منابع مشابه
Gneiss domes and gneiss dome systems
Various mechanisms have been proposed for the dynamic cause and kinematic development of gneiss domes. They include (1) diapiric fl ow induced by density inversion, (2) buckling under horizontal constriction (i.e., extension perpendicular to compression), (3) coeval orthogonal contraction or superposition of multiple phases of folding in different orientations, (4) instability induced by vertic...
متن کاملPrecambrian Quartzo - Feldspathic Gneiss from the Herman
Precambrian quartzo-feldspathic gneiss was encountered at an elevation of —3616 feet in the Herman 1A well drilled in southeastern Erie County, Ohio, by the Amerada Petroleum Corporation. The five samples of this gneiss that were studied exhibit varying degrees of gneissose foliation. In order of decreasing abundance, microcline, plagioclase, quartz, and biotite together account for an average ...
متن کاملHidden Inscriptions in the Laurentian Library
Following the discovery of a series of geometric designs on the floor of the Biblioteca Laurenziana in Florence we analyse the “Medici panel”, which consists of a circular rosette containing a set of inscribed elliptical disks, with a view to regenerating the pattern. The geometry is shown to be surprisingly complex. We were able to determine a numerical solution for synthesising the pattern. A...
متن کاملThe Potential of Blended Learning in Agricultural Education of Ireland
The management of agricultural education faces on-going challenges to deliver current and effective materials in an approach that takes advantage of developments in education technology. In this article the use of blended learning was compared with the traditional approach for the instruction of theoretical materials in agricultural education. This study used a pre-test, post-test experimental ...
متن کاملTungsten isotope composition of the Acasta Gneiss Complex
a School of Earth Sciences, Bristol Isotope Group, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol BS8 1RJ, United Kingdom b School of Earth, Atmospheric and Environmental Sciences, Isotope Geochemistry & Cosmochemistry Group, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom c Department of Geological Sciences, NASA Lunar Science Institute Center f...
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ژورنال
عنوان ژورنال: Nature
سال: 1881
ISSN: 0028-0836,1476-4687
DOI: 10.1038/024100a0