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| 拉萨地块麻江地区具有“超钾质”成分的钾质火山岩的识别及成因 | |
| 引用本文： | 王保弟,陈陵康,许继峰,刘鸿飞,陈建林,康志强.拉萨地块麻江地区具有“超钾质”成分的钾质火山岩的识别及成因[J].岩石学报,2011,27(6):1662-1674. |
| 作者姓名： | 王保弟 陈陵康 许继峰 刘鸿飞 陈建林 康志强 |
| 作者单位： | 1. 成都地质矿产研究所,成都610081;中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广州510640 2. 中国地质大学地球科学学院,武汉,430074 3. 中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广州,510640 4. 西藏自治区地质调查院,拉萨,850000 |
| 基金项目： | 本文受国家重点基础研究发展规划(2009CB421004、2009CB421003)、国家自然科学基金(41073033、40930316、40872055)和中科院知识创新项目(KZCX2-YW-Q04-2)联合资助. |
| 摘 要： | 一般认为青藏高原拉萨地块后碰撞钾质-超钾质岩浆活动由西向东逐渐喷发,然而本文在拉萨地块中部麻江地区识别出一套钾质火山岩,利用单矿物金云母的40Ar-39Ar方法确定其形成于21.3Ma.这套火山岩具有高镁(＞3％)和高钾( K2O/Na2O ＞2)等的超钾质火山岩成分特征,但其高的MgO含量是因岩石中含有后期蚀变矿物白... |
| 关 键 词： | 钾质-超钾质岩 后碰撞岩浆作用 时间分布 麻江 拉萨地块 |
| 收稿时间： | 1/4/2010 12:00:00 AM |
| 修稿时间： | 2010/11/6 0:00:00 |
Identification and petrogenesis of potassic volcanic rocks with "ultrapotassic" characteristics from Maqiang area in Lhasa block |
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| WANG BaoDi,CHEN LingKang,XU JiFeng,LIU HongFei,CHEN JianLin and KANG ZhiQiang.Identification and petrogenesis of potassic volcanic rocks with "ultrapotassic" characteristics from Maqiang area in Lhasa block[J].Acta Petrologica Sinica,2011,27(6):1662-1674. | |
| Authors: | WANG BaoDi CHEN LingKang XU JiFeng LIU HongFei CHEN JianLin and KANG ZhiQiang |
| Institution: | Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China;Key Laboratory of Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China;Key Laboratory of Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Institute of Geological Survey of Tibet Autonomous Region,Lhasa 850000, China;Key Laboratory of Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;Key Laboratory of Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
| Abstract: | It is generally accepted that the post-collisional potassic and ultrapotassic magmatism are erupted from western to eastern in temporal in Lhasa block of Tibetan Plateau.However,this study has identified the potassic volcanic rocks from the Maqiang area in central of Lhasa block,which formed at ~21.3Ma by 40Ar-39Ar dating.These potassic rocks are geochemical similar to ultrapotassic rocks,e.g.,high in MgO (>3%) and K2O/Na2O (K2O/Na2O>2).The high MgO contents of potassic rocks in studying area caused for lat... |
| Keywords: | Potassic-ultrapotassic volcanic rocks Post-collisional magmatism Temporal distribution Maqiang area Lhasa block |
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