Genesis and prospecting significance of Caledonian peraluminous granite in Kunlunhe area, East Kunlun
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摘要:
昆仑河地区是东昆仑造山带过铝质花岗岩分布相对集中的地区, 昆仑河过铝质花岗岩分布区形成了Li、Be、Sn等元素高背景区, 部分地区具明显的异常, 可为东昆仑造山带古生代碰撞造山过程的研究和相关稀有金属矿产成矿预测提供重要的依据。本文通过对昆仑河地区花岗岩岩相学、地球化学、同位素年代学及Hf、Sr同位素研究发现: 昆仑河地区新发现的花岗岩形成时代为早泥盆世(418~416Ma), 其岩性为黑云母花岗闪长岩、二云母花岗闪长岩和二云母花岗岩, 暗色矿物均为黑云母(≤5vol%); 为富钠弱过铝高钾钙碱性系列, Na2O/K2O平均值是1.13, A/CNK为1.03~1.10, 富集LREE, (La/Yb)N为9.7~28.1, 重稀土弱亏损, Y为8.69×10-6~23.4×10-6, Yb为0.67×10-6~2.43×10-6; Eu具较明显的负异常(Eu/Eu*=0.48~0.86), Rb/Sr比值(0.34~1.12)和Rb/Ba比值(0.18~0.32)较低; (87Sr/86Sr)i为0.7045~0.7083, εNd(t)为-4.94~-1.64, tDM2为1.56~1.29Ga; 锆石εHf(t)值分布在-3.3~2.7之间, tDM2为1.61~1.28Ga; 岩浆源于古老元古代地壳的部分熔融, 源区有地幔物质或源于地幔的新生地壳物质的参与。结合以往研究成果, 昆仑河地区存在晚志留世(425~422Ma)和早泥盆世(418~416Ma)两期过铝质花岗岩, 两者与东昆仑加里东期碰撞造山带俯冲岩石圈板片断离、幔源岩浆底侵引发的地壳熔融相关。根据1/25万化探数据做概要分析, 该花岗岩分布区显示了较好的Li、Be、Sn等矿的找矿前景。
Abstract:The Early Paleozoic peraluminous granites in the Kunlunhe area can provide important constraints on the Paleozoic collisional process and rare metal metallogenic genesis of the East Kunlun Orogenic Belt. This paper introduces the newly discovered Early Devonian (418~416Ma) peraluminous granite in the Kunlunhe area, whose lithology is biotite granodiorite, two-mica granodiorite and two-mica granite with its dark minerals all composed of biotite (≤ 5vol%). The peraluminous granites belong to a sodium-rich, weak peraluminous, high potassium and calc-alkaline series. These granite samples have averaged Na2O/K2O=1.13, and varied values of A/CNK=1.03~1.10, (La/Yb)N=9.7~28, Y=8.69×10-6~23.4×10-6 and Yb=0.67×10-6~2.43×10-6 with enrichment of LREE and weak depletion of HREE. They also have obvious Eu negative anomaly (Eu/Eu*=0.48~0.86), with relatively lower Rb/Sr (0.34~1.12) and Rb/Ba (0.18~0.32) ratios. Their (87Sr/86Sr)i, εNd(t) and tDM2 values are 0.7045~0.7083, -4.94~-1.64 and 1.56~1.29Ga, respectively. Their measured zircon εHf(t) and tDM2 are -3.3~2.7 and 1.61~1.28Ga, respectively. Its magma is originated from the partial melting of the ancient Proterozoic crust with the participation of mantle material or new crustal material from mantle. Combined with previous researches, there are two peraluminous granites series in the Kunlunhe area: the Late Silurian (425~422Ma) series and the Early Devonian (418~416Ma) series. Both of them are related to the melting of crust caused by subduction lithospheric slab break-off and mantle magma penetration in the Caledonian collision orogenic belt of East Kunlun. There is high Li, Be and Sn backgrounds with some obvious anomalies in the peraluminous granites distributed area, showing a good prospecting potential in the Kunlunhe area.
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Key words:
- Peraluminous granites /
- Caledonian /
- East Kunlun /
- Kunlunhe
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图 1
东昆仑昆仑河及邻区地理位置(a, 据Bi et al., 2022)和地质略图(b)
Figure 1.
Geographical location (a, after Bi et al., 2022) and geological sketch map (b) of Kunlunhe and its adjacent area, East Kunlun
图 2
东昆仑昆仑河地区地质简图(a)和Li元素(b)、Be元素(c)、Nb元素(d)、Sn元素(e)地球化学图(b-e数据据青海省第五地质矿产勘查院, 2013①)
Figure 2.
Geological sketch map (a) and geochemical map of elements Li (b), Be (c), Nb (d), Sn (e) of Kunlunhe area, East Kunlun
图 3
东昆仑昆仑河地区过铝花岗岩野外照片
Figure 3.
Field characteristics photographs of peraluminous granite in the Kunlunhe area, East Kunlun
图 4
东昆仑昆仑河地区过铝质花岗岩镜下照片
Figure 4.
Microscopic photographs of peraluminous granite in the Kunlunhe area, East Kunlun
图 5
东昆仑昆仑河地区过铝质花岗岩锆石(a-c)、独居石(d)的U-Pb谐和图及代表性的阴极发光图像
Figure 5.
CL images and U-Pb diagrams of representative zircons (a-c) and monazite (d) from the Kunlunhe peraluminous granite, East Kunlun
图 6
东昆仑昆仑河地区过铝花岗岩哈克图解
Figure 6.
Haker diagrams of peraluminous granite in the Kunlunhe area, East Kunlun
图 7
东昆仑昆仑河地区过铝花岗岩地球化学分类图解(a，据Middlemost, 1994; b, 据Peccerillo and Taylor, 1976; c, 据O'Connor，1965)
Figure 7.
Geochemical classification of peraluminous granites in the Kunlunhe area, East Kunlun (a, after Middlemost, 1994; b, after Peccerillo and Taylor, 1976; c, after O'Connor, 1965)
图 8
昆仑河地区过铝花岗岩球粒陨石标准化稀土元素配分图(a、c)和原始地幔标准化微量元量蛛网图(b、d)(标准化值据Sun and McDonough, 1989)
Figure 8.
Chondrite-normalized REE patterns (a, c) and primitive mantle-normalized trace-element spider grams (b, d) of peraluminous granites in the Kunlunhe area, East Kunlun (normalizing data from Sun and McDonough, 1989)
图 9
东昆仑昆仑河地区过铝花岗岩岩石地球化学图解
Figure 9.
Geochemical diagrams of peraluminous granites in the Kunlunhe area, East Kunlun
图 10
东昆仑昆仑河地区过铝花岗岩全岩(87Sr/86Sr)i-εNd(t)图解(a)和锆石t-εHf(t)图解(b)
Figure 10.
Whole rock (87Sr/86Sr)i vs. εNd(t) (a) and zircon t vs. εHf(t) (b) of peraluminous granites in the Kunlunhe area, East Kunlun
表 1
昆仑河地区过铝质花岗岩锆石U-Pb分析结果
Table 1.
LA-ICP-MS zircon U-Pb ages of peraluminous granitoids from Kunlunhe area
测点号 含量(×10-6) Th/U 同位素比值 年龄(Ma) 谐和度 总Pb Th U 
2σ 
2σ 
2σ 
2σ 
2σ 
2σ (%) LDG6，二云母花岗闪长岩 1 28 212 350 0.61 0.05554 0.00155 0.52663 0.01390 0.06865 0.00065 435 61 430 9 428 4 99 2 34 488 376 1.30 0.05573 0.00178 0.50519 0.01607 0.06548 0.00056 443 70 415 11 409 3 98 3 55 326 717 0.46 0.05570 0.00118 0.51649 0.01071 0.06703 0.00053 439 48 423 7 418 3 98 4 36 328 434 0.76 0.05545 0.00155 0.52469 0.01493 0.06839 0.00055 432 68 428 10 426 3 99 5 102 1452 1156 1.26 0.05637 0.00123 0.50942 0.01088 0.06533 0.00043 478 53 418 7 408 3 97 6 20 231 232 1.00 0.05706 0.00186 0.53492 0.01728 0.06787 0.00065 494 72 435 11 423 4 97 7 26 319 303 1.06 0.05539 0.00185 0.50695 0.01633 0.06636 0.00054 428 76 416 11 414 3 99 8 46 396 599 0.66 0.05551 0.00138 0.50112 0.01241 0.06531 0.00048 432 56 412 8 408 3 98 9 43 411 516 0.80 0.05129 0.00127 0.48145 0.01187 0.06784 0.00050 254 57 399 8 423 3 94 10 90 1101 1042 1.06 0.05351 0.00105 0.48962 0.00941 0.06622 0.00052 350 44 405 6 413 3 97 11 46 534 524 1.02 0.04925 0.00161 0.45794 0.01607 0.06684 0.00064 167 78 383 11 417 4 91 12 33 248 422 0.59 0.05304 0.00140 0.48762 0.01299 0.06637 0.00053 332 29 403 9 414 3 97 13 38 267 468 0.57 0.05799 0.00145 0.55032 0.01347 0.06869 0.00063 528 56 445 9 428 4 96 14 74 557 921 0.60 0.05225 0.00104 0.49335 0.00999 0.06820 0.00053 295 46 407 7 425 3 95 15 56 459 721 0.64 0.05446 0.00128 0.49294 0.01104 0.06551 0.00053 391 49 407 8 409 3 99 16 79 572 1023 0.56 0.05529 0.00098 0.50555 0.00895 0.06603 0.00043 433 39 415 6 412 3 99 17 121 540 1707 0.32 0.05351 0.00089 0.48859 0.00904 0.06592 0.00066 350 32 404 6 412 4 98 18 40 60.6 574 0.11 0.05257 0.00119 0.49026 0.01121 0.06739 0.00060 309 52 405 8 420 4 96 19 39 420 461 0.91 0.05352 0.00132 0.49132 0.01148 0.06645 0.00053 350 56 406 8 415 3 97 20 20 171 241 0.71 0.05697 0.00178 0.52000 0.01499 0.06641 0.00064 500 73 425 10 414 4 97 21 87 930 1036 0.90 0.05528 0.00107 0.50138 0.00940 0.06561 0.00052 433 38 413 6 410 3 99 22 194 411 2823 0.15 0.05383 0.00083 0.49129 0.00818 0.06592 0.00061 365 35 406 6 412 4 98 23 43 301 527 0.57 0.05168 0.00128 0.50615 0.01220 0.07091 0.00052 333 57 416 8 442 3 93 24 76 422 946 0.45 0.05523 0.00120 0.54338 0.01146 0.07097 0.00055 420 53 441 8 442 3 99 25 16 74.4 197 0.38 0.05451 0.00199 0.55028 0.02559 0.07201 0.00138 391 81 445 17 448 8 99 DZHG3，似斑状黑云母花岗闪长岩 1 129 560 1860 0.30 0.05503 0.00081 0.49955 0.0106 0.06587 0.00128 413 33 411 7 411 8 100 2 226 1210 3070 0.39 0.05532 0.00061 0.50509 0.00813 0.06609 0.00086 425 25 415 6 413 5 99 3 208 1090 2820 0.39 0.05579 0.00061 0.50941 0.00723 0.06619 0.00075 444 24 418 5 413 5 99 4 199 863 2700 0.32 0.05526 0.00057 0.50556 0.00714 0.06626 0.00083 423 23 416 5 414 5 100 5 266 1350 3430 0.39 0.05543 0.00042 0.50744 0.00533 0.06637 0.00063 430 17 417 4 414 4 99 6 183 1040 2390 0.44 0.05489 0.00068 0.50272 0.00784 0.06641 0.00092 408 28 414 5 415 6 100 7 184 1170 2380 0.49 0.05538 0.00041 0.50787 0.00575 0.06645 0.00065 428 16 417 4 415 4 99 8 131 559 1680 0.33 0.05555 0.00045 0.50911 0.00668 0.06648 0.00082 435 18 418 5 415 5 99 9 216 1010 2800 0.36 0.05538 0.00052 0.50892 0.00712 0.06667 0.00077 428 21 418 5 416 5 100 10 51 221 682 0.32 0.05483 0.0007 0.50408 0.0067 0.06669 0.00052 406 29 415 5 416 3 100 11 124 246 1740 0.14 0.05428 0.00079 0.50237 0.00869 0.06672 0.00087 383 33 413 6 416 5 99 12 19 163 239 0.68 0.05466 0.00113 0.50382 0.01197 0.06673 0.00101 399 46 414 8 416 6 99 13 164 828 2170 0.38 0.05461 0.00048 0.50354 0.0065 0.06677 0.00074 396 20 414 4 417 5 99 14 109 433 1490 0.29 0.05536 0.00056 0.51118 0.00662 0.06687 0.00065 427 23 419 4 417 4 100 15 66 516 805 0.64 0.0553 0.00055 0.51131 0.00562 0.06695 0.00043 424 22 419 4 418 3 100 16 114 684 1470 0.47 0.05537 0.00056 0.51168 0.00737 0.06697 0.0008 427 23 420 5 418 5 100 17 127 787 1590 0.49 0.0555 0.00047 0.51406 0.00557 0.06716 0.00057 433 19 421 4 419 4 99 18 69 418 883 0.47 0.05534 0.00055 0.51324 0.00616 0.06718 0.00057 426 22 421 4 419 4 100 19 164 752 2120 0.35 0.05437 0.00079 0.50384 0.00632 0.06725 0.00086 386 33 414 4 420 5 99 20 96 537 1240 0.43 0.05521 0.00064 0.51249 0.00795 0.06736 0.00094 421 26 420 5 420 6 100 21 210 531 2950 0.18 0.05523 0.00065 0.51923 0.00866 0.06808 0.00098 422 26 425 6 425 6 100 22 51 303 642 0.47 0.05552 0.00075 0.52439 0.00764 0.06856 0.00073 433 30 428 5 428 4 100 23 80 638 900 0.71 0.05585 0.00042 0.55217 0.00553 0.07165 0.00057 446 17 446 4 446 3 100 24 123 492 1540 0.32 0.05479 0.00063 0.54419 0.00744 0.0719 0.00076 404 26 441 5 448 5 99 25 98 382 1220 0.31 0.05606 0.00037 0.55998 0.0055 0.0723 0.00055 455 15 452 4 450 3 100 26 35 168 391 0.43 0.05663 0.00075 0.59929 0.00814 0.07688 0.00077 477 29 477 5 477 5 100 27 43 205 421 0.49 0.06084 0.00069 0.69954 0.01029 0.0833 0.00077 634 24 539 6 516 5 96 28 224 852 2370 0.36 0.06116 0.00067 0.69808 0.01068 0.08263 0.00124 645 24 538 6 512 7 95 29 115 252 948 0.27 0.07238 0.00067 1.09637 0.01657 0.1097 0.00135 997 19 752 8 671 8 89 30 36 256 380 0.67 0.1035 0.00786 1.03351 0.09037 0.06989 0.00108 1688 140 721 45 436 7 60 DZHG4，似斑状黑云母花岗闪长岩 1 215 405 2680 0.15 0.05485 0.00043 0.5113 0.00509 0.0678 0.0008 406 18 419 3 423 5 99 2 142 504 1800 0.28 0.05522 0.00054 0.50214 0.00603 0.06614 0.00076 421 22 413 4 413 5 100 3 191 725 2060 0.35 0.05529 0.00073 0.51246 0.00774 0.06755 0.00109 424 29 420 5 421 7 100 4 282 2190 3310 0.66 0.05618 0.00058 0.51352 0.00818 0.06653 0.00109 460 23 421 6 415 7 99 5 128 615 1640 0.38 0.0552 0.0007 0.50324 0.00839 0.06623 0.00091 421 28 414 6 413 6 100 6 133 574 1640 0.35 0.05543 0.00051 0.51199 0.00539 0.0672 0.00078 430 21 420 4 419 5 100 7 164 707 1930 0.37 0.05559 0.00049 0.51752 0.00511 0.06769 0.00072 436 20 424 3 422 4 100 8 188 858 2300 0.37 0.05576 0.00042 0.51086 0.00506 0.06657 0.00072 443 17 419 3 415 4 99 9 167 696 2000 0.35 0.05547 0.00041 0.51243 0.0043 0.06712 0.00058 431 17 420 3 419 4 100 10 147 744 1780 0.42 0.0553 0.00045 0.50735 0.00541 0.06668 0.00071 424 18 417 4 416 4 100 11 155 702 1920 0.37 0.05527 0.00042 0.50843 0.00498 0.0668 0.00065 423 17 417 3 417 4 100 12 252 803 3120 0.26 0.05492 0.00038 0.50678 0.00486 0.06708 0.00068 409 15 416 3 419 4 99 13 159 631 2000 0.32 0.05563 0.00041 0.5128 0.0047 0.06702 0.00061 438 17 420 3 418 4 99 14 98 344 1210 0.28 0.05566 0.00041 0.51551 0.00495 0.06735 0.00064 439 17 422 3 420 4 100 15 140 534 1750 0.31 0.05477 0.00049 0.50636 0.00507 0.06736 0.00065 403 20 416 3 420 4 99 16 204 1030 2510 0.41 0.05516 0.00041 0.50088 0.00468 0.06604 0.00058 419 17 412 3 412 4 100 17 185 862 2310 0.37 0.05436 0.00054 0.49967 0.00512 0.06682 0.00064 386 22 412 4 417 4 99 18 132 505 1630 0.31 0.05454 0.00043 0.50455 0.0049 0.06732 0.00054 393 18 415 3 420 3 99 19 121 488 1520 0.32 0.05479 0.00042 0.50159 0.00536 0.06654 0.00055 404 17 413 4 415 3 99 20 158 594 1950 0.30 0.05487 0.00051 0.51292 0.00566 0.06789 0.00059 407 21 420 4 423 4 99 21 100 522 1190 0.44 0.05586 0.00051 0.51653 0.00587 0.06729 0.00056 447 20 423 4 420 3 99 22 138 581 1720 0.34 0.05513 0.00043 0.50448 0.00559 0.06642 0.00052 418 17 415 4 415 3 100 23 262 818 3350 0.24 0.05482 0.00047 0.49661 0.00575 0.06587 0.00064 405 19 409 4 411 4 100 24 113 355 1430 0.25 0.0556 0.00056 0.50762 0.00568 0.06645 0.0006 437 22 417 4 415 4 100 25 268 724 3040 0.24 0.05499 0.00036 0.53663 0.00656 0.0709 0.00076 412 15 436 4 442 5 99 26 140 757 1530 0.49 0.0557 0.0005 0.54498 0.00873 0.07096 0.00099 440 20 442 6 442 6 100 27 202 1190 2210 0.54 0.05594 0.00046 0.55164 0.00541 0.07165 0.00081 450 18 446 4 446 5 100 28 195 561 2190 0.26 0.05512 0.00051 0.54544 0.00633 0.07191 0.00063 417 21 442 4 448 4 99 29 277 1030 3150 0.33 0.05432 0.00038 0.53704 0.0063 0.07193 0.00078 384 16 437 4 448 5 97 
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表 2
昆仑河地区过铝质花岗岩独居石U-Pb同位素测定结果
Table 2.
Monazite LA-ICPMS U-Pb data of peraluminous granitoids from Kunlunhe area
测点号 含量(×10-6) h/U 同位素比值 年龄(Ma) 谐和度 总Pb Th U 
2σ 
2σ 
2σ 
2σ 
2σ 
2σ 
2σ (%) 1 1056 53900 1850 29 0.05609 0.0004 0.50977 0.0057 0.06607 0.00074 0.02041 0.00025 418.3 3.8 412.5 4.5 454.9 15.8 99 2 2800 145000 2960 49 0.05756 0.0004 0.54189 0.00658 0.06835 0.00077 0.02103 0.00025 439.7 4.3 426.2 4.6 510.9 15.2 97 3 747 35000 2010 17 0.05602 0.00045 0.51335 0.00554 0.0665 0.00061 0.0207 0.00024 420.7 3.7 415 3.7 452.7 17.7 99 4 927 44900 2180 21 0.05564 0.00044 0.51339 0.00532 0.06701 0.00064 0.0208 0.00023 420.7 3.6 418.1 3.9 437.3 17.5 99 5 1013 51200 2070 25 0.05526 0.00036 0.51053 0.00489 0.06703 0.00061 0.02042 0.00023 418.8 3.3 418.3 3.7 421.9 14.7 100 6 1317 67000 2500 27 0.056 0.00037 0.51964 0.00564 0.06735 0.00068 0.0205 0.00022 424.9 3.8 420.2 4.1 451.7 14.8 99 7 940 44000 2510 18 0.05572 0.00034 0.51088 0.0055 0.06651 0.00065 0.02071 0.00022 419 3.7 415.1 3.9 440.7 13.4 99 8 1189 60000 2400 25 0.05525 0.00043 0.50967 0.0048 0.06699 0.00061 0.02024 0.0002 418.2 3.2 418 3.7 421.6 17.4 100 9 849 41400 2030 20 0.05521 0.00036 0.50544 0.00526 0.06639 0.00061 0.0204 0.0002 415.4 3.5 414.3 3.7 420.4 14.6 100 10 918 43900 2420 18 0.05547 0.00052 0.50457 0.00572 0.066 0.00066 0.02031 0.00023 414.8 3.9 412 4 430.9 20.8 99 11 805 38500 2180 18 0.05597 0.00045 0.50874 0.00564 0.06581 0.00057 0.02066 0.00019 417.6 3.8 410.9 3.5 450.9 17.7 98 12 820 38800 2160 18 0.05529 0.00037 0.50439 0.0046 0.06618 0.00054 0.02077 0.00021 414.7 3.1 413.1 3.3 423.5 14.8 100 13 782 38000 1910 20 0.05576 0.00046 0.50887 0.00462 0.06619 0.00051 0.02061 0.00021 417.7 3.1 413.2 3.1 442.4 18.3 99 14 836 45100 1380 33 0.05653 0.00096 0.52616 0.00968 0.06749 0.00103 0.02072 0.00036 429.3 6.4 421 6.2 472 37.5 98 15 810 38700 2170 18 0.05635 0.00045 0.51875 0.00506 0.06675 0.00054 0.02066 0.00021 424.3 3.4 416.5 3.3 465.8 17.7 98 16 777 37300 2010 19 0.05544 0.0005 0.51179 0.00495 0.06699 0.00053 0.02071 0.00021 419.7 3.3 418 3.2 429.6 20.1 100 17 1218 59500 3220 18 0.05779 0.00046 0.537 0.00654 0.06735 0.00068 0.02078 0.00022 436.4 4.3 420.2 4.1 521.2 17.6 96 18 912 44200 2150 21 0.05576 0.00036 0.51052 0.0051 0.06635 0.00053 0.02088 0.00024 418.8 3.4 414.1 3.2 442.3 14.4 99 19 758 37200 1970 19 0.05528 0.00038 0.50656 0.0051 0.06643 0.00053 0.02059 0.00025 416.1 3.4 414.6 3.2 423.2 15.3 100 20 925 42700 2550 17 0.05558 0.00045 0.5173 0.00534 0.06744 0.00056 0.02084 0.00025 423.3 3.6 420.7 3.4 435.2 17.9 99 21 1499 76900 2550 30 0.05518 0.00043 0.51489 0.00477 0.06769 0.00053 0.02112 0.00024 421.7 3.2 422.2 3.2 418.4 17.2 100 22 837 39900 2210 18 0.05553 0.00036 0.51162 0.00484 0.06682 0.00051 0.02075 0.00023 419.5 3.2 417 3.1 433.2 14.3 99 23 805 37500 2040 18 0.05597 0.00048 0.51956 0.00639 0.06731 0.0006 0.02181 0.00025 424.9 4.3 419.9 3.6 451 18.9 99 24 768 35500 1950 18 0.05509 0.00042 0.51136 0.00487 0.06735 0.00053 0.02096 0.00022 419.4 3.3 420.2 3.2 415.5 17 100 25 1312 67400 2310 29 0.05544 0.00035 0.51449 0.00465 0.0673 0.0005 0.02096 0.00022 421.5 3.1 419.8 3 429 14.3 100 26 1156 58100 2210 26 0.05544 0.00041 0.51233 0.00455 0.06707 0.00048 0.02091 0.0002 420 3.1 418.5 2.9 429.1 16.6 100 27 873 41200 2250 18 0.05537 0.00037 0.51437 0.0044 0.06737 0.00046 0.02111 0.00019 421.4 2.9 420.3 2.7 426.7 14.9 100 28 1080 51200 2590 20 0.05515 0.00034 0.51601 0.00448 0.06782 0.00047 0.02132 0.00019 422.5 3 423 2.9 418 13.9 100 29 924 44800 2090 21 0.05502 0.00036 0.51062 0.00411 0.06729 0.00041 0.02099 0.00016 418.9 2.8 419.8 2.5 412.5 14.7 100 30 831 39100 2170 18 0.05521 0.00037 0.51271 0.00451 0.06731 0.00047 0.02105 0.00015 420.3 3 419.9 2.8 420.4 14.8 100
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表 3
昆仑河地区过铝质花岗岩锆石Lu-Hf分析结果
Table 3.
Zircon in-situ Hf isotope composition of peraluminous granitoids from Kunlunhe area
Spot No. Age(Ma) 176Yb/177Hf 176Lu/177Hf 1σ 176Hf/177Hf 1σ εHf(0) εHf(t) 1σ tDM (Ma) tDM2 (Ma) fLu/Hf LDG6，二云母花岗闪长岩 1 428 0.039831 0.001320 0.000009 0.282572 0.000016 -7.1 2 0.6 970 1284 -0.96 2 409 0.034621 0.001264 0.000010 0.282583 0.000016 -6.7 2 0.6 954 1270 -0.96 3 418 0.040951 0.001403 0.000023 0.282566 0.000013 -7.3 1.5 0.5 981 1304 -0.96 4 426 0.029488 0.000973 0.000012 0.282573 0.000013 -7 2.1 0.5 960 1277 -0.97 5 408 0.071043 0.002459 0.000039 0.282661 0.000017 -3.9 4.4 0.6 870 1115 -0.93 6 423 0.031648 0.001040 0.000008 0.282493 0.000014 -9.9 -0.9 0.5 1075 1459 -0.97 7 414 0.028959 0.000964 0.000038 0.282599 0.000020 -6.1 2.7 0.7 924 1226 -0.97 8 408 0.043686 0.001521 0.000042 0.282573 0.000014 -7.1 1.5 0.5 975 1298 -0.95 9 423 0.053852 0.001788 0.000039 0.282598 0.000015 -6.2 2.6 0.5 946 1238 -0.95 10 413 0.120630 0.003945 0.000026 0.282623 0.000017 -5.3 2.7 0.6 966 1224 -0.88 11 417 0.043500 0.001510 0.000024 0.282580 0.000019 -6.8 2 0.7 964 1276 -0.95 12 414 0.030935 0.001058 0.000018 0.282571 0.000014 -7.1 1.7 0.5 966 1291 -0.97 24 442 0.041527 0.001448 0.000009 0.282580 0.000015 -6.8 2.5 0.5 963 1261 -0.96 DZHG3，似斑状黑云母花岗闪长岩 4 414 0.055250 0.001849 0.000028 0.282502 0.000016 -9.5 -0.9 0.6 1084 1457 -0.94 5 414 0.063460 0.002113 0.000069 0.282547 0.000023 -8 0.6 0.8 1028 1363 -0.94 6 415 0.064054 0.002119 0.000026 0.282443 0.000016 -11.6 -3.1 0.6 1179 1595 -0.94 7 415 0.054103 0.001712 0.000031 0.282455 0.000026 -11.2 -2.6 0.9 1149 1561 -0.95 8 415 0.074222 0.002407 0.000038 0.282458 0.000021 -11.1 -2.6 0.7 1166 1565 -0.93 9 416 0.052085 0.001711 0.000023 0.282457 0.000013 -11.1 -2.4 0.4 1145 1554 -0.95 10 416 0.040029 0.001328 0.000013 0.282486 0.000016 -10.1 -1.3 0.6 1093 1484 -0.96 11 416 0.049242 0.001635 0.000016 0.282505 0.000015 -9.4 -0.7 0.5 1075 1446 -0.95 12 416 0.033589 0.001170 0.000007 0.282444 0.000022 -11.6 -2.8 0.8 1147 1574 -0.96 13 417 0.044019 0.001481 0.000017 0.282431 0.000020 -12.1 -3.3 0.7 1175 1608 -0.96 14 417 0.040625 0.001379 0.000026 0.282439 0.000020 -11.8 -3 0.7 1161 1589 -0.96 15 418 0.049549 0.001655 0.000018 0.282474 0.000019 -10.5 -1.8 0.7 1119 1514 -0.95 16 418 0.050512 0.001658 0.000012 0.282509 0.000020 -9.3 -0.6 0.7 1069 1436 -0.95 17 419 0.037397 0.001263 0.000006 0.282451 0.000015 -11.4 -2.5 0.5 1140 1559 -0.96 18 419 0.053208 0.001748 0.000015 0.282493 0.000016 -9.9 -1.1 0.6 1095 1473 -0.95 DZHG4，似斑状黑云母花岗闪长岩 1 423 0.043278 0.001535 0.000029 0.282490 0.000014 -10 -1.1 0.5 1093 1474 -0.95 2 413 0.044350 0.001554 0.000021 0.282519 0.000016 -9 -0.3 0.6 1053 1416 -0.95 3 421 0.049473 0.001691 0.000028 0.282474 0.000016 -10.5 -1.7 0.6 1121 1513 -0.95 4 415 0.070945 0.002312 0.000050 0.282536 0.000015 -8.4 0.1 0.5 1050 1390 -0.93 5 413 0.040281 0.001390 0.000027 0.282520 0.000016 -8.9 -0.2 0.6 1046 1409 -0.96 6 419 0.046213 0.001568 0.000027 0.282465 0.000017 -10.9 -2.1 0.6 1130 1533 -0.95 7 422 0.038833 0.001326 0.000016 0.282472 0.000017 -10.6 -1.7 0.6 1112 1511 -0.96 8 415 0.045776 0.001535 0.000016 0.282487 0.000016 -10.1 -1.4 0.6 1098 1485 -0.95 9 419 0.046093 0.001515 0.000009 0.282148 0.000040 -22.1 -13.3 1.4 1577 2237 -0.95 10 416 0.040475 0.001335 0.000017 0.282451 0.000018 -11.4 -2.6 0.6 1143 1562 -0.96 11 417 0.032141 0.001150 0.000007 0.282450 0.000011 -11.4 -2.5 0.4 1139 1561 -0.97 12 419 0.036413 0.001196 0.000020 0.282491 0.000014 -9.9 -1.1 0.5 1082 1469 -0.96 13 418 0.049942 0.001781 0.000040 0.282503 0.000018 -9.5 -0.8 0.6 1081 1451 -0.95 14 420 0.029935 0.001058 0.000022 0.282471 0.000015 -10.6 -1.7 0.5 1105 1509 -0.97 15 420 0.025292 0.000942 0.000013 0.282515 0.000024 -9.1 -0.1 0.8 1041 1409 -0.97
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表 4
东昆仑昆仑河地区过铝花岗岩主量元素(wt%)、稀土和微量元素(×10-6)化学成分分析结果
Table 4.
Chemical composition data of major elements (wt%) and trace elements (×10-6) elements of peraluminous granite in the Kunlunhe area, East Kunlun
样品号 HCG1 HCG1-1 HCG1-2 LDG3 LDG3-1 LDG3-2 LDG6 LDG6-1 LDG6-2 DZHG3 DZHG3-1 DZHG4 岩体 黑刺沟岩体 老道沟岩体 大灶火沟岩体 岩性 二云母花岗岩 二云母花岗闪长岩 似斑状黑云母花岗闪长岩 SiO2 71.45 70.83 70.50 70.18 69.00 68.78 66.35 65.10 66.05 70.85 69.45 70.38 TiO2 0.42 0.41 0.43 0.35 0.34 0.34 0.54 0.51 0.43 0.37 0.39 0.36 Al2O3 14.29 15.12 14.96 15.01 16.00 16.03 15.98 17.49 17.45 15.06 15.78 14.61 FeOT 2.17 2.35 2.37 2.49 2.48 2.46 3.53 3.28 2.90 2.48 2.58 2.33 MnO 0.04 0.04 0.06 0.05 0.05 0.05 0.06 0.06 0.05 0.06 0.05 0.04 MgO 0.62 0.61 0.64 1.07 1.00 1.01 1.70 1.49 1.29 0.83 0.83 0.83 CaO 2.08 2.16 1.41 2.43 2.48 2.46 3.74 4.05 3.67 2.18 2.38 2.24 Na2O 3.39 3.52 3.71 3.29 3.46 3.42 3.79 4.14 4.09 4.67 3.80 3.40 K2O 4.03 4.12 4.55 3.94 4.04 4.15 2.36 2.54 3.05 2.28 3.70 3.87 P2O5 0.13 0.12 0.13 0.24 0.22 0.22 0.23 0.18 0.17 0.16 0.14 0.13 LOI 0.76 0.63 0.99 1.38 1.13 1.11 1.40 1.33 1.03 1.08 0.65 1.13 Total 99.38 99.91 99.75 100.43 100.20 100.02 99.67 100.17 100.18 100.00 99.76 99.33 FeO 1.37 1.49 5.03 1.52 1.44 0.75 1.74 1.38 1.20 1.43 1.04 1.44 Li 54.6 46.3 34.6 16.7 22.1 21.5 70.4 62.2 53.3 74.2 43.3 37.9 Be 3.34 3.78 3.64 3.21 3.88 3.50 2.16 2.61 3.74 6.10 4.50 3.52 Sc 4.24 4.61 5.21 4.45 4.25 4.26 7.11 6.04 4.98 4.11 4.21 4.11 V 26.2 25.0 26.4 29.5 27.0 26.9 48.8 43.7 35.9 29.3 30.1 29.1 Cr 5.6 4.9 4.5 15.1 12.3 13.1 21.9 17.7 14.1 9.2 6.7 9.0 Co 3.5 3.3 3.3 5.3 5.1 5.0 8.8 7.7 6.4 4.1 4.1 4.1 Ni 3.0 2.2 2.0 7.5 5.8 5.7 8.8 6.9 5.9 4.7 2.9 4.5 Cu 17.4 10.8 6.7 20.0 18.0 18.6 16.5 14.8 20.4 9.9 11.4 10.3 Zn 43.2 47.4 41.4 48.4 52.9 50.4 56.2 51.1 45.8 60.8 50.2 47.0 Ga 19.1 21.0 20.4 19.3 20.0 20.2 18.7 20.5 19.3 19.4 20.8 18.8 Rb 190 199 194 155 176 173 114 110 117 188 194 159 Sr 170 179 179 222 212 210 259 319 302 246 293 259 Y 23.37 19.13 22.86 12.01 12.06 12.11 16.58 12.75 8.69 13.83 15.33 14.18 Zr 267 266 271 151 151 150 173 155 135 220 234 211 Nb 13.34 13.34 14.34 12.43 11.49 11.55 9.52 8.84 7.27 12.86 12.46 11.02 Sn 4.17 4.16 4.21 4.48 4.16 4.09 2.33 1.99 2.02 4.35 4.27 3.65 Cs 8.43 7.71 3.74 3.91 6.25 5.78 9.70 5.75 6.75 15.86 11.27 6.84 Ba 960 963 1003 544 552 555 403 427 658 804 1015 828 La 45.97 49.85 44.48 33.17 32.47 33.01 22.20 30.37 23.82 39.15 53.03 48.30 Ce 89.69 97.02 86.58 66.99 66.59 67.18 45.31 65.13 50.12 70.84 97.05 91.93 Pr 10.22 10.91 9.60 7.72 7.50 7.63 5.32 7.35 5.72 7.77 9.96 9.60 Nd 36.16 38.69 34.36 28.12 27.68 28.57 19.92 27.19 20.83 26.36 33.31 32.90 Sm 6.36 7.13 6.05 5.69 5.65 5.50 4.10 4.94 4.10 4.63 5.71 5.71 Eu 1.00 1.04 0.97 0.83 0.81 0.76 1.08 1.08 1.03 0.82 0.98 0.94 Gd 4.99 4.65 4.47 4.28 4.02 3.98 3.87 3.80 2.94 3.85 3.98 4.18 Tb 0.73 0.62 0.73 0.57 0.51 0.53 0.59 0.49 0.38 0.51 0.52 0.57 Dy 4.10 3.26 3.84 2.73 2.55 2.34 3.26 2.51 1.84 2.66 2.84 2.95 Ho 0.79 0.63 0.75 0.45 0.42 0.42 0.59 0.45 0.31 0.49 0.53 0.51 Er 2.26 1.82 2.12 1.08 0.95 1.04 1.62 1.16 0.76 1.41 1.41 1.38 Tm 0.34 0.28 0.31 0.14 0.14 0.13 0.23 0.16 0.11 0.18 0.20 0.19 Yb 2.43 1.85 2.06 0.97 0.86 0.80 1.55 1.01 0.67 1.30 1.27 1.25 Lu 0.34 0.27 0.29 0.12 0.11 0.11 0.20 0.14 0.10 0.18 0.19 0.18 Hf 6.94 6.61 6.79 4.19 4.03 4.01 4.57 3.63 3.25 5.83 5.69 5.43 Ta 1.36 1.05 1.11 1.14 1.10 1.11 1.00 0.75 0.59 1.21 1.06 0.93 Tl 1.18 1.13 0.98 0.87 1.01 0.96 0.68 0.61 0.68 1.17 1.25 0.92 Pb 27.7 26.4 25.1 23.9 30.2 30.0 16.7 18.8 18.8 22.1 27.0 29.2 Th 22.6 28.6 26.7 19.3 19.2 19.6 9.6 12.2 6.8 18.9 19.4 22.1 U 2.2 2.2 1.9 2.0 1.9 1.9 2.4 1.7 1.1 1.8 2.2 2.4 Zr/Hf 38.5 40.2 39.9 35.9 37.5 37.5 37.9 42.7 41.5 37.7 41.1 38.9 Nb/Ta 9.80 12.74 12.94 10.95 10.41 10.42 9.52 11.72 12.34 10.61 11.70 11.91 Sr/Y 7.28 9.37 7.82 18.48 17.56 17.35 15.63 25.04 34.69 17.81 19.11 18.26 Rb/Sr 1.12 1.11 1.08 0.70 0.83 0.82 0.44 0.34 0.39 0.76 0.66 0.61 Rb/Ba 0.20 0.21 0.19 0.28 0.32 0.31 0.28 0.26 0.18 0.23 0.19 0.19 ∑REE 205 218 197 153 150 152 110 146 113 160 211 201 (La/Yb)N 12.8 18.2 14.6 23.1 25.6 27.7 9.7 20.3 24.0 20.4 28.2 26.0 Eu/Eu* 0.53 0.52 0.55 0.49 0.50 0.48 0.82 0.74 0.86 0.58 0.60 0.56 (La/Sm)N 4.55 4.40 4.63 3.67 3.62 3.78 3.41 3.87 3.66 5.32 5.84 5.32 (Gd/Yb)N 1.66 2.03 1.75 3.57 3.81 4.01 2.03 3.05 3.55 2.41 2.54 2.70 A/CNK 1.04 1.07 1.10 1.06 1.10 1.10 1.03 1.03 1.04 1.07 1.08 1.05 Na2O+K2O 7.41 7.64 8.27 7.24 7.50 7.57 6.15 6.68 7.14 6.95 7.50 7.27 Na2O/K2O 0.84 0.85 0.82 0.83 0.86 0.83 1.61 1.63 1.34 2.05 1.03 0.88 CaO/Na2O 0.62 0.61 0.38 0.74 0.72 0.72 0.99 0.98 0.90 0.47 0.63 0.66 FeOT/MgO 3.49 3.86 3.69 2.32 2.48 2.44 2.08 2.20 2.25 2.97 3.11 2.81 TE1, 3 0.81 0.79 0.82 0.82 0.81 0.80 0.82 0.80 0.81 0.79 0.79 0.81
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表 5
昆仑河地区过铝花岗岩全岩Sr-Nd同位素组成
Table 5.
Sr-Nd isotopic compositions of peraluminous granites in the Kunlunhe area, East Kunlun
样品号 Age (Ma) 
2σ 
2σ 
εNd(t) tDM1(Ga) tDM2(Ga) LDG6 416 1.273363 0.712037 0.000007 0.7045 0.124306 0.512357 0.000005 0.512019 -1.64 1.35 1.29 LDG6-1 0.992593 0.711698 0.000007 0.7058 0.109687 0.512293 0.000007 0.511994 -2.11 1.26 1.33 HCG1 3.236324 0.725998 0.000007 0.7068 0.106320 0.512214 0.000006 0.511924 -3.47 1.33 1.44 HCG1-1 3.213411 0.725944 0.000007 0.7069 0.111320 0.512204 0.000005 0.511901 -3.93 1.41 1.48 DZHG3 2.208355 0.721406 0.000009 0.7083 0.106142 0.512138 0.000007 0.511848 -4.94 1.44 1.56
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