Study On The Late Palaeozoic Carbonate Sedimentary Facies And Palaeogeography In North China Platform Within Henan Province

This paper analyzes the area by observing the five main sections of limestone flakes and collected in the region 13 the thickness of hole or outcrop information, and southeastern Shanxi, Hebei and other external data points south of the data, carried out on the carbonate salt sedimentology and palaeogeography of. Main knowledge obtained as follows:Through observation and analysis of the eight main sections of this region of limestone flakes and collected in the region 13 the thickness of hole or outcrop information, and southeastern Shanxi, Hebei and other external data points south of the data, carried out on the carbonate salt sedimentology and palaeogeography of the study. Main knowledge obtained as follows:1,The area is divided into five carbonate microfacies are micrite microfacies, including bioclastic micrite facies, bioclastic micrite facies, bioclastic micritic limestone facies and bioclastic limestone with micritic microfacies.2, The Late Carboniferous Early Permian depositional environments and facies were set aside two large sedimentary system. Restricted platform carbonate platform system including phase and open platform. Restricted platform facies rocks characterized by micrite, containing bioclastic micrite and bioclastic micrite main output common marl, rock containing clay and organic matter have plans. With horizontal bedding, wavy bedding, or bedding block. Open platform facies metamorphic rocks are massive micritic bioclastic limestone and bioclastic limestone, with massive bedding, convolute bedding and graded bedding biological debris. Fossils abundant variety. Barrier in this area - the main causes of the lagoon depositional system with a combination of barrier islands, tidal channel, tidal lagoon and its coastal zone and combination. The main part of the tidal flat in the intertidal zone, and can be divided into intertidal sand flat, mixed flat and mud flat, tidal mud flat on the Belt extends mainly with peat flat, tidal channel mainly located in the intertidal - subtidal band. Lagoon sediments are mostly gray, gray and black mudstone, sandy mudstone. Thick barrier island with rocks to the middle layer of thick, coarse-grained quartz sandstones, there are fine-grained quartz sandstone.3, The main Late Carboniferous epicontinental sea environment, the distribution pattern is: in the vast area mainly for the lagoon area of distribution; Hebi, Puyang and the north is mainly restricted platform, lagoon, mixed-phase region; barrier Island-phase region is more developed only in the Hebi region, not tidal distribution, sand flat is not developed, mainly mud flat and mixed flat. Early Permian-phase region the distribution as: Anyang - Qi County - Kaifeng - Shangqiu main line north of the lagoon - barrier island facies; that Hill - Yuzhou - Dengfeng - Jiaozuo - Zhengzhou - Zhecheng mainly confining zone carbonate platform facies; this area north and east with the Anyang - Qi County - Kaifeng - Shangqiu line between the platform - lagoon mixed phase region; Jiyuan - Xin - Yiyang - Ikawa - Yu Chau line west of the tidal flat phase region, in addition to Hebi West, Puyang and other places also distributed in the tidal zone; the facies between the same platform area for the platform - the main tidal mixed phase region, between a barrier island and lagoon area; tidal-flat facies distributed in the West, the South showed a narrow distribution width north, north Mianchi, Jiyuan, Xinan tidal flat along the developmental context of the tidal channel facies.