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本文记述黔中乌当地区志留纪的喀斯特岩岸,是我国前第四纪岩岸实例的首次报道。志留纪海水始于Llandovery世Aeronian晚期浸漫本区并逐级超覆在奥陶纪不同时代的地层之上,形成了一个穿时性喀斯特不整合面,这是宜昌运动和其后长期风化剥蚀、产生强烈地形高差的结果。根据地层发育及不整合面上的沉积和生物特征,肯定喀斯特岩岸在本区的存在,推断岩岸的生物生存环境、海平面升降变化以及宜昌运动对贵州中、南部古地理的强烈影响。黔中、黔南因受其影响,地壳升隆使奥陶纪沉积层在成岩作用之后、志留纪海侵之前,向今日之北方作小角度(经常小于1°)的倾斜,使当时呈水平状态的志留纪沉积向南穿时超覆在老地层之上。
This article describes the Karst rocky shoreline of the Silurian in the Wudang area, central Guizhou, and is the first report of an example of the Pre-Quaternary rocky shores in China. The Silurian seawater began in the Late Aeronian area of the Llandovery and overlying the strata of different Ordovician ages, forming a peridotonal karst unconformity, which is the result of Yichang movement and subsequent long-term weathering Erosion, the result of a strong terrain elevation difference. According to the sedimentary and biological characteristics of the stratigraphic development and unconformity, it affirms the existence of karst rocky in this area, deduces the biological living environment of rocky bank, the sea level change and the strong influence of Yichang Movement on the paleogeography of the middle and southern part of Guizhou. In Qianzhong and Qiannan, due to the influence of the crust, the uplifting of the crust caused the Ordovician sediments to dip slightly (often less than 1 °) to the north of today before dipping in the Silurian, Silurian sediments in the horizontal state overtop the old strata as they traverse south.