| 天池天文峰全新世火山喷发物长石表面硅膜特征及意义 |
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| 引用本文： | 张秉良.天池天文峰全新世火山喷发物长石表面硅膜特征及意义[J].地质学报,2011,85(6):947-954. |
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| 作者姓名： | 张秉良 |
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| 作者单位： | 1. 中国地震局地质研究所,北京,100029
2. 吉林省地震局,长春,130022 |
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| 基金项目： | 国家自然科学基金项目(编号40772128); 中国地震局行业专项(编号20070827)共同资助成果 |
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| 摘 要： | 利用扫描电镜和能谱分析研究天池火山天文峰剖面全新世喷发物中长石表面硅膜的结构状态和化学组成,结果显示:天文峰剖面从顶部黑色浮岩向下到暗灰色浮岩中,长石表面发育有不同结构状态的硅膜.硅膜的结构特征有随火山喷发时代越早,长石颗粒表面硅膜越厚,结构越复杂；喷发时代越晚,长石颗粒表面硅膜越薄,其结构越简单的变化趋势,即长石表面...
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| 关 键 词： | 天池火山 硅膜 扫描电镜 显微结构 化学组成 |
| 收稿时间： | 4/29/2010 6:05:20 PM |
| 修稿时间： | 3/30/2011 2:36:08 PM |
Features of feldspar surface silica glazes on Holocene volcanic eruptive material at the Tianwen peak, Tianchi, Changbai Shan and their implications |
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| zhangbingliang.Features of feldspar surface silica glazes on Holocene volcanic eruptive material at the Tianwen peak, Tianchi, Changbai Shan and their implications[J].Acta Geologica Sinica,2011,85(6):947-954. |
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| Authors: | zhangbingliang |
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| Institution: | Institute of Geology, China Earthquake Administration |
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| Abstract: | We use SEM and EDX to study the structures and chemical compositions of feldspar surface silica glaze on Holocene volcanic eruptive material at the Tianwen peak, Tianchi, Changbai Shan. The result shows that there are silica glazes of varied structures formed on feldspar surface in the pumice that is black on the top and turns dark-grey downward on the cross section at the Tianwen peak. Their structural features depend on ages of volcanic eruption. Thick and complicated glazes are present on the pumice erupted earlier, while thin and simple glazes occur on the pumice generated later. It means that the form and thickness of glazes on feldspar surface are correlated with the time of volcanic eruption. These glazes are made up of Si (33.3~26.6%), Al (9.28~6.22%), Na (6.08~4.07%), K (3.84~2.35%) and Fe (3.82~1.64%). With increasing Si, the content of Al and Na tend to decrease, while that of K and Fe changes little. Such a composition indicates that the glaze resulted from deposits of dissolved silicate. And the correlation between the elements is analogue to that of the glaze rich in fragment determined by Dorn in 1998. The features of these structure and compositions are associated with the processes of rock weathering, migration and final deposit. And existence of element Fe is probably related with microorganism. Rock weathering, wore grain and dissolved ion provide the glaze formation with material sources. The detailed observations on glazes may be a new approach to study post-volcanic eruption settings and temporal process of volcanic eruptions from microstructures of rocks. |
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| Keywords: | Tianchi volcano silica glaze SEM microstructure chemical composition |
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