湖北东南部晚二叠世龙潭早期的沉积环境及聚煤作用

湖北东南部西临江汉平原,北抵襄广断裂及郯庐断裂,东南大致以省境线为界(图1),是我省的重要煤产地之一。1986-1987年,笔者和彭安群、汪颂桥等在这一地区研究了近20条上二叠统含煤岩系的沉积剖面,采集了部分样品,通过分析研究,对本区龙潭早期的沉积环境及聚煤作用有了初步的认识。

SEDIMENTARY ENVIRONMENTS AND COAL-ACCUMULATING PROCESSES IN SOUTHEASTERN HUBEI DURING THE EARLY LONGTANIAN(LATE PERMIAN)

The Upper Permian coal-bearing series in southeastern Hubei were deposited during the early Longtanian (Late Permian). Three facies belts or eight facies are suggested for the coal-bearing series. Two coal measures have also been distinguished:the Longtan coal measures in the northern part of the study area and the Wujiaping coal measures in the southern part of it. The former consist mainly of open sea, restricted sea, barrier bar, lagoon, tidal channel, tidal flat, peat flat and eluvial facies, whereas the latter are composed dominantly of eluvial, tidal flat, peat flat and open sea facies. The coal-bearing series in this region contain three coal seams which were mainly accumulated on the peat flat. The crucial factors to controll coal-accumulating processes include reactivation of basement faults and differential movement of basal fault blocks. The Huangshi-Qiyue mining district is thought to be a coal-accumulating centre in southeastern Hubei because there are favourable conditions for coal accumulation in the region.