| 闽西南大田地区中生代岩浆岩特征及构造环境演化 |
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| 引用本文： | 范旭光,刘德民,李德威.闽西南大田地区中生代岩浆岩特征及构造环境演化[J].华南地质与矿产,2011,27(3):201-207. |
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| 作者姓名： | 范旭光 刘德民 李德威 |
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| 作者单位： | 1. 河南省煤田地质局一队,郑州,451150
2. 中国地质大学武汉地球科学学院,武汉,430074 |
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| 基金项目： | 建省大田县铅锌铜金属矿产成矿规律研究”项目资助 |
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| 摘 要： | 大田地区中生代岩浆岩普遍具有高硅、高铝的特点。汤泉岩体花岗闪长岩中锆石LA-ICP-MS U-Pb年龄为168±3 Ma,其样品中La/Yb较高,Eu亏损不明显,具有高Sr、低Y的地球化学特征,符合埃达克质岩特征,其形成与地壳增厚有关,处于挤压构造背景下;NNE向脉岩群样品锆石LA-ICP-MS U-Pb加权平均年龄为...
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| 关 键 词： | 岩浆岩 地球化学 锆石年代学 构造环境 中生代 大田地区 闽西南 |
Geochemical Characteristics and Tectonic Significance of Mesozoic Magmatic Rocks from Datian,Southweste Fujian |
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| FAN Xu-guang,Liu De-min,Li De-wei.Geochemical Characteristics and Tectonic Significance of Mesozoic Magmatic Rocks from Datian,Southweste Fujian[J].Geology and Mineral Resources of South China,2011,27(3):201-207. |
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| Authors: | FAN Xu-guang Liu De-min Li De-wei |
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| Institution: | FAN Xu-guang1,Liu De-min2,Li De-wei2(1.Coal Geology Bureau of Henan Province,Zhengzhou 451150,China,2.Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China) |
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| Abstract: | Mesozoic magmatic rocks in Datian area,Fujian province,are usually rich in SiO2 and Al2O3 content.Tangquan granodiorite which yielded zircon LA-ICP-MS U-Pb age of 168±3 Ma has high La/Yb and Sr,slightly Eu depletion,and poor in Y,is similar to adakite in geochemistry,indicate that it＇s formed in compressional setting related to crust thickening.NNE-trending granite veins which yielded zircon LA-ICP-MS U-Pb age of 138＋3 Ma has low La/Yb value and intensive Eu depletion,indicate that it＇s formed in late stage of compression process.Taihua granite which yielded Rb-Sr isochron age of 114.89±2.2 Ma has high La/Yb value and slightly Eu depletion,may be formed in extensional setting related to crust thinning when West Pacific subduction. |
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| Keywords: | magmatic rock geochemistry zircon chronology tectonic environment Mesozoic Datian Southwest Fujian |
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