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Silicate minerals

About: Silicate minerals is a research topic. Over the lifetime, 1794 publications have been published within this topic receiving 67064 citations.


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Journal ArticleDOI
TL;DR: The oxygen and hydrogen isotope composition of hydrothermal fluids associated with the Variscan granites of southwest England has been inferred from analysis of various silicate minerals (predominantly quartz) and by direct analysis of fluid inclusions within quartz and fluorite as mentioned in this paper.
Abstract: The oxygen and hydrogen isotope composition of hydrothermal fluids associated with the Variscan granites of southwest England has been inferred from analysis of various silicate minerals (predominantly quartz) and by direct analysis of fluid inclusions within quartz and fluorite. These data have been combined with the results of a fluid inclusion study to develop a model for the origin and evolution of hydrothermal fluids in the region. Magmatic fluids expelled from the granites had compositions in the range 6D = -65 to -15%o, and 6180 = 9 to 13%o. Respective temperature, salinity, fluid 6D, and fluid 8180 values for the (i) early Sn-W mineralization, (ii) later Cu-Pb-Zn sulphide mineralization, and (iii) latest 'crosscourse' Pb-Zn-F mineralization are: (i) 230-400 ~ 5-15 wt.% NaC1 equiv,, -39 to -16%o, and 7.0 to 11.2%o, (ii) 220-300 ~ mostly 2-8 wt.% NaC1 equiv., -41 to -9%0, and 2.3 to 8.1%o, and (iii) 110-150~ 22-26 wt.% NaC1 equiv., -45 to +2%0, and -1.8 to +5.5%o. These data highlight the important role of both magmatic fluids exsolved from the crystallizing granite, and basinal brines circulating within restricted fracture systems.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the partial charges on Si atoms in silicate and aluminosilicate anionic structures were calculated and a correlation between the Si atom partial charge and its experimentally observed chemical shift assists in the assignment of {sup 29}Si NMR peaks due to soluble anions.
Abstract: {sup 29}Si and {sup 27}Al spectroscopies were used to characterize dilute, highly alkaline tetrapropylammonium (TPA) aluminosilicate solutions. The solution compositions ranged from 0.1 to 2 mol % SiO{sub 2}, silicate ratios (R = (SiO{sub 2})/((TPA){sub 2}O)) from 0.05 to 1, and Si/Al molar ratios from 0.25 to 5. {sup 29}Si NMR resonances were observed for Al incorporation into the dimer, linear trimer, cyclic trimer, branched cyclic trimer, double three-membered ring (D3R), and double four-membered ring (D4R) anions. In aluminosilicate solutions with 2 mol % SiO{sub 2}, silicate ratios of less than 1.5 lead to the stabilization of D3R(1Al) anions. The addition of DMSO to TPA aluminosilicate solutions provides the solutions with a high concentration of D3R(1Al) and D4R(1Al) anions. Semiempirical quantum mechanical calculations were performed to calculate the partial charges on Si atoms in silicate and aluminosilicate anionic structures. A correlation between the Si atom partial charge and its experimentally observed chemical shift assists in the assignment of {sup 29}Si NMR peaks due to soluble aluminosilicates.

28 citations

Journal ArticleDOI
TL;DR: In this article, the authors highlight the preparation of exfoliated silicate minerals, including physical, chemical, mixed physical and chemical methods, and summarize the important influential factors for exfoliation.
Abstract: Exfoliated silicate minerals have attracted great attentions because of the dramatic improvement in properties This paper highlights the preparation of exfoliated silicate minerals, including physical, chemical, mixed physical and chemical methods The mechanisms by which silicates are exfoliated and the important influential factors are also summarized Finally, the instrumental techniques to characterize the exfoliated structure and exfoliation degree are presented

28 citations

Journal ArticleDOI
TL;DR: In this paper, aluminum was used to categorize these various mineral deposits and the abundance of aluminum and accumulations of Nb, Zr, Ti, REE, Sr and Ba point to similar subcrustal carbonatite-forming systems that were operative during periods of the Precambrian and the Mesozoic in Malawi.

28 citations

Dissertation
21 Jun 2007
TL;DR: In this article, the authors used forsterite as a model system to identify the important factors that affect silicate mineral dissolution rates and grain lifetimes in the weathering environment.
Abstract: Silicate minerals are the most common mineral group in the earth’s crust so it is not surprising that their weathering reactions dominate the chemistry of many earth surface processes. This project used forsterite as a model system to identify the important factors that affect silicate mineral dissolution rates and grain lifetimes in the weathering environment. I determined an empirical rate law for forsterite dissolution of forsterite in oxalic

28 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202344
202264
202153
202064
201951
201865