首页|The discovery of Late Triassic hypabyssal mafic dykes in the Huozhou complex and their geological significance:Evidence from petrology,geochemistry,and geochronology
The discovery of Late Triassic hypabyssal mafic dykes in the Huozhou complex and their geological significance:Evidence from petrology,geochemistry,and geochronology
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The discovery of Late Triassic hypabyssal mafic dykes in the Huozhou complex and their geological significance:Evidence from petrology,geochemistry,and geochronology
The Huozhou complex in the Trans-North China Orogen exhibits two events of mafic magmatism(separated by ca.700 Ma):Neoproterozoic(920±15 Ma)Shimenyu diabase and Late Triassic(217±2.5 Ma)Xingtangsi dia-base.Investigations have focused on systematic petrology,zircon U-Pb dating,Lu-Hf isotopes,and lithogeochemistry.The research findings indicate that the Late Triassic Xing-tangsi diabase of the Huozhou complex can be classified as a transitional type between intermediate and mafic rocks based on their SiO2 content.This classification is supported by an average SiO2 content of 53.94％,ranging from 53.33％to 54.28％.In the Zr/TiO2 vs.Ce diagram,all samples lie within the range of basalt.The zircons from the Late Trias-sic Xingtangsi diabase have low eHf(t)values ranging from-12.7 to-8.7,with an average of-11.1.Additionally,the single-stage model age TDM1 is estimated to be between 1207 and 1701 Ma.These findings suggest that the magma responsible for the dyke originated from either partial melt-ing or an enriched mantle source inside the Meso-Protero-zoic lithospheric mantle.The elevated concentrations of Th(thorium)and LREEs(light rare earth elements),as well as the Th/Yb and Th/Nb ratios,suggest the potential incor-poration of subducted sediments within the magma source region.The rock displays negative Nb,Ta,Zr,Hf,and Ti anomalies.These geochemical attributes align with the dis-tinctive traits observed in volcanic rocks found within island arcs.The formation of the Late Triassic Xingtangsi diabase is likely associated with the geological context of an arc setting,which arises from the collision between the Yangtze plate and the North China Craton.
Trans-North China OrogenHuozhou complexGeochemistryHf isotopeNorth China Craton
Haiyan Liu、Chong Peng
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College of Geographical Sciences,Shanxi Normal University,Taiyuan 030031,China
Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China
School of GeoSciences,University of Edinburgh,Edinburgh EH9 3JW,UK
Trans-North China Orogen Huozhou complex Geochemistry Hf isotope North China Craton
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