Superposition of Paleo-Asian and West-Pacific Tectonic Domains in the Eastern Section of the Solonker Suture Zone: Insights from Petrology, Geochemistry and Geochronology of Deformed Diorite in Xar Moron Fault Zone, Inner Mongolia
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摘要: 在内蒙古林西县西拉木伦断裂带内发育岩株状产出并具有不同程度变形特征的闪长岩体, 岩体侵入到双井片岩中.对该闪长岩进行了岩石学、地球化学、锆石LA-ICPMS U-Pb年龄和角闪石40Ar-39Ar年龄的研究.结果表明内蒙古林西县西拉木伦断裂带内的变形闪长岩侵位于早二叠世, 其锆石LA-ICPMS U-Pb年龄为286±1 Ma.岩浆来源于俯冲带流体/熔体交代作用而形成的富集地幔.岩石遭受了早侏罗世绿帘角闪岩相变质作用, 角闪石40Ar-39Ar年龄为188.7±1.4 Ma.结合研究区及邻区近年来的新成果认为索伦缝合带早古生代以来的镁铁质岩石均显示来源于相对富集LILE、LREE的地幔, 与俯冲流体或熔体的改造作用相关, 并且随着时代的更新改造程度显示增强的趋势.索伦缝合带在晚石炭世(~310 Ma)之前发生过闭合碰撞, 晚石炭世-早二叠世(~310~276 Ma)处于后造山伸展的背景, 在伸展环境下形成了华北北缘该时期广泛分布的闪长岩-花岗闪长岩带, 报道的闪长岩即为该时期的产物.晚二叠世缝合带局部区域存在洋盆, 洋盆的闭合导致了晚二叠世-中三叠世(~272~230 Ma)索伦缝合带的最终碰撞缝合, 最终碰撞缝合在空间上的不均一性形成了缝合带内该时期大量并存的同碰撞花岗岩和后碰撞花岗岩.索伦缝合带的缝合导致华北板块与其北部各微陆块的拼合, 此时蒙古-鄂霍次克海作为古太平洋的一个分支北东向展布于西伯利亚板块和拼合后的华北板块之间.早侏罗世蒙古-鄂霍次克海在蒙古东北部发生闭合, 本文报道的角闪石40Ar-39Ar年龄记录了洋壳闭合后陆-陆碰撞的变质时间, 之后研究区进入后造山伸展的环境.此时在古太平洋板块向华北板块俯冲应力的共同作用下, 华北东部在侏罗纪出现挤压机制与拉张机制的多次转换.晚侏罗世古太平洋板块俯冲方向转变后, 中国东部进入持续的拉张背景, 并转入西太平洋构造域的范畴.Abstract: Some diorite stocks developed in the Xar Moron fault belt in Linxi county, Inner Mongolia. They intruded into the Shuangjing schist and display variable degrees of deformation. This study presents the petrology, geochemistry, a LA-ICPMS U-Pb zircon age and a hornblende 40Ar-39Ar age of the diorite. The diorite was emplaced in the Early Permian, as reflected by a LA-ICPMS U-Pb zircon age of 286±1 Ma. The magma is derived from enriched mantle metasomatized by slab-derived fluids or melts. The diorites were subject to epidote-amphibolite facies metamorphism during the Early Jurassic, resulting in a hornblende 40Ar-39Ar age of 188.7±1.4 Ma. Combining the new data with the latest published results from the study area and the region, we conclude that the Early Paleozoic and younger mafic rocks in the Solonker suture zone are derived from mantle that was metasomatized by subducted sediments, and that metasomatism increased with time. A stage of collision occurred before the Late Carboniferous (~310 Ma) and the Solonker suture zone underwent post-orogenic extension during the Late Carboniferous to Early Permian (~310 to 276 Ma). The diorite studied is part of a widespread diorite-granodiorite suite that formed during this period of extension in the suture zone. In the Late Permian oceanic basins occurred locally in the suture zone. The closure of these basins induced the final collision of the Solonker suture during the Late Permian to Middle Triassic (~272 to 230 Ma). Spatial variation in the timing of final collision led to the coeval formation of syn-collisional and post-collisional granites in the suture zone. Closure of the Solonker suture zone resulted in the amalgamation of the North China Craton with some microcontinents to its north. North of the accreted microcontinents, the Mongol-Okhotsk Ocean, a branch of the Paleo-Pacific Ocean, formed the remaining NE-striking oceanic domain between the Siberia Craton to the north and the North China Craton to the south. The closure of the Mongol-Okhotsk Ocean in NE Mongolia in the Early Jurassic induced the continent-continent collision recorded by the hornblende 40Ar-39Ar age from the Solonker diorite. The research area then entered post-orogenic extension, while further east the Paleo-Pacific plate subducted beneath the North China Craton. The combination of regional post-orogenic extension and distant subduction led to alternating compression and extension in the Jurassic in what is now northeastern China. After the change in the subduction direction of the Paleo-Pacific plate in the Late Jurassic, the tectonic environment in northeastern China finally became extensional and the region entered the West-Pacific tectonic domain.
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图 1 内蒙古中部构造格局略图(据Xiao et al., 2003)
Fig. 1. Structure delineation of central Inner Mongolia
图 2 内蒙古林西县双井地区地质简图
1.双井片岩；2.花岗质片麻岩；3.志留系西别河组；4.杏树洼蛇绿岩；5.二叠系哲斯组；6.中生代侵位岩；7.中生代火山岩；8.第三系玄武岩；9.第四系；10.断层；11.村庄；12.采样点.据中国地质大学(武汉)地质调查院，2008.内蒙古1∶25万林西县幅区域地质调查报告
Fig. 2. Geological map of Shuangjing area in Linxi County, Inner-Mongolia
图 4 闪长岩中角闪石Ti-Si图解(a)和AlⅣ-AlⅥ图解(b)
a.引自Leake(1978)；b.转引自宋明春(1998)
Fig. 4. Ti-Si diagram (a) and AlⅣ-AlⅥ diagram (b) of amphibole from diorite
图 5 闪长岩及研究区类似岩石的微量元素蛛网图(a)和稀土元素配分模式图(b) (标准值采用Sun and McDonough (1989)推荐值)
Fig. 5. Primitive-mantle normalized trace elements distribution patterns (a) and Chondrite normalized REE distribution patterns (b) of diorite and similar rocks in research area
图 6 闪长岩单颗粒锆石CL图像(a)和LA-ICPMS锆石U-Pb谐和图(b)
圆圈表示剥蚀激光束对应的位置，直径为32 μm
Fig. 6. Representative CL images (a) and LA-ICPMS U-Pb Concordia diagram (b) of zircons from diorite
图 7 闪长岩中角闪石40Ar-39Ar年龄谱(a)与反等时线(b)
Fig. 7. Apparent age spectrum (a) and inverse isochron line (b) of amphibole from diorite
图 8 闪长岩中Ba/Nb-La/Nb相关图解
MORB，OIB，原始地幔采用Sun and McDonough(1989)推荐值
Fig. 8. Ba/Nb-La/Nb diagram of diorite
图 9 晚二叠世中国东北部及邻区洋-陆构造格局复原图(据Li, 2006)
Fig. 9. Palinspastic reconstruction of Late Permian ocean-continent framework of northeastern China and adjacent regions
表 1 闪长岩中斜长石的电子探针分析结果(%)及相关参数
Table 1. Electronic probe analyzing results (%) of plagioclase from diorite and related parmeters
样号 点位 SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O Cr2O3 ∑ An Ab Or 种属 8130 小
莲
花
山68.65 0.00 20.01 0.00 0.00 0.00 0.83 10.39 0.16 0.00 100.04 4 95 1 钠
长
石69.48 0.00 20.58 0.00 0.02 0.01 0.90 10.39 0.18 0.00 101.56 5 94 1 70.76 0.00 19.78 0.05 0.00 0.00 0.03 9.47 0.13 0.00 100.22 0 99 1 69.61 0.00 20.50 0.00 0.00 0.00 0.84 10.35 0.18 0.00 101.48 4 95 1 69.69 0.00 20.34 0.00 0.00 0.00 0.80 10.37 0.07 0.00 101.27 4 96 0 70.48 0.00 20.32 0.00 0.00 0.00 0.61 10.59 0.09 0.00 102.09 3 96 1 70.48 0.00 20.69 0.00 0.00 0.00 0.83 10.37 0.05 0.00 102.42 4 95 0 66.73 0.00 19.64 0.00 0.00 0.00 0.76 9.58 0.08 0.00 96.79 4 95 1 68.88 0.00 19.82 0.00 0.00 0.00 0.77 10.11 0.08 0.00 99.66 4 95 0 69.77 0.00 20.16 0.00 0.00 0.00 0.72 9.97 0.13 0.00 100.75 4 95 1 
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表 2 闪长岩中角闪石的电子探针分析结果(%)及相关参数
Table 2. Electronic probe analyzing results (%) of amphibole from diorite and related parmeters
样号 点位 SiO2 TiO2 Al2O3 FeO* MnO MgO CaO Na2O K2O Cr2O3 ∑ Ca2+ Na+ AlⅣ AlⅥ 种属 8130 小
莲
花
山49.91 0.58 4.04 14.54 0.55 12.87 11.70 0.73 0.22 0.00 95.14 1.87 0.21 0.47 0.24 钙
质
闪
石50.80 0.36 4.00 14.67 0.47 13.74 11.68 0.62 0.19 0.00 96.52 1.83 0.18 0.53 0.15 49.16 0.50 4.41 15.92 0.46 12.56 11.70 0.74 0.20 0.00 95.66 1.87 0.21 0.61 0.16 50.93 0.37 3.79 15.42 0.41 13.48 11.86 0.71 0.19 0.00 97.17 1.86 0.20 0.52 0.13 50.81 0.21 3.69 15.33 0.41 13.56 11.46 0.66 0.20 0.00 96.33 1.80 0.19 0.53 0.11
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表 3 闪长岩及研究区相似岩石的微量元素分析结果(10-6)
Table 3. Compositions of trace elements of the diorite and similar rocks in research area
元素 8130 DSZ1 DSZ2 BBT1 BBT2 ADAK DYKE Sc 29.1 29.3 30.0 28.2 11.4 12.1 13.7 V 160 218 225 302 71.50 101 137 Cr 51.4 218 225 56.9 48.3 115 35.4 Co 23.0 102 105 31.5 11.3 37.3 19.7 Ni 21.2 102 105 27.2 16.0 63.4 11.5 Ga 16.3 23.1 20.1 18.6 20.6 Rb 20.6 4.42 4.06 9.8 111 64.6 77.0 Sr 136 296 275 455 175 836 624 Y 44.3 30.0 30.6 29.6 46.1 14.2 20.4 Zr 70.2 167 171 206 559 142 246 Nb 4.96 6.25 6.16 1.50 6.35 3.82 12.7 Cs 0.64 1.14 1.04 1.57 3.36 Ba 387 89.7 83.1 54.7 303 507 1831 La 12.0 14.5 14.8 6.24 14.5 17.0 40.5 Ce 33.8 34.7 34.4 15.9 35.8 39.1 84.2 Pr 4.45 4.99 4.87 2.77 4.61 4.54 10.9 Nd 23.0 23.2 22.3 14.3 20.9 18.4 42.7 Sm 6.44 5.37 5.18 4.11 5.54 3.69 7.64 Eu 1.32 1.97 1.87 1.42 0.90 1.00 2.12 Gd 6.21 5.70 5.48 4.50 6.25 3.06 5.74 Tb 1.14 0.89 0.86 0.87 1.23 0.44 0.79 Dy 7.88 5.25 5.06 5.54 8.12 2.53 4.14 Ho 1.64 1.10 1.06 1.16 1.71 0.50 0.73 Er 4.18 3.00 2.90 3.40 5.22 1.45 1.92 Tm 0.65 0.44 0.42 0.54 0.84 0.21 0.27 Yb 4.31 2.64 2.55 3.56 5.61 1.29 1.59 Lu 0.56 0.38 0.36 0.53 0.84 0.20 0.24 Hf 2.14 3.94 4.02 6.54 16.75 3.75 5.85 Ta 0.31 0.42 0.41 0.10 0.48 0.39 0.86 Pb 7.14 3.33 3.12 2.36 10.5 16.4 117 Th 2.44 0.87 0.89 0.71 8.63 4.30 4.25 U 0.61 0.33 0.31 1.15 2.34 1.43 1.14 (La/Yb)N 2.00 3.94 4.17 1.26 1.85 9.44 18.31 (La/Gd)N 1.68 2.21 2.34 1.20 2.00 4.81 6.12 (Dy/Yb)N 1.22 1.33 1.33 1.04 0.97 1.32 1.75 时代 286 Ma 439 Ma 439 Ma 313~308 Ma 313~308 Ma 244 Ma 132 Ma 注：DSZ1与DSZ2为大石寨组两类玄武岩，郭锋等(2009)；BBT1与BBT2分别为本巴图组双峰式火山岩中的玄武岩和英安岩，汤文豪等(2010)；ADAK为林西地区埃达克岩，王冬兵等(2009)；DYKE为林西地区中性岩墙群，李益龙等(2010)；8130为本文样品；引用的数值均为各作者报道数值的平均值.
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表 4 闪长岩(8130)的LA-ICPMS锆石U-Pb分析结果
Table 4. LA-ICPMS zircon U-Pb analytic data for diorite (No.8130)
样品号 组成(10-6) Th/U 同位素比值 年龄(Ma) Pb Th U 207Pb/206Pb 1s 207Pb/235U 1s 206Pb/238U 1s 208Pb/232Th 1s 207Pb/206Pb 1s 207Pb/235U 1s 206Pb/238U 1s 208Pb/232Th 1s 8130-1 5.26 45.19 88.31 0.51 0.085 87 0.001 54 0.538 59 0.009 89 0.045 49 0.000 56 0.022 72 0.000 29 264 23 279 5 281 3 295 4 8130-2 16.58 273.92 262.34 1.04 0.059 04 0.000 90 0.370 27 0.005 93 0.045 48 0.000 55 0.015 72 0.000 17 311 115 284 12 281 4 281 3 8130-3 8.43 115.34 147.69 0.78 0.051 55 0.001 09 0.318 07 0.006 84 0.044 75 0.000 56 0.014 50 0.000 19 266 27 280 5 282 3 291 4 8130-4 8.05 69.55 126.95 0.55 0.103 49 0.001 74 0.654 23 0.011 37 0.045 85 0.000 57 0.025 78 0.000 32 270 22 282 5 283 3 309 4 8130-5 9.51 92.76 140.25 0.66 0.120 31 0.001 90 0.759 30 0.012 45 0.045 77 0.000 56 0.026 93 0.000 32 526 20 311 5 283 3 308 4 8130-6 3.54 34.98 61.22 0.57 0.064 94 0.001 30 0.409 36 0.008 34 0.045 72 0.000 57 0.018 07 0.000 24 2 099 16 599 8 283 4 536 7 8130-7 4.71 48.23 83.16 0.58 0.061 59 0.001 16 0.384 13 0.007 46 0.045 23 0.000 56 0.016 77 0.000 22 306 23 286 5 283 3 282 4 8130-8 6.33 80.40 110.20 0.73 0.051 66 0.000 94 0.319 89 0.006 03 0.044 91 0.000 55 0.015 43 0.000 19 401 31 296 6 283 4 301 5 8130-9 7.73 103.45 135.20 0.77 0.051 51 0.000 95 0.316 51 0.006 06 0.044 56 0.000 55 0.014 70 0.000 18 600 27 321 6 284 4 340 5 8130-10 3.27 29.86 59.15 0.50 0.059 91 0.001 33 0.371 83 0.008 36 0.045 01 0.000 57 0.016 97 0.000 25 660 22 330 5 285 3 336 4 8130-11 8.73 101.17 133.63 0.76 0.093 20 0.001 55 0.588 11 0.010 15 0.045 76 0.000 57 0.021 24 0.000 26 274 20 284 4 285 3 318 4 8130-12 11.53 148.94 195.58 0.76 0.051 75 0.000 86 0.323 08 0.005 61 0.045 28 0.000 55 0.015 88 0.000 19 335 33 291 6 285 4 297 5 8130-13 11.62 175.88 190.27 0.92 0.057 90 0.001 02 0.358 88 0.006 57 0.044 95 0.000 55 0.015 35 0.000 19 1 330 15 435 6 286 3 383 5 8130-14 5.08 38.62 93.17 0.41 0.055 20 0.001 03 0.348 23 0.006 69 0.045 75 0.000 57 0.016 62 0.000 23 1 707 15 512 7 286 3 570 7 8130-15 3.51 41.62 60.76 0.68 0.050 90 0.001 22 0.321 51 0.007 81 0.045 81 0.000 59 0.015 04 0.000 22 276 27 285 5 286 4 288 4 8130-16 7.99 105.92 127.82 0.83 0.062 38 0.001 10 0.393 19 0.007 17 0.045 71 0.000 56 0.017 43 0.000 22 1 107 27 397 8 286 4 407 7 8130-17 13.02 191.23 192.32 0.99 0.085 62 0.001 31 0.534 86 0.008 67 0.045 30 0.000 55 0.019 11 0.000 23 1 335 18 437 7 287 3 454 6 8130-18 7.92 57.27 125.97 0.45 0.104 60 0.001 66 0.655 23 0.010 93 0.045 43 0.000 56 0.028 61 0.000 37 327 31 292 6 287 4 300 5 8130-19 5.52 65.49 92.87 0.71 0.052 58 0.002 59 0.323 28 0.015 31 0.044 59 0.000 61 0.013 99 0.000 15 1 961 14 574 7 288 3 537 6 8130-20 7.09 97.28 119.72 0.81 0.051 78 0.001 07 0.323 52 0.006 87 0.045 31 0.000 57 0.014 35 0.000 20 772 23 348 6 288 4 362 5 8130-21 19.05 355.35 286.75 1.24 0.052 37 0.000 91 0.329 54 0.005 97 0.045 64 0.000 56 0.014 94 0.000 19 1 492 16 470 6 288 4 425 5 8130-22 6.95 56.06 100.83 0.56 0.121 23 0.002 25 0.771 56 0.014 64 0.046 16 0.000 59 0.030 88 0.000 44 420 22 303 5 288 4 333 5 8130-23 8.93 87.83 129.49 0.68 0.130 05 0.002 33 0.803 62 0.014 81 0.044 82 0.000 57 0.026 88 0.000 37 687 20 337 5 288 3 349 4 8130-24 14.34 235.34 232.81 1.01 0.052 47 0.000 98 0.324 91 0.006 26 0.044 91 0.000 56 0.014 06 0.000 19 302 21 289 5 288 3 300 4 8130-25 6.35 78.79 103.55 0.76 0.059 27 0.001 30 0.373 43 0.008 34 0.045 70 0.000 59 0.016 61 0.000 25 577 27 322 6 288 4 333 5 8130-26 4.33 42.53 70.53 0.60 0.076 46 0.001 81 0.477 85 0.011 41 0.045 32 0.000 60 0.020 33 0.000 33 1 688 16 511 7 289 4 514 6 8130-27 5.89 60.74 103.66 0.59 0.053 14 0.001 30 0.331 54 0.008 23 0.045 25 0.000 59 0.014 78 0.000 25 236 33 283 6 289 4 302 4 8130-28 5.97 75.44 101.21 0.75 0.054 72 0.001 28 0.338 54 0.008 02 0.044 87 0.000 58 0.015 00 0.000 24 1 974 17 581 8 291 4 615 9
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表 5 闪长岩中角闪石激光熔样法40Ar-39Ar测年结果
Table 5. 40Ar/39Ar dationg results of amphibole from diorite
激光输出能量(W) 36Ar(a) 37Ar(Ca) 38Ar(Cl) 39Ar(K) 40Ar(r) 年龄(Ma) ±2δ 40Ar(r)(%) 39Ar(K)(%) K/Ca ±2δ 4.00 0.000 040 0.020 491 0.000 007 0.001 796 0.025 839 238.82 3.81 68.34 3.40 0.049 0.005 5.00 0.000 048 0.033 766 0.000 010 0.002 795 0.031 085 187.40 3.94 68.85 5.28 0.046 0.004 6.00 0.000 084 0.062 494 0.000 017 0.004 982 0.055 101 186.37 3.24 68.92 9.42 0.045 0.004 6.90 0.000 085 0.081 101 0.000 022 0.006 429 0.072 192 189.09 2.41 74.06 12.15 0.044 0.004 7.80 0.000 106 0.101 005 0.000 029 0.008 082 0.091 066 189.70 2.55 74.42 15.28 0.045 0.004 8.60 0.000 087 0.101 405 0.000 028 0.007 584 0.083 842 186.31 2.32 76.49 14.34 0.042 0.004 9.40 0.000 067 0.086 576 0.000 024 0.006 153 0.068 843 188.43 2.43 77.73 11.63 0.040 0.004 10.40 0.000 044 0.063 554 0.000 018 0.004 963 0.056 349 191.08 2.34 81.14 9.38 0.044 0.004 11.60 0.000 036 0.065 804 0.000 019 0.004 740 0.053 873 191.25 2.67 83.41 8.96 0.040 0.004 13.60 0.000 021 0.050 571 0.000 014 0.003 250 0.036 650 189.87 2.97 85.31 6.14 0.036 0.003 17.00 0.000 005 0.009 958 0.000 003 0.000 609 0.006 682 184.99 7.14 80.49 1.15 0.034 0.003 25.00 0.000 014 0.023 788 0.000 006 0.001 508 0.016 506 184.58 4.16 80.45 2.85 0.035 0.003 8130，角闪石，坪年龄＝188.7±1.4 Ma，J-value＝0.009 840 5 ± 0.000 014 8，全气体年龄＝190.3±1.0 Ma
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