摘要
通过对黔北务正道地区铝土矿矿石的结构特征、空间分布、古地理资料综合研究认为:不同自然类型的铝土矿指示不同的沉积环境,致密状与半土状铝土矿的沉积过程与黏土岩类似,形成于半封闭海湾的低能环境,碎屑状与豆鲕状铝土矿形成于相对高能的滨岸湿地环境。铝土矿的空间分布与粒级有关,碎屑状与豆鲕状铝土矿围绕半封闭海湾分布,在南部新模向斜、张家院向斜、安厂向斜一线占较大优势。致密状铝土矿在全区广泛分布,由南向西北方向,致密状与半土状铝土矿所占比重皆增加。铝土矿沉积后,受到淋滤作用影响,促使矿石品质变好。
Through the research of structure of the bauxite, distribution of different types bauxite and ref- erence paleogeography data, we considered that different natural types of the bauxite showed different en- vironment. Massive and half-earthy bauxite indicated low energy environment. Clastic and oolitic bauxite indicated the high energy environment of shoreland. The distribution of the bauxite was influenced by grain size grade. Clastic and oolitic bauxite around the study area were dominant in Xinmo, Zhangiiayuan and Anchang synclines. Massive bauxite was widely distributed in the study area. Massive and half-earthy bauxite gradually increased from south to north. The bauxite was formed in a lake or a partly closed bay which was influenced by the frequently transgression and regression, and sea water access the study area from north to south. Eluviation after bauxite deposit improved the grade of the bauxite ores.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第1期52-56,共5页
Geological Science and Technology Information
基金
贵州省地勘基金项目“贵州务正道地区铝土矿基础地质与成矿规律研究”
关键词
务正道地区
铝土矿
结构特征
空间分布规律
Wuchuan-Zheng an-Daozhen area
bauxite
structure characteristic
distribution characteristics
