The Sedimentary Characteristics And Metallogenic Regularity Of Potash Mine In Tagong Mine In Vientiane Basin Laos

In order to carry out the national "China Belt and Road Initiative" strategy,Enterprises going out of china,Looking for potash fertilizer production base abroad,Make up the gap of potash resources in china,Providing food security for our country.No.203 Research Institute of Nuclear Industry and Asia potash minerals Investment Limited(laos)Signed a potash mine Tagong plug was joint exploration of Vientiane city county area.Vientiane basin is located in the East Indian plate of the South China East Indosinian plate,Is part of the Khor-at basin.The Khor-at basin lies in the northeast of Thailand and the central part of laos,It is an important potash ore distribution area in the world.The Phu Phan uplift divides the Khor-at basin into two secondary basins,The north is the Sakon Nakhon basin and the south is the Khor-at basin.Potash mine exploration work is low in laos,Little basic data,The sedimentary characteristics and metallogenic regularities of potash deposits are less studied.This study is in the specific work by Tagong Vientiane basin mining potash mine survey-Survey-exploration,At the same time,the geological and geophysical data of nearby ore deposits are collected,Combined with the means of work,geological logging,well logging,chemical sample analysis and testing,microscopic identification,etc.,According to the analysis and test results,combined with seawater concentration sequence of salt precipitation,The ore minerals are calculated and divided into two natural sedimentary types by cluster analysis and pedigree method,The sedimentary characteristics of potash deposits in mining area are comparatively systematic.Comprehensive arrangement and analysis of data,Combining the results of exploration work,The metallogenic regularities are summarized and the following conclusions are obtained:(1)Are two different sedimentary series Sylvite and Carnallitite:I-sylvite,halite,gypsum sedimentary series;II-tachydrite,bischofite,Carnallitite sedimentary series,Different precipitation stages indicate that the two sedimentary series represent the solution,The first crystallization of sylvite,carnallite and trace elements,Br with the increase of brine concentration occurs in carnallite,the content of Br is higher than that of sylvite carnallite.(2)Obviously affected by stratabound,sylvite mine,The Paleogene Tagong formation for ore bearing strata,The potash mineral salt rock on top of the main ore produced in Tagong formation rock salt rock on top,or layered output.(3)Belong to the continental sedimentary Tagong Haiyuan mine in Vientiane basin,At the beginning of the whole basin,there were potassium salt deposits in the Vientiane basin,and the potash ore bodies were mostly gentle ore beds,Because of the change of the local paleo landform,the brine migration or the plastic flow of potassium salt mine,The migration of gypsum salt to the stress weak zone in the core of the salt anticline leads to the thin core of the salt syncline and the thickening of the core of the "salt anticline".The erosion of the core of the "salt anticline" resulted in thinning or absence of the potash ore.