Characteristics of Ordovician sedimentation and the discovery of storm deposition in the Wangcang area , northern Sichuan
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摘要:
为了厘清上扬子北缘奥陶系古地理格局与沉积环境，在川北旺苍地区奥陶系沉积相研究基础上，选择大两会剖面作为研究对象，通过野外剖面实测与室内薄片的详细分析，对旺苍地区奥陶系沉积相进行精细划分。结果表明，大两会剖面奥陶系地层主要发育赵家坝组、西梁寺组、宝塔组、五峰组。赵家坝组与西梁寺组主要发育海岸相的潮坪亚相；宝塔组主要发育浅海相的碳酸盐岩台地亚相；五峰组主要发育浅海相的陆棚亚相，并依次划分出多个次相。首次在西梁寺组潮坪亚相中发现风暴沉积，风暴沉积构造主要包括底面侵蚀构造、砾屑层、粒序层理、平行层理、丘状交错层理等，并识别出4种风暴沉积序列。因此，上扬子北缘中奥陶纪处于海岸环境的低纬度飓风地带，晚奥陶纪处于浅海环境。
Abstract:To clarify the sedimentary pattern and environment of the Ordovician strata in the northern margin of the Upper Yangtze Block, the Dalianghui section was selected as the research profile. Combining the previous studies of the sedimentary facies of the Ordovician strata with detailed profile surveys and microscopic observations in the Wangcang area of the north Sichuan Basin, we conducted a fine division of these sedimentary facies of the Ordovician strata. Results show that the Dalianghui section can be divided into four formations, which are the Zhaojiaba, Xiliangsi, Baota, and Wufeng formations. The lithofacies of the Zhaojiaba and Xiliangsi formations feature tidal flat subfacies of coastal facies, while the Baota Formation is dominated by carbonate platform subfacies of neritic facies. The lithofacies of the Wufeng Formation feature shelf subfacies of neritic facies, which can be further divided into several suborder facies. In this study, storm sedimentary structures were first identified, which mainly consist of scouring-fill structures, storm-generated gravelstones, rip-up clasts, parallel bedding, graded bedding and hummocky cross-bedding. Four types of tempestite sequences were also identified. Therefore, it is suggested that the northern margin of the Upper Yangtze Block was located in the low-latitude hurricane zone of the coastal environment in the Early to Middle Ordovician, and changed into a shallow marine environment in the Late Ordovician.
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Key words:
- Sichuan Basin /
- Ordovician /
- sedimentary features /
- sedimentary facies /
- storm deposits
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