.23 946 21.9 3 184 708 11.9 17.1 27.8 24.9 59.1 0.9 4.23 2.9 0.5
3-7-9-02 99.2 20 74 0.94 1 862 348 2 267 887 11.2 4.2 54.0 45.6 27.8 3.0 2.29 2.8 1.0
3-7-9-03 97.0 831 1 416 7.07 1 321 175 9 542 1 083 20.6 9.3 55.6 39.3 <LOD 0.2 3.09 2.1 0.1
3-7-9-07 98.0 120 285 2.09 2 915 800 7 943 1 598 4.3 3.4 53.3 34.5 33.9 1.1 2.18 8.6 1.2
1-2-11-01 98.2 486 764 1.20 1 428 1 085 3 649 796 62.7 5.9 14.2 11.9 17.7 1.6 2.92 7.8 2.1
1-2-11-01 97.9 670 680 1.78 2 316 1 394 5 656 886 27.5 6.9 13.6 12.3 15.8 1.3 2.41 10.2 0.2
1-2-11-04 96.8 700 4 322 2.70 2 883 153 8 943 889 12.7 7.2 16.0 9.3 25.8 1.8 9.8 5.0 17.9
1-2-11-04 98.0 378 866 1.86 1 683 623 5 278 2 243 245 9.0 15.7 18.1 33.8 1.5 3.75 10.2 0.3
1-2-11-05 98.4 682 297 1.83 16 132 700 5 315 781 8.3 7.3 13.7 16.7 13.7 0.9 2.72 10.1 10.0
1-2-11-06 98.2 465 959 0.85 3 642 172 4 373 707 24.8 2.8 14.8 15.3 10.2 0.8 2.55 3.5 18.3
1-2-11-07 97.4 1 439 2 441 3.62 4 559 1 303 3 438 871 11.2 8.0 15.0 17.3 17.4 2.1 2.84 4.5 23.0
平均值 97.7 734 1 495 4.20 3 353 558 5 153 985 38.5 8.3 27.0 23.9 33.8 0.8 3.83 3.5 18.3
标准差 0.99 590 1 457 4.70 3 820 518 2 361 417 64.5 4.9 15.4 11.1 19.4 22.6 2.1 3.5 19.6
样品 Ⅲ类：石英+磁铁矿脉
w(FeO)/% Mg Al Sc Si Ca Ti V Cr Mn Co Ni Zn Cu Ga Sn Pb
1-2-7-06 95.8 2 831 5 495 22.97 1 708 59.9 7 338 427 3.9 5.6 4.5 13.2 147.2 2.1 7.43 4.5 23.0
1-2-7-09 97 1 232 3 801 2.01 2 106 266 4 229 1 034 15.4 1.6 3.5 32 139 2.84 7.32 5.95 7.1
1-2-7-10 97.3 860 3 832 4.17 5 221 156 5 882 1 234 5 28.7 3.3 6.3 77.2 4.91 18.58 3.17 8.1
3-7-11-01 98.8 148 1 512 1.43 5 989 111 2 248 1 210 1.1 9.5 2.8 8.6 17.2 <LOD 9.97 <LOD <LOD
3-7-11-02 97.1 1 187 3 350 13.42 9 929 806 6 084 1 146 4.7 21.4 2.2 12.9 63.7 1.3 36.5 11 0.3
样品 w(FeO)/% Mg Al Sc Si Ca Ti V Cr Mn Co Ni Zn Cu Ga Sn Pb
3-7-11-04 97.7 705 4 221 12.38 3 510 230 4 049 842 3.4 44.2 4.7 12.9 144.4 <LOD 58.41 8.5 10.1
3-7-11-05 98.5 76 302 0.4 1 384 159 5 949 433 159 2.7 16.5 23 101.6 2.4 4.4 11.9 0.5
3-7-11-07 96.3 1 549 2 813 8.2 4 843 114 3 987 402 32.5 14.8 12.9 27.9 95.4 0.3 6.2 3.0 0.6
3-7-11-09 96.2 816 196 0.78 2 971 40.7 18 451 895 8.4 107.1 1.2 1.5 18.8 0.5 3.5 4.2 3.9
1-2-9-01 98.5 27 250 0.69 3 011 46.5 6 205 687 10.5 2.2 18.4 17.6 76.8 1.2 4.08 4.8 6.8
1-2-9-03 98.2 122 978 1.26 2 162 2 6 658 706 3.8 1.6 17.4 17.3 83.8 0.2 4.44 9.2 5.6
1-2-9-05 98.8 45 80 0.32 1 236 379 4 104 452 3.5 1.3 17.8 20.7 40.1 0.6 4.18 10.3 3.1
1-2-9-07 96.0 1 039 3 822 12.06 1 061 50 4 424 383 3.4 6.7 18.9 22.7 86.8 0.2 7.59 15.0 3.4
1-2-16-01 96.9 268 3 085 1.27 4 443 432 4 800 371 10.8 2.1 12.4 26.6 66.0 0.3 6.81 9.5 1.2
1-2-16-02 98.5 11 102 0.76 6 147 106 5 909 533 6.3 0.6 18.0 15.7 101.4 0.1 4.02 10.4 8.4
1-2-16-03 98.9 32 173 0.7 3 507 30.2 3 374 491 4.3 1.9 16.3 20.3 227.3 <LOD 3.27 8.8 5.3
1-2-16-05 98.4 83 523 0.63 5 043 98.5 4 727 464 5.6 1.3 14.2 20.7 91.1 0.8 3.78 8.8 26.8
LNT14-2-09 96.7 1 122 3 018 6.4 3 778 127 8 464 1 088 3.7 13.3 27.0 23.2 73.7 2.6 7.43 5.7 11.3
LNT14-2-11 96.0 2 233 3 795 17.32 2 851 39.1 6 398 1 041 16.9 24.8 26.3 26.4 82.6 0.2 8.43 2.6 1.0
LNT14-2-13 95.8 1 097 5 879 10.54 7 826 151 6 705 1 174 5.2 4.8 29.4 16.0 426.1 4.5 11.61 9.4 13.0
4-7-5-03 99.0 10 69 1.09 2 845 56 2 319 1 421 192 4.4 53.2 27.4 34.8 0.2 2.38 6.6 <LOD
4-7-5-04 96.1 1 305 2 040 5.97 3 032 25.2 9 257 1 256 3.1 10.8 54.9 34.4 75.3 1.1 2.95 8.0 4.1
4-7-5-05 94.7 5 157 7 328 1.59 7 391 710 3 560 279 9.3 10.1 12.1 75.0 41.0 1.7 6.39 6.8 1.0
4-7-5-06 96.9 1 770 3 690 2.15 1 868 37 2 066 185 7.2 5.2 10.9 66.8 17.4 1.3 4.74 16.1 4.3
4-7-5-07 97.9 1 626 2 831 3.24 2 440 197 849 141 3.6 5.9 13.8 75.4 19.0 1.0 5.13 8.4 0.1
4-7-5-08 98.4 686 2 250 1.17 5 017 557 2 767 227 91.3 5.2 12.1 37.4 13.3 1.8 3.66 8.4 <LOD
4-7-5-09 97.2 591 3 166 2.60 5 908 398 4 790 670 29.6 11.3 13.7 28.2 15.0 3.9 2.12 4.0 4.1
4-7-5-10 96.7 763 4 359 2.46 1 888 10.6 3 748 681 37.7 9.2 13.8 29.9 17.2 1.2 2.19 4.4 3.2
1-2-6-01 97.0 756 3 395 2.75 4 963 335 5 446 626 122 14.1 16.3 28.5 16.7 5.8 1.62 5.8 7.9
1-2-6-02 97.7 374 3 103 1.23 1 079 38.9 3 733 731 34 12.8 13.1 37.0 13.4 3.4 3.55 6.3 6.0
样品 w(FeO)/% Mg Al Sc Si Ca Ti V Cr Mn Co Ni Zn Cu Ga Sn Pb
1-2-6-02 97.7 374 3 103 1.23 1 079 38.9 3 733 731 34.0 12.8 13.1 37.0 13.4 3.4 3.55 6.3 6.0
1-2-6-03 98.1 423 1 742 1.74 1 037 89.7 3 546 738 42.5 9.6 14.0 31.5 13.4 1.7 1.86 4.3 16.6
1-2-6-04 97.6 808 2 659 2.08 1 499 139 4 334 690 35.5 17.4 11.9 30.9 17.5 7.6 2.07 6.6 7.1
1-2-6-05 96.1 2561 4 951 15.72 2 649 428 4 376 138 14.8 42.2 17.3 27.3 33.6 0.1 2.67 5.0 1.2
1-2-6-06 95.3 2773 5 650 13.94 2 146 705 7 544 277 4.2 59.9 16.9 25.7 46.4 1.9 3.03 3.1 4.0
1-2-6-08 95.0 3141 6 430 18.68 2 269 154 3 629 76 12.3 49.9 17.6 28.5 42.5 <LOD 3.85 5.6 2.1
1-2-6-09 96.6 2103 3 795 17.01 1 293 58.5 2 519 14 4.2 44.7 17.7 23 42.5 1.4 3.49 6.9 6.7
1-2-6-10 96.1 927 3 327 6.02 1 369 122 8 470 1637 15.6 16.1 8.1 26.5 23.4 0.6 5.36 4.3 2.0
1-2-6-11 95.8 852 3 690 3.54 2 209 82.2 11 094 1299 17.9 14.5 9 19 35.7 0.7 4.23 8.0 1.4
1-2-6-12 98.4 658 1 144 3.17 1 843 21.3 4 147 753 0.1 15.1 11.9 33.1 69.8 0.7 4.92 6.3 2.3
1-2-6-13 97.9 935 1 895 3.02 1 886 162 5 125 725 11.3 6.9 12.6 33.3 86.6 1.8 5.44 6.3 0.4
1-2-6-14 95.5 3 830 4 692 4.9 2 207 130 5 632 718 20.8 73.3 12.3 30.4 176.1 0.2 8.24 2.9 0.3
1-2-6-15 98.3 158 330 2.55 3 611 416 6 018 828 1.4 4.6 12.5 31.3 152.9 2.3 4.62 10.3 1.3
3-7-9-08 96.4 2 423 2 694 6.72 1 933 45.9 8 212 808 11.4 118 11.7 31.5 112.8 7.7 6.32 4.1 0.8
3-7-4-05 98.8 251 598 2.2 1 560 276 3 998 730 12.5 1.9 12.5 25.8 86.1 25.7 4.65 5.4 0.7
3-7-4-06 98.3 686 1 739 2.73 1 755 305 4 133 734 1.2 7.0 12.5 25.2 113.5 <LOD 4.98 3.8 0.3
3-7-2-09 98.0 370 2 162 4.35 3 741 523 6 435 709 10.8 4.9 12.9 19.4 219.3 <LOD 6.27 6.2 0.3
3-7-2-10 96.9 1 024 2 364 11.62 5 853 946 9 042 967 2.8 27.8 14.1 25.0 39.7 9.1 14.44 5.4 6.8
3-7-2-11 97.7 183 324 9.39 1 621 144 9 116 930 6.3 13.1 13.2 15.5 22.8 10.3 12.57 4.9 8.6
4-7-9-3-01 98.4 368 766 2.62 2 236 664 4 535 911 12.5 39.5 8.5 19.3 65.5 10.6 17.42 5.2 5.7
4-7-9-3-02 98.2 764 1 642 4.24 1 657 85.7 2 133 923 16.8 20.3 14.2 27.1 26.4 15.8 3.82 6.0 6.4
4-7-9-3-03 95.6 1 141 5 190 10.51 4 650 148 8 234 886 2.2 6.2 29.1 15.6 1 139 10.3 7.72 4.6 9.7
4-7-9-3-04 97.5 559 2 951 3.14 1 458 110 3 795 747 4.8 4.7 34.3 22.1 138.3 13.4 6.99 6.2 8.5
4-7-9-3-05 99.2 29 286 0.15 1 763 705 755 1184 6.9 0.4 0.1 <LOD 1.5 1.3 2.08 10.9 0.5
平均值 97.3 1047 2651 5.51 3158 231 5384 729 20.9 18.6 15.2 26.4 97 3.61 7.35 6.8 5.28
标准差 1.18 1064 1853 5.64 1966 235 2887 365 37.6 24.8 10.4 13.8 163 5.04 9.06 2.96 5.56
样品 镜铁矿（8个）
w(FeO)/% Mg Al Sc Si Ca Ti V Cr Mn Co Ni Zn Cu Ga Sn Pb
3-7-10-01 97.7 2 893 708 0.14 2 068 1 183 4 204 1 636 8.1 61.9 5.3 0 124.6 0.6 3.8 <LOD 21.3
3-7-10-02 98.6 1 123 419 0.33 1 554 458 3 199 935 1.7 25 1.6 0.7 39.1 0.6 2.44 0.1 8.9
3-7-10-03 98.7 15 842 0.27 1 849 83.4 3 128 1 204 12.5 0 0.3 2.4 10.0 0.7 2.74 <LOD 0.7
3-7-10-04 98.4 33 1 335 <LOD 1 249 32.3 4 219 1 814 8.3 2.5 0.3 <LOD 10.0 <LOD 2.96 0.1 1.5
3-7-10-05 99.0 10 1 105 0.09 1 174 63.7 1 965 759 9.9 3.4 0.3 0.2 6.3 0.3 2.6 <LOD 24.6
3-7-10-06 97.9 51 726 1.88 994 502 9 040 318 1.7 1.3 1.4 1.7 10.3 0.5 3.53 19.5 3.2
4-7-8-01 99.1 7 230 0.35 1 359 43.3 3 154 181 <LOD 0 0.5 0.3 2.8 <LOD 2.32 8.8 0.8
4-7-8-02 97.4 12 876 0.9 805 402 12 028 482 6.9 0.7 1.1 1.9 12.1 0.7 2.97 10.2 2.0
平均值 98.4 518 780 0.5 1 381 346 5 117 916 6.14 11.9 1.35 0.9 26.9 0.43 2.92 4.84 7.87
标准差 0.62 1 034 352 0.62 425 392 3 509 599 4.48 21.9 1.68 0.96 41.0 0.3 0.52 7.32 9.71

Fig.8

Time resolved signals for LA-ICP-MS analyses of four samples"

Fig.9

Correlation plots of some elements for iron oxides from the Lannitang porphyry Cu-Au deposit"

Fig.10

Oxygen fugacity and oxidation potential of sulfate at the stage of porphyry mineralization （modified after references [54,57]）"

Fig.11

Discrimination diagram of magnetite genesis in Lannitang porphyry Cu-Au deposit[9,10] （a）（Ti+V）-Ni/（Cr+Mn）；（b）（Ti+V）-（Al+Mn）"

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