| 赞皇杂岩中太古宙末期菅等钾质花岗岩的成因及动力学背景 |
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| 引用本文： | 杨崇辉,杜利林,任留东,宋会侠,万渝生,颉颃强,刘增校.赞皇杂岩中太古宙末期菅等钾质花岗岩的成因及动力学背景[J].地学前缘,2011,18(2):62-78. |
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| 作者姓名： | 杨崇辉 杜利林 任留东 宋会侠 万渝生 颉颃强 刘增校 |
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| 作者单位： | 杨崇辉,杜利林,任留东,宋会侠,Yang Chonghui,Du Lilin,Ren Liudong,Song Huixia(中国地质科学院,地质研究所,北京,100037);万渝生,颉颃强,Wan Yusheng,Xie Hangqiang(中国地质科学院,地质研究所,北京,100037;北京离子探针中心,北京,100037);刘增校,Liu Zengxiao(河北省地质矿产调查研究所,河北,廊坊,065000) |
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| 基金项目： | 中国地质调查局地质调查项目，中国地质科学院地质研究所基本科研业务费项目 |
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| 摘 要： | 赞皇杂岩中的菅等花岗岩体位于临城县西北,主要由钾长花岗岩和二长花岗岩组成,偶见暗色包体.菅等花岗岩SHRIMP锆石U-Pb年龄为(2 490±13)Ma.岩石具有高硅(SiO2 74.3%～75.4%)、高钾(K2O 5.76%～9.37%)、富碱(ALK 6.16%～9.51%)、贫钙(CaO 0.14%～0.81%...
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| 关 键 词： | 菅等花岗岩 赞皇杂岩 新太古代 构造背景 华北克拉通 |
Petrogenesis and geodynamic setting of Jiandeng potassic granite at the end of the Neoarchean in Zanhuang Complex, North China Craton |
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| Yang Chonghui,Du Lilin,Ren Liudong,Song Huixia,Wan Yusheng,Xie Hangqiang,Liu Zengxiao.Petrogenesis and geodynamic setting of Jiandeng potassic granite at the end of the Neoarchean in Zanhuang Complex, North China Craton[J].Earth Science Frontiers,2011,18(2):62-78. |
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| Authors: | Yang Chonghui Du Lilin Ren Liudong Song Huixia Wan Yusheng Xie Hangqiang Liu Zengxiao |
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| Institution: | 1.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China 2.Beijing SHRIMP Center,Beijing 100037,China 3.Hebei Institute of Geology and Mineral Resources,Langfang 065000,China |
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| Abstract: | Jiandeng granite in the Zanhuang Complex is located in the northwestern Lincheng County,Hebei Province.The pluton consists mainly of K-feldspar granite and monzo-granite with few quartz diorite enclaves.SHRIMP dating of zircon from the granite yielded an age of(2490±13)Ma.The rocks have high contents of SiO2(74.3%—75.4%),K2O(5.76%—9.37%) and alkali with K2O+Na2O=6.16%—9.51%,and low contents of CaO(0.14%—0.81%),TiO2(0.04%—0.15%),MgO(0.02%—0.49%) and total FeO(0.26%—1.05%),belonging to shoshonitic series with slightly peraluminous feature.They have lower REE contents((12.07—160.38)×10-6),with relative enrichment of the LREE and variational Eu anomaly(Eu/Eu*=0.46—1.97).The rocks are rich in large-ion lithophile elements(LILE) Rb,Ba and Th,and poor in Sr,Zr,Nb,Y and Yb,with high Rb/Sr and Rb/Ba ratios.They have positive ε Nd(t) value ranging from 2.85 to 3.66,with TDM2 ages between 2.55 and 2.64 Ga.SHRIMP dating of zircon from the quartz diorite enclave yielded an age of(2506±13)Ma.The quartz diorite is high in Al2O3(17.16%),Na2O(4.47%),CaO(4.34%) and TFeO(5.26%),and shows higher total REE content of 212.82×10-6,with a small Eu anomaly(Eu/Eu*=0.83).This rock is rich in Rb,Sr and Zr,and has an εNd(t) value of 3.05 and a TDM2 age of 2.63 Ga.The geochemical data show that the Jiandeng granite is similar to the S-type granite formed by anatexis of the juvenile crust in a tectonic transition setting from compression to extension,and the quartz diorite may represent a residue of the source rock.The formation of Jiandeng granite marks a tectono-magmatic event resulting in stabilization of the North China Craton at the end of the Neoarchean. |
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| Keywords: | Jiandeng granite Zanhuang Complex Neoarchean tectonic setting North China Craton |
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