Zircon U-Pb age,Hf isotopic composition and geochemical characteristics of the Yangtouya intrusion in Shanxi Province and their geological significances
In order to constrain petrogenesis and tectonic setting of the Yangtouya intrusion in the North China Craton,we have carriedout geochronological,Hf isotopic and geochemical study of fresh granite porphyry samples from the Yangtouya intrusion in Shanxi Province.The results show that the granite porphyry of the Yangtouya intrusion was formed in Early Cretaceous(131.7±0.5Ma).The granite porphyry which is enriched in Si belongs to the high-K calc-alkaline weak peraluminous granite.It is relatively enriched in LILEs(such as K,Pb and Rb)and LREE,but relatively depleted in HFSEs(such as Nb,Ce,Zr and Ti)and HREE.Its samples have negative Eu anomalies.Their zircons have negative εHf(t)values ranging from-28.6 to-19.7.The granite porphyry of the Yangtouya intrusion is generally I-type granite.It was mainly formed by the magma derived from partial melting of the Neoarchean-Paleoproterozoic crustal materials with minor mantle-derived inputs.It was formed in extensional tectonic setting under the subduction of the Paleo-Pacific plate toward the Eurasian plate in the Early Cretaceous,and is the product of the transition of the North China Craton tectonic system in the Mesozoic era.
granite porphyryEarly Cretaceousthe North China Cratontectonic settingthe Yangtouya intrusion
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