Инд. авторы:	Kruk N.N., Simanenko V.P., Gvozdev V.I., Golozubov V.V., Kovach V.P., Serov P.I., Kholodnov V.V., Moskalenko E.Y., Kuibida M.L.
Заглавие:	Early Cretaceous granitoids of the Samarka terrane (Sikhote-Alin'): geochemistry and sources of melts
Библ. ссылка:	Kruk N.N., Simanenko V.P., Gvozdev V.I., Golozubov V.V., Kovach V.P., Serov P.I., Kholodnov V.V., Moskalenko E.Y., Kuibida M.L. Early Cretaceous granitoids of the Samarka terrane (Sikhote-Alin'): geochemistry and sources of melts // Russian Geology and Geophysics. - 2014. - Vol.55. - Iss. 2. - P.216-236. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2014.01.007; РИНЦ: 21863582; SCOPUS: 2-s2.0-84893069454; WoS: 000330613000007;
Реферат:	eng: We present new data on the geologic position, composition, and isotope characteristics of the Early Cretaceous granitoids of the Samarka terrane, Sikhote-Alin', formed on a transform continental margin. Geological and geochronological data show that these granitoids were generated at two stages of magmatism: in the first half (Hauterivian-Barremian, 130-123 Ma) and second half (Albian-Cenomanian, 110-98 Ma) of the Early Cretaceous. Granitoids of the first stage form an autonomous (free of basic precursors) unimodal melanogranite-granite association and are characterized by normal alkalinity with domination of K over Na, low contents of Ca, and elevated contents of Al2O3. By composition, these are S-granites with a model Nd age of similar to 1.3 Ga. Granitoids of the second stage are of more diverse petrogeochemical types. They show wider variations in K/Na and A/CNK, are richer in Ca and, sometimes, Sr,and are poorer in P than the granitoids of the first stage. Their compositions form a continuous trend from S- to I-granites, and their model Nd age is <= 1.2 Ga. Comparison of the petrochemical, trace-element, and isotope characteristics of the Early Cretaceous granitoids and upper-crustal rocks (sandstones and siltstones of the turbidite matrix of a Jurassic accretionary prism and basalts from the inclusions in it) of the Samarka terrane and the coeval garrboids has shown that the potassic S- granitoids formed at the early (Hauterivian-Barremian) stage of magmatism as a result of the anatexis of upper-crustal sedimentary rocks. At the late (Albian-Early Cenomanian) stage, the intrusion of mantle magmas led to a temperature increase in the lower crust, which favored more active anatexis, involvement of high-melting substrates (oceanic basalts) in the granite formation, and interaction of mantle and crustal magmas. This resulted in a great diversity of granitoids (from S- to I-type). (C) 2014, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
Ключевые слова:	GEODYNAMICS; ND; LAKE ZONE; VOLCANIC-ROCKS; CONTINENTAL-CRUST; ISOTOPIC SYSTEMATICS; DISCRIMINATION; PLASMA-MASS SPECTROMETRY; Sikhote-Alin'; petrogenesis; isotope composition; geochemistry; Early Cretaceous granitoids; TRACE-ELEMENTS; EVOLUTION;
Издано:	2014
Физ. характеристика:	с.216-236