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MINERALOGY AND ORIGIN OF CLAY MINERALS, SILICA AND AUTHIGENIC SILICATES IN LEG 14 SEDIMENTS
CLAY MINERALS AUTHIGENIC SILICATES MINERALOGY
2011/11/11
Preliminary X-ray, SEM, TEM, and optical mineralogical results are reported to discuss the paragenesis, age distribution,and origin of clay minerals, silica modifications and authigenic silicates foun...
Abiogenic,microbial and hybrid authigenic crusts:components of Precambrian stromatolites
Archaean carbonate microbial Proterozoic stromatolite thrombolite
2009/12/7
Authigenic seafloor carbonate crusts include fenestrate microbialite, thrombolite, and four types here designated Fine-grained Crust, Sparry Crust, Hybrid Sparry Fine-grained Crust, and Sparry Crust p...
Authigenic Phyllosilicates in the Middle Triassic Kremikovtsi Sedimentary Exhalative Siderite Iron Formation, Western Balkan, Bulgaria
Barite Berthierine Carbonate-hosted Chamosite Illite-smectite Iron Formation Kaolinite SEDEX Siderite
2011/12/5
Abstract: Two distinct assemblages of authigenic phyllosilicates were distinguished in the Kremikovtsi sedimentary exhalative (SEDEX) siderite iron formation (SIF) and noted as important tracers of tw...
Authigenic Illite and Organic Matter: The Principal Hosts of Vanadium in the Mecca Quarry Shale at Velpen, Indiana
Black Shale Illite Mecca Quarry Organic Matter Vanadium
2011/12/6
Abstract: The Mecca Quarry Shale Member from Velpen, Indiana contains abundant vanadium which occurs in solid solution within illite-rich illite-smectite (I-S) having an average content of 1.65 wt. % ...
Cathodoluminescence of quartz from sandstones: Interpretation of the UV range by determination of trace element distributions and fluid-inclusion P-T-X properties in authigenic
Cathodoluminescence quartz sandstones Interpretation UV range determination trace element distributions fluid-inclusion P-T-X properties authigenic
2012/4/6
Quartz overgrowths from Keuper sandstones of the Paris basin wereexamined using cathodoluminescence (CL) microscopy and spectroscopy coupled witha scanning electron microscope (SEM). Withthe use ofsta...
Relation between Interlayer Composition of Authigenic Smectite, Mineral Assemblages, I/S Reaction Rate and Fluid Composition in Silicic Ash of the Nankai Trough
Chemical Controls Glass Alteration Illite/Smectite Interlayer Cations Porewater Composition Precursor Clay Minerals Silicic Ash Smectite
2011/12/27
Abstract: The compositions, fabrics and structures of authigenic minerals that formed recently from silicic volcanic ash layers from a 1300-meter sediment column obtained at ODP Site 808 of the Nankai...
Formation of Authigenic Illite in Palaeocene Mudrocks from the Central North Sea: A Study by High Resolution Electron Microscopy
Authigenic illite High resolution electron microscopy Illite-smectite
2011/12/28
The mode of growth of authigenic, lath-shaped illitic particles has been investigated using field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HR...
40Ar/39Ar Analyses of Authigenic Muscovite, Timing of Stylolitization, and Implications for Pressure Solution Mechanisms: Jurassic Norphlet Formation, Offshore Alabama
40Ar/39Ar dating Muscovite Norphlet Formation Pressure solution Quartz cement Sandstone Stylolites
2011/12/29
Three authigenic muscovite morphologies are associated with Norphlet Formation stylolitization observed in the Texaco Mobile Area Block 872 #1 well: 1)large crystals of 1M muscovite, which grew in the...
Experimental Determination of the Rates of Precipitation of Authigenic Illite and Kaolinite in the Presence of Aqueous Oxalate and Comparison to the K/Ar Ages of Authigenic Illite in Reservoir Sandstones
Illite Kaolinite Precipitation rate Oxalate K/Ar Sandstones North Sea
2011/12/29
The importance of precipitation rate as an effective control on illite and kaolanite formation during diagenesis has been examined by measuring precipitation rates, from Al fluid concentration, in a D...
Occurrence and Palaeohydrological Significance of Authigenic Kaolinite in the Aldebaran Sandstone, Denison Trough, Queensland, Australia
Aquifer Diagenesis Kaolinite Petrography Secondary porosity Stable isotope analysis
2011/12/30
Thin section, XRD, SEM, and isotopic techniques have been used to study authigenic kaolinite occurring in reservoir sandstones of the Lower Permian Aldebaran Sandstone. Where the unit is no longer an ...
Authigenic Kaolinite and Dickite Associated with Metal Sulfides—Probable Indicators of a Regional Thermal Event
Dickite Kaolinite Metallic ores Morphology Regional thermal event
2012/1/9
Authigenic, well-crystallized kaolinite and dickite occur within sulfide mineral deposits (minesize to hand-specimen size occurrences) of the Mississippi Valley type in Arkansas, Kansas, Missouri, Iow...
An Occurrence of Authigenic Nacrite
Authigenesis Kaolin-group mineral Nacrite Pore solution Shale
2012/1/9
Euhedral, pseudohexagonal nacrite was discovered as a thin layer coating a carbonaceous shale in the Sherwood Tunnel in Durban, Republic of South Africa. The nacrite apparently formed authigenically w...
Authigenic Chrysotile Formation in the Matrix of Quaternary Debris Flows, Northern Southland, New Zealand
Authigenesis Chrysotile Debris flow Pseudoboehmite Serpentine
2011/11/25
Abstract: Quaternary debris flows derived from ophiolite melange in northern Southland, New Zealand, are locally cemented and veined by cross-fiber and fine-grained chrysotile. Chrysotile was identifi...
Cristobalite Authigenic Origin in Relation to Montmorillonite and Quartz Origin in Bentonites
Cristobalite Authigenic Origin Montmorillonite Quartz Origin
2012/2/20
Three kinds of opal-cristobalite, differentiated by the sharpness of the 4·1 Å XRD peak, were isolated from the Helms (Texas) bentonite by selective chemical dissolution followed by specific gra...
Authigenic Silicates Formed from Basaltic Glass by More Than 60 Million Years' Contact with Sea Water, Sylvania Guyot, Marshall Islands
Authigenic Silicates Basaltic Glass Sea Water Sylvania Guyot
2011/11/16
Dredge haul MP43A, from a depth of 6180–10,860 ft on Sylvania Guyot, the companion seamount to Bikini Island, yielded large blocks of yellow buff-colored rock consisting of clay, opal, phillipsite, an...