Zircon U-Pb age, element and Sr-Nd-Hf isotope geochemistry of Late Mesozoic magmatism from the Guichi metallogenic district in the Middle and Lower Reaches of the Yangtze River Region
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摘要:
长江中下游贵池地区燕山期侵入岩发育, 与成矿关系密切。本文对该区侵入岩开展了详细的锆石U-Pb年代学、地球化学及Sr-Nd-Hf同位素研究。结果表明, 马头花岗闪长斑岩形成于147±2Ma, 而花园巩石英二长岩形成于127±1Ma, 比花岗闪长斑岩晚约20Ma。早期的花岗闪长斑岩(147~145Ma) 为高钾钙碱性系列, 具有高Al2O3、Sr含量和Sr/Y、La/Yb比值, 以及低的Y、Yb含量, 与埃达克质岩的地球化学特征一致；而晚期石英二长岩(127Ma) 和石英正长岩为钾玄岩系列, 具有高的(Na2O+K2O)、Zr、Nb、Y含量和Y/Nb、Yb/Ta比值, 与造山带A2型花岗岩地球化学特征相似；碱长花岗岩(125~124Ma) 同样具有A型花岗岩的地球化学特征, 但与石英二长岩、石英正长岩相比, 碱长花岗岩的Y/Nb、Yb/Ta比值相对较低, 具板内环境A1型花岗岩的地球化学特征。因此, 贵池地区岩浆岩从早期的埃达克质岩变为晚期的A型花岗岩, 反应了晚中生代时期长江中下游地区的构造环境由大陆边缘环境向伸展环境的转变。
Abstract:Zircon U-Pb ages, elemental and Sr-Nd-Hf isotopic data are reported for Late Mesozoic plutons in the Guichi metallogenic district in the Middle and Lower Reaches of the Yangtze River Region, attempting to constrain their age, petrogenesis, and tectonic implications. The Matou granodiorite porphyry and the Huayuangong quartz monzonite were dated at 147±2Ma and 127±1Ma, respectively. The early Matou and Tongshan granodiorite porphyries are high-K calc-alkaline, and exhibit adakite-like geochemical features, such as high Al2O3, Sr, Sr/Y and La/Yb values, and low Y and Yb contents. The 127Ma Huayuangong quartz monzonites and quartz syenites are shoshonitic, and characterized by high (Na2O+K2O), Zr, Nb, Y, Y/Nb and Yb/Ta values, indicating A2-type granite affinity at convergent margins. The 125~124Ma Huangyuangong alkali feldspar granites also exhibit A-type granite geochemical features, while are characterized by lower Y/Nb and Yb/Ta values, resembling A1-type granite affinity in interplate settings. The change of geochemical features from adakitic rocks to A-type granite is magmatic response to tectonic transition, switching from a continental margin environments to a lithosphere extensional regime.
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Key words:
- Guichi /
- Late Mesozoic /
- Adakite-like /
- A-type granite
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图 1
长江中下游地区燕山期岩浆岩分布示意图(据Mao et al., 2011；翟裕生等, 1992)
Figure 1.
Schematic illustration of the Late Mesozoic magmatic rocks of the Middle-Lower Reaches of the Yangtze River metallogenic belt (after Mao et al., 2011; Zhai et al., 1992)
图 4
贵池地区侵入岩代表性锆石阴极发光图像
Figure 4.
CL images of representative zircons of the plutonic rocks from the Guichi region
图 5
贵池地区侵入岩锆石LA-ICP-MS U-Pb年龄谐和图解
Figure 5.
LA-ICP-MS zircon U-Pb concordia diagrams for the Guichi plutonic rocks
图 6
贵池地区侵入岩SiO2-(Na2O+K2O) 图解(a) 及SiO2-K2O图解(b) (底图据Middlemost, 1994；Rickwood, 1989)
Figure 6.
Geochemical characteristics of the plutonic rocks in the Guichi region (after Middlemost, 1994; Rickwood, 1989)
图 7
贵池地区埃达克质岩和A型花岗岩判别图解(底图据Wang et al., 2004b; Whalen et al., 1987)
Figure 7.
Discrimination diagrams for adakitic rocks and A-type granites of the Guichi plutons (after Wang et al., 2004b; Whalen et al., 1987)
图 8
贵池地区侵入岩稀土元素配分模式图(a, b) 及微量元素蛛网图(c, d)(标准化值据Sun and McDonough, 1989)
Figure 8.
Chondrite normalized rare earth element patterns (a, b) and primitive mantle normalized spiderdiagrams (c, d) of the plutonic rocks in the Guichi region (normalizing valves after Sun and McDonough, 1989)
图 9
贵池地区侵入岩ISr-εNd(t) 图解(底图据Jahn et al., 1999；其它数据来源及解释参见文中)
Figure 9.
Initial87Sr/86Sr versus εNd(t) plot for the Guichi plutonic rocks (after Jahn et al., 1999; see text for other data sources and explanation)
图 10
贵池地区侵入岩εNd(t)-εHf(t) 图解(底图据Vervoort et al., 1999；其它数据来源及解释参见文中)
Figure 10.
εNd(t) versus εHf(t) plot for the Guichi plutonic rocks (after Vervoort et al., 1999; See text for other data sources and explanation)
图 11
贵池地区侵入岩构造环境判别图解(底图据Batchelor and Bowden, 1985)
Figure 11.
Diagrams for discriminating tectonic settings of Guichi plutons (after Batchelor and Bowden, 1985)
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