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AN EXAMPLE TO SEPIOLITE FORMATION IN VOLCANIC BELTS BY HYDROTHERMAL ALTERATION: KIBRISCIK (BOLU) SEPIOLITE OCCURRENCE
Geological mineralogical sepiolite occurrence
2011/11/8
Geological, mineralogical and chemical properties of a sepiolite occurrence, located in the south of K齜r齭c齥 township of Bolu Province, northcentral Turkey, have been investigated in detail, and new mi...
Formation of Allophane and Beidellite During Hydrothermal Alteration of Volcanic Glass Below 200°C
Allophane Amorphous aluminum-silicate coating Experimental alteration Smectite Transitional material Volcanic glass
2011/12/31
Experimental alteration of volcanic glass has been carried out in distilled water at 200°C and 150°C. The formation and transformation processes of alteration products have been examined by scanning e...
Mineralogy and Genesis of Clays in Postmagmatic Alteration Zones, Makurazaki Volcanic Area, Kagoshima Prefecture, Japan
Makurazaki volcanic area Alteration aureoles Mode of occurrence Mineralogical properties Sudoite Tosudite Rectorite
2012/1/4
Two distinct zonal sequences of clay minerals (H- and L-type) were found around silicified rocks in the Makurazaki volcanic area, Kagoshima Prefecture, Japan. The clay mineral sequences from the inner...
Clay Mineralogy, Alteration History, and Economic Geology of the Whitemud Formation, Southern Saskatchewan, Canada
Abrasion Brightness Eastend Formation Frenchman Formation Kaolin Kaolinite Paleosol Whitemud Formation
2012/1/4
The Upper Cretaceous (Maastrichtian) Whitemud Formation is a potentially commercial kaolin deposit located in southern Saskatchewan and southeastern Alberta. The Whitemud Formation contains a lower ka...
Mica Alteration Reactions in Jurassic Reservoir Sandstones from the Haltenbanken Area, Offshore Norway
Alteration Burial diagenesis Chlorite Illite Kaolinite Mica Sandstone
2012/1/5
Petrographic observations indicate that dolomite, siderite, pyrite, Ti oxides, quartz, and K-feldspar formed as by-products of mica alteration during diagenesis of Jurassic reservoir sandstones of the...
Low-Temperature Alteration of Palygorskite to Smectite
Alkaline solution Hydrothermal transformation Palygorskite Smectite X-ray powder diffraction
2012/1/4
The feasibility of transforming palygorskite from two localities to smectite hydrothermally at temperatures ranging from 22° to 160°C was investigated in a series of laboratory experiments, in which a...
LOW-TEMPERATURE ALTERATION OF PALYGORSKITE TO SMECTITE
Alkaline solution Hydrothermal transformation Palygorskite Smectite X-ray powder diffraction
2011/11/11
The feasibility of transforming palygorskite from two localities to smectite hydrothermally at temperatures ranging from 22 ~ to 160"C was investigated in a series of laboratory experiments, in which ...
Diagenetic Alteration of Perlite in the Guryongpo Area, Republic of Korea
Clinoptilolite Diagenesis Dissolution Glass Mordenite Perlite Smectite Zeolite
2011/11/30
Abstract: Perlite, which occurs at the contacts between dacite and lacustrine tuffs of Miocene age in the Guryongpo area, Korea, has undergone more sluggish and incomplete diagenetic alteration than t...
Mechanisms of Palygorskite and Sepiolite Alteration as Deduced from Solid-State 27Al and 29Si Nuclear Magnetic Resonance Spectroscopy
Al coordination Hydrothermal transformation Nuclear magnetic resonance Palygorskite Sepiolite Smectite X-ray powder diffraction
2012/1/6
The mechanisms of palygorskite and sepiolite alteration to smectite under mild hydrothermal conditions were investigated by solid-state 27Al and 29Si magic-angle spinning-nuclear magnetic resonance (M...
Weathering Sequence and Alteration Products in the Genesis of the Graskop Manganese Residua, Republic of South Africa
Birnessite Dolomite Infrared spectroscopy Manganese Nsutite Petrography Wad Weathering X-ray powder diffraction
2012/1/10
Although numerous, small, manganese oxide deposits associated with dolomite in the Eastern Transvaal escarpment, Republic of South Africa, have been known for many years, their mineralogical make-up i...
Kaolinization of Bauxite: A Study of the Vlasenica Bauxite Area, Yugoslavia. II. Alteration of Oolites
Aluminum Bauxite Boehmite Diaspore Kaolinization Oolites
2012/1/10
During the epigenetic alteration of boehmitic karstic bauxite in the Vlasenica region of Yugoslavia, which was caused by siliceous water descending through the deposit by means of cracks, fissures, et...
Alteration of Phlogopite to Corrensite at Sharbot Lake, Ontario
Corrensite Hydrothermal alteration Interstratification Phlogopite
2012/1/10
A low-charge corrensite, i.e., a regular 1:1 interstratified smectite/chlorite was found in veins and fissures of an extensively fractured dolomite south of Perth, Ontario, Canada. Total chemical anal...
Diagenetic Alteration of Silicic Ash in Searles Lake, California
Alkaline Saline lake Anacime Clinoptilolite Diagenesis K-feldspar Merlinoite Phillipsite Volcanic ash Zeolite
2012/1/11
Ash layers from Searles Lake, California, were sampled in core of drill hole KM-3, which penetrated 693 m of lacustrine sediment deposited in a playa-lake complex over the past 3.2 my. Lake water chan...
Kaolinization of Bauxite: A Study in the Vlasenica Bauxite Area, Yugoslavia. I. Alteration of Matrix
Aluminum Bauxite Boehmite Kaolinite Resilification Silica
2012/2/2
The kaolinization of bauxite has generally been thought to be a simple process of epigenetic resilification. A study of the karstic boehmitic bauxites in the Vlasenica region of Yugoslavia, however, s...
Palygorskite and Sepiolite Alteration to Smectite Under Alkaline Conditions
Alteration Analcime Cation-exchange capacity Palygorskite Sepiolite Smectite Sodium hydroxide
2011/11/25
Abstract: The instability of palygorskite and sepiolite under soil conditions was investigated to determine if these fibrous minerals transform directly to smectite under laboratory conditions. The tr...