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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...
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...
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. % ...
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...
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...
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...
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...
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...
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, 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...
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...
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...
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...
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...

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