Neoproterozoic (~800 Ma) Subduction of Ocean-Continent Transition: Constraint from Arc Magmatic Sequence in Kaihua, Western Zhejiang
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摘要: 浙西开化地区处于江南造山带东段，沿下庄-树范断裂北西侧发育一套浅变质的玄武岩-安山岩-英安岩-流纹岩组合.地球化学分析结果显示，玄武岩、安山岩和英安岩、流纹岩表现为连续演化的岩浆序列，岩石多富集Ba、K、Rb，亏损Sr等大离子亲石元素，富集Pb，亏损P、Ti、Ta、Nb等高场强元素.玄武岩Nb含量介于11.8×10-6~15.2×10-6，Nb/Ta=15.36~18.10，Nb/U=8.90~19.32，具有富Nb特点；安山岩MgO含量为5.31%~8.56%，Mg#值为56.89~68.83，FeOT/MgO介于0.82~1.36，显示高Mg特征；英安岩和流纹岩Ga/Al比值高，且FeOT/MgO多介于5.66~18.50，锆石饱和温度为837~920℃，表现出A型酸性火山岩特征.锆石U-Pb定年结果表明，玄武岩、安山岩和流纹岩的成岩年龄分别为800.5±9.2 Ma、799.3±7.1 Ma和798.3±6.2 Ma，均系新元古代（~800 Ma）构造岩浆活动的产物.富Nb玄武岩和高Mg安山岩组合为活动陆缘弧的典型代表，而英安岩和流纹岩则可能形成于俯冲机制下的拉张环境，进一步表明新元古代（~800 Ma）左右，古华南洋北西向扬子陆块的俯冲仍在继续.Abstract: As a record of the process for ocean-continent transition related oceanic subduction, the magmatic rocks consisting of the basalts, andesites, dacites and rhyolites, were identified near the northwastern Xiazhuang-Shufan fault in Kaihua County, western Zhejiang, which is the eastern segment of Jiangnan orogeny. Geochemical analyses indicate that the basalts and andesites are mostly enriched in Ba, K, Rb, Th, U, Pb, but depleted in Sr, P, Nb, Ta, Ti. The basalts show high Nb contents of 11.8×10-6 to 15.2×10-6, Nb/Ta=15.36-18.10, and Nb/U=8.90-19.32. The andesites have higher Mg values with MgO contents ranging from 5.31% to 8.56%, Mg# ranging from 56.89 to 68.83, and FeOT/MgO=0.82-1.36. The dacites and rhyolites have higher Ga/Al ratios, FeOT/MgO ranging from 5.66 to 18.50 mostly, and high magma temperatures (837-920℃), reflecting the characteristics of A-type rhyolites. The U-Pb dating of zircon yields age of 800.5±9.2 Ma for the Nb-enriched basalt, 799.3±7.1 Ma for the high-Mg andesite, and 798.3±6.2 Ma for the A-type rhyolite, confirming that the magmatic activity of continental marginal arc occurred when the paleo-South-China Plate subducted northwestwardly in Neoproterozoic, and suggesting that the subducting movement continued to 800 Ma or later.
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Key words:
- Nb-enriched basalt /
- high-Mg andesite /
- geochronology /
- geochemistry /
- Neoproterozoic /
- western Zhejiang
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图 2 开化地区新元古代火山岩锆石的阴极发光图像及分析点位和206Pb/238U视年龄
Fig. 2. CL photomicrographs, meansured points and age data (206Pb/238U) of zircons for the Neoproterozoic volcanic rocks in Kaihua area
图 3 开化地区新元古代火山岩锆石U-Pb年龄谐和图和加权平均年龄
Fig. 3. 207Pb/235U vs. 206Pb/238U concordia ages and average model ages of zircons for the Neoproterozoic volcanic rocks in Kaihua area
图 4 开化地区新元古代火山岩Harker图解
Fig. 4. Hacker diagrams for the Neoproterozoic volcanic rocks in Kaihua area
图 5 开化地区新元古代火山岩岩石分类图解
Fig. 5. Classification diagrams for the Neoproterozoic volcanic rocks in Kaihua area
图 6 新元古代火山岩稀土元素球粒陨石标准化曲线和微量元素蛛网图
标准值据Sun and McDonough（1989）；大陆弧安山岩蛛网曲线据Zheng et al.（2012）
Fig. 6. Chondrite-normalized REE patterns and trace element spider diagram for the Neoproterozoic volcanic rocks in Kaihua area
图 7 开化地区新元古代火山岩岩石类型图解
图a据Defant et al.（1992）；图b据赵振华等（2004）；图c、d据Deng et al.（2009）；图e、f据Whalen（1987）.HMA.高镁安山岩/闪长岩类；MA.镁安山岩/闪长岩类；LF.低铁钙碱性系列；CA.钙碱性系列；FG.分异的长英质花岗岩；OGT.未分异的I、S和M型花岗岩；I & S.I和S型花岗岩；A.A型花岗岩
Fig. 7. Diagrams of rock types for the Neoproterozoic volcanic rocks in Kaihua area
图 8 开化地区新元古代火山岩成因判别图解
图a据Pearce（2008）；图b据Condie（2005）；图c据马芳和薛怀民（2017）；图d据孙赛军等（2015）.LC.下地壳；MC.中地壳；UC.上地壳；OIB.洋岛玄武岩；E-MORB.富集型洋中脊玄武岩；N-MORB.正常型洋中脊玄武岩；PM.原始地幔；DM.亏损地幔；HIMU.高μ(U/Pb)源区；EM1.Ⅰ型富集地幔源区；EM2.Ⅱ型富集地幔源区；DEP.深部亏损地幔；EN.富集端元；REC.循环端元；BCC.平均大陆地壳；LCC.大陆下地壳；DMM.亏损地幔
Fig. 8. Discrimination diagrams for the Neoproterozoic volcanic rocks in Kaihua area
图 9 开化地区新元古代火山岩构造环境判别图解
图a、b、c据Pearce（2008, 2014）；图d据Batchelor and Bowden（1985）；图e据Pearce（1996）；图f据Eby（1992）.SHO.钾玄岩系列；CA.钙碱性系列；TH.拉斑系列；ICA.岛弧钙碱系列；IAT.岛弧拉斑系列；TR.过渡玄武岩系列；ALK.碱性玄武岩系列；IAB.岛弧玄武岩；MORB.洋中脊玄武岩；WPB.板内玄武岩；BABB.弧后盆地玄武岩；FAB.弧前玄武岩
Fig. 9. Tectonic discrimination diagrams for the Neoproterozoic volcanic rocks in Kaihua area
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