The eruption trigger of the dacitic magma in Tengchong during the Middle Pleistocene
文献类型：期刊论文
| 作者 | Ding LeiLei1,2; Liu JiaQi1,2; Guo ZhengFu1,2; Zhang Lei1,2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2018 |
| 卷号 | 34期号:1页码:113-125 |
| 关键词 | Tengchong Dacite Magma chamber Magma mixing Eruption trigger |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Temporal-spatial and physical-chemical conditions of pre-eruption magma chamber are vital factors to unravel the eruption mechanism. In this study, we carry out high-resolution geochronological dating for volcanic rocks collected from Mazhan Drilling Core, Tengchong, China. Zircons of dacites are euhedral to semi-euhedral with clear oscillatory zoning which may imply a magmatic origin. Dating of zircons gets a result of similar to 0.7Ma, with a Middle Pleistocene overlying layer, which means the eruption happened at the Middle Pleistocene. Geochemistry of dacites shows high potassic calc-alkaline affinity. Dacites in Drilling Core could be divided into an upper part and the lower part based on the existence of amphibole. Amphibole bearing dacites in the upper part with mineral assemblages: Cpx + Opx + Pl + Il + Mag. Some augite crystals are rimmed by enstatite and pigeonite, and lower An plagioclase are rimmed by higher An value, which are all suggest that mafic magma injected into the magma chamber before the eruption; Pyroxene bearing dacites from lower part with mineral assemblages: Cpx + Opx + Pl + Kf + Bi + Il + Mag + Q. The increased temperature and pressure of plagioclase with lower An value show that silicic magma injected into the magma chamber before the eruption. Furthermore, the dacites from two layers have the similarity of bulk compositional and mineral core composition indicate these two different dacites initially from one mamga chamber, but experience two separate composition mamga injection event. The mamga injection induced the instability of the magma chamber, which is the direct cause of this eruption. |
| WOS关键词 | PLAGIOCLASE PHENOCRYSTS ; VOLCANIC-ERUPTIONS ; DYNAMICS ; SYSTEM ; FE ; VESICULATION ; CONSTRAINTS ; BAROMETER ; PROFILES ; PRODUCTS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000424882800011 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/82679]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Liu JiaQi |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ding LeiLei,Liu JiaQi,Guo ZhengFu,et al. The eruption trigger of the dacitic magma in Tengchong during the Middle Pleistocene[J]. ACTA PETROLOGICA SINICA,2018,34(1):113-125. |
| APA | Ding LeiLei,Liu JiaQi,Guo ZhengFu,&Zhang Lei.(2018).The eruption trigger of the dacitic magma in Tengchong during the Middle Pleistocene.ACTA PETROLOGICA SINICA,34(1),113-125. |
| MLA | Ding LeiLei,et al."The eruption trigger of the dacitic magma in Tengchong during the Middle Pleistocene".ACTA PETROLOGICA SINICA 34.1(2018):113-125. |
入库方式： OAI收割
来源：地质与地球物理研究所
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