Arid
DOI10.1007/s12633-018-9998-6
The Chemistry of Allanite - Britholite Single Crystal in Alkaline Volcanic Rocks, from Gabal Umm Shaghir Area, Central Eastern Desert, Egypts
Shalaby, B. N. A.; Ismail, A. I. M.; Salem, A. K. A.
通讯作者Ismail, A. I. M.
来源期刊SILICON
ISSN1876-990X
EISSN1876-9918
出版年2019
卷号11期号:4页码:1809-1816
英文摘要The present study deals with the mineral chemistry and genesis of two rare earth elements bearing silicate minerals, namely; allanite and britholite, co-existing in a single crystal, encountered in quartz trachyte dyke, considered to be an offshoot from Gabal Umm Shaghir trachytic plug, central Eastern Desert of Egypt. The size of present allanite-britholite crystal is about 0.25 mm in length and 0.10 mm in width. The allanite phase occupies the main bulk of the crystal, while the britholite phase, exits in the form of transversal spine-shaped lamellae. The mineral chemistry and the genesis of the present allanite - britholite phases are discussed based on 10 scanning electron microprobe point analyses. The present study also discuses, through elemental mapping, the distribution and concentration of selected 9 elements; Si, Fe, Mg, Al, Na, Ca, P, La and Ce, and their frequencies between different mineral phases. The average structural formula of present allanite based on 12.5 (O2-) and 8 cations is: (Ca2+)(1.00) (Ce0.343+\, La0.193+, Nd0.143+, Sm0.023+, Y0.113+, Ca0.252+)1.05\ (Mg0.072+, Fe0.692+, Fe0.193+)0.95 (Ti0.024+, Fe0.133+, Al0.853+)1.00 (Al3+)(1.00) (Si4+)(2.99) (O2-)(12.5). The average structural formula of present britholite based on 12.5 (O2-) and 8 cations is: (Ca1.732+, K0.05,+Mg0.102+, Fe0.222+, Ti0.01,4+Al0.14,3+ La0.503+, Ce1.193+, Nd0.443+, Sm0.103+, Y0.50,3+Th0.014+)5.00 (Al0.123+, P0.395+, Si2.494+)3.00 (O-2)(12.5). The present study concluded that, the coexistence of britholite - allanite mineral phases were resulted from rare earth elements (REEs) + P enriched hydrothermal solutions, undergone percolation and attacking the allanite crystal along cleavage planes. The reaction processes involved, essentially, substitution of P2O5 and REEs2O3 for Al2O3 and SiO2.
英文关键词Allanite Britholite Rare earth elements Alkaline rocks Trachyte
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000486225200012
WOS关键词NOMENCLATURE ; MINERALS
WOS类目Chemistry, Physical ; Materials Science, Multidisciplinary
WOS研究方向Chemistry ; Materials Science
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/218850
作者单位Natl Res Ctr, Geol Sci Dept, PO 12622,33 El Bohooth St, Giza, Egypt
推荐引用方式
GB/T 7714
Shalaby, B. N. A.,Ismail, A. I. M.,Salem, A. K. A.. The Chemistry of Allanite - Britholite Single Crystal in Alkaline Volcanic Rocks, from Gabal Umm Shaghir Area, Central Eastern Desert, Egypts[J],2019,11(4):1809-1816.
APA Shalaby, B. N. A.,Ismail, A. I. M.,&Salem, A. K. A..(2019).The Chemistry of Allanite - Britholite Single Crystal in Alkaline Volcanic Rocks, from Gabal Umm Shaghir Area, Central Eastern Desert, Egypts.SILICON,11(4),1809-1816.
MLA Shalaby, B. N. A.,et al."The Chemistry of Allanite - Britholite Single Crystal in Alkaline Volcanic Rocks, from Gabal Umm Shaghir Area, Central Eastern Desert, Egypts".SILICON 11.4(2019):1809-1816.
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