Interaction between karst terrain and bauxites: evidence from Quaternary orebody distribution in Guangxi, SW China.
Interaction between karst terrain and bauxites: evidence from Quaternary orebody distribution in Guangxi, SW China.
复制标题
DOI：
10.1038/s41598-017-12181-1
复制
发表时间：
2017-09-19
影响因子：
4.6
通讯作者：
Deng J
中科院分区：
文献类型：
--
作者：
Yang L;Wang Q;Zhang Q;Carranza EJM;Liu H;Liu X;Deng J
我国铝土矿大多位于岩溶地表，但岩溶作用与铝土矿形成的关系尚不清楚。本文通过对桂西地区9,007口威尔斯探井434个矿体的矿体参数分布特征的分析，探讨了这种关系对岩溶与铝土矿演化的影响。在以山峰为主的高海拔岩溶区，矿体平均厚度大于以洼地为主的低海拔区，Al 2 O3含量低，Fe 2 O3含量高。主成分分析和多重分形分析表明，Al_2O_3、Fe_2O_3、LOI和矿体厚度在高海拔地区分布较均匀，且由凹陷几何形状决定。这说明在高海拔地区，铝土矿次生风化过程中释放H+的含铁粘土矿物与岩溶地表氧化碱性水之间的相互作用比低海拔地区更为强烈。与自组织性质的相互作用被认为是高海拔地区岩溶洼地和铝土矿矿体厚度均匀发育的原因。相比之下，SiO2分布在低海拔地区更均匀，潜水带附近的连通洼地促进了SiO2的活化和均匀分布。
Most bauxite in China is located upon the karst surface, yet the relation between karstification process and bauxite formation is barely known. Here we discuss how the relation affects the karst and bauxite evolution through analyzing distributions of orebody parameters from 9,007 exploration wells (434 orebodies) in western Guangxi, South China block. In high-elevation karst terrain dominated by peaks, orebodies have greater average thickness, lower Al2O3 and higher Fe2O3 T than those in low-elevation region dominated by depressions. Principal component and multifractal analyses show that the Al2O3, Fe2O3 T and LOI and the orebody thickness, determined by depression geometry, have more even distributions in high-elevation terrain. This explains that the interaction between the oxidized, alkaline water in karst surface and the ferrous clay minerals that released H+ during bauxite secondary weathering was more intensive in high-elevation terrain than in low-elevation one. The interaction with self-organized nature is considered responsible for the even development of karstic depressions and bauxite orebody thicknesses in high-elevation terrain. In comparison, SiO2 distribution is more even in low-elevation terrain, where connected depressions near the phreatic zone facilitated SiO2 mobilization and even distribution.
登录
查看更多内容
影响因子：
3.9
作者：
Bautista, Francisco;Palacio-Aponte, Gerardo;Zinck, Joseph Alfred
通讯作者：
Zinck, Joseph Alfred
影响因子：
5
作者：
Brandt, F;Bosbach, D;Bernhard, G
通讯作者：
Bernhard, G
影响因子：
4.4
作者：
Laskou, M;Margomenou-Leonidopoulou, G;Balek, V
通讯作者：
Balek, V
影响因子：
2.9
作者：
ORTOLEVA, P;MERINO, E;CHADAM, J
通讯作者：
CHADAM, J
DOI：
10.1144/1470-9236/2002-33
发表时间：
2003-05-01
影响因子：
1.4
作者：
Waltham, AC;Fookes, PG
通讯作者：
Fookes, PG