贵州后槽铝土矿古岩溶地貌控矿作用及找矿意义  

Significance of paleo-karst geomorphology control on ore in Houcao bauxite mine in Guizhou province

作　　者：刘旭[1] 姬胜源 翁申富[1] 赵爽[1] LIU Xu;JI Shengyuan;WENG Shenfu;ZHAO Shuang(Geological Party 106 , Guizhou Bureau of Geology and Mineral Exploration and Development, Zunyi 563000, Guizhou, China;Guizhou Research Institute of Petroleum Exploration & Development, Guiyang 550004, China)

机构地区：[1]贵州省地质矿产勘查开发局106地质大队,贵州遵义563000 [2]贵州省油气勘查开发工程研究院,贵阳550081

出　　处：《地质找矿论丛》2022年第1期27-37,共11页Contributions to Geology and Mineral Resources Research

基　　金：贵州省地矿局科研项目(编号:黔地矿科合〔2015〕04号)资助。

摘　　要：后槽铝土矿区位于黔中遵义铝土矿带中部,受NE向岩溶盆地控制,发育众多形态各异的中、小型的溶洼、溶坑和溶沟,在这些溶蚀洼地中,沉积了下石炭统九架炉组含铝岩系。文章通过对后槽地区354个钻探工程揭露的含铝岩系厚度、矿体厚度及化学成分的系统统计分析,研究了该区岩溶古地貌特征及其控矿作用,并进行找矿靶区预测。研究结果表明,后槽地区含铝岩系严格受古侵蚀面制约,岩溶古地貌直接控制含铝岩系的产出和厚度。在古岩溶凹陷中含铝岩系较厚,铝土矿层厚度也大,w(Al_(2)O_(3))值越高;在地形凸起的部位,含铝岩系地层厚度变薄,基本无铝土矿产出;在古地貌整体平缓、古溶蚀作用不强烈的区域,含铝岩系的厚度比较稳定,产出形态单一,铝土矿层以层状、似层状产出。在沙坝和后槽以南地区含铝岩系较厚,岩溶古地貌特征明显,值得进一步开展找矿勘探。Houcao bauxite mine is located at the central part of Zunyi bauxite ore belt in the central Guizhou province.The mining area is controlled by a karst basin.Here are developed various morphological karst features,such as medium-small karst depression,pit and gully.In the depressions is deposited the Al-bearing rock sequence of Jiujialu formation of Lower Carboniferous Series.354 drill holes were operated in Houcao area to control thickness of the Al-bearing sequence.Statistics of of the thickness and chemical composition of the rock were made to study the paleo-karst morphology control on the bauxite ore.Based on the control prospecting targets are predicted.The Al-bearing sequence is strictly controlled by paleo-erosion surface and occurrence and thickness of the Al-bearing sequence directly by the paleo-karst morphology.In the paleo-karst depression the Al-bearing sequence is relatively thick and w(Al_(2)O_(3))higher.At the convex the sequence gets thinner and no bauxite ore occur.At the gentle relief without paleo-karst erosion the sequence is stable in thickness and single occurrences.The bauxite ore looks layered or layeroid.In areas in south of Saba and Houcao village distinct paleo-karst morphology occur and the Al-bearing sequence thicker thus worth prospecting.

关 键 词：后槽铝土矿 含铝岩系 古岩溶地貌 控矿作用 贵州省 

分 类 号：P618.45[天文地球—矿床学] P613[天文地球—地质学]