| 1 | Extensional tectonics and North China Craton destruction:Insights from the magnetic susceptibility anisotropy(AMS)of granite and metamorphic core complex显示文摘The craton is a long-lived stable geologic unit on the Earth’s surface.However,since the Mesozoic,the North China Craton(NCC)experienced large-scale lithospheric removal,the fundamental change of physical and chemical characteristics of the lithospheric mantle,widely distributed crustal deformation,and extensive magmatism.This complex evolution contrary to other cratons is called the NCC destruction.Widespread magmatism in the eastern NCC is an important response to the lithospheric removal at depth and crustal deformation on the surface.The plutons emplace under a tectonic context and therefore record the information of the tectonics;especially,the anisotropy magnetic susceptibility(AMS)pattern of the pluton was acquired with the influence of regional stress.In the past fifteen years,about 22 plutons intruding during the different periods from the Late Triassic to the late stage of the Early Cretaceous have been studied with AMS.The emplacement mechanisms of plutons and the contemporary tectonic setting were discussed to constrain their relationship with the NCC destruction in different stages of magmatism.As a result,the Late Triassic,Early Jurassic,and Late Jurassic plutons exhibit consistent N(E)-S(W)trending magnetic lineations.The early stage of Early Cretaceous plutons display NW-SE trending magnetic lineations,while the late stage of Early Cretaceous plutons show magnetic lineations with various orientations.Combined with previous studies,it is concluded that the emplacements of the plutons intruding in these three stages were controlled by weak N(E)-S(W)trending extension,regional NW-SE trending extension,and weak extension in the shallow crustal level,respectively.The transformation of regional extension from the N(E)-S(W)to the NW-SE direction was accompanied by a strain-increasing tendency.The extensional tectonics in the eastern NCC was interpreted to represent the interaction between Mongol-Okhotsk belt,PaleoPacific plate,and eastern Eurasian continent. | Wei LIN Jipei ZENG Lingtong MENG Huabiao QIU Wei WEI Zhiheng REN Yang CHU Shuangjian LI Chao SONG Qincheng WANG | 2021 | Science China Earth Sciences2021，64，9： | 1 |
| 2 | Water-soluble ions in hailstones in northern and southwestern China显示文摘Natural hailstones were collected and analyzed in the laboratory not only for their physical properties (e.g., structure, density,shape, and air bubbles), but also for their chemical properties(e.g., organic particles, biological particles, and water-soluble ions),which can help a clear understanding on microphysics and development of hailstorms [1–4]. Aerosol particles were carried up from the atmospheric boundary layer to the free atmosphere into | Xiaofei Li Qinghong Zhang Tong Zhu Zejun Li Jipei Lin Tian Zou | 2018 | Science Bulletin2018，63，18： | 1 |
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