Geochronology, Geochemistry and Tectonic Setting of the Guanmenshan Pluton in Benxi, Eastern Liaoning Province
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摘要: 在辽东中部的本溪-宽甸一带发育有较大规模的中生代岩浆岩，关于这些岩体的形成时代、岩浆来源及构造背景的研究相对滞后.本溪关门山岩体由花岗斑岩和碱长花岗岩构成，对其进行了岩石学、岩石地球化学及年代学研究.LA-ICP-MS锆石U-Pb定年结果表明，花岗斑岩侵位年龄为126.4±1.5 Ma，碱长花岗岩侵位年龄为125.7±1.7 Ma，形成于早白垩世.花岗斑岩和碱长花岗岩的主量元素具有富Si、K，贫Fe、Mg、Ca、Ti的特征，A/CNK=0.95~1.12；微量元素富集高场强元素K、Th、Rb，亏损Ba、Sr、Ti、P等；具有明显的负Eu异常，（La/Yb）N=7.62~17.32，轻重稀土元素分异明显.上述特征表明关门山岩体属于A型花岗岩.结合地球化学特征，关门山岩体为非造山的伸展构造背景下的岩浆活动产物，其受控于古太平洋板块向欧亚大陆俯冲的岩石圈减薄环境，是华北板块东部伸展地球动力学背景的具体体现.Abstract: Large-scale Mesozoic magmatic rocks developed in the Benxi-Kuandian area in central eastern Liaoning Province. However, research on the formation age, magmatic source, and tectonic setting of these rocks relatively lags behind. Guanmenshan pluton is mainly composed of granite porphyry and alkali-feldspar granite, and its petrology, petrogeochemistry and chronology have been studied. LA-ICP-MS zircon U-Pb dating indicates that the emplacement age of the granite porphyry is 126.4±1.5 Ma, the emplacement age of the alkali-feldspar granite is 125.7±1.7 Ma, and that the pluton was emplaced in Early Cretaceous. The major elements of the granite porphyry and the alkali-feldspar granite are high in Si and K, and low in Fe, Mg, Ca and Ti, A/CNK=0.95-1.12. Trace elements are enriched in incompatible elements such as K, Rb, Th and depleted in Ba, Sr, Ti and P, with evident negative Eu anomalies, (La/Yb)N=7.62-17.32, and high field strength elements. These features suggest that the Guanmenshan pluton belongs to A-type granite. Combined with geochemical characteristics, the Guanmenshan pluton is the product of magmatism in the extensional tectonic setting, which was controlled by the subduction of Izanagi Plate to Eurasia Plate in the lithosphere thinning environment. It is considered a concrete manifestation of the eastern North China Plate stretch geodynamic setting.
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图 1 辽东本溪关门山地区地质简图（a）和中国东北构造地质简图（b）
图b据杨凤超等（2018）. 1.第四系；2.流纹质火山角砾凝灰岩；3.含煤地层；4古生界灰岩；5.青白口系石英砂岩；6.辽河群大理岩；7.花岗斑岩；8.碱长花岗岩；9.石英正长岩；10.霓霞正长岩；11.角度不整合；12.逆断层；13.性质不明断层；14.采样位置及编号
Fig. 1. Geological sketch of the Guanmenshan, eastern Liaoning Province (a) and tectonic map of Northeast China (b)
图 2 研究区花岗斑岩和碱长花岗岩的宏观和显微特征
a、b.花岗斑岩的野外照片及镜下特征；c、d.碱长花岗岩的野外照片及镜下特征. Q.石英；Pl.斜长石；Pth.条纹长石；Bi.黑云母
Fig. 2. Macro and Micro characteristics of granite porphyry and alkali-feldspar granite
图 3 花岗斑岩（a）和碱长花岗岩（b）的锆石CL图像
Fig. 3. CL images of zircons from granite porphyry (a) and alkali-feldspar granite (b)
图 4 花岗斑岩（a）和碱长花岗岩（b）的锆石LA-ICP-MS U-Pb年龄谐和图
Fig. 4. Concordia diagrams showing LA-ICP-MS zircon U-Pb ages for granite porphyry (a) and alkali-feldspar granite (b)
图 5 花岗斑岩和碱长花岗岩的TAS图解(a)和SiO2-K2O图解(b)
Fig. 5. TAS (a) and SiO2-K2O (b) diagrams for granite porphyry and alkali-feldspar granite
图 6 花岗斑岩和碱长花岗岩的球粒陨石标准化稀土元素配分模式（a）和原始地幔标准化微量元素蛛网图（b）
标准化值分别据Boynton（1984）和Sun and McDonough（1989）
Fig. 6. Chondrite-normalized REE pattern (a) and primitive mantle-normalized trace element spider diagram (b) for granite porphyry and alkali-feldspar granite
图 7 花岗斑岩和碱长花岗岩的A型花岗岩判别图解
a.底图据Whalen et al.（1987）；b.底图据
Eby（1992） Fig. 7. Discrimination diagrams of A-type granites for granite porphyry and alkali-feldspar granite
图 8 花岗斑岩和碱长花岗岩的构造环境R1-R2判别图（a）和（Y+Nb）-Rb判别图（b）
R1= 4Si－11(Na+K)－2(Fe+Ti)，R2= 6Ca+2Mg+Al
Fig. 8. R1-R2 (a) and (Y+Nb)-Rb (b) diagrams for granite porphyry and alkali-feldspar granite
图 9 辽东半岛中生代构造-岩浆活动分布
Fig. 9. Mesozoic tectonic-magmatic activity in the eastern Liaoning Province
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