Provenance Study on Sediments in the Gahai Basin of the Songpan and its Geological Significance

详细信息   

• 责任者：Ge Yukui (State Key Laboratory of Geological Process and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Chengshan
• 刊名：Geotectonica et Metallogenia
• 出版年：2012
• 卷期：36(2)
• 关键词：片麻岩 ; gneisses ; 湖北 ; Hubei Province
• 页码：p.301-311
• 图表：5 illus., 17 tables, 3 refs.
• 分类号：0802
• issnNo：ISSN1001-1552
• isbnNo：CN44-1595/P

摘要

The Songpan-Ganzi fold belt in central China is located in the junction of the Qiangtang Block, North China Block and Yangtze Block. The research of the Gahai Basin provides significant information about the evolution of the Jurassic and Cretaceous sedimentation. Using detrital zircon geochronology and Dickinson triangular plots, distinct sediment sources of the Relu Formation can be distinguished in the Gahai basin which is in the Bailongjiang uplift of Songpan-Ganze block. The types of detritus and quartz indicate that the provenance is mainly metamorphic rocks, with low compositional and textural maturities. The source originates from the quartzose recycled origin and transitional recycled origin as exhibited in tile Dickinson triangular plots. The youngest concordant age of the detrital zircons from the Relu Formations is 137 Ma, which indicates that the Relu Formation was developed in Late Cretaceous. The results show that the detrital zircons in the Relu Formation were inheritance from the Triassic strata in Songpan-Ganze area. It suggests that the provenance of the Relu Formation was mainly derived from recycled Triassic sedimentary of the Songpan-Ganze complex near Bailongjiang uplift.