U-Pb Zircon Age, Geochemistry and Geological Significance of the Late Silurian Diabase in the Southwest Margin of Tarim
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摘要:
塔西南缘铁克里克构造带叶城一带古元古代花岗岩体及赛图拉岩群中大量发育辉绿岩脉（墙）群，通过对其进行详细的地质、年代学、地球化学和构造环境研究，结果表明, 该辉绿岩属于亚碱性拉斑玄武岩系列，具有高Fe、Ti，富Na，贫K的特征，球粒陨石标准化稀土元素配分图表现为LREE略富集的右倾分配模式，富集大离子亲石元素，相对亏损高场强元素，具有板内玄武岩特征。岩石成因研究表明，其具亏损岩石圈地幔源区特征，并受俯冲流体或熔体交代混染，原始岩浆源区主要为尖晶石二辉橄榄岩。辉绿岩形成于板内拉张环境。辉绿岩获得LA-ICP-MS锆石U-Pb年龄为（424±2.7）Ma，形成于晚志留世，结合西昆仑区域构造演化，认为该时期处于造山期后阶段，代表了原特提斯洋构造旋回的结束。辉绿岩中含有大量捕获锆石，第一组捕获锆石年龄为（2 242±19）Ma，表明铁克里克陆块确实存在古元古代结晶基底，第二组捕获锆石年龄为（1 842±42）Ma，代表了塔里木克拉通古元古代晚期的岩浆和构造记录。
Abstract:There are a large number of diabase dikes (walls) developed in the paleoproterozoic granite body and Setula Group in the Yecheng area of Tiekerike structural belt, southwestern margin of Tarim Basin. Through detailed geological, chronological, geochemical and tectonic environment studies, the results show that the diabases belong to the subbasic lapidous basalt series, with the characteristics of high Fe, Ti, Na and low K.The chondrite normalized REE patterns show the slightly enriched of LREE, which are right-sloping distribution. The diabases enrich LILEs and relatively loses HFSEs, resembling the feature of intraplate basalts. The study of lithogenesis showed that the diabases had the characteristics of a depleted lithospheric mantle source, and were mixed by subduction fluid or melt, and the original magma source area were mainly spinel dipyroxene peridotite. Diabases were formed in an intraplate tensioning environment. The LA-ICP-MS zircon U-Pb age of (424±2.7) Ma was obtained from diabase, formed in the Late Silurian, combined with the tectonic evolution of the West Kunlun region, it is believed that this period is in the post-orogenic stage, representing the end of the tectonic cycle of the original Proto-Tethyan Ocean. Diabases contain a large amount of inherited zircon, the first group inherits the zircon age of (
2242 ±19) Ma, which indicates that there is a Paleoproterozoic crystalline basement in the Tiekerek block, and the second group inherits the zircon age of (1 842±42) Ma, representing the magmatic and tectonic records of late Paleoproterozoic Tarim Craton. -
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图 5 TAS岩石分类命名图解（a）（底图据Cox et al.，1979）及FeOT/MgO-TiO2图解（b）（底图据Miyasiro，1974）
Figure 5.
图 7 辉绿岩Fe/Mn-CaO（a）、Fe/Mn-MgO（b）、Fe/Mn-Fe2O3T（c）和Fe/Mn-MnO（d）源区判别图解（底图据Li, 2016）
Figure 7.
图 8 辉绿岩的La/Yb-Dy/Yb图解（据Bogaard et al., 2003）
Figure 8.
图 9 辉绿岩Yb-Th/Ta图解（底图据Schandl et al.，2002）
Figure 9.
表 1 辉绿岩的LA-ICP-MS锆石U-Pb分析结果
Table 1. Table of dating analysis of diabase zircon LA–ICP–MS
样品编号 含量（10−6） Th/U 同位素比值 同位素年龄（Ma） Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ HL-6TW-1 315.95385 469.45 764.58 0.61 0.11275 0.00126 5.2058 0.05872 0.3349 0.00349 1844 9 1854 10 1862 17 HL-6TW-2 571.96792 949.62 1395.57 0.68 0.1115 0.00116 5.01132 0.05296 0.32601 0.00332 1824 9 1821 9 1819 16 HL-6TW-3 209.55952 215.47 345.33 0.62 0.16331 0.00214 10.57378 0.13946 0.46963 0.00541 2490 10 2486 12 2482 24 HL-6TW-4 31.56621 229.84 388.43 0.59 0.05612 0.00107 0.52255 0.00969 0.06754 0.00077 457 22 427 6 421 5 HL-6TW-5 23.91901 182.49 291.96 0.63 0.05695 0.00108 0.53845 0.00991 0.06858 0.00078 490 22 437 7 428 5 HL-6TW-6 136.2894 167.45 223.16 0.75 0.15963 0.00189 10.16874 0.12075 0.46203 0.00499 2452 9 2450 11 2449 22 HL-6TW-7 114.47227 375.83 1528.36 0.25 0.05587 0.00062 0.52261 0.00579 0.06785 0.00069 447 11 427 4 423 4 HL-6TW-8 46.12337 247.93 586.97 0.42 0.05539 0.00152 0.52327 0.01388 0.06851 0.0009 428 36 427 9 427 5 HL-6TW-9 37.08585 403.15 414.63 0.97 0.05517 0.00121 0.51669 0.01098 0.06793 0.00081 419 27 423 7 424 5 HL-6TW-10 23.93572 217.65 284.42 0.77 0.05564 0.00147 0.51453 0.01309 0.06707 0.00086 438 34 421 9 418 5 HL-6TW-11 182.96866 174.88 278.25 0.63 0.1638 0.00173 11.37392 0.12032 0.50359 0.00509 2495 8 2554 10 2629 22 HL-6TW-12 62.72011 631.34 705.88 0.89 0.05786 0.00079 0.54457 0.00726 0.06826 0.00071 524 14 441 5 426 4 HL-6TW-13 55.57702 288.19 696.72 0.41 0.05587 0.00079 0.52193 0.00724 0.06774 0.00071 447 14 426 5 423 4 HL-6TW-14 165.63799 161.21 275.45 0.59 0.16075 0.0017 10.18184 0.10693 0.45935 0.0046 2464 8 2451 10 2437 20 HL-6TW-15 310.96888 384.68 728.38 0.53 0.11283 0.00119 5.30526 0.05522 0.34099 0.00339 1845 8 1870 9 1891 16 HL-6TW-16 39.85422 376.9 453.41 0.83 0.05416 0.00099 0.51043 0.00902 0.06835 0.00075 378 21 419 6 426 5 HL-6TW-17 211.66882 226.43 337.64 0.67 0.16119 0.00171 10.43269 0.10897 0.46937 0.00468 2468 8 2474 10 2481 21 HL-6TW-18 16.15166 103.65 303.07 0.34 0.05164 0.0008 0.32983 0.00499 0.04632 0.00049 270 17 289 4 292 3 HL-6TW-19 187.78596 159.58 304.43 0.52 0.16261 0.00173 10.62133 0.11093 0.47367 0.00471 2483 8 2491 10 2500 21 HL-6TW-20 108.37869 203.95 246.97 0.83 0.11053 0.00119 4.93986 0.05231 0.3241 0.00322 1808 9 1809 9 1810 16 HL-6TW-21 44.88306 409.05 692.03 0.59 0.05358 0.00067 0.40163 0.00491 0.05436 0.00055 353 12 343 4 341 3 HL-6TW-22 310.28845 337.12 755.5 0.45 0.11184 0.00118 5.06654 0.05228 0.32852 0.00323 1830 8 1831 9 1831 16 HL-6TW-23 146.74297 143.78 235.26 0.61 0.16204 0.00178 10.43984 0.11226 0.46722 0.0047 2477 8 2475 10 2471 21 HL-6TW-24 37.47048 55.45 52.13 1.06 0.16889 0.00267 11.3314 0.17715 0.48654 0.00624 2547 12 2551 15 2556 27 HL-6TW-25 21.74959 93.65 206.22 0.45 0.05832 0.00219 0.6729 0.02423 0.08367 0.00131 542 51 522 15 518 8 HL-6TW-26 74.78277 136.35 946.08 0.14 0.05948 0.00126 0.56493 0.01149 0.06887 0.0008 585 25 455 7 429 5 HL-6TW-27 391.93267 818.2 964.51 0.85 0.10909 0.00314 4.28408 0.11341 0.28483 0.0032 1784 54 1690 22 1616 16 HL-6TW-28 106.79042 553.84 1308.16 0.42 0.05518 0.00072 0.5136 0.00647 0.06749 0.00068 420 13 421 4 421 4 
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表 2 辉绿岩主量（%）、微量、稀土元素（10−6）分析结果
Table 2. Analysis results of major (%), trace and rare earth elements (10−6) in diabase
样品编号 PM101-8DH1 HL-1DH HL-2DH HL-3DH HL-4DH HL-5DH HL-6DH HL-7DH HL-8DH SiO2 47.23 50.18 47.43 47.77 47.83 49.8 46.73 47.61 48.03 TiO2 1.74 2.35 2.92 1.75 2.61 3.14 3.08 2.78 3.24 Al2O3 14.05 12.55 13 14.58 12.74 12.71 13.62 12.91 12.67 TFe2O3 12.39 11.94 16 12.54 16.42 14.96 14.58 14.31 15.44 MnO 0.19 0.17 0.23 0.19 0.25 0.22 0.23 0.19 0.18 MgO 6.82 6.43 5.27 7.14 6.42 4.26 6.24 5.41 4.96 CaO 10.74 6.28 9.65 10.95 6.38 7.41 8.89 10.29 8.12 Na2O 2.85 2.92 2.48 2.13 2.16 3.32 3.36 2.34 3.36 K2O 0.84 1.68 0.74 1.03 1.34 1.88 0.57 0.91 0.78 P2O5 0.19 0.26 0.37 0.21 0.48 0.41 0.51 0.39 0.39 LOI 2.62 5.24 1.04 1.90 3.40 2.37 1.34 1.55 2.02 TOTAL 99.66 100.00 99.13 100.19 100.03 100.48 99.15 98.69 99.19 Li 152.08 32.90 13.96 15.52 16.50 16.87 11.19 15.47 19.67 La 12.17 41.35 24.14 29.61 25.13 25.82 58.22 31.32 38.15 Ce 30.71 86.05 55.85 59.05 56.72 57.85 118.80 69.17 82.33 Pr 4.23 10.34 7.37 6.58 7.32 7.46 13.83 8.85 10.36 Nd 18.86 41.38 32.48 25.23 33.36 32.56 54.64 38.27 43.26 Sm 4.66 7.63 7.62 4.92 7.48 7.21 11.12 8.52 10.08 Eu 1.61 2.42 2.71 1.74 2.74 2.65 2.72 2.69 2.83 Gd 5.05 6.89 8.64 5.63 8.72 6.98 11.31 9.32 10.77 Tb 0.81 0.92 1.37 0.82 1.44 1.02 1.80 1.35 1.61 Dy 5.06 5.18 8.39 4.85 9.15 5.89 11.09 8.18 9.63 Ho 1.01 0.93 1.69 0.99 1.91 1.09 2.19 1.60 1.96 Er 2.98 2.34 4.71 2.68 5.59 2.97 6.30 4.50 5.58 Tm 0.41 0.34 0.63 0.41 0.78 0.38 0.91 0.65 0.80 Yb 2.51 2.07 4.47 2.38 5.40 2.56 5.78 4.16 5.09 Lu 0.42 0.31 0.66 0.37 0.80 0.37 0.90 0.57 0.72 Y 24.13 21.81 39.84 22.71 44.86 25.52 52.55 37.72 46.94 ΣREE 90.50 208.14 160.73 145.26 166.55 154.79 299.62 189.12 223.17 LREE 72.24 189.17 130.17 127.13 132.76 133.53 259.33 158.81 187.01 HREE 18.26 18.98 30.56 18.12 33.79 21.26 40.29 30.32 36.17 LREE/HREE 3.96 9.97 4.26 7.01 3.93 6.28 6.44 5.24 5.17 （La/Yb）N 3.47 14.32 3.87 8.92 3.34 7.24 7.23 5.40 5.37 δEu 1.01 1.00 1.02 1.01 1.03 1.13 0.73 0.92 0.82 δCe 1.05 0.99 1.02 0.99 1.01 1.01 0.99 1.00 1.00 Li 22.00 32.90 13.96 15.52 16.50 16.87 11.19 15.47 19.67 Be 0.41 1.49 1.23 0.72 0.81 0.65 2.63 1.36 1.82 Sc 38.43 27.63 32.97 29.00 43.05 26.13 31.54 35.58 28.96 V 295.10 273.13 406.23 271.99 340.19 295.18 341.59 366.63 400.37 Cr 200.39 271.56 43.62 136.57 91.70 97.13 54.23 76.02 43.80 Co 46.54 38.07 47.23 46.41 45.36 45.63 39.10 49.82 42.65 Ni 83.00 99.09 37.80 78.60 32.96 73.97 37.72 55.17 46.57 Cu 74.79 76.51 54.46 71.39 53.75 76.30 178.45 117.35 109.22 Zn 80.94 141.15 128.48 87.47 126.17 106.60 390.70 90.71 99.14 Ga 16.54 16.91 21.43 17.71 19.21 18.37 21.03 19.81 21.09 Rb 37.93 76.88 40.82 65.69 57.56 26.73 89.17 31.13 36.87 Sr 227.50 319.73 272.86 489.31 251.63 306.97 339.90 247.93 231.69 Zr 84.48 188.69 175.76 101.50 165.19 141.18 350.64 206.27 258.49 Nb 9.20 20.10 18.70 8.40 17.92 16.74 52.64 26.96 31.24 Mo 0.29 0.46 0.91 0.45 0.54 0.98 2.32 1.33 1.56 Cd 0.08 0.24 0.13 0.14 0.12 0.12 0.35 0.09 0.11 In 0.06 0.10 0.11 0.07 0.12 0.10 0.13 0.11 0.12 Cs 0.49 1.11 0.98 0.40 0.62 0.72 0.46 0.78 0.39 Ba 364.57 931.24 400.22 657.53 512.96 329.56 604.25 326.51 300.15 Hf 2.37 5.37 5.03 2.92 4.99 4.01 9.49 5.82 7.36 Ta 0.69 1.26 1.20 0.55 1.21 1.10 3.56 1.79 2.09 Pb 1.84 39.57 5.02 6.43 4.88 3.19 6.21 4.36 5.84 Bi 0.01 0.06 0.01 0.01 0.02 0.01 0.02 0.01 0.02 Th 1.82 6.15 5.96 7.04 2.82 5.23 9.47 3.60 4.53 U 0.57 1.35 0.93 0.52 0.91 0.74 2.10 1.22 1.34
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