| TTG岩系Nb-Ta-La分馏特征的地球化学模拟:对太古宙板块俯冲与大陆地壳生长机制的约束 |
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| 引用本文： | 程素华,汪洋.TTG岩系Nb-Ta-La分馏特征的地球化学模拟:对太古宙板块俯冲与大陆地壳生长机制的约束[J].大地构造与成矿学,2011,35(1):95-104. |
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| 作者姓名： | 程素华 汪洋 |
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| 作者单位： | 中国地质大学(北京)地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家自然科学基金项目，国家重点基础研究发展计划(973计划)，中央高校基本科研业务费专项资金 |
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| 摘 要： | TTG的Nb/Ta比值以及Nb、Ta相对于La(代表LILE)的亏损取决于部分熔融体系中金红石、角闪石作为残留相矿物存在与否.本研究采用金红石和低Mg#角闪石的微量元素分配系数模拟部分熔融过程中Nb-Ta-La的分馏.模拟结果表明:如果与TTG熔体平衡的残留相是不含金红石的石榴角闪岩,熔体Nb/Ta比值低于源岩但Ta含...
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| 关 键 词： | TTG Nb/Ta比值 地球化学模拟 板块俯冲 地壳生长 太古宙 |
Geochemical Modeling of Nb-Ta-La Fractionation in TTG Suite:Constraints on Archean Plate Subduction and Continental Crust Growth |
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| CHENG Suhua,WANG Yang.Geochemical Modeling of Nb-Ta-La Fractionation in TTG Suite:Constraints on Archean Plate Subduction and Continental Crust Growth[J].Geotectonica et Metallogenia,2011,35(1):95-104. |
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| Authors: | CHENG Suhua WANG Yang |
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| Institution: | CHENG Suhua and WANG Yang(School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China) |
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| Abstract: | The Nb and Ta concentrations as well as Nb/Ta ratios of TTG melt are controlled by the behaviors of rutile and amphibole in partial melting system. In this study,trace element partition coefficients of rutile and low-Mg# amphibole from recent experiments are used to model Nb-Ta-La fractionation during partial melting of basaltic rocks. Our geochemical modeling shows that:the melt is characterized by 1) lower Nb/Ta ratio (relative to that of primitive mantle) without Ta depletion (relative to La) for partial... |
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| Keywords: | TTG |
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