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- W2384394637 abstract "This paper presents petrological,geochronological and geochemical study on Late Paleozoic intermediate-felsic intrusions from the Ondor Sum-Tieshagai area in Inner Mongolia,which is tectonically located in the central-northern margin of the North China Craton.These intrusions comprise mainly biotite-hornblende quartz diorite and hornblende-biotite granodiorite with abundant mafic enclaves in field.U-Pb dating of zircons from three samples by LA-ICP-MS yield weighed mean206Pb /238U ages of 271.8 ± 2.4Ma,271.4 ± 1.3Ma and 268.7 ± 1.3Ma,respectively.These rocks have SiO 2 = 61.42% ~ 71.73%,K 2 O = 3.10% ~ 5.11%,K 2 O / Na 2 O = 0.93 ~ 1.96,Mg#= 42.54 ~ 49.93,A / CNK = 0.90 ~ 1.03,features of high-K calc-alkaline I-type granitoids.They also show strong enrichments in light rare earth(LREEs) and large ion lithophile elements(LILEs,e.g.,Cs,Rb,Ba,K,Th and U) and depletions in high field-strength elements(HFSEs,e.g.,Nb,Ta and Ti) and heavy rare earth(HREEs),with weakly negative Eu anomalies(δEu = 0.55 ~ 0.95).The primary magma for granitoids could be mainly derived from partial melting of the upper crust.The mafic microgranular enclaves(MMEs) are biotite diorites,characterized by low Si and K,enrichment in Fe,Mg,Ca,Ti,LILEs(Rb,Cs,Sr,U) and HFSEs(Nb,Ta,Zr,Hf) when compared with the host rocks,its primary magma could be mainly derived from partial melting of lithospheric mantle,implying an important role of magma mixing during the magmatic differentiation.The combined geochemical features of these intermediate-felsic intrusions and the MMEs likely indicate their formation in an active continental margin as a result of Middle Permian subduction of the Paleo-Asian Ocean beneath the northern margin of the North China Craton." @default.
- W2384394637 created "2016-06-24" @default.
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- W2384394637 date "2013-01-01" @default.
- W2384394637 modified "2023-09-27" @default.
- W2384394637 title "Early-Middle Permian tectonic evolution of the central-northern margin of the North China Craton:Constraints from zircon U-Pb ages and geochemistry of the granitoids" @default.
- W2384394637 hasPublicationYear "2013" @default.
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