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| 西藏当惹雍错富钾和富钠碱性火山岩的矿物学研究及其成因指示 | |
| 引用本文： | 于丽芳,赵文霞,陈建林,郭倩,王保弟.西藏当惹雍错富钾和富钠碱性火山岩的矿物学研究及其成因指示[J].大地构造与成矿学,2012,36(2):274-283. |
| 作者姓名： | 于丽芳 赵文霞 陈建林 郭倩 王保弟 |
| 作者单位： | 1. 中山大学测试中心,广东广州510275;广东省地质局七一九地质大队,广东肇庆526020 2. 中山大学测试中心,广东广州,510275 3. 中国科学院广州地球化学研究所同位素地球化学国家重点实验室,广东广州,510640 |
| 基金项目： | 国家自然科学基金，中国科学院重要方向性项目 |
| 摘 要： | 对青藏高原西南部当惹雍错地区的中新世超钾质粗面岩及共存的富钠质方沸石(霞石)响岩进行了详细的岩石学、矿物学研究,揭示出两套岩石具有不同的矿物学特征.钠质方沸石(霞石)响岩中橄榄石斑晶的熔体包裹体与钾质火山岩的成分相当,应属于早期残余的钾质岩浆,表明了钠质方沸石(霞石)响岩的形成晚于超钾质粗面岩.两类岩石的全岩化学成分、... |
| 关 键 词： | 矿物学 碱性火山岩 成因指示 当惹雍错 |
Mineralogical Characteristics of the Sodium- and Potassic-rich Alkaline Volcanic Rocks at Tangra Yumco,SE Tibet: Implications for Petrogenesis |
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| YU Lifang , ZHAO Wenxia , CHEN Jianlin , GUO Qian , WANG Baodi.Mineralogical Characteristics of the Sodium- and Potassic-rich Alkaline Volcanic Rocks at Tangra Yumco,SE Tibet: Implications for Petrogenesis[J].Geotectonica et Metallogenia,2012,36(2):274-283. | |
| Authors: | YU Lifang ZHAO Wenxia CHEN Jianlin GUO Qian WANG Baodi |
| Institution: | 1.Instrumental Analysis and Research Center, Sun Yat-sen University, Guangzhou 510275, Guangdong, China; 2.No.719 Brigade of Guangdong Geological Bureau, Zhaoqing 526020, Guangdong, China; 3.State Key Laboratory of Isotope Geochemistry; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China) |
| Abstract: | The Miocene sodium-rich analcime (nepheline) phonolite and coexisting ultrahigh-potassium trachytes at Tangra Yumco area in southwestern Qinghai-Tibet Plateau show distinct petrological and mineralogical characteristics. The magmatic inclusions within olivine phenocrysts in the sodium analcime (nepheline) phonolite are compositionally similar to the ultrapotassic volcanic rocks, indicating that the potassium magma was formed prior to the sodium magma. Because of the different whole rock components, mineral assemblages, mineral compositions and Ti-Al ratios in the clinopyroxene cores, the sodium analcime (nepheline) phonolites were likely derived from different mantle magmatic sources rather than fractional results of a potassic trachytic magma. |
| Keywords: | mineralogy alkaline volcanic rocks petrogenesis Tangra Yumco |
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