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| GEOCHEMICAL CHARACTERISTICS AND ECONOMIC SIGNIFICANCE OF THE Se-RICH SOIL IN CHONGQING |
| YAN Ming-shu1,2, GONG Yuan-yuan1, YANG Le-chao1, ZHOU Jiao1, ZHANG Mao-zhong1, BAO Li-ran1 |
1. Southeast Sichuan Geological Group, Chongqing Bureau of Geology and Mineral Exploration, Chongqing 400038, China;
2. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China |
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Abstract Geochemical characteristics and content of selenium (Se) in the topsoil of Chonqing City were investigated on the basis of measuring the topsoil in Chongqing obtained from gridding and section sampling. The content of Se in the topsoils of Chonqing City is (0.005~5.790)×10-6, and the background level is 0.197×10-6. The distribution of Se is controlled by the strata, the lithology of the mother rock, the types of the soil, the horizon of the soil and the controlling capability of the soil for enriching the Se. The Se-rich soil is distributed mainly in the Triassic, Permian, Devonian, Silurian, Ordovician and Cambrian calcareous soil. According to the standard that the Se-rich soil should have the Se content of (0.4~3.0)×10-6, a total area of 3 684 km2 of Se-rich soil was discovered, which is distributed mainly in the south of Qiqiang-Wansheng-Nanchuan district, with a small amount distributed in places near the Chongqing main city, like Tianfu, Huaxi and Sanhui. It is inferred that there also exists over 10 000 km2 of Se-rich soil in Wulong-Youyang-Xiushan and Chengkou-Wushan areas. The Se-rich soil is favorable for enriching the Se in the primary product, because of the pH and the organic matter in the Se-rich environment. It has been proved that the primary products are green primary products in Beibei Se-rich soil area. The Se-rich soil in Chongqing has good economic significance.
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Received: 26 February 2013
Published: 10 April 2014
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