沉积与特提斯地质2024，Vol.44Issue(3)：613-629,17.DOI:10.19826/j.cnki.1009-3850.2024.01001
四川盆地西北部中侏罗统沙溪庙组物源:碎屑锆石U-Pb年代学的证据
Study on U-Pb age and provenance of detrital zircons from sandstones of the Shaximiao Formation,northwestern Sichuan Basin
摘要
Abstract
The U-Pb dating of detrital zircons from three sandstone samples of the Shaximiao Formation reveals five age groups:2660～2300 Ma,1905～1738 Ma,1690～1442 Ma,866～811 Ma,and 298～160 Ma.By comparing the ages of zircons from different blocks(or bodies)in the surrounding areas and combining relevant regional geological data,it is found that the detrital zircons with ages of 2660～2300 Ma and 1905～1738 Ma are mainly from the southern Qinling orogenic belt and the northern margin of the Yangtze Plate,and slightly from the Bikou terrane and the Songpan-Ganzi terrane.Detrital zircons with ages of 1690～1442 Ma come from the Wuguan Group,the Wudang Group,and the Bikou complex.Detrital zircons with ages of 866～811 Ma are mainly derived from the northern margin of the Yangtze Craton,the Bikou Group,and the South Qinling orogenic belt.Detrital zircons with ages of 298～160 Ma mainly come from the South Qinling orogenic belt and the Late Triassic Songpan-Ganzi terrane.Evidences show that the sediment provenance of the Shaximiao Formation is mainly derived from the South Qinling orogenic belt and the Songpan-Ganzi fold belt,and partly from the Yangtze Craton.The uplift of the South Qinling ended before the sedimentation of the Shaximiao Formation,thus blocking the sediment input from the North Qinling and the south margin of the North China Plate.关键词
川西北/碎屑锆石/U-Pb定年/物源分析/沙溪庙组Key words
northwestern Sichuan Basin/detrital zircon/U-Pb dating/provenance analysis/Shaximiao Formation分类
天文与地球科学引用本文复制引用
陈伟伟,牟传龙,王启宇,姚升阳,任鹏..四川盆地西北部中侏罗统沙溪庙组物源:碎屑锆石U-Pb年代学的证据[J].沉积与特提斯地质,2024,44(3):613-629,17.基金项目
中国地质调查局项目(DD20221661) （DD20221661）
中国石油天然气股份有限公司西南油气田分公司项目(XNS川西北矿JS2022-101) （XNS川西北矿JS2022-101）
