滇东镇雄地区梁山组岩石组合与基本层序  

THE LITHOLOGIC ASSEMBLAGE AND BASIC STRATIGRAPHIC SEQUENCE OF LIANGSHAN FORMATION IN ZHENXIONG AREA,E YUNNAN

作　　者：杨成忠 吕俊 YANG Cheng-zhong;LU Jun(International Mining Company(Ltd),Yunnan Geology&Mineral Resources,Kunming 650051)

机构地区：[1]云南地矿国际矿业股份有限公司,云南昆明650051

出　　处：《云南地质》2020年第3期343-348,共6页Yunnan Geology

基　　金：云南1∶5万五德、芒部、镇雄县、周骥站4幅区域地质调查。(编码:121201010000150002-10)。

摘　　要：通过1∶5万区域地质填图,滇东北镇雄地区的下二叠统梁山组(P1l)整体显示为一套灰色含煤陆源粗碎屑沉积.其主体部分基本层序为灰、深灰色石英岩(A)→灰绿色泥岩(B),基本层序厚2.90m^5.90m,重复出现3~4次,形成于潮上—潮间带;次要部分的基本层序由灰绿色泥(页)岩或粉砂岩与灰黑、深黑色煤层组成韵律性基本层序,基本层序厚约1m,重复出现4~7次,形成于沼泽环境.According to the 1∶50000 regional geological mapping,Lower P Liangshan Formation(P1l) in Zhenxiong area,NE Yunnan generally shows a suite of the grey coal-bearing terrigenous coarse clastic deposit.The basic sequence of main part is grey,dark grey quartzite(A)→grey-green mudstone(B),basic sequence thickness 2.90 m-5.90 m,repeat 3-4 times,formed in over-tidal,tidal zone;the basic sequence of secondary part is cyclothemic,formed by the grey-green mudstone(shale) or siltstone and grey-black coal bed,basic sequence thickness 1 m,repeat 4-7 times,formed in the marsh environment.

关 键 词：梁山组 岩石组合 基本层序 云南镇雄 

分 类 号：P534[天文地球—古生物学与地层学]