峨眉地幔柱与西南(贵州)晚二叠世成煤条件及成煤区带划分探讨

Discussion of Emei Mantle Plume and Late Permian Coal Forming Conditions and Coal Forming Zones in Southwest (Guizhou)

发生在二叠纪阳新世晚期-乐平世早期的峨眉地幔柱重大地质事件,直接或间接导致了我国西南地区晚二叠世大规模成煤作用。本文基于《中国矿产地质志·贵州卷·煤》的研编工作,阐述峨眉地幔柱事件产生的系列地质环境效应,使中泥盆世—中二叠世陆内断陷盆地转变为晚二叠世有利聚煤的被动大陆边缘盆地,奠定了贵州晚二叠世大规模聚煤的沉积盆地基底,改变了晚二叠世的气候,形成利于植物生长异常繁茂和森林生态环境、为聚煤成煤提供了丰富的木本。进而依据层级结构,将晚二叠世成煤区带划分为Ⅰ级成煤区(聚煤区),Ⅱ级成煤区(含煤区),Ⅲ级成煤区(储煤带),Ⅳ级成煤区(煤田)。

The Emei mantle plume and the division of Late Permian coal-forming conditions and coal-forming zones in southwestern China(Guizhou)occurred during the major geological event of the Emei mantle plume from the late Yangxin to early Leping periods of the Permian,directly or indirectly leading to the large-scale coal-forming process of the Late Permian on the Earth in southwestern China.In this paper,based on the research and compilation work of the‘Geology of Mineral Resources of China Guizhou Volume’,Coal".It elaborates on the series of geological environmental effects generated by the Emei mantle plume event,which transformed the intracontinental fault basin from the Middle Devonian to the Middle Permian into a passive continental margin basin favorable for coal accumulation in the Late Permian,laid the foundation for the large-scale coal accumulation sedimentary basin in Guizhou during the Late Permian,and changed the climate of the Late Permian,The formation of an exceptionally lush plant growth and forest ecological environment provides abundant woody resources for coal accumulation.Furthermore,based on the hierarchical structure,the Late Permian coal-forming zone is divided into Class I coal-forming zone(coal accumulation zone),Class II coal-forming zone(coal bearing zone),Class III coal-forming zone(coal storage zone),and Class IV coal-forming zone(coal field).