Influence of precambrian basement on the chemical composition of Mesozoic granitoid rocks in northeastern Asia |
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Authors: | M A Romanova |
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Institution: | (1) Laboratory of Mathematical Geology of the Institute of Geology and Geochronology of the Precambrian, Academy of Science of the USSR, 12 Voinov St., 191197 Leningrad, USSR |
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Abstract: | A hypothesis for effects of stable tectonic elements on chemical composition of Mesozoic granitoids in northeastern Asia is tested. Chemical compositional change of granitoid rocks is examined in nine-dimensional space of rock-forming oxides. Stable geologic structures of the region are outlined by trends of Euclidean distances between rock recognized as a standard in a space of major rock-forming oxides and composition of individual samples. A data-smoothing polynomial of the fourth order corresponds closely to the geology of the region. Chemically stable masses of quartz diorite are thought to be delivered directly from magmatic sources along deep faults. A great variety of acidic granites, which occupy for each analysis separate cells in the nine-dimensional classification, are presumed to be palingenetic in origin. |
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Keywords: | vector of chemical composition of a rock quantile simplex Euclidean distance comparative trend surface analysis stable element mobile zones |
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