Features of Feldspar Weathering Dissolution in Holocene Volcanic Eruptive Material on the Tianwen Peak Cross Section, Tianchi, Changbaishan and Their Implications

详细信息   

• 责任者：Zhang Bingliang (Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Xu Jiandong
• 刊名：Seismology and Geology
• 出版年：2011
• 卷期：33(1)
• 关键词：全新世 ; Holocene ; 火山喷出物 ; ejecta ; 长白山 ; Changbai Mountains
• 页码：p.15-25
• 图表：5 illus., 1 table, 28 refs.
• 分类号：1400
• issnNo：ISSN0253-4967
• isbnNo：CN11-2192/P

摘要

The authors use SEM and EDX to study the micro structures and chemical compositions of feldspar surface weathering dissolution in Holocene volcanic eruptive material at the Tianwen peak, Tianchi, Changbaishan. The result shows that there are varied micro structures formed by weathering dissolution on feldspar surface in the pumice which is black on the top and turns dark-grey downward on the cross section at the Tianwen peak. It implies that the degree of weathering dissolution on the feldspar surface is correlated with ages of volcanic eruptions. Observations on the microstructure of feldspar surface suggest that the pumice at the Manjiang tree farm and the grey pumice at the Tianwen peak cross section are the product of the same one volcanic eruption.