Source of volcanic ash in the sediments of Sihailongwan maar lake, NE China, and its significance
文献类型：期刊论文
| 作者 | Guo, ZF; Liu, JQ; Fan, QC; He, HY; Sui, SZ; Chu, GQ; Liu, Q; Negendank, JFW |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2005 |
| 卷号 | 21期号:1页码:251-255 |
| 关键词 | Sihailongwan Maar Lake Volcanic Ash Chemical Composition |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Sihailongwan maar lake is located in the Cenozoic Longgang volcanic field, northeastern China. Sediments of the Sihailongwan maar lake have been sampled by drilling under Chinese-German cooperative project. The sediments have not disturbed during the drilling. The varve was also well preserved in the sediment core of the Sihailongwan maar lake. Volcanic ash was recognized in the sediments of the Sihailongwan maar lake in the Longgang volcanic field of NE China. Volcanic ash studied is located in 70 cm below bottom of the Sihailongwan maar lake. This volcanic ash cannot comprise a continuous tephra layer, which consists of sparse pumice and tephra in the same depth of the sediment core. The particular shape and sharp rim of the volcanic glass shard suggest that the volcanic ash is the result of direct sinking to the bottom of the Sihalongwan maar lake from volcanic eruption rather than one of secondary transportation. Chemical composition of this volcanic ash by electron microprobe analyses shows that SiO2 varies from 74.72% to 76.64%, Al2O3 from 10.22% to 11.53%, TFeO from 3.72% - 4.35%, Na2O from 4.20% - 4.77% and KO from 4.18% - 4.43%. This characteristic suggests that the volcanic ash was derived from rhyolitic lavas rather than basaltic lavas. However, the volcanic rocks distributed in the Longgang volcanic filed consist of basaltic lavas and basaltic pyroclastic, rocks; there is no rhyolite outcropped around the Sihailongwan maar lake. The concentrations of the major element oxides of the volcanic ashes are consistent with those of pumice from Tianchi volcano erupted in 1199 - 1200 AD, which is located to the northeast 200 km of the Sihailongwan, and show considerable differences from those of the volcanic rocks located in the Longgang volcanic field. This feature rules out the possibility that the volcanic ashes interbedded within the sediments of Sihailongwan maar lake were derived from the eruptions of the Longgang volcanic field. In addition, the sparse distribution of the ash in the sediment is consistent with this inference. The volcanic ash was considered to be the product of eruption of Tianchi volcano erupted in 1199 - 1200 AD based on a geochemical comparison between chemical composition of the volcanic ash and those of the Tianchi volcanic rocks erupted in 1199 - 1200 AD. Moreover, the age of the volcanic ash is around 1630 AD to 1085 AD on the basis of the previous C-14 dating of the sediments of the Sihailongwan maar lake, which is consistent with the age (1199 - 1200 AD) of the Tianchi volcano erupted in historical times. This result probably shows that the products erupted from Tianchi volcano occurred in 1199 - 1200 AD reached the Longgang volcanic field. The Sihailongwan maar lake likely is Northwestern boundary of the product from the Tianchi volcano erupted in 1199 - 1200 AD because the volcanic ashes show fine-grained features and low contents in the sediments. The study implies that the magnitude of the Tianchi volcano activity erupted in 1199 - 1200 AD is larger than that of the previous estimation. |
| WOS关键词 | ERUPTION ; IRELAND ; RECORD |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000227476000025 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65750]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Guo, ZF |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.China Seismol Bur, Inst Geol, Beijing 100029, Peoples R China 3.GeoForschungsZentrum, D-14473 Potsdam, Germany |
| 推荐引用方式 GB/T 7714 | Guo, ZF,Liu, JQ,Fan, QC,et al. Source of volcanic ash in the sediments of Sihailongwan maar lake, NE China, and its significance[J]. ACTA PETROLOGICA SINICA,2005,21(1):251-255. |
| APA | Guo, ZF.,Liu, JQ.,Fan, QC.,He, HY.,Sui, SZ.,...&Negendank, JFW.(2005).Source of volcanic ash in the sediments of Sihailongwan maar lake, NE China, and its significance.ACTA PETROLOGICA SINICA,21(1),251-255. |
| MLA | Guo, ZF,et al."Source of volcanic ash in the sediments of Sihailongwan maar lake, NE China, and its significance".ACTA PETROLOGICA SINICA 21.1(2005):251-255. |
入库方式： OAI收割
来源：地质与地球物理研究所
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