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川西拉拉含矿镁铁质层状岩体的成因及构造背景

孙君一 于文佳 崔加伟 李重 罗照华

孙君一, 于文佳, 崔加伟, 等, 2019. 川西拉拉含矿镁铁质层状岩体的成因及构造背景. 地质力学学报, 25 (1): 139-150. DOI: 10.12090/j.issn.1006-6616.2019.25.01.013
引用本文: 孙君一, 于文佳, 崔加伟, 等, 2019. 川西拉拉含矿镁铁质层状岩体的成因及构造背景. 地质力学学报, 25 (1): 139-150. DOI: 10.12090/j.issn.1006-6616.2019.25.01.013
SUN Junyi, YU Wenjia, CUI Jiawei, et al., 2019. THE PETROGENESIS AND TECTONIC SETTING OF THE ORE-BEARING MAFIC LAYERED INTRUSIONS IN LALA AREA, WESTERN SICHUAN. Journal of Geomechanics, 25 (1): 139-150. DOI: 10.12090/j.issn.1006-6616.2019.25.01.013
Citation: SUN Junyi, YU Wenjia, CUI Jiawei, et al., 2019. THE PETROGENESIS AND TECTONIC SETTING OF THE ORE-BEARING MAFIC LAYERED INTRUSIONS IN LALA AREA, WESTERN SICHUAN. Journal of Geomechanics, 25 (1): 139-150. DOI: 10.12090/j.issn.1006-6616.2019.25.01.013

川西拉拉含矿镁铁质层状岩体的成因及构造背景

doi: 10.12090/j.issn.1006-6616.2019.25.01.013
基金项目: 

中国地质调查局地质调查项目 1212011220921

中国地质调查局地质调查项目 1221011121266

中国地质调查局地质调查项目 12120113094100

中国地质调查局地质调查项目 1212011121075

详细信息
    作者简介:

    孙君一(1988-), 女, 在读博士, 从事岩石学、矿物学、矿床学研究。E-mail:476015552@qq.com

  • 中图分类号: P588.12

THE PETROGENESIS AND TECTONIC SETTING OF THE ORE-BEARING MAFIC LAYERED INTRUSIONS IN LALA AREA, WESTERN SICHUAN

  • 摘要: 川西拉拉含矿镁铁质层状岩体位于扬子地块西缘,构造环境复杂,关于其成因机制及岩浆源区的问题至今仍缺乏系统的研究。文章针对该岩体七个岩相带,进行了主、微量元素和Sr-Nd同位素分析,结果表明,七个岩相带(YWS-1—YWS-7)是岩浆经历不同的演化过程而形成的。其中,第五相带SiO2含量高(42.95%~44.07%),MgO含量低(1.62%~1.89%),稀土总量明显偏低(295.32×10-6~366.36×10-6),Cr、Ni含量偏低,87Sr/86Sr为0.7391~0.7812,是受到地壳混染所致;其它相带Mg#值高(0.54~0.74),稀土总量偏高(672.53×10-6~986.66×10-6),87Sr/86Sr为0.7087~0.7097,显示岩石圈地幔源区特征。结合区域地质背景分析,认为该层状岩体产生于大陆裂谷构造环境,岩浆来源于岩石圈地幔源区,演化过程中结晶分异和多次脉动作用相伴。这一活动过程与新元古时期扬子板块西缘的超级地幔柱活动有关。

     

  • 图  1  拉拉地区区域地质及采样位置图

    a—华南地区新元古代火山岩和沉积岩分布简图;b—拉拉地区地质简图(据文献[11]修改)

    Figure  1.  Geologic map of the Lala district and locations of the sandstone samples

    图  2  岩体典型露头及显微镜下特征(据文献[10])

    Oxide—Fe-Ti氧化物;Mca—云母;Qtz—石英;Kfs—长石;Px—辉石;Am—角闪石
    a—岩体的地质产状和岩相分带特征;b—带1(YWS-1)、带2(YWS-2)、带3(YWS-3)的手标本特征及它们之间的接触关系;c—带3(YWS-3)和带4(YWS-4)的手标本特征及其接触关系;d—带5(YWS-5)的手标本特征;e—带5(YWS-5)的显微镜正交偏光照片;f—带3(YWS-3)的显微镜正交偏光照片

    Figure  2.  The microphotographs and field photographs of sheet in Lala district (after reference [10])

    图  3  TAS图解(据文献[16])

    Figure  3.  Plot of TAS (after reference [16])

    图  4  Zr/P2O5—TiO2图(据文献[17])

    Figure  4.  Zr/P2O5—TiO2 plot (after reference [17])

    图  5  球粒陨石标准化稀土元素配分图及微量元素原始地幔标准化蛛网图(据文献[21])

    Figure  5.  Chondrite-normalized REE patterns and primitive-mantle normalized spidergram (after reference [21])

    图  6  拉拉镁铁质岩体εNd(t)—(87Sr/86Sr)i图解[24]

    DM—亏损地幔;OIB—洋岛玄武岩;PM岩原始地幔;EMⅠ—Ⅰ型富集地幔;EMⅡ—Ⅱ型富集地幔

    Figure  6.  εNd(t)—(87Sr/86Sr)idiagram of the Lala mafic intrusions[24]

    图  7  拉拉镁铁质岩体(Fe+Mg+Mn)/Ti—Si/Ti、CaO/Al2O3—Mg#、Ni—Mg#相关图解

    Figure  7.  (Fe+Mg+Mn)/Ti—Si/Ti, CaO/Al2O3—Mg#, Ni—Mg# diagrams of the Lala mafic intrusions

    图  8  主量元素和岩体厚度对比图

    Figure  8.  Comparison chart of major elements and rock mass thickness

    图  9  构造判别图(据文献[9])

    WAP—板内玄武岩;CMA—大陆边缘弧;MORB—洋中脊玄武岩;OIA—大洋弧

    Figure  9.  Discrimination diagrams of tectonic formations (after reference [9])

    表  1  各相带主量元素(wt%)地球化学分析数据

    Table  1.   Geochemical analysis data of major elements (wt%) in each lithofacies belt

    Sample YWS-1 YWS-2 YWS-3a YWS-3b YWS-3c YWS-3d YWS-4a YWS-4b YWS-5a YWS-5b YWS-5c YWS-6a YWS-6b YWS-7a YWS-7b YWS-7c YWS-7d
    SiO2 41.91 41.71 41.52 41.43 41.05 40.84 41.25 42.67 44.07 42.95 44.05 41.83 41.35 41.33 41.19 41.51 41.67
    TiO2 3.36 3.24 2.81 2.59 2.52 2.54 2.95 3.30 3.53 3.66 3.83 3.29 3.22 2.78 2.45 2.71 2.92
    Al2O3 10.81 10.67 8.63 7.87 8.07 8.07 9.88 10.46 13.59 14.05 14.64 10.40 10.03 8.82 7.97 8.51 9.18
    Fe2O3 4.64 3.90 4.28 4.25 4.26 3.77 3.90 3.91 12.09 12.24 12.88 4.18 4.00 3.81 3.53 3.91 3.86
    FeO 6.70 7.29 6.95 7.24 7.20 7.82 6.87 7.12 6.62 8.21 8.86 7.04 7.04 7.49 7.96 7.54 7.14
    MnO 0.20 0.26 0.16 0.20 0.20 0.21 0.23 0.24 0.64 0.55 0.48 0.38 0.33 0.24 0.25 0.25 0.26
    MgO 7.20 7.85 13.95 17.91 16.92 16.14 8.96 7.90 1.89 1.62 1.63 7.53 8.30 13.15 16.63 14.62 11.85
    CaO 11.40 10.89 10.92 8.85 9.55 9.68 11.84 10.85 5.84 5.20 2.45 11.48 12.33 10.83 8.77 9.47 10.99
    Na2O 3.11 3.13 1.77 1.06 1.31 1.55 2.93 3.09 2.29 3.31 5.12 3.20 2.92 2.11 1.26 1.79 2.39
    K2O 1.98 2.43 1.72 1.51 1.53 1.58 2.35 2.34 3.30 2.86 2.14 1.94 1.81 1.58 1.43 1.44 1.60
    P2O5 1.05 0.96 0.80 0.70 0.77 0.76 0.91 0.94 0.79 0.79 0.86 0.98 0.93 0.82 0.76 0.83 0.87
    LOI 7.09 7.11 6.01 5.74 6.10 6.38 7.33 6.59 5.05 4.04 2.74 7.66 7.58 6.68 7.21 7.01 7.00
    H2O+ 0.55 0.68 0.65 0.66 0.82 0.79 0.67 0.70 0.65 0.38 1.12 0.65 0.67 0.84 1.58 1.23 0.99
    H2O- 0.48 0.45 0.58 0.81 0.62 0.53 0.65 0.67 0.59 0.49 0.52 0.46 0.52 0.50 0.54 0.47 0.47
    Total 100.48 100.57 100.75 100.82 100.92 100.66 100.72 100.78 100.94 100.35 101.32 101.02 101.03 100.98 101.53 101.29 101.19
    下载: 导出CSV

    表  2  各相带微量元素和稀土元素(×10-6)地球化学分析数据

    Table  2.   Geochemical analysis data of trace element and rare earch elements (× 10-6) in each lithofacies belt

    Sample YWS-1 YWS-2 YWS-3a YWS-3b YWS-3c YWS-3d YWS-4a YWS-4b YWS-5a YWS-5b YWS-5c YWS-6a YWS-6b YWS-7a YWS-7b YWS-7c
    Sc 29.6 34.8 29.5 27.0 32.2 34.2 26.6 28.6 32.3 24.6 25.6 31.1 30.8 28.3 29.0 28.7
    V 324 330 276 231 279 308 241 248 363 292 352 306 289 265 237 255
    Cr 189 346 963 1250 473 364 1200 1190 12.3 5.63 7.56 282 375 817 1220 1020
    Co 40.9 42.7 62.3 75.8 65.4 68.6 48.2 42.3 34.3 30.7 47.8 44.2 43.9 56.3 65.2 64.2
    Ni 52.6 68.9 389 576 127 67.6 501 501 21.3 18.9 25.8 61.8 89.6 325 513 407
    Cu 111 121 80.3 48.4 87.6 104 47.7 50.5 6.36 13.4 23.5 94.3 103 109 40.8 80.0
    Zn 81.1 78.9 115 108 79.6 90.0 103 108 37.6 28.0 36.6 61.8 65.2 92.0 135 101
    Ga 17.8 19.3 15.9 12.7 13.0 16.4 19.3 19.2 33.3 26.4 26.8 19.6 18.5 16.0 14.3 16.8
    Rb 52.0 79.6 48.2 39.6 64.7 77.8 38.5 46.2 132 94.6 91.2 73.5 58.3 45.6 46.5 46.3
    Sr 1260 1189 936 989 1620 1356 987 1123 256 146 86 1110 1260 996 752 895
    Y 36.7 34.2 30.2 27.9 28.1 32.1 36.5 36.8 46.8 36.5 37.6 35.3 33.7 30.4 28.4 29.7
    Zr 428 389 319 372 295 398 310 316 378 374 419 405 413 339 292 321
    Nb 80.1 63.6 44.2 55.2 48.7 57.8 44.9 46.2 55.7 47.4 53.6 52.0 47.5 46.2 45.3 44.2
    Sb 0.37 0.28 0.29 0.25 0.28 0.21 0.24 0.26 0.12 0.13 0.13 0.19 0.25 0.31 0.35 0.36
    Cs 1.61 2.39 2.38 2.20 2.10 2.17 2.01 2.39 0.96 0.83 1.06 1.98 1.94 1.92 2.15 2.06
    Ba 236 246 214 152 226 245 304 235 248 369 366 249 263 256 268 352
    La 206 195 175 149 150 178 203 224 56.3 43.2 51.2 200 186 164 156 164
    Ce 398 385 337 287 287 336 396 423 125 103 119 380 357 318 302 302
    Pr 42.3 39.6 35.6 30.3 30.3 35.6 40.9 42.5 15.2 12.4 14.0 40.2 37.8 33.4 31.7 31.9
    Nd 168 163 146 123 126 145 167 184 63.5 53.6 63.9 164 155 138 131 132
    Sm 28.9 25.6 22.9 18.5 20.9 22.4 26.3 28.3 14.5 12.3 13.4 27.6 24.6 21.3 21.3 22.2
    Eu 6.74 6.23 5.75 4.97 5.01 5.85 6.54 6.69 4.32 3.45 4.05 6.58 6.22 5.56 5.14 5.24
    Gd 18.2 19.6 16.7 14.3 14.6 17.6 19.6 20.3 13.5 10.6 11.8 18.6 18.2 15.9 14.8 15.5
    Tb 2.22 2.36 2.06 1.80 1.79 2.22 2.33 2.55 2.29 1.53 1.72 2.23 2.21 2.00 1.84 1.90
    Dy 10.2 11.1 9.13 8.30 10.9 11.6 8.30 9.89 12.6 9.63 9.88 10.4 10.1 9.00 8.51 8.73
    Ho 1.52 1.63 1.44 1.28 1.59 1.75 1.27 1.53 1.92 1.42 1.63 1.54 1.50 1.36 1.29 1.30
    Er 3.63 3.71 3.31 2.98 3.73 3.78 2.96 3.50 5.13 3.85 3.96 3.59 3.43 3.15 2.93 3.03
    Tm 0.54 0.52 0.49 0.45 0.56 0.54 0.46 0.52 0.75 0.58 0.59 0.54 0.52 0.49 0.47 0.47
    Yb 2.73 2.90 2.57 2.34 3.00 3.20 2.35 2.63 3.96 2.78 2.98 2.81 2.69 2.51 2.33 2.39
    Lu 0.46 0.47 0.43 0.41 0.48 0.50 0.41 0.45 0.59 0.48 0.48 0.47 0.46 0.44 0.42 0.42
    Hf 10.7 10.0 10.0 10.1 9.26 9.96 8.22 10.6 8.78 9.62 10.6 10.2 10.3 10.1 10.4 8.93
    Ta 2.05 2.06 1.44 3.63 1.76 1.95 2.63 1.78 2.19 3.56 3.51 2.78 1.22 1.78 1.41 1.44
    Bi 0.15 0.17 0.26 0.37 0.23 0.26 0.27 0.33 0.18 0.25 0.19 0.36 0.26 0.21 0.38 0.36
    Th 23.6 18.2 10.3 20.4 17.2 13.6 13.5 17.6 3.89 3.95 4.02 13.5 13.2 15.4 14.3 16.2
    U 5.70 5.57 4.85 4.39 4.10 4.74 5.89 6.12 0.33 0.24 0.29 5.63 5.42 4.86 4.15 4.74
    下载: 导出CSV

    表  3  各相带Sm-Nd同位素分析数据

    Table  3.   The Sm-Nd isotope analysis data in each lithofacies belt

    样品号 Rb/×10-6 Sr/×10-6 87Sr/86Sr (87Sr/86Sr)i Sm/×10-6 Nd/×10-6 147Sm/144Nd 143Nd/144Nd (143Nd/144Nd)i εNd(t)
    YWS-1 52 1260 0.709398 0.707904 28.9 168 0.103991 0.512342 0.511762 4.3
    YWS-2 79.6 1189 0.709864 0.707441 25.6 163 0.094942 0.512320 0.511791 4.9
    YWS-3a 48.2 936 0.709211 0.707347 22.9 146 0.094818 0.512329 0.511800 5.1
    YWS-3b 39.6 989 0.708867 0.707418 18.5 123 0.090923 0.512325 0.511818 5.4
    YWS-3c 64.7 1620 0.708847 0.707401 20.9 126 0.100272 0.512309 0.511750 4.1
    YWS-3d 77.8 1356 0.708778 0.706701 22.4 145 0.093386 0.512294 0.511773 4.5
    YWS-4a 38.5 987 0.70911 0.707698 26.3 167 0.095202 0.512316 0.511785 4.8
    YWS-4b 46.2 1123 0.709481 0.707992 28.3 184 0.092977 0.512321 0.511803 5.1
    YWS-5a 132 256 0.739185 0.720520 14.5 63.5 0.138036 0.512258 0.511489 -1.0
    YWS-5b 94.6 146 0.746396 0.722941 12.3 53.6 0.138711 0.511969 0.511196 -6.8
    YWS-5c 91.2 86.3 0.781211 0.742957 13.4 63.9 0.126765 0.512213 0.511506 -0.7
    YWS-6a 73.5 1110 0.709751 0.707354 27.6 164 0.101735 0.512328 0.511761 4.3
    YWS-6b 58.3 1260 0.709367 0.707692 24.6 155 0.095942 0.512316 0.511781 4.7
    YWS-7a 45.6 996 0.709234 0.707577 21.3 138 0.093305 0.512313 0.511793 4.9
    YWS-7b 46.5 752 0.709523 0.707285 21.3 131 0.098291 0.512319 0.511771 4.5
    YWS-7c 46.3 895 0.709281 0.707408 22.2 132 0.101668 0.512320 0.511753 4.1
    YWS-7d 55.6 1080 0.709412 0.707548 24.6 151 0.098484 0.512319 0.511770 4.5
    下载: 导出CSV
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  • 收稿日期:  2018-06-04
  • 修回日期:  2018-08-26
  • 刊出日期:  2019-02-01

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