| 西藏桑日县马门晚白垩世O型埃达克岩年代学、地球化学及构造意义 |
| |
| 引用本文： | 姚兴华,张志平,汪宏涛,王晓东,晏齐胜,包国志.西藏桑日县马门晚白垩世O型埃达克岩年代学、地球化学及构造意义[J].矿产勘查,2019(6):1327-1338. |
| |
| 作者姓名： | 姚兴华 张志平 汪宏涛 王晓东 晏齐胜 包国志 |
| |
| 作者单位： | 甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050,甘肃省地质矿产勘查开发局第三地质矿产勘查院,兰州 730050 |
| |
| 基金项目： | 中国地质调查局项目(编号:121201010000150014-46、DD20160015-08)资助。 |
| |
| 摘 要： | 通过对出露于桑日县马门一带的火山岩开展全岩地球化学、锆石U-Pb年代学、Sr-Nd同位素研究,结果表明马门火山岩形成于90. 24±0. 41Ma,高Si O_2(56. 11%~71. 36%)、Al_2O_3(14. 27%~16. 06%)、Na_2O(2. 80~4. 93)、Sr(327. 24~969. 15),低Y(8. 16~14. 54)、Yb(0. 88~1. 271. 9)及高Sr/Y比值(27. 87~72. 98)为特征,显示O型埃达克岩地球化学特征。岩石属钙碱性系列,富集LREE、亏损HREE,富集大离子亲石元素Rb、K、Ba,亏损高场强元素Nb、Ti、P,无明显负Eu异常,Sr、Nd同位素较一致,εNd0,表明源区以俯冲洋壳为主,并可能卷入了少量俯冲富硅沉积物。通过与南冈底斯埃达克岩对比,认为马门火山岩可能是新特提斯洋脊俯冲背景下,由俯冲消减的新特提斯洋壳上部部分熔融形成,源区可能还卷入了少量俯冲富硅沉积物。
|
| 关 键 词： | O型埃达克岩 马门 晚白垩世 地球化学 洋脊俯冲 |
| 收稿时间： | 2019/1/10 0:00:00 |
Chronology, geochemistry and tectonic Significance of Late Cretaceous O-Type Adakite in Mamen, Sangri County, Tibet |
| |
| YAO Xing-hu,ZHANG Zhi-ping,WANG Hong-tao,WANG Xiao-dong,YAN Qi-sheng and BAO Guo-zhi.Chronology, geochemistry and tectonic Significance of Late Cretaceous O-Type Adakite in Mamen, Sangri County, Tibet[J].Mineral Exploration,2019(6):1327-1338. |
| |
| Authors: | YAO Xing-hu ZHANG Zhi-ping WANG Hong-tao WANG Xiao-dong YAN Qi-sheng and BAO Guo-zhi |
| |
| Affiliation: | The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050,The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050 and The Third Institute of Geology and Minerals Exploration, Gansu Provincial Bureau of Geology and Minerals Exploration and Development, Lanzhou 730050 |
| |
| Abstract: | |
| |
| Keywords: | O-type adakite Mamen late Cretaceous geochemistry ridge subduction |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《矿产勘查》浏览原始摘要信息 |
|
点击此处可从《矿产勘查》下载全文 |
|
