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Browsing by Author "Hames, Willis E."

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40Ar/39Ar age variations among cogenetic feldspars from the Benson Mines, New York 

Gunn, James N. (2016-08-05)
The alkali feldspar group constitutes one the most common mineral groups of Earth’s crust. The 40Ar/39Ar method for dating potassium feldspars has proven to be a powerful analytical tool for evaluating low-temperature ...

Geology of the Wadley South Quadrangle and geochronology of the Dadeville Complex, southernmost Appalachians of east Alabama 

VanDervoort, Dane S. (2016-08-01)
Geologic mapping results from rocks in the area of the Wadley South Quadrangle are reported to address basic research questions concerning the Paleozoic tectonometamorphic evolution of the southernmost Appalachians. Key ...

Geology, Petrology, and Geochronology of Rocks in the Our Town, Alabama Quadrangle 

Hawkins, John (2013-11-06)
The area of the 1:24,000 Our Town Quadrangle of east central Alabama is underlain principally by generally undifferentiated metasedimentary units, the Emuckfaw and Wedowee Groups, which have been intruded by major southern ...

Glauconite as an Indicator of Sequence Stratigraphic Packages in a Lower Paleocene Passive-Margin Shelf Succession, Central Alabama 

Udgata, Devi (2007-12-15)
The Lower Paleocene Clayton Formation in central Alabama comprises a complete third-order depositional sequence that accumulated mainly on a passive-margin marine shelf. Glauconite occurs throughout the sequence, providing ...

Inverse source problem and inverse diffusion coefficient problem for parabolic equations with applications in geology 

Ngoma, Sedar (2017-07-26)
This dissertation deals with inverse problems for parabolic partial differential equations with an integral constraint and their applications in geology. We employ analytical and numerical methods to analyze and approximate ...

Paleogeographic Reconstruction of Part of Eastern Gondwanaland:Petrofacies and Detrital Geochronologic Study of Permo-Carboniferousgondwanan Sequences of India and Bangladesh 

Chowdhury, Nur Uddin Md. Khaled (2014-08-19)
This study has been carried out focusing on petrofacies and geochronology of Permo-Carboniferous Gondwanan sequences of Barapukuria, Dighipara, and Khalaspir coal basins in the Bengal Basin and Jharia Basin in the Eastern ...

Trace Element and Hf-Nd Isotope Constraints on the Origin of Young Tengchong Volcanic Rocks, SE Tibetan Plateau 

Ma, Mingjia (2014-05-14)
Hafnium and neodymium isotope systematics in mafic volcanic rocks provide useful information about mantle source characteristics and processes. Hf and Nd isotope arrays are useful for identifying the types of subducted ...