桂西北隆或地区晚古生代地层沉积特征及 台地沉积演化.

There are isolated carbonate platforms of different scales in Late Palaeozoic of Youjiang Basin. Longhuo platform is a small platform in the northwestern of the basin. The studies indicate that two facies regions and seven kinds of sedimentary facies can be identified. There are mainly isolated platform facies region, slope-basin facies region, and restricted platform, open platform, shoal of platform margin, reef of platform margin, the trench facies in platform, front slope of carbonate platform and deep water basin between platforms facies. The isolated carbonate platforms, most bred in early Devonian and submerged in the Early Triassic, can be divided into four evolutional stages, embryonic stage (D1 -D2 ), forming stage (D3), sustained development stage (C1-P2 ) and submerged stage (P3 -T1 ). During the Late Paleozoic period, the Youjiang Basin evolved from rifting to a small oceanic basin with intensive expansion and subsidence, while the southern margin of the Yangtze Platform experienced extension and breaking splitting. The formation and evolution of the platform are closely related to the tectonic evolution of Youjiang Basin, and are also affected by the global sea level rise and fall, and the input of terrigenous materials in the basin. [ABSTRACT FROM AUTHOR]