| 陕北奥陶纪盐盆厚层钾石盐高矿化段的发现及其找钾启示 |
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| 关键词:sylvite Ordovician Majiagou Formation salt rhythm northern Shaanxi salt basin the second east salt depression |
| 基金项目:中国地质调查局地质调查工作项目“陕北奥陶纪盐盆地钾盐资源调查评价”(编号: 1212011085516);国家重大基础研究计划“973”课题“鄂尔多斯奥陶纪古陆表海盆成钾条件、机理和后期演化”(编号: 2011CB403001) |
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| The Discovery of Thick-bedded Sylvite Highly Mineralized Section from the M56 Sub-member of Ordovician Majiagou Formation in Northern Shaanxi Salt Basin and Its Potash Salt-prospecting Implications |
| Located on the east side of the Suide salt depression in Northern Shaanxi salt basin, the scientific potash prospecting well of SJ1 encountered 118.17 m of the M56 member of the Ordovician Majiagou Formation. The cumulative thickness of the salt series in the member is 100.38 m. In this study, the M56 member of well SJ1 was divided into 4 salt rhythms, and the potassium content in the salinastone section was evaluated by in-situ micro-chemical reaction testing and quantitative analysis in the laboratory. The data obtained indicate that the cumulative thickness of mineralized potash in the M56 member is 64.7 m, comprising 3 salt rhythms. Potash salt monolayer is brownish red or brown in color in the relatively complete rhythm II and rhythm III, and potash salt in rhythm II has the highest content of potassium, with the argillaceous interlayer at the top playing the protective role. The potassium content for part of the section is close to industrial grade, with potassium ion content ranging from 0.08% to 1.24%, mostly in excess of 0.1% and averagely 0.23%. The Br- content is from 90×10-6 to 400×10-6, averaging 242×10-6; the Br-×103/Cl- ratio ranges from 0.17 to 0.98, averaging 0.45. The content of Br- and the Br-×103/Cl- ratio indicate that most of the samples have reached the precipitation stage for potash and carnallite. Using the average K+ (%) content values for well SJ1 and the other eight boreholes in the salt depression, the authors drew a trend map for the change in the K+ (%) content, which shows that the better potash depression is the second east salt depression. The discovery of the thick highly mineralized sylvite layer in the well not only supports the potential for potash prospecting in the area but also provides clear indications for the exploration of potash salt. |
| ZHANG Yong-sheng,XING En-yuan,ZHENG Mian-ping,SU Kui,FAN Fu,GONG Wen-qiang,YUAN He-ran,LIU Jian-hua.2014.The Discovery of Thick-bedded Sylvite Highly Mineralized Section from the M56 Sub-member of Ordovician Majiagou Formation in Northern Shaanxi Salt Basin and Its Potash Salt-prospecting Implications[J].Acta Geoscientica Sinica,35(6):693-702. |
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