Petrogenesis and tectonic significance of Late Carboniferous quartz diorite in Xi Ujimqin Banner, Inner Mongolia
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摘要:
内蒙古西乌旗地区出露一些石英闪长岩，其LA-ICP-MS锆石U-Pb年龄为（304.64±0.82）Ma和（309.84±0.86）Ma，表明这套岩石形成于晚石炭世。地球化学分析表明，西乌旗地区石英闪长岩属于低TiO2和高Al2O3钙碱性玄武岩系列；富集Rb、Ba、K大离子亲石元素（LILE），亏损Nb、Ta、Ti、P等高场强元素（HFSE），具有典型弧岩浆岩的特征，显示岩浆源区曾经历过俯冲带流体的交代作用；稀土元素丰度偏低，呈LREE富集HREE亏损的右倾模式；强不相容元素比值（La/Nb、La/Ta等）及判别图解表明晚石炭世石英闪长岩类似大陆边缘弧玄武岩，岩浆来源于浅部岩石圈地幔，系石榴石+尖晶石二辉橄榄岩源区中等程度（10%~20%）部分熔融的结果。综合研究区样品的地球化学特征，结合区域地质资料及对比分析前人成果，认为早石炭世末期西乌旗地区在强烈拉张的裂谷环境下形成了有限洋盆，由于洋盆发育不成熟或边伸展边向两侧俯冲-消减，形成了西乌旗地区类似大陆边缘弧玄武岩特征的晚石炭世石英闪长岩。
Abstract:Late Carboniferous quartz diorites are distributed in the Xi Ujimqin Banner of Inner Mongolia. The results of LA-ICPMS zircon U-Pb dating of the quartz diorite samples indicate ages of 304.64±0.82 Ma and 309.84±0.86 Ma. In addition, new geochemical data from six quartz diorite samples are presented. All six samples show high Al2O3 values but low TiO2 values, and are thus classified as calc-alkali basalt series. These samples are characterized by low REE abundance and slight LREE enrichment. They also show LILE enrichment, HFSE depletion and distinctly negative Nb and Ta anomalies. All of these characteristics resemble those of arc magmatic rocks. Furthermore, as shown in the correlation plots of La/Ba versus La/Nb, Ba/La versus Ce/Pb, and Nb/Y versus La/Yb, the magma source has experienced contamination and metasomatism from the subduction fluid. According to the Zr/Nb, La/Nb, La/Ta ratios and the diagram of Sm/Yb versus La/Sm, the magma was derived from the shallow lithospheric mantle and formed by moderate (10%-20%) partial melting of spinel-garnet lherzolites. Based on geochemical characteristics of these samples in this study, combined with regional geological data and previous research results, the authors hold that, in the late EarlyCarboniferous, there was a new limited ocean basin under an intensely extensional rift setting. Consequently, as the newly formed ocean basin was still immature or experienced subduction-related contamination and metasomatism, the Late Carboniferous quartz diorites of Xi Ujimqin Banner exhibited the continental margin-arc-like enriched signatures.
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Keywords:
- quartz diorite /
- zircon U-Pb dating /
- geochemistry /
- extensional setting /
- late Carboniferous /
- Xi Ujimqin Banner
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致谢: 野外得到高德臻教授、张能高工、刘志慧博士、杜杨工程师的的指导与帮助，行文过程中得到李宝霞工程师的帮助，审稿专家和编辑部老师为论文的最终定稿付出了大量心血，对他们的帮助一并表示衷心感谢。
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图 2 石英闪长岩野外与显微照片
Figure 2. Representative field photos and photomicrographs of quartz diorites
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图 4 石英闪长岩LA-ICP-MS锆石U-Pb年龄协和图
Figure 4. LA-ICP-MS U-Pb concordia diagrams for analyzed zircon grains from quartz diorites
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图 5 TAS图解(a)和AFM图解(b) (据[22]修改)
1-橄榄辉长岩；2a-碱性辉长岩；2-b亚碱性辉长岩；3-辉长闪长岩；4-闪长岩；5-花岗闪长岩；6-花岗岩；7-硅英岩；8-二长辉长岩；9-二长闪长岩；10-二长岩；11-石英二长岩；12-正长岩；13-副长石辉长岩；14-副长石二长闪长岩；15-副长石二长正长岩；16-副长正长岩；17-副长深成岩虚线下方亚碱性，上方碱性
Figure 5. TAS diagram (a) and AFM diagram (b) (modified after reference [22])
1-Olive gabbro; 2a-Alkaline gabbro; 2b-Sub-alkaline gabbro; 3-Gabbro diorite; 4-Diorite; 5-Granodiorite; 6-Granite; 7-Quartzolite; 8-Monzogabbro; 9-Monzodiorite; 10-Monzonite; 11-Quartz monzonite; 12-Syenite; 13-Foid gabbro; 14-Foid monzodiorite; 15-Foid monzosyenite; 16-Foid syenite; 17-Foid plutonite The sub-alkaline rocks are below the dashed line, whereas the alkaline rocks are above the dashed line
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图 7 Sm/Yb-La/Sm图解(a, 据[27])和La/N b-La/Ba图解(b, 据[30])
DM-亏损地幔；PM-原始地幔；N-MORB-正常洋中脊玄武岩；E-MORB-富集洋中脊玄武岩；MORB-洋中脊玄武岩；OIB-洋岛玄武岩；HIUM-高U/Pb比值地幔
Figure 7. Sm/Yb-La/Sm diagram (a) (modified after reference [27]) and La/Nb-La/Ba diagram (b) (modified after reference [30])
DM-Depleted mantle; PM-Primitive mantle; N-MORB-Normal mid-ocean ridge basalts; E-MORB-Enriched mid-ocean ridge basalts; MORB-Mid-ocean ridge basalts; OIB-Ocean island basalts; HIUM-High U/Pb ratio mantle
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a：AⅠ+ AⅡ-板内碱性玄武岩；B-富集型洋中脊玄武岩；C-板内拉斑玄武岩+火山弧玄武岩；D-正常洋中脊玄武岩+火山弧玄武岩。b：A-正常洋中脊玄武岩；B-富集型洋中脊玄武岩；C-板内碱性玄武岩及分异产物；D-火山弧拉斑玄武岩及分异产物。c：1A-钙碱性大陆火山弧玄武岩；1B-钙碱性大陆火山弧玄武岩和大陆火山弧拉斑玄武岩区过渡区；1C-大陆火山弧拉斑玄武岩区；2A-大陆玄武岩；2B-弧后盆地玄武岩；3A-大陆裂谷碱性玄武岩；3B和3C-异常洋中脊玄武岩；3D-正常洋中脊玄武岩。d：MORB-洋中脊玄武岩；WPB-板内玄武岩
Figure 9. Tectonic environmental discriminative diagrams of trace elements (modified after references [35-38])
(Fig. a. modified after reference [37]; Fig. b. modified after reference [35]; Fig. c. modified after reference [36]; Fig. d. modified after reference [38])
a: AⅠ+ AⅡ-Intraplate alkali basalts; B, E-MORB, Enriched mid-ocean ridge basalts; C, Intraplate tholeiites and volcanic-arc basalts; D-NMORB and volcanic-arc basalts. b: A-N-MORB, Normal mid-ocean ridge basalts; B-E-MORB, Enriched mid-ocean ridge basalts; C-Intraplate alkaline basalts; D-Island-arc tholeiites. c: 1A-Calcium alkaline continental island arc basalts; 1B-Transition zone; 1C-Volcanic arc tholeiite; 2AContinental basalts; 2B-Arc-back basin basalts; 3A-Continental rift alkaline basalts; 3B and 3C, Abnormal mid-ocean ridge basalts; 3D-Normal mid-ocean ridge basalts. d: MORB-Mid-ocean ridge basalts; WPB-Intraplate basalt表 1 西乌旗地区石英闪长岩LA-ICP-MS锆石U-Pb测年结果
Table 1 LA-ICP-MS zircon U-Pb isotopic data of quartz diorites from Xi Ujimqin Banner
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表 2 西乌旗地区石英闪长岩主量元素分析结果（%）、微量元素分析结果（10-6）
Table 2 Major (%) and trace element (10-6) analytical result of quartz diorites from Xi Ujimqin Banner
下载: 导出CSV
表 3 西乌旗地区石英闪长岩不相容元素对比值判别构造环境
Table 3 Incompatible element ratios for discriminating tectonic environment of quartz diorites from Xi Ujimqin Banner
下载: 导出CSV
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