论鄂尔多斯盆地中央古隆起对石炭-二叠纪聚煤作用的控制  

Study on Central Paleouplift Control on Permo-Carboniferous Coal Accumulation in Ordos Basin

作　　者：雷小乔[1] Lei Xiaoqiao(China National Administration of Coal Geology,Beijing 100038)

机构地区：[1]中国煤炭地质总局,北京100038

出　　处：《中国煤炭地质》2020年第5期1-6,共6页Coal Geology of China

摘　　要：鄂尔多斯盆地中央古隆起自中元古代起即已存在,早古生代演化为庆阳古隆起和其北部的前鄂托克旗-靖边鞍部隆起联合而成的"L"形隆起,晚古生代在华北板块北缘持续隆升的构造背景下,来自于东西两侧的华北海与祁连海相向向中央古隆起区超覆,海水与古隆起交界处形成的滨海相及海陆交互相平行于古隆起分布,形成了鄂尔多斯盆地厚煤带沿中央古隆起东西两侧及北侧、富煤带位于东北部的整体煤分布格局,其中以晚石炭世太1顶部的11煤、早二叠世早期全煤和早二叠世晚期山西组底部的5煤为主。11煤分布于盆地东经109°以东的北部区域、太2段随最大海进的到来全煤层推进至东经109°~107°、山西组海退时随海水撤出煤层退至全盆地除东径107°~109°、北纬38°以南地区外的所有区域。晚石炭世-早二叠世煤分布受中央古隆起的控制作用明显,但随时间推进控制在逐步减小。Ordos Basin central paleouplift has been existed since the Mesoproterozoic Era,during Early Paleozoic has evolved into Qingyang paleouplift and its north part Otog Front Banner-Jingbain saddle uplift consociated"L"type uplift.In Late Paleozoic under North China plate northern margin sustained uplift background,the north China sea and Qilian sea from east and west had overlapped on the central paleouplift at the boundary between sea water and paleouplift formed littoral facies and alternating marine-continental facies distributed parallel to paleouplift,and formed overall distribution pattern of Ordos Basin thick coal belt along the central paleouplift east,west and north sides;coal-rich belt in northeast part.In which,the coal No.11 in Late Paleozoic Taiyuan Formation First Member top part,earlier Early Permian coal seams and later Early Permian Shanxi Formation bottom part coal No.5 are most important.Coal No.11 has distributed in basin north part to the east of east longitude 109°,the Taiyuan Formation Second Member along with the maximum transgression all coal seams pushed into east longitude 109°~107°region;Shanxi Formation along with regression coal seams retreated to all basin besides east longitude 107°~109°to the south of north latitude 38°other regions.The distribution of Late Carboniferous-Early Permian coal seams is obviously controlled by central paleouplift,but the control reduced gradually along with time push on.

关 键 词：晚古生代 中央古隆起 层序地层 构造-古地理 沉积相 

分 类 号：P56[天文地球—构造地质学]