نتایج جستجو برای: banded gneiss
تعداد نتایج: 4403 فیلتر نتایج به سال:
The Bundelkhand-Aravalli craton is the most important lithotectonic unit in the central and western India where Paleoproterozoic Aravalli Supracrustal sequence has been deposited over an Archaean basement, the latter also known as the Banded Gneiss Complex (BGC). A NE-trending linear metasedimentary sequence, designated as the Jahazpur Belt occurs along the eastern fringe of the Aravalli Superg...
the bundelkhand-aravalli craton is the most important lithotectonic unit in the central and western india where paleoproterozoic aravalli supracrustal sequence has been deposited over an archaean basement, the latter also known as the banded gneiss complex (bgc). a ne-trending linear metasedimentary sequence, designated as the jahazpur belt occurs along the eastern fringe of the aravalli superg...
Landsat 8 OLI data, Aeromagnetic and Radial Vertical Electrical Sounding (RVES) survey data were integrated to map lithology, delineate structures their trends, possible mineralized zones in the area. yielded a color composite image, surface lineaments of The aeromagnetic maps utilized subsurface structures. A radial confirmed fractures derived from structural maps. Results classified area into...
This study aimed at the geological and geospatial mapping of flood vulnerable areas in Ganaja, Lokoja metropolis for proper mitigation. The area involved taking several traverses understudying different rock types area. Rocks identified are porphyritic granite, migmatite, augen gneiss, aplitic medium-grained pegmatitic intrusions quartzo-feldspathic veins, banded gneiss biotite gneiss. Fracture...
This study aims to account for the petrogenesis and mineralization of pegmatites around Wowyen area, northcentral basement complex,Nigeria. Field studies, petrography whole rock geochemistry (Major oxides were estimated by X-Ray Fluorescence while trace elements Inductively Coupled Plasma Mass Spectrometry) where methods adopted. The area are emplaced in remobilized belt Nigerian Basement compl...
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...
Fractured Gneiss aquifers present a challenge to hydrogeologists because of their geological complexity. Interpretation methods which can be applied to porous media cannot be applied to fractured Gneiss aquifers because flow and transport occur in fractures, joints, and conduits. In contrast, the rock matrix contribution to groundwater flow is not very important in Gneiss aquifers. Sodium chlor...
Geochemical signatures throughout the layered Earth require significant mass transfer through the lower crust, yet geological pathways are under-recognized. Elongate bodies of basic to ultrabasic rocks are ubiquitous in exposures of the lower crust. Ultrabasic hornblendite bodies hosted within granulite facies gabbroic gneiss of the Pembroke Valley, Fiordland, New Zealand, are typical occurrenc...
It is suggested that in a localized remnant of Kalahari sand at Dufuya, central Zimbabwe, groundwater flows in an integrated pattern inherited from the paleochannel network of the underlying gneiss. Contact springs occur at discrete localities along the Kalahari sand/gneiss boundary and are associated with spring sapping and land surface subsidence. Subsidence is presumed to be due to preferent...
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