Constraints on crustal compositional architecture across the North China–Altaids transition and implications for craton margin reworking  

作　　者：Zhuo Ye Xiaomiao Tan Rui Gao Qiusheng Li Hongshuang Zhang Xiaoyang Wu Wenhui Li Yingkang Li 

机构地区：[1]SinoProbe Center,Chinese Academy of Geological Sciences,Beijing 100037,China [2]Key Laboratory of Deep-Earth Dynamics,Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China [3]School of Earth Sciences and Engineering,Sun Yat-sen University,Guangzhou 510275,China [4]Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [5]China Geological Sample Information Center,China Geological Survey,Langfang 065201,China

出　　处：《National Science Review》2024年第5期114-126,共13页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(42074106 and 91962110);the National Key R&D Plan of China(2023YFF0803302).

摘　　要：The phase of secular evolution of continents is manifested as the degree of compositional differentiation,modification and maturation of continental crusts,which is vital in understanding the mechanism of continental evolution but is difficult to quantify.Here we use integrated passive-and active-source seismic profiling to conduct joint analysis and inversion and derive Vs and Vp/Vs section models across the North China Craton(NCC)to southeastern Altaids boundary zone that bears a tectonic transition from a reworked ancient craton margin to a Phanerozoic accretionary orogen.We systematically exploited the imaged multiple physical properties as precise and delicate proxies to constrain the compositional architecture in the crust across this important tectonic transition subject to various crustal evolutional phases.Our Vs and Vp/Vs imaging,together with the existing isotopic data,characterizes the Yin Shan–Yan Shan belt as the northern NCC margin with layered homogeneous compositions that point to an evolved crust.However,the lower-crustal low-Vs/high-Vp/Vs signature that overlaps the shallowly dipping to horizontal reflective fabrics suggests that the crust of the northern NCCmargin has undergone considerable reworking through lower-crustal-stretching-assisted melt migration and mixing since the late Paleozoic to Mesozoic eras.The process probably involved crust–mantle interaction and thus resulted in a compositionally modified ancient crustal basement.On the contrary,the southeastern Altaids domain manifests crustal complexity in compositions and structures inferred to be indicative of a juvenile crust of the Phanerozoic accretionary orogen.Our results provide deep physical-property constraints that shed new light on the crustal evolution of a complex craton margin.

关 键 词：North China Craton ALTAIDS crustal composition receiver function joint inversion continental reworking 

分 类 号：Q915.2[天文地球—古生物学与地层学]