现代地质2025，Vol.39Issue(3)：728-751,24.DOI:10.19657/j.geoscience.1000-8527.2024.112
华北克拉通中部菅等岩体的成因及构造意义:锆石U-Pb年代学、岩石地球化学的约束
The Genesis and Tectonic Significance of Jiandeng Intrusive Rock in the Central North China Craton:Constraints from Zircon U-Pb Chronology and Petrogeochemistry
摘要
Abstract
Accurately constraining the basement formation and metamorphic deformation age of the North China Craton is the key to understanding the early tectonic evolution of the North China Craton.The Jiandeng intrusion is located in the Zanhuang complex in the southeast member of the central orogenic belt of the North China Cra-ton,which is～2.5 Ga granite and has undergone multi-stage metamorphism and deformation.A detailed mul-tidisciplinary study on Jiandeng intrusion and associated undeformed pegmatites,coarse-grained deformed gran-ite,fine-grained deformed granite,and granitic stock within Jiandeng intrusion includes field investigation,pe-trography,petrogeochemistry,and zircon U-Pb chronology.The results show that the main lithologies are gneiss syenogranite and monzogranite pegmatite for undeformed pegmatites.The lithologies of the other three intrusions are syenogranite.The geochemical characteristics of jiandeng intrusion and veins show high Si,rich in K and al-kali elements contents,low Ti,Fe,Mg and Ca content,and rich in large ion lithophilic element Rb but defi-cient in high field strength element Ti.The Rb/Sr ratio ranges from 0.75 to 1.56,indicating crustal source characteristics.High Al and low Ti,and high Pb and low Th in magmatic zircon,further indicate that the Jian-deng intrusion belong to peraluminous S-type granite.LA-ICP-MS dating of zircon shows that there are～2.5 Ga and～2.3 Ga granite magmatic events.Veins magmatic activity can be divided into three stages,with the first three stages formed at～2.5 Ga,～2.3 Ga,and～2.1 Ga,respectively.The fine-grained deformed gran-ite records a metamorphic event at 1897±17 Ma.The tectonic evolution of the North China Craton is driven by a combination of multi-stage magmatic intrusions and metamorphic events.The formation of the Jiandeng intru-sion at～2.5 Ga marks the formation of a unified basement,indicating an early tectonic stabilization process.The Paleoproterozoic granite intrusions(2.3 Ga and 2.1 Ga)revealed a cracking-extensional event within the craton,and the metamorphic event of～1.85 Ga represented a subduction collision process between the eastern and western land masses.关键词
菅等岩体/S型花岗岩/岩石地球化学/华北克拉通Key words
Jiandeng intrusion/S-type granite/petrogeochemistry/North China craton分类
天文与地球科学引用本文复制引用
吴晓贺,张聚全,段站站,张乐民,温雨菁,郭子桤,李清..华北克拉通中部菅等岩体的成因及构造意义:锆石U-Pb年代学、岩石地球化学的约束[J].现代地质,2025,39(3):728-751,24.基金项目
河北省自然科学基金项目(2021403028) （2021403028）
河北地质矿产勘查开发科研基金项目(13000022P0032910103R) （13000022P0032910103R）
河北地质大学第二十届学生科研基金项目(KAY202402) （KAY202402）
河北省自然资源厅地勘项目(13000022P00F2D4101216 （）
13000023P00F2D410251H) （）
河北地震局震防中心项目(HBHY(2023)-02-38)联合资助. （HBHY(2023）
