an; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-outline-level: 2" class=MsoNormal>ang=EN-US>The Characteristics of Middle Ordovician Contour Current Deposits and Geological Implication in Fuping Region, Shaanxi Province, China

• 责任者：Qu Hongjun (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Mei Zhichao
• 刊名：Geological Bulletin of China
• 出版年：2010
• 卷期：29(9)
• 关键词：碎屑 ; clasts ; 砂岩 ; sandstone ; 陕西 ; Shaanxi Province
• 页码：p.1294-1303
• 图表：3 illus., 2 plates, 32 refs.
• 分类号：0803
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

AN style="FONT-SIZE: 14pt" lang=EN-US>In Fuping Zhaolaoyu region of Shaanxi Province, Middle Ordovician Zhaolaoyu Formation developed a suite of contourites. According to their lithologic characteristics, the contourites can be classified into four types, respectively psephitic contourite, calcarenitic contourite, calcisiltitic contourite, and calcilutitic contourite.Four types of contourite sequences were identified. The contour current was from northeast to southwest, which suggested that middle Ordovician Fuping region may be a northeastern abyssal anterior trough in Middle Ordovician epoch, developing from arc rear basins on the north of Qinling fingering into shallow plateau. In Fuping-Zhaolaoyu region, Low Ordovician Majiagou Formation, like other regions of Huabei block, developed shallow plateau facies carbonate.