华北克拉通崤山太华群TTG质片麻岩年代学与地球化学特征:岩石成因机制探讨
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摘要
华北克拉通中部造山带南段崤山地区太华群变质杂岩中的TTG质片麻岩具较宽范围的Si O2(63.00%~73.13%)、Al2O3(14.22%~19.38%)和较低的Mg O(0.42%~1.62%)、Cr(4.7~19.2μg/g)和Ni(2.28~16.3μg/g),显示低Yb(0.54~1.16μg/g)、Y(5.49~11.6μg/g)以及高(La/Yb)N(22.4~47.7)和Sr/Y(12.4~84.3)的特征。其稀土元素配分曲线具明显Eu负异常,在微量元素蛛网图上显示显著的Nb-Ta、Ti负异常。崤山TTG片麻岩的原岩形成于新太古代晚期(~2.52 Ga)的加厚下地壳部分熔融,源区残留石榴子石及角闪石,斜长石结晶分异作用降低了岩浆体系的Sr含量和Sr/Y值。绝大部分继承锆石的形成时代(2544±8 Ma)接近于TTG岩浆结晶年龄,表明加厚下地壳源区物质组成相对较年轻。另外,崤山TTG质片麻岩具有正的岩浆锆石εHf(t)值(0.39~4.76)以及略低的继承锆石εHf(t)值(-1.88~3.05),与登封群新太古代TTG相似,均明显高于鲁山太华群新太古代早期TTG。因此,崤山TTG片麻岩具有明显的新生地壳组分,暗示了显著的地壳生长,可能与华北克拉通中部造山带南段新太古代活动大陆边缘增生造山过程相关。
The tonalite-trondhjemite-granodiorite(TTG) gneisses from the Taihua Group in the Xiaoshan area, the southern segment of the Trans-North China Orogen, have highly varied Si O2(63.00%-73.13%) and Al2 O3(14.22%-19.38%), and relatively low Mg O(0.42%-1.62%), Cr(4.7-19.2 μg/g) and Ni(2.28-16.3 μg/g). They are characterized by very low contents of Yb(0.54-1.16 μg/g) and Y(5.49-11.6 μg/g), with moderate(La/Yb)N(22.4-47.7) and Sr/Y(12.4-84.3) ratios, showing significant negative Eu anomalies on the chondrite-normalized REE patterns and pronounced negative Nb-Ta and Ti anomalies on the primitive mantle normalized trace element spider diagrams. The protolith of the Xiaoshan TTG gneisses was derived from partial melting of thickened lower crust at the end of Late Neoarchean(~2.52 Ga), with garnet and amphibole in residuals, while the low Sr contents and Sr/Y ratios might have resulted from plagioclase fractionation. Most relict zircons are only slightly older(2544±8 Ma) than the crystallization age of the TTG gneisses, suggesting overall juvenile materials of the thickened lower crust. In addition, magmatic zircons in the Xiaoshan TTG gneisses have positive εHf(t) values(0.39-4.76) whereas the relict zircons have slightly low εHf(t) values(from-1.88 to 3.05), which are similar to these of the Later Neoarchean TTG in the Dengfeng Complex, but higher than those of the Early Neoarchean TTG from the Taihua Complex in the Lushan area. Thus, the Xiaoshan TTG gneisses derived mainly from juvenile crustal material, suggesting noteworthy crustal accretion, which probably due to the Late Neoarchean accretionary orogeny of an active continental margin in the southern segment of the Trans-North China Orogen.
The tonalite-trondhjemite-granodiorite(TTG) gneisses from the Taihua Group in the Xiaoshan area, the southern segment of the Trans-North China Orogen, have highly varied Si O2(63.00%-73.13%) and Al2 O3(14.22%-19.38%), and relatively low Mg O(0.42%-1.62%), Cr(4.7-19.2 μg/g) and Ni(2.28-16.3 μg/g). They are characterized by very low contents of Yb(0.54-1.16 μg/g) and Y(5.49-11.6 μg/g), with moderate(La/Yb)N(22.4-47.7) and Sr/Y(12.4-84.3) ratios, showing significant negative Eu anomalies on the chondrite-normalized REE patterns and pronounced negative Nb-Ta and Ti anomalies on the primitive mantle normalized trace element spider diagrams. The protolith of the Xiaoshan TTG gneisses was derived from partial melting of thickened lower crust at the end of Late Neoarchean(~2.52 Ga), with garnet and amphibole in residuals, while the low Sr contents and Sr/Y ratios might have resulted from plagioclase fractionation. Most relict zircons are only slightly older(2544±8 Ma) than the crystallization age of the TTG gneisses, suggesting overall juvenile materials of the thickened lower crust. In addition, magmatic zircons in the Xiaoshan TTG gneisses have positive εHf(t) values(0.39-4.76) whereas the relict zircons have slightly low εHf(t) values(from-1.88 to 3.05), which are similar to these of the Later Neoarchean TTG in the Dengfeng Complex, but higher than those of the Early Neoarchean TTG from the Taihua Complex in the Lushan area. Thus, the Xiaoshan TTG gneisses derived mainly from juvenile crustal material, suggesting noteworthy crustal accretion, which probably due to the Late Neoarchean accretionary orogeny of an active continental margin in the southern segment of the Trans-North China Orogen.
引文
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Kusky T M and Santosh M.2009.The Columbia Connection in North China.Geological Society of London Special Publication,323:49-71.
Li X H,Long W G,Li Q L,Liu Y,Zheng Y F,Yang Y H,Chamberlain K R,Wan D F,Guo C H,Wang X C and Tao H.2010.Penglai zircon megacrysts:A potential new working reference material for microbeam determination of Hf-O isotopes and U-Pb age.Geostandards and Geoanalytical Research,34:117-134.
Liu D Y,Nutman A P,Compston W,Wu J S and Shen Q H.1992.Remnants of 3800 Ma crust in the Chinese Part of the Sino?Korean craton.Geology,20(4):339-342.
Liu D Y,Wilde S A,Wan Y S,Wang S Y,Valley J W,Kita N,Dong C Y,Xie H Q,Yang C X,Zhang Y X and Gao L Z.2009.Combined U-Pb,hafnium and oxygen isotope analysis of zircons from meta-igneous rocks in the southern North China Craton reveal multiple events in the Late-Mesoarchean?Early Neoarchean.Chemical Geology,261(1-2):339-342.
Liu S W,Pan Y M,Xie Q L,Zhang J and Li Q G.2004.Archean geodynamics in the Central Zone,North China Craton:Constraints from geochemistry of two contrasting series of granitoids in the Fuping and Wutan complexes.Precambrian Research,130:229-249.
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