| Инд. авторы: | Likhanov I.I., Reverdatto V.V. |
| Заглавие: | Lower proterozoic metapelites in the northern Yenisei Range: Nature and age of the protolith and the behavior of material during collisional metamorphism |
| Библ. ссылка: | Likhanov I.I., Reverdatto V.V. Lower proterozoic metapelites in the northern Yenisei Range: Nature and age of the protolith and the behavior of material during collisional metamorphism // Geochemistry International. - 2011. - Vol.49. - Iss. 3. - P.224-252. - ISSN 0016-7029. - EISSN 1531-8397. |
| Внешние системы: | DOI: 10.1134/S0016702911030062; SCOPUS: 2-s2.0-79953006199; |
| Реферат: | eng: The variable P-T metamorphic conditions studied in the Fe-Al metapelites of the Karpinskii Range Formation are regarded as typical of collision-related metamorphism in the trans-Angara part of the Yenisei Range. Recently obtained geochronologic (SHRIMP-II U-Pb zircon dating) and geochemical data on the distribution of major and trace elements are used to reproduce the composition of the protolith, the facies conditions under which it was formed, the tectonic setting, and the age of the eroded rocks. The metapelites are determined to be redeposited and metamorphosed material of Precambrian kaolinite-type weathering crusts of predominantly kaolinite-illite-montmorillonite-quartz composition. The protolith of the rocks was formed via the erosion of Lower Proterozoic granite-gneiss complexes of the Siberian craton (dated mainly within the range of 1962-2043 Ma) and the subsequent accumulation of this material in a continent-marginal shallow-water basin in a humid climate and tectonically calm environment. These results are consistent with data of lithologic-facies analysis and geodynamic reconstructions of the Precambrian evolution of geological complexes in the Yenisei Range. Mass-transfer analysis with the use of the evaluated rock compositions and calculated chemical reactions indicates that the differences in the REE patterns of metapelites from distinct zones can be explained mostly by the chemical heterogeneity of the protolithic material and, to a lesser extent, by metamorphic reactions at a pressure increase. © 2011 Pleiades Publishing, Ltd.
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| Ключевые слова: | metamorphism of metapelites; Precambrian weathering crust REE; protolith; U-Pb dating; Yenisei Range; collisional metamorphism; Metapelites; Precambrian; Protoliths; U-Pb dating; Yenisei Range; Analytical geochemistry; Geochronology; Geodynamics; Kaolin; Kaolinite; Metamorphic rocks; Quartz; Silicate minerals; Soil mechanics; Trace elements; Weathering; chemical composition; chemical reaction; chemical weathering; erosion; geochemistry; geochronology; geodynamics; gneiss; granite; lithology; mass transfer; metamorphism; metapelite; P-T conditions; Precambrian; Proterozoic; protolith; rare earth element; tectonic setting; uranium-lead dating; Decapoda (Crustacea); Yenisei Ridge; Russian Federation; Krasnoyarsk [Russian Federation]; collisional metamorphism; trace element; |
| Издано: | 2011 |
| Физ. характеристика: | с.224-252 |