نتایج جستجو برای: carbonate replacement deposit
تعداد نتایج: 153195 فیلتر نتایج به سال:
Propylene carbonate is shown to be an environmentally friendly and sustainable replacement for dichloromethane and acetonitrile in proline-catalysed a-hydrazinations of aldehydes and ketones. Enantioselectivities comparable to those obtained in conventional solvents or ionic liquids can be obtained, even when using a lower catalyst loading.
A range of crystalline and nano-sized carbonate- and silicate-substituted hydroxyapatite has been successfully produced by using continuous hydrothermal flow synthesis technology. Ion-substituted calcium phosphates are better candidates for bone replacement applications (due to improved bioactivity) as compared to phase-pure hydroxyapatite. Urea was used as a carbonate source for synthesising p...
Upper Jurassic carbonate successions have excellent exposure in Binalud Mountains, west of Bojnurd, northeast and southwest Jajarm area with thickness of about 500m. Chert nodules are present in various shapes such as spherical, elliptical, elongated, discoid and irregular. Silicifications in these deposits are mostly replacement for the carbonate minerals. The presence of carbonate residues in...
abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...
Computer modelling techniques have been employed to qualitatively and quantitatively investigate the uptake and distribution of carbonate groups in the hydroxyapatite lattice. Two substitutional defects are considered: the type-A defect, where the carbonate group is located in the hydroxy channel, and the type-B defect, where the carbonate group is located at the position of a phosphate group. ...
gomish-tappeh zn-pb-cu (ag) deposit is located 90 km southwest of zanjan, in northwestern part of urumieh-dokhtar volcano-plutonic zone. exposed rocks at the area include oligo-miocene volcano-sedimentary and sedimentary sequences as well as pliocene volcano-plutonic sequence (andesite porphyry dykes, dacitic subvolcanic dome and rhyodacitic volcanics). alteration in the deposit developed as si...
The Black Angel Zn-Pb ore deposit is hosted in folded Paleoproterozoic marbles of the Mârmorilik Formation. It exposed southern part steep and inaccessible alpine terrain Rinkian Orogen, central West Greenland. Drill-core data integrated with 3D-photogeology hyperspectral imagery rock face allow us to identify stratigraphic units extract structural information that contains geological setting t...
Nakhlak lead deposit, one of the oldest and largest Iranian lead mines, is located in 55 Km from the northeast of Anarak town. Nakhlak deposit occurs as stratabound and epigenetic in Upper Cretaceous dolomitic carbonates host rocks. The hypogene ore deposits include galena and barite that are associated in supergene zone with cerussite. Galena occurs as coarse and fine grains with replacement a...
Mahour polymetal deposit located west of Nehbandan, east-central Iran, formed in hypabyssal acid rocks. Mineralization occurs along a three-km-long vein. Three zones have observed in the ore, downward: 1) leached zone marked by malachite, azurite, hematite, goethite and limonite, 2) supergene zone characterized by bornite, covellite, and chalcocite, and 3) Hypogene zone containing magnetite, ch...
The Ay Qalasi Pb-Zn (Ag) epithermal deposit is located in the south east of Takab, northwest of Iran and is formd at the Urmia-Dokhtar magmatic belt and the Sanandaj-Sirjan zone intersection. Based on microscopic and EPMA analysis, the composition of this series is tennantite-tetrahedrite. These minerals are mainly replaced in host minerals. The EPMA analysis data show that their chemical compo...
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