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| 青藏高原北羌塘盆地治多地区松赛弄一带火山岩的特征及构造意义 | |
| 引用本文： | 李善平,马海州 陈有顺 王生祖 魏海成 李五福.青藏高原北羌塘盆地治多地区松赛弄一带火山岩的特征及构造意义[J].中国地质,2009,36(1):85-92. |
| 作者姓名： | 李善平 马海州 陈有顺 王生祖 魏海成 李五福 |
| 作者单位： | 1. 中国科学院青海盐湖研究所,青海,西宁,810008;青海省地质调查院,青海,西宁,810012 2. 中国科学院青海盐湖研究所,青海,西宁,810008 3. 青海省地震局,青海,西宁,810006 4. 青海省公路勘察设计院,青海,西宁,810010 5. 青海省地质调查院,青海,西宁,810012 |
| 基金项目： | 中国地质调查局地质大调查项目 |
| 摘 要： | 测区松赛弄晚三叠世-带火山岩为-套酸性-中性-基性火山岩组合,由玄武岩、安山岩、英安岩、流纹岩及少量火山碎屑岩等组成.火山岩中SiO2含量为48.89%～88.15%,平均67.44%,TiO2为0.22%～1.85%,平均0.63%,MgO含量0.23%～7.81%,与岛弧钙碱性火山岩相似;高场强元素Nb、Ta、Zr、Hf、Ti等亏损,大离子亲石元素Rb、Sr、Ba等相对富集,(La/Sm)n为1.79～5.19,LREE/HREE值多数在4.08～6.63,属轻稀土元素富集型,δEu多数在0.47～0.99.铕呈负异常;La/Nb多数大于2.00,Nb/Zr>0.04;Th/Ta>4.41,Th×Ta/Hf2>0.042,具有陆缘火山弧的特性.上述特征表明,羌塘盆地治多地区松赛弄一带晚三叠世火山岩产于大陆碰撞与陆缘弧并存的环境. |
| 关 键 词： | 青藏高原 北羌塘盆地 金沙江缝合带 晚三叠世 火山岩 陆缘弧 |
Characteristics of volcanic rocks in Songsainong of Zhidoi area,North Qiangtang Basin,Qinghai-Tibet Plateau,and their tectonic significance |
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| LI Shan-ping,MA Hai-zhou,CHEN You-Shun,WANG Sheng-Zu,WEI Hai-Cheng,LI Wu-fu.Characteristics of volcanic rocks in Songsainong of Zhidoi area,North Qiangtang Basin,Qinghai-Tibet Plateau,and their tectonic significance[J].Chinese Geology,2009,36(1):85-92. | |
| Authors: | LI Shan-ping MA Hai-zhou CHEN You-Shun WANG Sheng-Zu WEI Hai-Cheng LI Wu-fu |
| Institution: | 1;2;1.Qinghai Institute of Salt Lakes;Chinese Academy of Sciences;Xining 810008;Qinghai;China;2.Qinghai Institute of Geological Survey;Xining 810012;3.Qinghai Seismological Bureau;Xining 810006;4.Qinghai Institute of Highway Survey and Design;Xining 810010;China |
| Abstract: | A set of Late Triassic acid-intermediate-basic volcanic rocks in Songsainong area is composed of basalt,andesite,dacite,rhyolite and a small amount of pyroclastic rocks as well as some other components.In the volcanic rocks,SiO_2 values are in the range of 48.89-88.15%(67.44%on average),TiO_2 vary between 0.22 and 1.85%(0.63%on average),and MgO range from 0.23 to 7.81%,similar to things of island arc calc-alkaline volcanic rocks.High field intensity elements such as Nb,Ta,Zr,Hf and Ti are depleted,large-ion... |
| Keywords: | Qinghai-Tibet Plateau North Qiangtang Basin Jinsha River suture zone Late Triassic volcanic rock epicontinental arc |
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