نتایج جستجو برای: hematite and magnetite
تعداد نتایج: 16829021 فیلتر نتایج به سال:
[1] Water played a major role in the formation and alteration of rocks and soils in the Columbia Hills. The extent of alteration ranges from moderate to extensive. Five distinct rock compositional classes were identified; the order for degree of alteration is Watchtower ffi Clovis > Wishstone ffi Peace > Backstay. The rover’s wheels uncovered one unusual soil (Paso Robles) that is the most S-ri...
Abstract We present the magnetic, structural and 57 Fe Mossbauer characterization of soils collected from an ancient mercury contaminated city named Huancavelica in Peru. The results indicate that silicates carbonates are main mineralogical constituents samples. In addition, Mössbauer spectra at room temperature reveal, presence two components: a magnetic component related to Fe-oxides (magneti...
Slag-containing pastes and concretes were analysed by element-specific synchrotron-based techniques to determine the speciation of iron on crushed materials through spatially resolved micro-spectroscopic studies. The investigated cement samples hydrated either in laboratory, or exposed river sea water. Metallic iron, along with minor proportions sulphide magnetite was detected laboratory sample...
The study of erosive processes is essential to maintain agricultural sustainability, but it is often affected by the limitations and costs of conventional methodologies used. This situation is common worldwide, which has resulted in an increasing interest in developing sediment tracers. Here we provide a general review of diverse sediment tracing approaches and some of the advantages and limita...
The Thermal Emission Spectrometer (TES) instrument on the Mars Global Surveyor (MGS) mission has discovered a remarkable accumulation of crystalline hematite (a-Fe2O3) that covers an area with very sharp boundaries approximately 350 by 350–750 km in size centered near 28S latitude between 08 and 58W longitude (Sinus Meridiani). Crystalline hematite is uniquely identified by the presence of fund...
Magnetite powder (FeO·Fe2O3 or Fe3O4) is obtained by the chemical precipitation method, using FeCl3·6H2O and FeCl2·4H2O as a starting materials in presence of hydrazine N2H4 at temperature 80 °C. X-ray diffraction analysis, infrared spectroscopy, scanning electron microscopy are used for study phase composition morphology synthesized powder. Its specific surface area magnetic properties such as...
In the southeast of Iran, titaniferous magnetite deposits associated with the gabbro rocks occur in Kahnuj ophiolitic complex. Mineraloghraphy studies have revealed the primary and secondary ore mineral consist of titanomagnetite, ilmenite, hematite, goethite, martite, pyrite, chalcopyrite, pyrrhotite and silicate minerals (plagioclase, pyroxene, hornblende, olivine, alkali feldspar). Trellis-s...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید