黔北务正道地区及邻区石炭纪-二叠纪之交海平面变化对铝土矿的控制  

Control of Sea-level Changes over the Forming of Bauxite between Carboniferous and Permian in Northern Guizhou and Adjacent Regions

作　　者：黄兴[1] 张雄华[1] 杜远生[1] 郄文昆[2] 杨兵[1] 段先锋[1] 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国科学院南京地质古生物研究所,南京210008

出　　处：《地质科技情报》2013年第1期80-86,共7页Geological Science and Technology Information

基　　金：贵州省地勘基金项目"黔北务正道地区铝土矿基础地质和成矿规律研究"

摘　　要：晚石炭世至早二叠世,受全球成冰事件的影响,华南海平面变化频繁。其中,达拉期至小独山期海侵规模最大,导致碳酸盐岩普遍发育,为研究区铝土矿的沉积提供了空间上的保障;而紫松期至隆林期,本区出现最大规模的海退,很多地区的碳酸盐岩沉积减薄,甚至暴露,遭受风化剥蚀,在黔北地区表现尤为明显,长时间的沉积间断有利于该区红土化和铝土矿化的进行。讨论了晚石炭世至早二叠世华南地区海平面变化规律,简要分析了这段特殊时期贵州北部及其邻近地区古地理格局的变化,结合古气候资料,认为黔北铝土矿形成于华南地区晚石炭世至早二叠世海退规模最大的时期,即早二叠世紫松期至隆林期。Sea-level fluctuated frequently in South China during the late Carboniferous to early Permian, which was constrained by the glaciations. The stage of Dalaun stage to Xiaodushanian stage witnessed the maximum sea transgression, during which the carbonate widely developed. The maximum regression dur- ing Zisongian stage to Longlinian stage resulted in the thinning carbonate sedimentary. What＇s more, weathering denudation occurs especially in the northern Guizhou Province. This long time of depositional hiatus is propitious to the forming of the bauxite. On the basis of the data of sea-level changes in South China, paleogeographic changes and paleoclimate, it is inferred that the forming age of bauxite distributing in northern Guizhou is from Zisongian stage to Longlinian stage, during which the South China experienced the maximum regression.

关 键 词：海平面变化 铝土矿 成矿时代 黔北 

分 类 号：P618.45[天文地球—矿床学]