Characteristics and geological significance of Early Carboniferous high-Mg andesites in Ma'anshan area, east Inner Mongolia
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摘要:
内蒙古东部马鞍山地区发育早石炭世高镁安山岩,其LA-ICP-MS锆石U-Pb测年结果为346.4±1.4Ma,指示其形成于早石炭世。马鞍山高镁安山岩属于钙碱性岩石系列,SiO2含量为53.22%~54.22%,MgO为7.21%~10.03%,Al2O2为14.37%~15.94%,CaO为4.81%~5.94%,富Na、贫K(Na2O为3.87%~4.34%、K2O为0.49%~0.93%)、低TFeO/MgO(< 1.5)、高Cr(364×10-6~429×10-6)、Ni(204×10-6~211×10-6)。所有样品均显示轻稀土元素富集,具轻微的负Eu异常,富集大离子亲石元素Rb、K、Ba、Sr,亏损高场强元素Nb、Zr、Ti、Y、Yb、Lu等,地球化学特征与赞岐岩相似。由此可知,马鞍山地区早白垩世高镁安山岩是由地幔橄榄岩与消减洋壳板片部分熔融产生的富Si质熔体平衡反应的产物,暗示其形成于与俯冲消减有关的构造背景,是古亚洲洋闭合过程中洋陆转化的产物。
Abstract:The Early Carboniferous high-Mg andesites in Ma'anshan area of eastern Inner Mongolia have LA-ICP-MS zircon U-Pb age of 346.4±1.4Ma, indicating that they were formed in Early Carboniferous. Ma'anshan high-Mg andesites belong to calc-alkaline series, with SiO2 53.22%-54.22%, MgO 7.21%-10.03%, Al2O3 14.37%-15.94%, CaO 4.81%-5.94%, rich Na, poor K (Na2O 3.87%-4.34%, K2O 0.49%-0.93%), low TFeO/MgO(< 1.5), high Cr(364×10-6-429×10-6), and Ni (204×10-6-211×10-6). Similar to sanukite, all samples show enrichment of LREE and LILE (e.g., Rb, Ba, Sr and K), slight Eu negative anomaly and depletion of HFSE such as Nb, Zr, Ti, Y, Yb and Lu. They are equilibrium products of Sirich melt derived from partial melting of mantle peridotite and subducted oceanic crust, indicating a subduction background and suggesting that they were formed by ocean-continent transformation during the Palaeo-Asian Ocean closure.
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Key words:
- high-Mg andesites /
- sanukitie /
- zircon U-Pb age /
- geochemistry /
- Ma'anshan
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图 1 大兴安岭北段大地构造位置[12]
Figure 1.
图 8 马鞍山高镁安山岩的SiO2-MgO和SiO2-TFeO/MgO图解(底图据参考文献[31])
Figure 8.
图 9 高镁安山岩分类图(底图据参考文献[32])
Figure 9.
图 10 Nb-Nb/Th和Zr-NbN/ZrN构造环境判别图(底图据参考文献[56])
Figure 10.
表 1 马鞍山高镁安山岩(HP3S1)LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb data of high-Mg andesite(HP3TW9-3)from Ma'anshan area
测点 元素含量/10-6 Th/U 同位素比值 年龄/Ma 谐和度/% Pb Th U 207Pb*/206Pb* ± 1σ 207Pb*/235U ± 1σ 206Pb*/238U ± 1σ 206Pb/238U ± 1σ 207Pb/206Pb ± 1σ 1 71.91 99.93 146.43 0.68 0.1373 0.0023 7.5313 0.1225 0.3984 0.0031 2162 14 2194 34 99 2 152.9 148.73 316.62 0.47 0.1389 0.0015 7.9035 0.1077 0.4124 0.0039 2226 18 2214 18 99 3 8.94 79.09 120.07 0.66 0.0582 0.0019 0.5071 0.0157 0.0636 0.0007 398 4 539 70 95 4 12.04 128.60 161.56 0.80 0.0562 0.0018 0.4820 0.0159 0.0625 0.0007 391 4 457 70 97 5 19.33 171.73 304.96 0.56 0.0553 0.0017 0.4224 0.0135 0.0553 0.0005 347 3 433 73 97 6 12.87 298.43 424.52 0.70 0.0494 0.0017 0.1769 0.0063 0.0260 0.0003 165 2 165 86 99 7 22.07 347.71 312.01 1.11 0.0530 0.0015 0.4085 0.0125 0.0557 0.0006 350 4 328 63 99 8 17.40 127.72 212.38 0.60 0.0583 0.0019 0.5669 0.0198 0.0705 0.0008 439 5 543 74 96 9 19.28 237.39 285.84 0.83 0.0567 0.0017 0.4302 0.0121 0.0555 0.0006 348 4 480 65 95 10 21.46 271.99 318.28 0.85 0.0533 0.0014 0.4077 0.0114 0.0555 0.0006 348 3 343 94 99 11 85.10 78.82 241.55 0.33 0.1105 0.0013 4.8247 0.0702 0.3163 0.0032 1772 16 1809 21 99 12 53.45 588.49 725.05 0.81 0.0579 0.0013 0.4829 0.0112 0.0604 0.0005 378 3 524 50 94 13 39.39 283.38 656.10 0.43 0.0543 0.0010 0.4076 0.0078 0.0544 0.0005 342 3 383 45 98 14 10.99 94.71 153.83 0.62 0.0559 0.0022 0.4721 0.0173 0.0615 0.0007 385 4 450 119 97 15 10.24 261.63 334.77 0.78 0.0526 0.0020 0.1855 0.0072 0.0256 0.0003 163 2 309 87 94 16 31.25 255.46 515.54 0.50 0.0560 0.0013 0.4213 0.0105 0.0546 0.0007 343 4 454 18 95 18 11.64 141.38 173.09 0.82 0.0545 0.0025 0.4116 0.0185 0.0552 0.0007 346 4 391 108 98 19 44.30 272.45 523.40 0.52 0.0565 0.0010 0.5854 0.0109 0.0750 0.0007 466 4 472 44 99 20 14.31 624.41 539.38 1.16 0.0523 0.0017 0.1415 0.0041 0.0198 0.0002 126 2 298 69 93 注:表中测点编号前省略了“HP3” 表 2 马鞍山地区高镁安山岩主量、微量与稀土元素化学成分
Table 2. Chemical compositions of the high-Mg andesites from Ma'anshan area
样品 HP3S1 SK01 SK02 SK03 SK04 SiO2 53.22 54.22 53.35 54.1 53.43 TiO2 0.75 0.75 0.76 0.74 0.75 Al2O3 15.94 15.27 15.25 15.27 14.37 Fe2O3 1.62 1.45 1.68 1.64 1.87 FeO 5 5.19 5.18 5.28 4.99 MnO 0.13 0.17 0.17 0.18 0.14 MgO 8.68 8.62 7.95 7.21 10.03 CaO 5.94 4.81 5.94 5.16 5.78 Na2O 4.34 4.33 4.27 4.12 3.87 K2O 0.81 0.49 0.68 0.66 0.93 P2O5 0.22 0.23 0.23 0.22 0.2 烧失量 3.17 2.67 3.19 2.88 3.46 总计 99.82 99.89 99.88 99.89 99.81 Mg# 0.72 0.72 0.7 0.68 0.74 Li 29.3 18.25 21.47 27.01 32.13 Be 0.91 0.91 0.91 0.77 0.81 Sc 21.6 21.33 26.92 28.93 25.75 V 145 169.7 164.8 154 162.2 Cr 369 364 365 370 428.8 Co 30.4 34.89 29.13 34.6 35.2 Ni 204 203.49 210.7 210.52 207.81 Ga 18.3 20.15 19.62 17.9 17.35 Rb 13.7 13.39 13.64 9.97 13.77 Sr 336 336.5 335 346.7 327.7 Nb 3.01 2.88 2.78 2.85 2.79 Cs 1.28 1.3 1.62 1.22 0.94 Ba 317 337.84 308.78 277.28 330.05 Hf 2.63 2.65 3.1 2.64 2.9 Ta 0.34 0.17 0.17 0.14 0.17 Pb 0.22 5 3.99 4.08 3.71 Th 2.08 1.99 1.9 1.85 1.86 U 0.54 0.44 0.5 0.42 0.48 Zr 89.4 91.12 92.78 83.37 104.5 Sr/Y 23.33 23.16 23.37 28.64 25.65 La 12.9 11.75 11.92 11.65 11.62 Ce 27.5 26.89 26.35 27.36 25.47 Pr 3.87 3.82 3.13 3.64 3.49 Nd 17.1 15.83 15.08 15.11 14.74 Sm 3.41 3.7 3.03 3.44 2.95 Eu 1.06 1.02 1.03 1.01 0.91 Gd 2.95 2.52 2.86 2.37 2.48 Tb 0.47 0.47 0.43 0.44 0.39 Dy 2.54 2.36 2.78 2.18 2.23 Ho 0.49 0.44 0.44 0.43 0.42 Er 1.37 1.44 1.33 1.35 1.19 Tm 0.21 0.23 0.21 0.22 0.21 Yb 1.28 1.27 1.27 1.28 1.26 Lu 0.21 0.2 0.21 0.2 0.19 Y 14.4 14.53 14.34 12.11 12.78 ΣREE 75.36 71.94 70.06 70.69 67.52 LREE/ HREE 6.92 7.05 6.36 7.34 7.08 LaN/YN 7.23 6.62 6.74 6.53 6.64 δEu 1 0.97 1.05 1.02 1 Ba/Th 152 169 162 149 177 Th/Yb 1.63 1.56 1.5 1.45 1.49 La/Sm 3.78 3.18 3.93 3.39 3.94 注:Mg#=100×Mg/(Mg+Fe2+);主量元素含量单位为%,微量和稀土元素单位为10-6 表 3 典型高镁安山岩的主量、微量和稀土元素成分对比
Table 3. Major elements, trace elements and REE data for several typical high-Mg andesites
地区 Kamchatka
海峡墨西哥
Baja地区Setouchi
火山岩带日本
Bonin岛内蒙古
马鞍山地区岩石类型 埃达克型HMA 巴哈岩 赞岐岩 玻安岩 高镁安山岩 样品个数 5 9 47 31 5 SiO2 60.5~61.4 50.2~59.3 52.9~64.2 54.31~59.69 53.22~54.22 TiO2 0.90~0.98 0.65~3.47 0.39~1.25 0.07~0.29 0.74~0.76 Al2O3 15.7~16.2 13.6~18 14.1~18.5 8.02~14.44 14.37~15.94 TFeO 3.34~3.48 3.91~8.62 3.76~7.42 8.09~9.87 6.62~6.96 MnO 0.04~0.05 0.06~0.14 0.07~0.17 0.13~0.30 0.13~0.18 MgO 4.59~4.86 3.46~10.34 3.16~11.76 8.77~16.78 7.21~10.03 CaO 7.01~7.73 5.82~10.01 4.69~8.35 6.66~9.98 4.81~5.94 Na2O 3.59~3.76 2.83~5.35 2.20~4.11 0.76~2.27 3.87~4.34 K2O 2.12~2.43 0.71~4.24 0.92~2.60 0.24~0.72 0.49~0.93 P2O5 0.39~0.45 0.17~1.34 0.09~0.27 0.01~0.08 0.20~0.23 Na2O/K2O 1.63~1.77 1.8~5.5 1.09~2.75 1.43~4.83 4.18~8.92 Mg# 73~74 49~77 61~79 67~75 68~74 TFeO/MgO 0.71~0.76 0.60~1.83 0.56~1.15 0.58~0.91 0.68~0.96 Cr 161~184 43~490 332~752 600~1150 364~429 Ni 119~133 36~280 126~312 100~320 203~211 Rb 13~30 3.5~39 45~121 0.5~12 9.64~13.77 Sr 2302~2529 506~3800 245~331 61~97 328~347 Y - 5~23 11~18 2~5 12.11~14.53 Zr 63~470 - 68~119 11~25 83.37~104.48 Ba 280~2300 93~101 195~336 20~30 177~330 La 21.7~84 6.5~7.16 8.65~18.1 0.82~1.27 11.62~12.90 Yb 0.51~1.67 1.40~1.58 1.34~1.88 0.48~0.66 1.26~1.28 Sr/Y 45~506 20~21 15~28 12~29 23.16~28.64 La/Yb 15~48 4~5 5.14~10.13 1.43~2.15 9.10~10.07 注:HMA为高镁安山岩;Mg#=(100×Mg/(Mg+Fe2+)),氧化物为去水后标准化数据。数据来源:阿留申西部Kamchatka海峡的埃达克型高镁安山岩[3];墨西哥加利福尼亚Baja地区的巴哈岩[23];日本西南Setouchi火山岩带赞岐岩[18-20];日本Bonin岛玻安岩[21-24];主量元素含量单位为10%,微量和稀土元素为10-6 -
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