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Evaluating the character and preservation of DNA within allophane clusters (microaggregates) in buried soils on Holocene tephras, northern New Zealand
Evaluating character preservation DNA allophane clusters (microaggregates) buried soils Holocene tephras
2012/3/30
Clay minerals possess sorptive capacities for organic and inorganic matter, including DNA (Lorenz and Wackernagel, 1994), and hence reduce the utilization and degradation of organic matter or DNA by m...
Genesis of Dioctahedral Phyllosilicates During Hydrothermal Alteration of Volcanic Rocks: II. The Broadlands-Ohaaki Hydrothermal System, New Zealand
Crystallization Dioctahedral Phyllosilicates Hydrothermal System Illite-Smectite (I-S) Polytypism Transmission Electron Microscopy
2011/12/2
Abstract: The clay mineral textures, assemblages, formation mechanisms, and controlling geological parameters relating to alteration of silicic volcanic rocks by hydrothermal solutions, in core sample...
Genesis of Dioctahedral Phyllosilicates During Hydrothermal Alteration of Volcanic Rocks: I. The Golden Cross Epithermal Ore Deposit, New Zealand
1M polytype Dioctahedral Clay Minerals Epithermal Hydrothermal Alteration Illite-Smectite (I-S) Neoformation Smectite Transmission Electron Microscopy (TEM)
2011/12/2
Abstract: To characterize the evolution of dioctahedral interstratified clay minerals in the Golden Cross epithermal deposit, New Zealand, hydrothermally altered volcanic rocks containing the sequence...
Transformation of Smectite to Illite in Bentonite and Associated Sediments from Kaka Point, New Zealand: Contrast in Rate and Mechanism
Analcimized Tuff Bentonite Berthierine Illite Kaka Point Mixed-layer I/S New Zealand Siltstone Smectite Zeolite Facies
2011/12/1
Abstract: Smectite and mixed-layer illite/smectite (I/S) in Triassic heulandite-rich bentonite from Kaka Point, New Zealand, have been investigated by scanning electron microscopy (SEM), transmission ...
Mixed-Layer Clay Geothermometry in the Wairakei Geothermal Field, New Zealand
Geothermal system Hydrothermal alteration Mixed-layer clays Reservoir permeability
2012/1/4
Mixed-layer clays of variable composition and structure occur in core samples from two drillholes (WK207 and WK210) drilled into the Te Mihi sector of the Wairakei geothermal field. These were identif...
Oxygen Isotope Measurements of Albite-Quartz-Zeolite Mineral Assemblages, Hokonui Hills, Southland, New Zealand
Albite Diagenesis Formation temperature Heulandite Laumontite Oxygen isotopes Quartz Stilbite Zeolites
2012/1/6
The oxygen isotopes of albite, quartz, and zeolites from the Hokonui Hills, New Zealand, constrain crystallization temperatures and the type of pore fluids present during diagenesis. A section of alte...
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...
Morphology and Structure of Halloysite in New Zealand Tephras
Crystal dislocations Electron microscopy Growth mechanisms Halloysite Morphology
2011/11/22
Abstract: As shown by scanning and transmission electron microscopy, halloysite in three rhyolitic tephras occurs as squat and elongate ellipsoids. Both morphologies are presumed to result from a simi...
Laminar Opaline Silica from Some Volcanic Ash Soils in New Zealand
Andosols Opaline silica Volcanic ash soils Weathering
2011/11/22
Laminar Opaline Silica from Some Volcanic Ash Soils in New Zealand.
Structure of Some Allophanes from New Zealand
Allophane Crystal structure Imogolite Infrared spectroscopy Phosphate adsorption Volcanic ash
2012/2/9
Allophane samples from soils, pumice, and stream beds have been studied by electron optical, infrared absorption, X-ray fluorescence, gas chromatography, and phosphate adsorption methods. The allophan...
Mineralogy and Geology of the Maungaparerua Halloysite Deposit in New Zealand
Mineralogy Geology Maungaparerua Halloysite Deposit New Zealand
2011/11/18
Abstract: The Maungaparerua halloysite deposit is located on the North Island of New Zealand some 210 km north of Auckland. The halloysite deposit was formed by hydrothermal alteration of rhyolite flo...
Clay Minerals in Hydrothermally Altered Rocks at Wairakei, New Zealand
Clay Minerals Hydrothermally Rocks Wairakei
2012/2/21
Geothermal fluid discharged by steam wells, which have been core drilled to depths as much as 4500 ft at Wairakei, New Zealand, has altered Pliocene to Pleistocene, silicic, mainly glassy volcanics an...