Characteristics and Genesis of the Oncolites from the Jurassic Strata in the Qiangtang Basin

• 责任者：Peng Zhimin (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Liao Zhongli
• 刊名：Sedimentary Geology and Tethyan Geology
• 出版年：2010
• 卷期：30(3)
• 关键词：核形石 ; oncolites ; 羌塘盆地 ; Qiangtang Basin
• 页码：p.109-112
• 图表：5 illus., 11 refs.
• 分类号：0603
• issnNo：ISSN1009-3850
• isbnNo：CN51-1593/P

 Unlike common oncolites, no laminated structures and no algal organisms are observed in the coatings of the oncolites from the Jurassic strata in the Qiangtang Basin. The cores generally contain bioclastics of varying sizes. Both the oncolites and their interstitial materials consist of micritic calcite. The oncolites occur mainly in the lower-energy lagoon and restricted shelf environments.