海洋地质前沿2025，Vol.41Issue(7)：54-65,12.DOI:10.16028/j.1009-2722.2024.067
渤海东北部辽东凸起锦州27构造沙河街组碎屑锆石物源示踪
Source tracing of detrital zircons from Shahejie Formation of the Jinzhou 27 Structure in Liaodong Uplift,northeastern Bohai Sea
摘要
Abstract
Development of sand bodies in the Shahejie Formation(SF)in the Jinzhou 27 Structure of the Liaodong Uplift in the northeast of Bohai Sea showed rapid lateral changes,thus conducting source tracing is of great significance for clarifying the distribution of sand bodies.By analyzing the zircon U-Pb age,zircon morpho-logy,and debris composition of the sandstone in the study area,the age,type,and source area of the parent rock of the SF in the study area were clarified.Results indicate that:① The SF mainly develops Cretaceous zircons with peak ages of 120 Ma and Paleoproterozoic zircons with peak ages of 1 800 Ma and 2 500 Ma.Zircons from the Cretaceous period are mostly columnar in angular shape with growth rings.The Paleoproterozoic zircons are mostly round in shape,with indistinct edges and corners,and their growth rings are often damaged.② In the fourth member of SF,the proportion of Paleoproterozoic zircons in sandstone was 55%,and that of Cretaceous zircons was 25%.The rock fragments were mainly from metamorphic rocks.From the third to first and second members of SF sediments,the proportion of Paleoproterozoic zircons in sandstone was 44%,and that of Creta-ceous zircons was 33%.The rock fragments were mainly from volcanic rocks and metamorphic rocks.③ The par-ent rock of SF is mainly composed of Neoproterozoic sedimentary rocks in the northern part of Fuzhou in the Jiao-liao Uplift.At the same time,influenced by the continuously uplift of Liaodong Uplift,the influence of the provenance of Cretaceous volcanic rocks in the basin area gradually increased.关键词
锆石定年/物源分析/沙河街组/辽东凸起Key words
zircon dating/source analysis/Shahejie Formation/Liaodong Uplift分类
海洋科学引用本文复制引用
耿名扬,刘志峰,雷杭山..渤海东北部辽东凸起锦州27构造沙河街组碎屑锆石物源示踪[J].海洋地质前沿,2025,41(7):54-65,12.基金项目
国家重点研发计划"板块俯冲驱动下的流体循环机制及其效应"(2022YFF0800403) （2022YFF0800403）
