黔北地区志留系石牛栏组沉积体系划分及古地理演化  

Sedimentary System Division and Paleogeographic Evolution of the Early Silurian Shiniulan Formation,Northern Guizhou

作　　者：安亚运 盘应娟 杨忠琴 AN Ya-yun;PAN Ying-juan;YANG Zhong-qin(Guizhou Geological Survey,Guiyang 550081,Guizhou,China)

机构地区：[1]贵州省地质调查院,贵州贵阳550081

出　　处：《贵州地质》2024年第2期137-145,共9页Guizhou Geology

基　　金：黔北地区石牛栏组岩相古地理与页岩气有利储集相带研究(编号:黔地矿科合[2019]24)资助。

摘　　要：黔北地区志留系下统石牛栏组发育完整,研究薄弱,为进一步探讨该组岩相古地理及演化,通过剖面实测与岩相分析,结合区域地质资料综合研究表明,该组发育海相沉积和过度相沉积,包括潮坪、碳酸盐台地、陆棚及三角洲相类型,朝上坪、局限台地、开阔台地、台地边缘礁(滩)、泥质陆棚和混积陆棚、三角洲前缘亚相类型,生物礁、生物滩、颗粒滩、砂坝、生物丘微相类型,道真以南发育海相沉积,以北发育三角洲前缘;垂向上分4个段2个旋回,一、三段由钙泥质岩、泥灰岩、粉砂岩组成,二、四段由生物碎屑灰岩、藻砂屑灰岩组成,一、二段组成第一旋回,三、四段组成第二旋回,在古陆隆升、盆地伸展等机制作用下,记录了一个有序的海侵-海退地层序列。The Lower Silurian Shiniulan formation in northern Guizhou is well developed,but the research of this area is weak,in order to further explore the paleogeography and evolution of the lithofacies of this formation,through profile measurement and lithofacies analysis,combined with the comprehensive study of regional geological data,it is shown that the marine sediments and hyperfacies sediments are developed in this formation,including tidal flats,carbonate terraces,shelfies and delta facies types,upward flat,confined platform,open platform,platform marginal reef(beach),argillaceous shelf and mixed shelf,delta front subfacies type,microfacies types of bioreefs,bioshoals,granular shoals,sand bars,and biomounds,marine sedimentation developed south of Daozhen,to the north develops delta front,vertically divided into 4 segments and 2 cycles,the first and third members are composed of calcareous argillaceous rock,marl,and siltstone,the second and fourth members are composed of bioclastic limestone and algal sand-detrisulous limestone,the first and second stages form the first cycle,the third and fourth segments form the second cycle,under the action of paleocontinental uplift and basin extension,an orderly transverse-retreat stratigraphic sequence was recorded.

关 键 词：黔北地区 志留系 石牛栏组 沉积体系 岩相古地理 

分 类 号：P534.43[天文地球—古生物学与地层学] P92[天文地球—地质学] P531