Geochemical and Zircon Hf Isotopic Characteristics of Mesozoic Intermediate-Acid Intrusive Rocks in Shujiadian Area, Tongling and Their Geological Significance
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摘要: 通过锆石LA-MC-ICP-MS Lu-Hf同位素分析,结合前人地球化学资料对舒家店地区中酸性侵入岩进行了研究.主量、微量元素地球化学特征表明区内侵入岩为准铝质,具有岛弧岩浆岩的特征,区内岩浆的演化可能经历了同化混染与分离结晶(AFC)过程.通过分析,我们认为舒家店地区的早白垩世岩浆活动可能与早白垩世初太平洋板块的斜向俯冲相关,侵入岩的形成演化受到了区域构造应力场的制约.Hf同位素分析及计算结果表明,除两个继承性锆石核外,本区侵入岩锆石的εHf(t)均为负值,橄榄安粗岩系列侵入岩的εHf(t)值为-8.6~-4.1,高钾钙碱性系列εHf(t)值为-13.4~-4.7.与高钾钙碱性系列相比,橄榄安粗岩系列侵入岩的εHf(t)更接近球粒陨石演化线.从εHf(t)值的变化特征来看,两个系列侵入岩均为来源于富集地幔,且在演化过程中混染了地壳物质,而高钾钙碱性系列在这个过程中混入了更多的地壳物质.Abstract: In this paper, we carry out research on intermediate-acid intrusive rocks in Shujiadian area in aspect of zircon LA-MC-ICP-MS Lu-Hf isotopes combining previous geochemical data. The characteristics of major and trace elements show that the rocks belong to metaluminous series with attributes of island arc magmatic rocks, and may have experienced assimilation-fractional crystallization (AFC) process. We considered that the Early Cretaceous magmatic activity might relate to the oblique subduction of the Pacific plate in the beginning of the Cretaceous, and the evolution of the intrusive rocks in the area were subject to the regional tectonic stress field. The Hf isotope analysis shows that except two inherited zircon cores, the εHf(t) values are negative, with shoshonite series being -8.6 to -4.1 and High-K calc-alkaline series -13.4 to -4.7. Comparing to the high-K calc-alkaline series rocks, the εHf(t) values of the shoshonite series are closer to chondrite evolution line. Considering from the variance of εHf(t) values for the two series, though they both originated from enriched mantle and were contaminated with crustal material during magmatic evolution, the high-K series was contaminated more during this process.
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Key words:
- Shujiadian /
- geochemistry /
- zircon Hf isotope /
- tectonic setting /
- material source
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图 1 铜陵地区构造-岩浆岩分布
N.新近系;K2.上白垩统;K1.下白垩统;J3.上侏罗统;J1-2.下中侏罗统;T22-T23.中三叠统;D3-T21.上泥盆统-下中三叠统;S.志留系;其中(b)据吴才来等(2013)
Fig. 1. Sketch map of distribution of tectonics-igneous rocks in Tongling area
图 5 舒家店中酸性侵入岩QAP图解
▲橄榄安粗岩系列;△高钾钙碱性系列;数据李进文等(2004);王世伟等(2011);吴才来等(2013);李名则等(2016)
Fig. 5. QAP triangular diagram of intermediate-acid intrusive rocks in Shujiadian area
图 6 舒家店地区中酸性侵入岩哈克图解
数据李进文等(2004);王世伟等(2011);吴才来等(2013);李名则等(2016)
Fig. 6. Harker diagram of intermediate-acid intrusive rocks in Shujiadian area
图 7 舒家店地区中酸性侵入岩哈克图解
标准化数据引自Sun and McDonough(1989); 数据王世伟等(2011);吴才来等(2013);李名则等(2016)
Fig. 7. Spider diagrams of trace elements and REE patterns for shoshonite and calc-alkaline series rocks of Shujiadian area
图 8 舒家店地区中酸性侵入岩构造环境判别图解
底图据Pearce et al.(1984);▲橄榄安粗岩系列,△高钾钙碱性系列;数据王世伟等(2011); 吴才来等(2013); 李名则等(2016)
Fig. 8. Discrimination diagrams of tectonic setting of intermediate-acid intrusive rocks in Shujiadian area
图 9 舒家店地区中酸性侵入岩FAM图解(%)
底图据Pearce et al.(1977);▲橄榄安粗岩系列,△高钾钙碱性系列;数据李进文等(2004); 王世伟等(2011); 吴才来等(2013),李名则等(2016);Ⅰ.洋中脊或洋底;Ⅱ.洋岛;Ⅲ.大陆;Ⅳ.扩张性中央岛:Ⅴ.造山带
Fig. 9. FeOt-MgO-Al2O3 diagram of intermediate-acid intrusive rocks in Shujiadian area
图 10 舒家店地区中酸性侵入岩La/Yb-δEu图解及Rb/Y-Nb/Y图解
▲橄榄安粗岩系列,△高钾钙碱性系列;数据王世伟等(2011);吴才来等(2013);李名则等(2016); 左图.底图据谢建成(2008); 右图.底图据Chazot and Bertrand(1995)修改
Fig. 10. La/Yb-δEu diagram and Rb/Y-Nb/Y diagram of intermediate-acid intrusive rocks in Shujiadian area
图 12 舒家店地区中酸性侵入岩T-εHf(t)及两阶段Hf模式年龄图解
其中宁芜盆地岩浆岩εHf(t)数据侯可军等(2010);胡劲平等(2010);陈志洪等(2013)
Fig. 12. Diagrams of T-εHf(t) of intermediate-acid intrusive rocks in Shujiadian area and histogram of two-stage Hf model ages of intrusive rocks of Shujiadian area (lower)
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