Mathematics – Logic
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.t23b0577s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #T23B-0577
Mathematics
Logic
3672 Planetary Mineralogy And Petrology (5410)
Scientific paper
Recent advances in geology and sciences dealing with planets resulted in ever-growing information on the internal structure and composition of upper and lower mantle and its role in the development of mineral deposits. Thus, the analysis of geologic-geophysical velocity sections on DSS-MOVZ profiles, that cross Central Kyzylkum, has revealed a number of features, which are characteristic of the upper mantle rocks, related to morphology of bodies, their physical properties, consisting mainly in their contrasting values for contiquous blocks, and general increased velocity and density of the rocks they contain. Petrologic-geophysical analysis of the same profiles proved the previous conclusions, and besides it allowed us to create the geodinamical model of development of a complicated continental lithosphere within Central Kyzylkum Ore Magmatic Concenter (CKOMC). CKOMC is a part of Western Uzbekistan's territory, that has maximum concentration of gold ore deposits of different scale, including the gigantic one- Muruntau. There are two main factors, that condition the area of the concenter: 1.Obduction of crust of the ocean to continental one during the Upper Paleozoic collision of Kyrgiz-Kazakh and Karakum-Tadjik microcontinents; 2.Geochemical gold specialization of Turkestan paleo-ocean's lithosphere. As a result of obduction of doubled, and sometimes even trebled crust of the ocean to continental, the front of rock granitization shifted to the sphere of ocean sediments development, and granite-gneiss layer of the continental crust went down to granulite zone. The latter factor provoked mass penetration of fluids from the former granite-gneiss and sedimentary-metamorphic layers, which due to their uprush to the surface, formed fluid-hydrothermal system , enriched with gold, in the new upper crust. This, in its turn, conditioned the formation of numerous gold ore deposits of different facies and formations observed in Central Kyzylkums. Abrupt increase in the crust's thickness has broken the balance of the crust and mantle, melts of which also rushed upwards along the rift zones and faults, replacing the ancient and the newly formed granite-gneiss layer. Such a mechanism of the continental lithosphere formation explains the formation of blocks of crust, conditioned by the abrupt change of rocks having different density (1), and the presence single parts «waveguides» in lower parts of the upper crust, which are considered to be relics of the primary granite-gneiss layer enriched with fluids. Only the wedge of crust of the ocean thrusted over the continental crust could cause formation of rock blocks of unusual shape and content, but of the same metallogenic gold ore trend. The studied profiles allowed us to determine one more magmatogene structure of mantle formation. It has funnel shape, with its basement directed to the surface. Complex ring plutons and tectonic ring-shaped disturbances these can be seen during the analysis of space images. The narrowed part of the structure goes down to the lower mantle, and can form a shape of «sand-glass», the surface of which served as a «conductor» of mantle plumes to the upper crust. Evidence of this are bodies of alkaline mafites and ultramafites in the upper crust of Central Kyzylkums, and presence of non-coherent elements containing gold (such as platinum and rare earth elements) at gold ore deposits.
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