Abstract：Soil radon measurement technology is an effective means for geothermal exploration, and its purpose is to determine the buried faults and the geothermal fluid accumulation area. 1 904 groups of data were collected through measuring soil radon in the study area and by means of point-network control and profile-linear tracing. According to the sources of different loose layers, the authors analyzed the data using the partition and piecewise methods, and discovered significant difference in soil radon in different layers. The soil radon background value is 392.1 Bq/m3 in the metamorphic clastic accumulation, 1 930.2 Bq/m3 in the granite debris, and 1 571.1 Bq/m3 in the syenite and granite melange. The dispersion degree of the data was calculated and the anomaly threshold was determined. And on such a basis, the characteristics of soil radon distribution were analyzed. It is shown that the high value anomaly of soil radon can better indicate the locations of buried faults and geothermal anomalous zones.
[1] 刘春来,庹先国,黄连美,等.地下氡气测量推测隐伏断层走向[J]. 物探与化探,2011,35(2):226-229. [2] 刘菁华,王祝文,王晓丽,等.氡气测量在佳木斯城市地下热水普查的应用[J]. 地球科学与环境学报,2009,31(1):75-78. [3] 刘汉彬,尹金双,崔勇辉.土壤氡气测量在鄂尔多斯盆地西缘砂岩型铀矿勘查中的应用[J].铀矿地质,2006,22(2):115-120. [4] 张慧.兰州市土壤逸出气体地球化学特征与断层活动性关系研究.北京:中国科学院研究生院,2007. [5] Ioannides K, Papachristodoulou C, Stamoulis K, et al. Soil gas radon: a tool for exploring active fault zones[J]. Applied Radiation and Isotopes, 2003,59:205-213. [6] Al-Tamimi M H, Abumurad K M. Radon anomalies along faults in North of Jordan[J]. Radiation Measurements, 2001, 34:397-400. [7] 陈峰,齐万秋,闫峰,等.新疆维吾尔自治区地热资源调查与评价.乌鲁木齐:新疆维吾尔自治区地质矿产开发局,2012. [8] Robinson A C, Yin A, Manning C E, et al. Tectonic evolution of northeastern Pamier: Constraints from the northern portion of the Cenozoic Kongur Shan extensional system, western China[J]. Geological Society of America Bulletin, 2004, 116:953-973. [9] 沈军,汪一鹏,赵瑞斌,等.帕米尔东北缘及塔里木盆地西北部弧形构造的扩展特征[J].地震地质,2001,23(3):381-389. [10] 陈杰,李涛,李文巧,等.帕米尔构造结及邻区的晚新生代构造与现今变形[J].地震地质,2011,33(2):241-259. [11] 罗照华,莫宣学,柯珊. 塔什库尔干碱性杂岩体形成时代及其地质意义[J]. 新疆地质,2003,21(1):46-50. [12] 柯珊,罗照华,莫宣学.帕米尔构造结塔什库尔干碱性杂岩同位素年代学研究[J]. 岩石学报,2008,24(2):315-324. [13] 程冠,程建平,郭秋菊.土壤氡析出率影响因素及估算模型[J].中华放射医学与防护杂志,2006,26(5):520-524. [14] Abumurad K M, Al-Tamimi M. Emanation power of radon and its concentration in soil and rocks[J]. Radiation Measurements,2001, (34) :423-426. [15] Ball T K, Cameron D G, Colman T B. Behaviour of radon in the geological environment: a review[J]. Quarterly Journal of Engineering Geology,1991,24:169-182.
