| 湖北麻城市四道河地区面理化含榴花岗岩的成因 |
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| 引用本文： | 张富铁,夏斌,张玉泉,黄强太,张红,李贺. 湖北麻城市四道河地区面理化含榴花岗岩的成因[J]. 大地构造与成矿学, 2012, 36(2): 293-300. DOI: 10.3969/j.issn.1001-1552.2012.02.016 |
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| 作者姓名： | 张富铁 夏斌 张玉泉 黄强太 张红 李贺 |
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| 作者单位： | 1.中国科学院广州地球化学研究所,广东广州510640;中国科学院研究生院,北京100049;广东省有色金属地质勘查局地质勘查研究院,广东广州510080;2.中国科学院广州地球化学研究所,广东广州510640;中山大学海洋学院,广东广州510275;3.中国科学院广州地球化学研究所,广东广州,510640;4.中国科学院广州地球化学研究所,广东广州510640;中国科学院研究生院,北京100049 |
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| 基金项目： | 国家重点发展研究计划(973),国家自然科学基金,中国大洋协会项目 |
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| 摘 要： | 野外和室内研究结果表明,四道河地区面理化含榴花岗岩由古生代沉积岩变质而成.在元素地球化学特征上,具有与岩浆成因的碱性花岗岩一致的特点:高硅(SiO2=75.24％ ～ 77.23％)、富碱(Na2O+ K2O =6.87％ ～8.84％)、低铝(Al2O3=11.00％ ～ 12.78％);富Rb、Ba、Th、U等大离子亲石元素和Pb,贫Nb、Ta、Zr、Hf等高场强元素;稀土元素含量较高(ΣREE=101.08～180.1 μg/g),轻稀土元素相对富集(LREE/HREE=3.1 ～ 6.8),铕有中等负异常( δEu=0.30～0.68);锆石成因类型及定年结果表明,老核(继承锆石)是异地多时代(元古代-古生代),其寄主岩的原岩是沉积岩,时代不会早于古生代.
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| 关 键 词： | 地球化学 锆石U-Pb年龄 面理化含榴花岗岩 四道河 湖北麻城市 |
Petrogenesis of the Garnet-Bearing Granites in the Sidaohe Region, Macheng City, Hubei Province |
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| ZHANG Futie , XIA Bin , ZHANG Yuquan , HUANG Qiangtai , ZHANG Hong , LI He. Petrogenesis of the Garnet-Bearing Granites in the Sidaohe Region, Macheng City, Hubei Province[J]. Geotectonica et Metallogenia, 2012, 36(2): 293-300. DOI: 10.3969/j.issn.1001-1552.2012.02.016 |
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| Authors: | ZHANG Futie XIA Bin ZHANG Yuquan HUANG Qiangtai ZHANG Hong LI He |
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| Affiliation: | 1,2 (1.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3.Geological Survey Institute of Guangdong Nonferrous Metals Geological Survey Bureau, Guangzhou 510080, Guangdong, China; 4.School of Marine Sciences, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China) |
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| Abstract: | Field and laboratory studies show that the foliated garnet-bearing granites from the Sidaohe region were derived from the Paleozoic sedimentary rocks through metamorphism. Geochemical characteristics of the garnet-bearing granites are similar to those of the typical alkali granites, i.e., rich in silicon (SiO2=75.24%~77.23%), alkali (Na2O+K2O=6.87%~8.84%) and poor in aluminium (Al2O3= 11.00%~12.78%). The rocks are rich in lithophile trace elements (Rb, Ba, Th, U) and poor in HFS elements (Nb, Ta, Zr, Hf). The rocks are relatively rich in LREE (∑REE=101.08 ~180.1 μg/g, LREE/HREE=3.1~6.8) showing moderate negative Eu anomalies. Genetic types and ages of the zircons from garnet-bearing granites demonstrate that they are inherited zircons in sedimentary rocks formed no earlier than Paleozoic. |
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| Keywords: | geochemistry and zircon U-Pb age garnet-bearing granites Sidaohe region Macheng city, Hubei province |
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