• 责任者：Zou Siyuan (Department of Earth Sciences ; Zhejiang University ; Hangzhou 310027 ; China) ; Li Zilong
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(10)
• 关键词：沉积岩 ; sedimentary rocks ; 铀—铅计时 ; U-Pb dating ; 塔里木盆地 ; Tarim Basin
• 页码：p.3369-3388
• 图表：7 illus., 2 tables, 80 refs.
• 分类号：0803
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     The Early Permian Tarim Large Igneous Province （TLIP） is regarded as an important large igneous province in China. Study of the geochronology and Hf isotopic compositions of detrital zircons from sedimentary rocks as intedayers of large-scale flood basaltic lavas can provide important implication on the magmatic evolution of TLIP. Three samples from the different sedimentary layers in laminated siltstones among the basalts of the Yingan section in Keping area of Tarim Basin were selected for the U-Pb dating analysis of Hf isotopic compositions of detrital zircons using LA-MC-ICP-MS analyses. Three samples of sedimentary rocks yielded the youngest peak age ranging between 284Ma and 291Ma, coincided with the geological event of the Early Permian TLIP reported previously. In addition, there are other age clusters of 410 ～450Ma, 750 ～ 850Ma, 0. 9 ～ 1.0Ga and older than 1.7Ga, probably corresponding to the Tarim Silurian strata denudation and sediment, breakup and assembly of Rondina supercontinent, and assembly of Columbia supercontinent respectively. Based on the analyses of zircon Hf isotopic compositions of three sedimentary rock samples, the source materials of detrital zircons are complicated, mainly from the Precambrian basement, Silurian strata and Early Permian TLIP. The εHf（t） value of Permian zircons was -10-4 with the average value of -4. 8, and the tDM^Hf（depleted- mantle model age） of Hf isotopes between 1363Ma and 801Ma were yielded, illustrating that detrital zircons may be from the old enrichment lithosphere mantle. The study of zircon U-Pb geochronology and Hf isotopic compositions from these sedimentary rocks provided the better understanding of the Early Permian TLIP magmatic evolution.