Geochemical Characteristics and Tectonic Significance of Granite from Nanfen Metamorphic Core Complexes in Liaoning
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摘要: 弓长岭花岗岩是南芬变质核杂岩的组成部分，同时也是鞍山-本溪地区前寒武基底的重要组成部分，对其进行探讨对于了解华北克拉通地区在2.50 Ga时期的大地构造背景具有重要意义.选取鞍山-本溪地区的南芬变质核杂岩核部弓长岭花岗片麻岩为研究对象，挑选2件样品中的锆石进行了LA-ICP-MS U-Pb年龄测试，获得不一致线上交点年龄分别为2 505±14 Ma（MSWD=1.30，n=70）和2 507±11 Ma（MSWD=1.16，n=80），代表岩浆结晶的年龄.岩石富SiO2为70.14%~75.36%、K2O为3.12%~6.84%和Al2O3为11.78%~13.75%、全碱（Na2O+K2O）含量在7.8%~9.64%，里特曼指数为1.98~2.94，AR值3.6~9.1显示高硅、富碱特征，A/CNK在0.95~1.23，大部分大于1.11，为强过铝质岩石.较高的稀土含量（∑REE=177.15×10-6~505.64×10-6），轻、重稀土分异明显，LaN/YbN=8.14~29.92，显著富集Rb、Th、Zr、Hf等元素，亏损Nb、Ti等元素，这些特征表明弓长岭花岗岩是在陆块发生碰撞的大地构造背景下由地壳的泥质岩类提供的物源发生部分熔融经分异结晶形成.表明在2.50 Ga时期鞍山-本溪地区处在由陆块发生拼合且向稳定的克拉通化演化的后碰撞阶段.Abstract: The Gongchangling granite is the part of Nanfen metamorphic core complex and is also an important part of the Precambrian basement of Anshan-Benxi area. In order to investigate the tectonic significance of North China craton in Neoproterozoic to Paleoproterozoic, the Gongchangling granite in the Nanfen metamorphic core complex was selected as the research object. LA-ICP-MS U-Pb analyses of 2 zircon samples yield the upper intercept ages of 2 505±14 Ma (MSWD=1.30, n=70) and 2 507±11 Ma (MSWD=1.16, n=80), which represents the crystallization time of the magma. The studied samples have high SiO2 of 70.14% to 75.36%, K2O of 3.12% to 6.84%, Al2O3 of 11.78% to 13.75% and total alkali (Na2O+K2O) of 7.8% to 9.64%.The samples show Rittmann index(δ) from 1.98 to 2.94, and AR from 3.6 to 9.1, which suggests that the granite is enriched in silicon and alkali. A/CNK=0.95-1.23, with the majority of more than 1.11, indicate that it is peraluminous rock. Results show ∑REE=177.15×10-6-505.64×10-6, LaN/YbN=8.14-29.92, obvious fractionation of LREE to HREE, enriched LILE, such as Rb, Th, Zr, Hf, depleted of Nb, Ti and other elements. The geochemical characteristics of rocks indicate that the Gongchangling granite was formed by partial melting of the crustal argillite in the collision tectonic setting of the continental block through differentiation and crystallization. It is indicated that the Anshan-Benxi area was in the transition period in 2.50 Ga from post-collision to stable stage after assemblage of the continental blocks.
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图 1 南芬地区地质简图
1.白垩世岩体；2.侏罗世岩体；3.新太古代岩体；4.鞍山群；5.弓长岭岩体；6.主拆离断层；7.逆断层；8.正断层；9.走滑断层；10.韧性剪切带
Fig. 1. Sketch map of Nanfen area
图 2 露头构造变形现象
a.拆离段层上盘地层滑脱造成地层中的能干性较差的岩层形成轴面内倾横弯褶皱；b.弓长岭岩体与上覆地层断层接触；c.石英、长石等矿物旋转变形呈拉长的眼球状；d-e.构造片麻岩中条带强烈弯曲，形成不对称流动褶皱；f.上盘浪子山岩组片岩中的石英呈眼球状、条带状
Fig. 2. Photos of deformation behavior in the studied area
图 3 南芬变质核杂岩显微构造图
a.眼球状长石斑晶压力影；b.长英质糜棱岩中的石英剪切条带型书斜式构造；c.糜棱岩，石英呈SR与GBM重结晶, S-C组构指示上盘向北西运动；d.矩形多晶石英条带，部分石英条带成透镜状、石香肠状，长石主要发生膨凸重结晶作用并细粒化.Fel.长石；Bt.黑云母；Qtz.石英
Fig. 3. Microstructure of Nanfen metamorphic core complex
图 4 弓长岭花岗岩野外照片和镜下照片特征
Fig. 4. Photograph and microphotograph features of Gongchangling granite
图 5 南芬变质核杂岩核部花岗岩锆石U-Pb谐和图与阴极发光照片
Fig. 5. Representative zircon CL images and LA-ICP-MS zircon U-Pb concordia diagrams of granite of Nanfen metamorphic core complex
图 6 弓长岭花岗岩的地球化学分类及A/NK-A/CNK和A/MF-C/MF图解
图a据Peccerillo and Taylor(1976)；图b据Pearce et al.(1984)；图c据Rickwood(1989)；图d据Maniar and Piccoli(1989)
Fig. 6. Geochemical classification and A/NK-A/CNK, A/MF-C/MF diagrams of Gong Changling granite
图 7 稀土元素球粒陨石标准化配分图解（a）和微量元素原始地幔标准化蛛网图（b）
Fig. 7. Chondrite-normalized REE patterns(a) and primitive mantle-normalized spidergram(b) for the granite of Nanfen metamorphic core complex
图 8 弓长岭花岗岩哈克图解
Fig. 8. Hark diagrams of Zr versus selected trace elements for the Gongchangling granite
图 9 弓长岭花岗岩的构造环境图解
据Pearce et al.(1984)；Pearce, 1996. VAG.火山弧花岗岩；Syn-COLG.同碰撞花岗岩；Post-COLG.后碰撞花岗岩；WPG.板内花岗岩；ORG.洋脊花岗岩
Fig. 9. The tectonic environment diagram of Gongchangling granite
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