| 冈底斯西段第四纪钾质火山岩的发现及赛利普组的建立 |
| |
| 引用本文： | 马润则,刘登忠,陶晓风,胡新伟,赵兵.冈底斯西段第四纪钾质火山岩的发现及赛利普组的建立[J].成都理工学院学报,2008,35(1):87-92. |
| |
| 作者姓名： | 马润则 刘登忠 陶晓风 胡新伟 赵兵 |
| |
| 作者单位： | 成都理工大学地球科学学院,成都610059 |
| |
| 基金项目： | 中国地质调查局1：250000赛利普幅地质调查
项目本文为1：250000赛利普幅区域地质调查的集体成果之一,感谢对项目作出贡献的相关单位及所有人员! |
| |
| 摘 要： | 冈底斯西段赛利普一带分布有大面积的钾质火山岩，以前曾被划归上新世一早更新世赛利普群。作者对这套火山岩地层进行了详细野外调查并重新测制了火山岩地层剖面，在该套火山岩下伏及层间湖相碎屑沉积层中获得ESR年龄0．268Ma与0．349Ma。岩石学、岩石化学研究表明，这套火山岩是以安粗质熔岩为主的钾玄岩系列一钾质碱性玄武岩系列火山岩，岩石类型及岩石组合稳定，岩层产状平缓，岩石新鲜，层位相对清楚，故将其命名为赛利普组，属第四纪早一中更新世。这一发现对研究冈底斯构造带新生代以来岩浆活动、构造演化，进而探讨青藏高原隆升机制有着重要的地质意义。
|
| 关 键 词： | 西藏 冈底斯西段 第四纪 钾质火山岩 赛利普组 |
| 文章编号： | 1671-9727（2008）01-0087-06 |
| 收稿时间： | 2006-09-12 |
Discovery of Quaternary potassic volcanic rocks and the establishment of Sailipu Formation in West Gangdis of Tibet, China |
| |
| MA Run-ze, TAO Xiao-feng, LIU Deng-zhong, HU Xin-wei, ZHAO Bin.Discovery of Quaternary potassic volcanic rocks and the establishment of Sailipu Formation in West Gangdis of Tibet, China[J].Journal of Chengdu University of Technology,2008,35(1):87-92. |
| |
| Authors: | MA Run-ze TAO Xiao-feng LIU Deng-zhong HU Xin-wei ZHAO Bin |
| |
| Abstract: | Large area of potassic volcanic rocks distributed over the Sailipu area of West Gangdis were originally assigned to the Sailipu Group and the age was Pliocene-Early Pleistocene. The volcanic stratum has been investigated in detail and a section of the volcanic rocks has been remeasured by the authors. The ESR ages of 0. 268 Ma and 0. 349 Ma are obtained from the lake sandy gravel under the volcanic layer. Studies of petrology and petrochemistry indicate that such suit of volcanic rocks dominated by lattite belongs to shoshonite series to potassic alkali basalt series. Considering the stability of rocks and their associations, gentle stratum occurrence, fresh degree of rocks and comparatively clarity of horizons, this potassic volcanic stratum distributed over the Sailipu area is named as Sailipu Formation, and the age of which is early-middle Pleistocene of Quaternary. This discovery provides important evidences for the Cenozoic magmatism and tectonic evolution of the Gangdis belt, and is significant for the further study of uplifting mechanism of Qinghai-Tibet Plateau. |
| |
| Keywords: | Tibet Gangdis Quaternary potassic volcanic rocks Sailipu Formation |
| 本文献已被 维普 等数据库收录！ |
|
