西北地质2025，Vol.58Issue(5)：123-139,17.DOI:10.12401/j.nwg.2025079
宗务隆构造带东段宗务隆群碎屑锆石年代学及其构造意义
Detrital Zircon Geochronology of the Zongwulong Group in the Eastern Segment of the Zongwulong Tectonic Belt and Its Tectonic Significance
摘要
Abstract
The Zongwulong tectonic belt is situated at the northeastern margin of the Tibetan Plateau,con-strained between the South Qilian,North Qaidam margin,and West Qinling tectonic belts.Its tectonic evolution is closely associated with the northeastern Tethyan tectonic domain.Current academic debates persist regarding the formation age of the Zongwulong Group,its material provenance,and the evolutionary history of the tecton-ic belt.This study focuses on the clastic rocks of the Zongwulong Group in the eastern segment of the tectonic belt,employing detrital zircon U-Pb geochronology,trace element analysis,and Hf isotopic composition investi-gations.Results demonstrate that the depositional age of the Zongwulong Group postdates the Middle Permian.Detrital zircon U-Pb ages predominantly cluster in the Early Paleozoic and Late Paleozoic,with prominent peaks at～431 Ma and～269 Ma.Trace element characteristics indicate that these detrital zircons originated from arc-related continental crustal sources,correlating with magmatic activities in the southern Wulan-Qinghai Nanshan region.Comparative analysis of age spectra reveals distinct tectonic evolutionary processes between the eastern and western segments of the Zongwulong belt.The eastern segment developed a limited oceanic basin,potential-ly representing the northernmost branch of the Paleo-Tethys Ocean,whereas the western segment shows no evi-dence of oceanic basin development.关键词
宗务隆群/碎屑锆石/Hf同位素/宗务隆构造带Key words
Zongwulong Group/detrital zircon/Hf isotope/Zongwulong tectonic belt分类
天文与地球科学引用本文复制引用
赵文涛,王雁鹤,李健,王根厚,钱荣毅,李鹏胜..宗务隆构造带东段宗务隆群碎屑锆石年代学及其构造意义[J].西北地质,2025,58(5):123-139,17.基金项目
青海省"昆仑英才·高端创新创业人才"项目(2023),中国地质调查局项目"祁连成矿带金矿资源潜力动态评价"(DD20220979)联合资助. （2023）
