摘要
(一)引言 慈利、石门两县位于湖南省武陵山脉之西北部(即湘西北),与湖北西南部之鹤峰、五峰、宜都等县相邻接。在大地构造单位上,与川东南、黔东北、鄂西同属于华南地块上之川鄂台凹。湖南泥盆纪海浸,前所知者,仅限于雪峰山脉以南,而山脉之西北一向则未有发现。
The Devonian Rocks in Tzeli-Shihmen Area,N.W.Hunan,may be grouped into three divisions,the Yuntaikuan quartzose sandstone of the lower and middle Devonian.the Huangiadang Series and Hsiehkingssu Series of the upper Devonian,The sections dealt with in the present paper were made by the writers during their geological excursion in 1958,the Devonian of these areas have never been found since then.In this paper the subdivisions of the Devonian strata in the discending order are summarized as follows:(1)The Yuntaikuan quartzose sandstone:It lies disconformably upon the upper Silurian Shamao Series.Total thickness ranges from 60-120m.(2)The Huangiadang Series:Th Huangiadang Series is composed of greyish-green thick-bedded sandstone and light grey of whitish grey micaceous shale and banded quartzose sandstone,intercalated with iron-oolitic beds.Plant remains as Dicranophyton sp.,Taenoicarda sp.and Lingula sp.are found.This Series is conformable with both the Yuntaikuan quartzose sandstone below and the Hsienkingssu Series above.Thickness about 8-10 m.(3)The Hisehkingssu Series:The Hsiehkingssu Series is estimated about 5-60 meters in thickness.This Series lies disconformably under the lower Permian Chihsia limestone,and is mainly of thin-bedded and argillaceous limestone intercalated with shale layers fossils such as,Yunnanella synplicata Grabau,bryoson and pelesy etc.are found,indicating a late upper Devonian age.The Hsiehkingssu Series,as a whole,may be correlated with Hsikuangshan Series in central Hunan.As well known to the Chinese geologists the Ninghsiang-type iron ore bearing strata widely spread in South China.The iron-oolitic bed of the Huangiadang Series formerly considered to be of the lower Carboniferous age,is hereby with its marine Devonian fossils belived to belong to the Ninghsiang iron bearing strata of upper Devonian.
作者
敖振宽
杨昌权
NGO ZHEN-KUAN;YANG CHANG-CH'UEN
出处
《地质学报》
1959年第1期94-102,共9页
Acta Geologica Sinica
