地质科学2012，Vol.47Issue(1)：240-250,11.
锆石裂变径迹年龄对济阳坳陷新生界源区构造背景的指示意义
Indicating significance of Cenozoic zircon fission track ages of the Jiyang depression to its provenance and tectonic background
摘要
Abstract
Zircon fission track analyses of sediments of sedimentary basins can be used to trace its provenance characters and tectonic evolutional history. Central ages of zircon fission tracks of 9 Cenozoic sandstones from the Jiyang depression arrange from 183. 1 ± 15. 0 Ma to 100. 1 ± 5. 6 Ma,and all the single zircon grain age is bigger than its strata depositional age. Multiple component analyses of zircon fission track ages were calculated to the 6 samples which were not passed by χ2 -Test, and the results show that most sandstone samples mainly consist of two age components. As a whole,single component of zircon fission track ages of the 9 sandstones show a good coherence, and these can be concluded into four components which arranges from 389. 1 ±5. 1 Ma to 272.7 ±14. 6 Ma(Pl), 238. 1±7.8 Ma to 203. 6±6. 6 Ma(P2), 179. 3±13. 9 Ma to 96. 8± 17. 8 Ma ( P3 ), and 80. 3 ± 15. 7 Ma to 55. 3 ± 6. 0 Ma ( P4 ) respectively. The four components record the entire annealing ages of zircon grains in the Late Paleozoic, Triassic, Late Cretaceous-Paleocene and Early Cretaceous respectively. Combined with regional geological background, it can be concluded that volcanic rocks and volcano-clastic rocks of the Upper Jurassic to Lower Cretaceous strata which were formed due to the intense tectono-magmatic activation of the Middle Yanshannian Movement are the chief provenance to Cenozoic strata of the depression; meanwhile, the tectono-magmatic activations which are attributed to the Hercynian, the Indosinian, and the Late Yanshannian to Early Himalaya Movements also have a few provenance contribution to those of the Jiyang depression.关键词
锆石裂变径迹/物源/构造演化/济阳坳陷Key words
Zircon fission track/Provenance/Tectonic evolution/Jiyang depression分类
天文与地球科学引用本文复制引用
刘士林,肖焕钦,林舸,郑和荣,王毅..锆石裂变径迹年龄对济阳坳陷新生界源区构造背景的指示意义[J].地质科学,2012,47(1):240-250,11.基金项目
国家自然科学基金项目(编号:40773004)资助. （编号:40773004）
