鲁西淄博盆地的中侏罗系锆石年代学及其意义

Ages of middle-upper Jurassic zircon in Zibo basin,Luxi uplift and their implications

淄博盆地位于鲁西隆起上,文章采自淄博盆地中侏罗系砂岩样品碎屑锆石的LA-ICPMS U-Pb年龄范围为162~2 603 Ma,反映了淄博盆地物质源区的复杂性。此时期,淄博盆地的物质来源主要为鲁东地块,其次为鲁西隆起,碎屑锆石年龄为250~162 Ma;锆石年龄392~269 Ma在鲁西隆起和鲁东地块均未发现相应的年龄,有待进一步研究;年龄为2 603~846 Ma锆石可能为华北克拉通基底物质。

The Zibo basin is situated in the Luxi uplift.The detrital zircon LA-ICPMS U-Pb is sampled from the middle-upper Jurassic sandstone layer of the basin,and the age range of this sample is from 162 Ma to 2 603 Ma,which shows the complex detrital provenance of Zibo basin.During this period,the detrital provenance of Zibo basin is firstly from Ludong terrace,the second is Luxi uplift,and the zircon ages is 250-162 Ma.The corresponding zircon age of 392-269 Ma is not found in Luxi uplift and Ludong terrace,which needs further study.The zircon with the age of 2 603-846 Ma may be the substrate material from North China Block.