文献类型：期刊文献

中文题名：黔中开阳地区早石炭世大塘期岩相古地理对铝土矿成矿的制约

英文题名：Constraints of the Early Carboniferous Datangian lithofacies paleogeography on the bauxite mineralization in the Kaiyang area,central Guizhou,China

作者：吕留彦 陈仁 于宁 田茂军 乔卫涛 胡歆睿 岳龙 周武

第一作者：吕留彦

机构：[1]贵州省地质调查院,贵州贵阳550081;[2]贵州理工学院资源与环境工程学院,贵州贵阳550003;[3]中南大学地球科学与信息物理学院,湖南长沙410083

第一机构：贵州省地质调查院,贵州贵阳550081

年份：2021

卷号：41

期号：4

起止页码：509-519

中文期刊名：矿物学报

外文期刊名：Acta Mineralogica Sinica

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：中国地质调查局地质调查项目(编号:12120114072501);中国地质科学院地质研究所项目(编号:DD20190370-34)。

语种：中文

中文关键词：黔中开阳;早石炭世;铝土矿;岩相古地理;地球化学

外文关键词：Kaiyang area in the central Guizhou;Early Carboniferous;bauxite;lithofacies paleogeography;geochemistry

摘要：黔中开阳地区位于古隆起区,古地势较高,碳酸盐岩基底为早石炭世九架炉组含铝岩系提供了物质来源,古喀斯特洼地为其提供了沉积空间。为查明黔中早石炭世铝土矿成矿带上开阳一瓮安一带无中、大型铝土矿的原因,在区域地质矿产调查的基础上,针对石炭系九架炉组开展探槽和剖面测量,并进行地球化学分析。地球化学分析显示,含铝岩系样品的Sr/Ba值0.22~0.55,平均为0.33,Sr/Cu值下部较小为2.27~5.85,中上部较大为24.78~67.74,Th/U在2.99~4.97至间,平均为3.9,V/(V+Ni)值为0.85~0.99,显示开阳地区大塘期候炎热干燥的古气,含铝岩系形成于还原的陆相沉积环境中且风化不彻底成分复杂。研究表明,黔中开阳地区古喀斯特地貌控制了含铝岩系的发育程度、规模和沉积环境,同时早石炭世封闭、还原的湖泊沉积环境及炎热干燥的古气候条件制约了铝土矿的矿化、富集及矿床的形成。
The Kaiyang area in the Central Guizhou is located in the paleo-uplift area with relatively high paleotopography.The carbonate basement provided the materials and the paleokarst depression provided sedimentary space for the bauxite-bearing rocks series of Early Carboniferous Jiujialu Formation,.In order to find out the reason why there is no medium-sized and large-sized bauxite deposits in the Kaiyang-Weng’an area in the Central Guizhou Early Carboniferous bauxite metallogenic belt,The authors operated surveys of exploratory trenches and sections of the Carboniferous Jiujialu Formation and fetched samples to do the geochemical analysis based on the investigation of regional geology and mineral resources.The geochemical analyses show that samples of the section of bauxite-bearing rocks series have Sr/Ba values of 0.22-0.55 with the average of 0.33,t Sr/Cu values of 2.27-5.85 in the lower part and 24.78-67.74 in the middle and upper parts of the section,Th/U values of 2.99-4.97 with the average of 3.9,and V/(V+Ni)values of 0.85-0.99.These show that the paleoclimate of Datang period in the Kaiyang area was hot and dry,the bauxite-bearing rock series were formed in the reduced continental sedimentary environment by the uncompletely weathered materials with complicated components.It is believed that the paleokarst landform of carbonate rocks in the Kaiyang area controlled the development degree,size and depositional environment of the bauxite-bearing rock series.Meanwhile,the Early Carboniferous closed and reduced lake sedimentary environment and hot and dry paleoclimate conditions in the Kaiyang area restricted the mineralization,enrichment and formation of bauxite deposits.