| 罗布泊盐湖钾盐矿床分布规律及控制因素分析 |
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| 关键词:Lop Nur salt lake potash deposits distribution models |
| 基金项目:国家自然科学基金重点项目(编号40830420) |
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| 摘要: |
| The Probing of Regularity and Controlling Factors of Potash Deposits Distribution in Lop Nur Salt Lake, Xinjiang |
| Lop Nur Salt Lake is located in the eastern part of Tarim Basin,Xinjiang in northwest of China, and is one of the largest playas in the World during Quaternary period. Since middle Pleistocene epoch, being influenced by neotectonic activities, the most parts of the northern of Lop Nur Lake had started to rise, and the mean while the graben-faults and hollows occurred in some parts of the northern area. The investigations show the hollows and faulting belts hold potash deposits, most being brine potash deposits. These potash deposits are distributed ac-cording to some oriental and iso-distance interval. The distribution pattern of potash deposits may be called “sat-ellite type”, for that Luobei hollow potash deposit is the largest one, and there are some small ones which are dis-tributed around it. In the graben-faulting belts brine commonly occur vertically and horizontally, this is called “water-bearing wall” model. The potash-mineral depositing areas are in the inner of hollows and faulting belts, their shapes and trends are controlled by the graben-faults. The solid potash deposition may be divided into two kinds of models, one is the “evaporaing and concentrating type” in that the area of potash minerals distribution occupies quarter of the hollow in area, and the other is “tectonic hollow type” in that the potash may nearly occupy the whole late tectonic-hollow area. The shapes of the potash-mineral depositing areas are usually strip, or called “ore strip” model, the ratios of length vs. width are basically stable, averagely 3.58. Except for the tectonic stress, the shape and area of Lop Nur Lake and river-supplying directions also play an important effect on the distribution of potash deposits. Understanding of the regularity and controlling factors of potash deposits distribution is sig-nificant for exploring of the solid potash deposits buried in ancient strata. |
| LIU Cheng-lin,WANG Mi-li,JIAO Peng-cheng,CHEN Yong-zhi.2009.The Probing of Regularity and Controlling Factors of Potash Deposits Distribution in Lop Nur Salt Lake, Xinjiang[J].Acta Geoscientica Sinica,30(6):796-802. |
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