Radiolarian Siliceous Rocks and Palaeoenvironmental Reconstruction for the Upper Ordovician Wufeng Formation in the Middle-Upper Yangtze Area

• 责任者：Liu Wei (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Xu Xiaosong
• 刊名：Sedimentary Geology and Tethyan Geology
• 出版年：2010
• 卷期：30(3)
• 关键词：放射虫类 ; radiolarians ; 硅质岩 ; silicolite ; 扬子地区 ; Yangtze Region
• 页码：p.65-70
• 图表：6 illus., 18 refs.
• 分类号：0603
• issnNo：ISSN1009-3850
• isbnNo：CN51-1593/P

Abundant radiolarian fossils were discovered in the siliceous rocks from the Wufeng Formation in Zhuazhuayan, Leibo, Sichuan.  This discovery indicates that the silica-rich sea water once entered into the Yangtze craton in response to the second phase of marine trangressions during the Wufengian of the Late Ordovician, resulting in the deposition of radiolarian siliceous sediments.  It also implies that there once existed the channels connected the Bayan Har Sea with the Xikang-Yunnan old land and the central Sichuan palaeo-uplift on the western margin of the Yangtze craton.