DOI: 10.1007/s00531-015-1244-5
Scopus记录号: 2-s2.0-84945439499
论文题名: Natural glass from Deccan volcanic province: an analogue for radioactive waste form
作者: Rani N. ; Shrivastava J.P. ; Bajpai R.K.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期: 8 起始页码: 2163
结束页码: 2177
语种: 英语
英文关键词: Alteration
; Clay mineralogy
; Hydrothermal-like conditions
; Microtexture
; Obsidian
; Secondary layers
Scopus关键词: clay mineral
; Deccan Traps
; hydrothermal alteration
; illite
; magmatic differentiation
; montmorillonite
; obsidian
; paragenesis
; radioactive waste
; scanning electron microscopy
; smectite
; texture
英文摘要: Deccan basaltic glass is associated with the differentiation centres of the vast basaltic magmas erupted in a short time span. Its suitability as a radioactive waste containment chiefly depends on alteration behaviour; however, detailed work is needed on this glass. Therefore, the basaltic glass was treated under hydrothermal-like conditions and then studied to understand its alteration. Moreover, comparison of these results with the naturally altered glass is also documented in this paper. Solutions as well as residue obtained after glass alteration experiments were analysed. Treated glass specimens show partial to complete release of all the ions during alteration; however, abundant release of Si and Na ions is noticed in case of almost all the specimens and the ionic release is of the order of Na > Si > K > Ca > Al = Mg > Fe > Mn > Ti. Scanning electron images of the altered residue show morphologies of smectite, montmorillonite and illite inside as well as outside of the secondary layers, and represent paragenesis of alteration minerals. It has been noticed that the octahedral cation occupancies of smectite are consistent with the dioctahedral smectite. The secondary layer composition indicates retention for Si, Al, and Mg ions, indicating their fixation in the alteration products, but remarkably high retention of Ti, Mn and Fe ions suggests release of very small amount of these elements into the solution. By evolution of the secondary layer and retention of less soluble ions, the obstructive effect of the secondary layer increases and the initial constant release rate begins slowly to diminish with the proceeding time. It has been found that devitrification of glass along the cracks, formation of spherulite-like structures and formation of yellowish brown palagonite, chlorite, calcite, zeolite and finally white coloured clays yielded after experiments that largely correspond to altered obsidian that existed in the natural environment since inception ~66 Ma ago. © 2015, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945439499&doi=10.1007%2fs00531-015-1244-5&partnerID=40&md5=e31a4842782e73f5fcb1c1104ca95df1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70228
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Geology, University of Delhi, Delhi, India; BETDD, Nuclear Recycle Group, BARC, Mumbai, India
Recommended Citation:
Rani N.,Shrivastava J.P.,Bajpai R.K.. Natural glass from Deccan volcanic province: an analogue for radioactive waste form[J]. International Journal of Earth Sciences,2015-01-01,104(8)