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Articles 301 - 315 of 315
Full-Text Articles in Earth Sciences
Tunnel Geology As Seen By Geologists: Manhattan, New York City, Nazrul I. Khandaker, Stanley Schleifer, Masud Ahmed, Alan R. Slaughter, Belal A. Sayeed, Dorean J. Flores, Mario Jo-Ramirez
Tunnel Geology As Seen By Geologists: Manhattan, New York City, Nazrul I. Khandaker, Stanley Schleifer, Masud Ahmed, Alan R. Slaughter, Belal A. Sayeed, Dorean J. Flores, Mario Jo-Ramirez
Publications and Research
Current exploratory boring operations in and around Manhattan, New York City are providing geologists and geotechnical engineers with a plethora of new and interesting geological information, which has not been previously reported. The rocks encountered, mostly medium to high-grade metamorphic rocks, with both mafic and felsic intrusives, are highly variable in competency and mechanical durability. One of the most frequently encountered rock types is a garnetiferous-muscovite-biotite schist which grades into schistose gneiss and displays a wide variety of structural, compositional, and textural attributes. Metamorphic minerals showing the variable degree of metamorphism include graphite, talc, garnet, kyanite, tourmaline, emory, and occasionally …
A Handheld Polarimeter For Aerosol Remote Sensing, James W. Frost, Fouad Nasraddine, J. Rodriguez, I. Andino, Brian Cairns
A Handheld Polarimeter For Aerosol Remote Sensing, James W. Frost, Fouad Nasraddine, J. Rodriguez, I. Andino, Brian Cairns
Publications and Research
In this paper we show how measurements made by a simple handheld polarimeter in conjunction with automated sunsky radiometers can be used to effectively constrain the real part of the complex refractive index of aerosols. We find that even measurements over a limited angular range near 90° scattering angle are sufficient for this purpose. We also note that because of the effect of surface reflectance on the observed degree of linear polarization (DOLP) it is sensible to select spectral bands for these measurements for which the surface is relatively dark and homogeneous (i.e. wavelengths shorter than 700 nm are to …
Biospeleologists, Aldemaro Romero Jr.
The Unsung Heroes Of Speleology, Aldemaro Romero Jr., Kathryn Benz
The Unsung Heroes Of Speleology, Aldemaro Romero Jr., Kathryn Benz
Publications and Research
No abstract provided.
Hydrothermal Sediments Associated With A Relict Back-Arc Spreading Center In The Shikoku Basin, Recovered From The Nankai Accretionary Prism, Japan, Jane L. Alexander, Kevin T. Pickering, Elizabeth H. Bailey
Hydrothermal Sediments Associated With A Relict Back-Arc Spreading Center In The Shikoku Basin, Recovered From The Nankai Accretionary Prism, Japan, Jane L. Alexander, Kevin T. Pickering, Elizabeth H. Bailey
Publications and Research
The hemipelagic mudrocks of the Nankai accretionary prism, Japan, contain hydrothermal deposits associated with a relict spreading center in the Shikoku Basin. Initial work on core samples from Ocean Drilling Program Site 808 found several samples with elevated concentrations of calcium, magnesium, iron and manganese, at depths of between 1060 and 1111 m below sea floor. However, the origin of these sediments was uncertain, due to a lack of data. There was no recorded evidence of whether these elevated concentrations were present throughout this interval of core, or if they were present as discrete layers with the background hemipelagic mudrocks …
Microanalytical Investigations Of Gold-Bearing Rocks From The An Najadi Region In Saudi Arabia, Nazrul I. Khandaker, M. Ahmed, M. M. Hariri, M. A. Garwan, K. R. Khan, M. M. Al-Ohali
Microanalytical Investigations Of Gold-Bearing Rocks From The An Najadi Region In Saudi Arabia, Nazrul I. Khandaker, M. Ahmed, M. M. Hariri, M. A. Garwan, K. R. Khan, M. M. Al-Ohali
Publications and Research
The Proton Induced X-ray Emission technique with a scanning microbeam (micro-PIXE) and Scanning Electron Microscopy (SEM) were employed to study gold-bearing rocks from the An Najadi and adjacent regions situated within the exposed northeastern part of the Arabian Shield. These microanalytical investigations, together with routine petrological and ore microscopic studies, demonstrated the presence of important partitioning of major minerals and trace elements in several samples. These measurements also revealed microstructural features including brecciation within quartz grains and metal concentrations within these fracture-controlled micro-conduits. Results showed promise in terms of using distinctive geochemical signatures for ore body recognition. Of particular interest …
Study Of Volcanic Sediments By Microbeam-Pixe Technique, Nazrul I. Khandaker, M. Ahmed, M. A. Garwan
Study Of Volcanic Sediments By Microbeam-Pixe Technique, Nazrul I. Khandaker, M. Ahmed, M. A. Garwan
Publications and Research
Single mineral grains in a suite of Cretaceous (85–90 Ma) volcanic sedimentary rocks were analyzed using the microbeam-PIXE technique to understand fundamental geological processes responsible for micro-scale variation in elemental composition across mineral zones, twinning, cleavage planes, fractures and grain boundaries. Distributions of major and trace elements show distinct geochemical features indicative of a specific geological setting and a subsequent diagenetic process in these volcanic sediments. Examples of mineral zoning, microstructures of variable chemistry and post-depositional fluid flow are discussed using the data on feldspar group of minerals.
Natural And Technological Disasters: Causes, Effects And Preventive Measures, Nazrul I. Khandaker
Natural And Technological Disasters: Causes, Effects And Preventive Measures, Nazrul I. Khandaker
Publications and Research
No abstract provided.
El Hombre Comenzó A Extinguir Especies Hace 11.000 Años, Aldemaro Romero Jr.
El Hombre Comenzó A Extinguir Especies Hace 11.000 Años, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Que La Luz De La Sabiduría Ilumine Nuestras Cuevas, Aldemaro Romero Jr.
Que La Luz De La Sabiduría Ilumine Nuestras Cuevas, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Tarracolimulus Rieki, Nov. Gen., Nov. Sp., Nuevo Limúlido Del Triásico De Montreal – Alcover (Tarragona), Aldemaro Romero Jr., L. Vía Boada
Tarracolimulus Rieki, Nov. Gen., Nov. Sp., Nuevo Limúlido Del Triásico De Montreal – Alcover (Tarragona), Aldemaro Romero Jr., L. Vía Boada
Publications and Research
No abstract provided.
Predicción De Terremotos: ¿Cuándo?, Aldemaro Romero Jr.
Predicción De Terremotos: ¿Cuándo?, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Descubiertos Restos Recientes De Un Megaterio, Aldemaro Romero Jr.
Descubiertos Restos Recientes De Un Megaterio, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
La Deriva De Los Continentes, Aldemaro Romero Jr.
La Deriva De Los Continentes, Aldemaro Romero Jr.
Publications and Research
No abstract provided.
Los Cañones Submarinos, Aldemaro Romero Jr.
Los Cañones Submarinos, Aldemaro Romero Jr.
Publications and Research
No abstract provided.