In this study, dielectric properties within 8-12 GHz microwave frequencies, inductively coupled plasma-atomic emis- sion spectrometry, Fourier transform infrared spectrometry, synchronized two thermal analyses, and 57...In this study, dielectric properties within 8-12 GHz microwave frequencies, inductively coupled plasma-atomic emis- sion spectrometry, Fourier transform infrared spectrometry, synchronized two thermal analyses, and 57Fe Mossbauer spectroscopy analysis of chalcedony, agate, and zultanite samples from Turkey are presented. Agate and chalcedony show the same nine vibrational absorption peaks obtained unlike zultanite from FTIR spectra in the 350 cm-1 to 4000 cm-1 range, ε＇ values of chalcedony, agate and zultanite derived at 10.5 GHz were 4.67, 4.41, and 7.34, respectively, eI and e~ values of the studied samples at the microwave frequencies are related to the percentage weight of their constituent parts in their chemical compositions. 57Fe Mossbauer spectroscopy results confirm the existence of iron-containing islands in the crystal structure of zultanite, agate, and chalcedony samples, equipped them with magnetic features typical for magnetic nanoparticles including superparamagnetism. The presence of iron-containing islands significantly affects the magnetic, dielectric, and optical properties of studied samples that are not observed for pure minerals without any foreign inclusions.展开更多
The monazite deposit at Andoharano is 7 km NE of Ambatofinandrahana.It is in the form of filons of hydrothermal chalcedony origin both with monazite and barite,which intersects the small syenitic post-tectonic massif,...The monazite deposit at Andoharano is 7 km NE of Ambatofinandrahana.It is in the form of filons of hydrothermal chalcedony origin both with monazite and barite,which intersects the small syenitic post-tectonic massif,aged 550 to 510 Ma.The syenite is part of the Ambalavao-Kiangara-Maevaranomagmatic suite located in the Itremo sub-domain.The mineralized filon’s length is approximately 100 meters with an average thickness of 2 to 5 meters,direction N75 and a subvertical dip.It is characterized by the mineralogical association of monazite,chalcedony,barite,quartz and magnetite.Two deformation phases affect the emplacement of the deposit.The first phase corresponds to the crystallization of the automorphic monazites,while the second phase affects the filon which leads to the fracturing of the first through silicification and which leads to the formation of the small xenomorphic monazite crystals.The monazite appears as brownish spots scattered in the rocks.It is rich in ceric earth(32%to 33%)and low in thorium.It constitutes ceric earth ore in the region.展开更多
基金supported by the Project LO1305 and Operational Program Education for Competitiveness-European Social Fund of the Ministry of Education,Youth and Sports of the Czech Republic(Grant No.CZ.1.07/2.3.00/20.0155)the Internal Student Grant IGA of Palacky University in Olomouc,Czech Republic(Grant No.IGA PrF 2014017)
文摘In this study, dielectric properties within 8-12 GHz microwave frequencies, inductively coupled plasma-atomic emis- sion spectrometry, Fourier transform infrared spectrometry, synchronized two thermal analyses, and 57Fe Mossbauer spectroscopy analysis of chalcedony, agate, and zultanite samples from Turkey are presented. Agate and chalcedony show the same nine vibrational absorption peaks obtained unlike zultanite from FTIR spectra in the 350 cm-1 to 4000 cm-1 range, ε＇ values of chalcedony, agate and zultanite derived at 10.5 GHz were 4.67, 4.41, and 7.34, respectively, eI and e~ values of the studied samples at the microwave frequencies are related to the percentage weight of their constituent parts in their chemical compositions. 57Fe Mossbauer spectroscopy results confirm the existence of iron-containing islands in the crystal structure of zultanite, agate, and chalcedony samples, equipped them with magnetic features typical for magnetic nanoparticles including superparamagnetism. The presence of iron-containing islands significantly affects the magnetic, dielectric, and optical properties of studied samples that are not observed for pure minerals without any foreign inclusions.
文摘The monazite deposit at Andoharano is 7 km NE of Ambatofinandrahana.It is in the form of filons of hydrothermal chalcedony origin both with monazite and barite,which intersects the small syenitic post-tectonic massif,aged 550 to 510 Ma.The syenite is part of the Ambalavao-Kiangara-Maevaranomagmatic suite located in the Itremo sub-domain.The mineralized filon’s length is approximately 100 meters with an average thickness of 2 to 5 meters,direction N75 and a subvertical dip.It is characterized by the mineralogical association of monazite,chalcedony,barite,quartz and magnetite.Two deformation phases affect the emplacement of the deposit.The first phase corresponds to the crystallization of the automorphic monazites,while the second phase affects the filon which leads to the fracturing of the first through silicification and which leads to the formation of the small xenomorphic monazite crystals.The monazite appears as brownish spots scattered in the rocks.It is rich in ceric earth(32%to 33%)and low in thorium.It constitutes ceric earth ore in the region.
