古地理学报2013，Vol.15Issue(1)：59-68,10.DOI:10.7605/gdlxb.2013.01.006
湖南地区晚奥陶世桑比期—凯迪期早期沉积特征及沉积模式
Sedimentary characteristics and depositional model in the Sandbian-Early Katian Ages of Late Ordovician in Hunan area
摘要
Abstract
Hunan area is located between the Yangtze and Cathaysia Blocks. According to its petro-logic characteristics, archeological features and other depositional features, this area can be divided into open carbonate platform, shallow marine shelf, deep-water basin and shelf-margin-slope facies in the Sandbian-Katian Ages of Late Ordovician. The open carbonate platform facies was characterized by the deposition of "chap-cracked" limestones and nodular limestones, while the shallow marine shelf deposi-ted mainly sandy slate, slate with siltstone and marl interbeds. The deep-water basin was composed of black carbonaceous shale and radiolarian-bearing silicolites with thin thickness, which reflected a withle-ad, anoxic and uncompensated deep water environment. The shelf-margin-slope facies deposited lithic quartz silt-fine sandstone, feldspar quartz silt-fine sandstone with slate interbeds, which showed typical features of turbidite deposits with more than kilometers sedimentary thickness. The water was increasing gradually in the central Hunan area (from northwestern to southeastern) during the Sandbian-Early Ka-tian Ages of Late Ordovician, and the southern-central Hunan area was the deepest area.关键词
湖南地区/晚奥陶世桑比期—凯迪期早期/沉积相/沉积模式Key words
Hunan area/Sandbian - Early Katian Ages of Late Ordovician/sedimentary facies/depositional model分类
天文与地球科学引用本文复制引用
葛祥英,牟传龙,周恳恳,梁薇..湖南地区晚奥陶世桑比期—凯迪期早期沉积特征及沉积模式[J].古地理学报,2013,15(1):59-68,10.基金项目
国家重大科技专项"全国油气基础地质编图"(编号:2008ZX05043-005)和中国地质调查局项目"中国岩相古地理编图"(编号:1212010916060)共同资助 （编号:2008ZX05043-005）
