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• W2078011306 endingPage "182" @default.
• W2078011306 startingPage "157" @default.
• W2078011306 abstract "The Solonker zone, extending from Solonker to Sonidzuoqi and Xilinhot in northern Inner Mongolia, China, has been considered as the suture between the Manchurides and Altaids. Two magmatic belts have been recognized along the suture zone: an older, variably deformed arc-related magmatic belt represented by the Baolidao magma suite, and a younger, collisional granite belt, represented by the Halatu plutons. The Baolidao suite is composed of gabbroic diorite, quartz diorite, tonalite and granodiorite. Hornblende is present in all rock types. The Halatu plutons consist mainly of two-mica adamellite and subordinate granodiorite and leucogranite. Hornblende is absent in all rock types. The bulk of Baolidao rocks were emplaced at ca. 310 Ma (zircon 206Pb/238U age). They are metaluminous to weakly peraluminous and possess high Na2O/K2O ratios from 2 to 10. They have no Eu anomalies in the REE patterns but show strong positive Sr anomalies in the primitive-mantle-normalized spidergrams. In contrast, the Halatu granites were formed at ≈230 Ma based on a whole-rock Rb–Sr isochron. They are weakly metaluminous to peraluminous and have rather uniform chemical compositions. In comparison with the Baolidao magma suite, they have much lower contents of FeO, MgO, CaO, TiO2, Cr, V and Sr, but are richer in SiO2, K2O and Rb. They also exhibit distinct negative Sr, P, Ti and Nb anomalies in the spidergrams and significant negative Eu anomalies in the REE patterns, a feature typical of crustal melts. The most primitive rock type of the Baolidao suite (gabbroic diorite) has ISr=0.7052 and ϵNd(T)=+2.4, whereas the other rock types show small variations in both ISr (0.7056–0.7059) and ϵNd(T) (+0.7 to −0.1). Geochemical modelling suggests that the gabbroic diorite was derived from a metasomatized upper mantle and the other rock types were generated from the gabbroic diorite magma by fractional crystallization coupled with assimilation of older crustal material (AFC), and followed by hornblende-dominated fractionation in a closed system. The Halatu granites exhibit a range of ISr (0.7048–0.7063) and ϵNd(T) (+1.0 to −2.2). They were derived from sources dominated by young mantle-derived rocks with variable amounts of ancient continental crust. The largely juvenile isotopic signature for both the Baolidao suite and Halatu granites indicates a significant addition of new continental crust in northern Inner Mongolia." @default.
• W2078011306 created "2016-06-24" @default.
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• W2078011306 date "2000-12-01" @default.
• W2078011306 modified "2023-10-18" @default.
• W2078011306 title "Two contrasting paleozoic magmatic belts in northern Inner Mongolia, China: petrogenesis and tectonic implications" @default.
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• W2078011306 doi "https://doi.org/10.1016/s0040-1951(00)00182-7" @default.
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