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Revisiting silicate authigenesis in the Pliocene–Pleistocene Lake Tecopa beds, southeastern California: Depositional and hydrological controls
saline, alkaline lake, Pliocene–Pleistocene, zeolite, depositional facies, authigenic minerals
2011/11/14
The Pliocene–Pleistocene Lake Tecopa beds present a well-documented example of authigenic silicate diagenesis in an ancient saline, alkaline lake environment. Controls on authigenic mineral formation ...
Stable Isotope Evolution of Volcanic Ash Layers during Diagenesis of the Miocene Monterey Formation, California
Bentonite Diagenesis Monterey Formation Stable Isotopes Volcanic Ash
2011/12/2
Abstract: The oxygen and hydrogen isotope compositions of volcanic ash layers from coastal outcrops of the Miocene Monterey Formation elucidate the progressive burial diagenesis of glass to bentonite ...
Eocene and Oligocene Otay-Type Waxy Bentonites of San Diego County and Baja California: Chemistry, Mineralogy, Petrology and Plate Tectonic Implications
Chemistry Mineralogy Otay Bentonite Plate Tectonics Volcanism Waxy Bentonite
2011/12/2
Abstract: Otay-type waxy bentonites of San Diego County are illite-smectite (I-S) with 85% dioctahedral smectite mixed with dioctahedral illite showing a Reichweite of 0. Primary or secondary waxy ben...
Mg-Smectite Authigenesis in a Marine Evaporative Environment, Salina Ometepec, Baja California
Baja California Early Diagenesis Hypersaline Brines K-smectite Mg-smectite Salina Ometepec Saponite Trioctahedral Smectite
2011/12/7
Abstract: Formation of authigenic trioctahedral Mg-rich smectite is common in evaporative lake sediments, but was not described previously in modern marine evaporative environments. This study documen...
Chemical microstructure of Franciscan jadeite from Pacheco Pass, California
Chemical microstructure Franciscan jadeite
2012/3/31
The chemical microstructure of five jadeitic pyroxenes from three Franciscan quartzose metagraywacke samples was investigated by backscattered electron imagery, element map-ping, and electron micropro...
HRTEM of microcrystalline opal in chert and porcelanite from the Monterey Formation, California
HRTEM microcrystalline opal chert porcelanite Monterey Formation California
2012/4/9
Microcrystalline opal wasinvestigated using low-dose transmission electron microscopy (TEM) methods to identify microstructural characteristics and possible phase-transforma-tion mechanisms that accom...
Clay Minerals in the MacAdams Sandstone, California: Implications for Substitution of H3O+ and H2O and Metastability of Illite
Electron microscopy Hydronium Illite Kaolinite Muscovite Rectorite
2011/12/1
Abstract: Clay minerals from the MacAdams Sandstone, Kettleman North Dome, California, have been studied by electron microscopy. The clay minerals fill pore space associated with fractured and breccia...
Clay Mineral Diagenesis in Core KM-3 of Searles Lake, California
Analcime Diagenesis Fe-illite K-feldspar Mg-smectite Montmorillonite Oxygen isotopes Phillipsite Searles Lake
2011/11/30
Abstract: Core KM-3 at Searles Lake, California, comprises 693.4 m of lacustrine sediments deposited over the past 3.2 m.y. The lake water evolved from moderately saline, slightly alkaline, and domina...
Origin and Diagenesis of Clay Minerals in the Monterey Formation, Santa Maria Basin Area, California
Bentonite Diagenesis Illite/Smectite Illitization Kaolinite Zeolite
2012/1/4
The clay mineralogy of the Miocene Monterey Formation was determined for onshore and offshore sequences in the Santa Maria basin area, California. The <0.1-祄 fraction of clayey, opal-CT porcelanites, ...
Structural Variations in Chlorite and Illite in a Diagenetic Sequence from the Imperial Valley, California
Chlorite Diagenesis High-gradient magnetic separation Illite Interstratification Polytype X-ray powder diffraction
2012/1/4
Samples of cuttings from the Borchard A-2 well, Imperial Valley, California, were collected over a measured borehole temperature interval 135° to 275°C. The <0.5-µm (e.s.d.) fraction was separat...
Microstructures, Formation Mechanisms, and Depth-Zoning of Phyllosilicates in Geothermally Altered Shales, Salton Sea, California
Chlorite Electron microscopy Fluid-mineral equilibria Geothermal field Illite Salton Sea Smectite Texture
2011/11/28
Abstract: Scanning, transmission, and analytical electron microscopy studies of shales from the Salton Sea geothermal field revealed that phyllosilicates progress through zones of illite-muscovite (11...
Celadonite and its Transformation to Smectite in an Entisol at Red Rock Canyon, Kern County, California
Celadonite Entisol Mica Mossbauer spectroscopy Smectite Soil Weathering X-ray powder diffraction
2012/1/10
A green, Lithic Torriorthent soil derived from a celadonite-rich, hydrothermally altered basalt immediately north of the Mojave Desert region in southern California was studied to investigate the fate...
Sodic Clay-Zeolite Assemblage in Basalt at Boron, California
Analcime Boron Cation exchange Clinoptilolite Gmelinite Heulandite Phillipsite Saponite Sodium Zeolite
2012/1/9
An assemblage of clay minerals, Na-zeolites, Fe- and Sb-sulfides, and borates occurs in cavities in the basalt flow that underlies the main borax ore body exposed by the U.S. Borax open pit at Boron, ...
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...
Mixed-Layer Illite/Smectite Minerals in Tertiary Sandstones and Shales, San Joaquin Basin, California
Carbonate cementation Illite/smectite Microprobe analysis Mixed layer Smectite Time-temperature index
2012/1/11
The southern San Joaquin Valley contains more than 7 km of sedimentary fill, largely Miocene and younger in age. Ancient depositional environments ranged from alluvial fans at the basin margins to tur...