摘要
河南省是我国第二产铝大省,而铝土矿所在地层层位石炭系本溪组划分长期以来争议不定。本文通过对河南本溪组地层层位的岩性组合、动植物化石组合及其孢粉组合等特征进行了较系统的分析对比,得出以下几点认识:(1)豫北鹤壁本溪组是一个跨滑石板阶和达拉阶的岩石地层单位;(2)河南省焦作本溪组上界应与达拉阶上界大致接近;(3)豫西地区本溪组应属于跨滑石板阶、达拉阶及马平阶三个不同时代的岩石地层单位;(4)嵩箕北区本溪组生物群属晚石炭世之产物;(5)嵩箕中区本溪组生物群更比嵩箕北区的年代晚。综上所述,河南铝土矿所在地层-本溪组含铝岩系为一"穿时"性清楚且典型的岩石地层单位,如果以目前石炭世的划分方法,河南省本溪组既有晚石炭世早期,亦有晚石炭世中期,是一个同相异期的岩石地层组合。
Henan Province is the second largest aluminum-producing province in China, where the bauxite occurs in the Carboniferous Benxi Formation. However, stratigraphic division of the Benxi Formation remains controversial for a long time. This paper presents a comprehensive analysis about lithological association, zoolite and plant fossil assemblage and sporo-pollen assemblage.. The conclusions are as follows. （ 1 ） The Benxi Formation in He- bi of North Henan Province is a lithostratigraphic unit that spans across the Huashiban stage and Dalat stage. （2） The upper limit of the Benxi Formation in Jiaozuo City is near the upper limit of the Dala stage. （ 3 ） The Benxi Formation in West Henan Province is a lithstratigraphic unit cutting across the Hua- shiban stage, Dalat stage and Maping stage. （4） The biological group in the Benxi Formation of the North Songqi area is the product of the late Carboniferous epoch. （5） The biological group in the Benxi Formation of the central Songqi area is later than that in the north Songqi area. To sum up, the aluminiferous Benxi Formation in Henan Province is an obviously diachronous and typical litbostratigraphic unit. According to the current subdivision method of Carboniferous epoch, it formed both in the early and middle stage of the late Carboniferous. It is a litbostratigraphie assembly with homophase but different periods.
出处
《地质与勘探》
CAS
CSCD
北大核心
2012年第1期49-57,共9页
Geology and Exploration
关键词
铝土矿
本溪组
化石组合
孢粉组合
地层单位
成矿时代
河南省
bauxite, Benxi Formation, fossil association, sporo-pollen association, stratigraphic unit, metallogenetic epoch, Henan Province
