摘要： 通过野外地质调查、手标本观察、底板地层分布和矿体—含矿层厚度分析,对黔北务正道(务川—正安—道真)地区铝土矿沉积古地理及其与铝土矿成矿之间的关系进行了研究。结果表明:(1)铝土矿沉积盆地北以武隆为界,西北至南川,东至沿河,南至绥阳—凤冈一线;(2)研究区古地貌具南高北低的特点,沉积相带可分为海湾中心和滨岸湿地两部分,优质的铝土矿区均位于滨岸湿地;(3)沉积古地理决定了含矿层的厚度,但并不直接控制高品位铝土矿的形成,只有在其余成矿条件都适合的情况下,古地理通过控制铝土矿的沉积环境间接控制高品位铝土矿的形成。
关键词:
早二叠世,
铝土矿,
古地理,
控矿意义,
务正道地区,
贵州省
Abstract: Based on field geology,hand specimens,distribution characteristics of underlying strata,and thickness of orebody and ore beds,we conducted a comprehensive analysis on the palaeogeography and its relationship with the mineralization process of bauxite in Wuchuan-Zheng′an-Daozhen area, northern Guizhou Province. The results showed that:(1)The sedimentary basin of bauxite is bounded by Wulong area on the north, by Nanchuan area on the northwest, by Yanhe area on the east,and by Suiyang-Fenggang area on the south; (2)The south part of the basin had a higher ancient landform than the north,and the sedimentary environment of bauxite was composed by partly closed bay and shoreland glade,and the good-quality bauxite was almost in the shoreland glade;(3)Sedimentary palaeogeography controlled the thickness of ore beds but not directly controlled the forming of high-grade bauxite.Sedimentary palaeogeography indirectly controlled the forming of high-grade bauxite by controlling sedimentary environment of bauxite when other factors were beneficial.
Key words:
Early Permian,
bauxite,
palaeogeography,
mineralization significance,
Wuchuan-Zheng′an-Daozhen area,
Guizhou Province
中图分类号:
崔滔, 焦养泉, 杜远生, 汪小妹, 雷志远, 翁申富, 金中国. 黔北务正道地区早二叠世铝土矿沉积古地理及其控矿意义*[J]. 古地理学报, 2014, 16(1): 9-18.
Cui Tao, Jiao Yangquan, Du Yuansheng, Wang Xiaomei, Lei Zhiyuan, Weng Shenfu, Jin Zhongguo. Sedimentary palaeogeography and its mineralization significance of the Early Permian bauxite in Wuchuan-Zheng′an-Daozhen area,northern Guizhou Province[J]. JOPC, 2014, 16(1): 9-18.