| 腾冲火山区上新世以来的火山活动 |
| |
| 引用本文： | 李大明,李齐.腾冲火山区上新世以来的火山活动[J].岩石学报,2000,16(3):362-370. |
| |
| 作者姓名： | 李大明 李齐 |
| |
| 作者单位： | 中国地震局地质研究所,北京,100029 |
| |
| 基金项目： | 中国地震局“九五”重点项目 (95 -11)的资助 |
| |
| 摘 要： | 对腾冲火山区上新世以来的火山,尤其是具有最新活动的黑空山、打鹰山和鞍山进行了比较系统的Ｋ－年龄分析。去除样品中含有过剩氩的斜长石斑晶和橄榄石斑晶以后获得了一系列准确的基质Ｋ－Ａｒ年龄;根据火山活动的时空变化把腾冲火山活动分为三个期。第一期为上新世晚期,火山活动集中于火山区的西北和东南两端;第二期为早更新世期间,火山活动向腾冲盆地中心迁移和扩展,活动规模和分布面积最大;第三期为早更新世末期至全新世,
|
| 关 键 词： | 腾冲 火山活动 上新世 钾－氩年龄 |
Volcanic
activities in the Tengchong volcano area since Pliocene |
| |
| Li Daming,Li Qi and Chen Wenji.Volcanic
activities in the Tengchong volcano area since Pliocene[J].Acta Petrologica Sinica,2000,16(3):362-370. |
| |
| Authors: | Li Daming Li Qi and Chen Wenji |
| |
| Institution: | Li Daming,Li Qi and Chen Wenji.Institute of Geology,China Seismological Bureau,Beijing,China. |
| |
| Abstract: | Systematic K-Ar Dating has been yielded
for Pliocene-Recent volcanic eruptions in the Tengchong volcano area, mainly for latest
eruptions of Heikongshan, Dayingshan and Maanshan craters. After distignishing
plagioclase-phenocryst and olivine-phenocryst with excess argon from samples, a series age
of the matrix of volcanic rocks has been obtained. From time-space exchanges and
distribution, the activities of the Tengchong volcano could be divided into three stages.
The first stage developed in the late Pliocene, when the volcanic eruptions occurred in
southeastern and northwestern ends of the Tengchong volcano area. The second stage
experienced in the early Pleistocene suggests that the volcanic activities were migrated
and transferred to central areas of the basin. At this stage, volcanic scale and
distribution were largest compared with that in other stages. The third stage occurred
during the early Pleistocene-Holocene. During the late of Early Pleistocene-Middle
Pleistocene, volcanic scales were decreased, and mainly distributed on a NS-trending belt
in the center of the Tengchong basin. Since late Pleistocene, the volcanic activities have
been focused on Heikongshan, Dayingshan, and Maanshan areas. There was volcanic activity
in Maanshan area in the Holocene. The third volcanic stage is characterized as from
central-northern to southern parts, it qets younger and younger. This means that the
volcanic activities are transferred from north to south. |
| |
| Keywords: | Tengchong Volcanic activity K-Ar dating Excess argon |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《岩石学报》浏览原始摘要信息 |
| 点击此处可从《岩石学报》下载免费的PDF全文 |
|
