| 重力场特征与砂岩型铀矿的关系及地质意义 |
| |
| 引用本文： | 封志兵,聂逢君,江丽,曾建刚,严兆彬,李红星. 重力场特征与砂岩型铀矿的关系及地质意义[J]. 现代地质, 2014, 28(4): 841-849 |
| |
| 作者姓名： | 封志兵 聂逢君 江丽 曾建刚 严兆彬 李红星 |
| |
| 作者单位： | (1.东华理工大学 核资源与环境国家重点实验室培育基地，江西 南昌330013；2.东华理工大学 核工程与地球物理学院，江西 南昌330013；3.中国地质大学(北京)地球物理与信息技术学院，北京100083) |
| |
| 基金项目： | 国家自然科学基金项目(40972067);江西省研究生创新专项资金项目(YC2012-S085) |
| |
| 摘 要： | 重力场变化特征能够较好地反映地下地质体信息，砂岩型铀矿分布特征与重力场具有一定联系。我国砂岩型铀矿主要分布在我国布格重力异常场中-西北部区，且砂岩型铀矿床大多位于重力场由高向低变化的梯度带上，但靠近重力场高值区。结合砂岩型铀矿成矿机理，分析中-西北部区主要含铀盆地构造演化、地层结构等特征，认为位于中-西北部区的含铀盆地所经历的“次造山运动”及其后期相对稳定的构造环境有利于砂岩型铀矿成矿。斜坡的适度抬升有利于富铀岩体风化剥蚀，含铀含氧流体运移、断裂等因素控制砂岩型铀矿成矿，斜坡处地形改变形成重力场变化梯度带，地下断裂、岩石组分变化使重力等值线产生同形扭曲或错断现象。因此，重力场变化特征对划定砂岩型铀矿勘探靶区具有一定的借鉴作用，并以松辽盆地西南部钱家店铀矿床为例，探讨其成矿条件与重力场变化特征的关系，体现其实际应用性。
|
| 关 键 词： | 重力场 砂岩型铀矿 层间氧化带型 氧化还原过渡带 成矿条件 |
Correlation of Gravity Field Characteristics with Sandstone-type Uranium Deposit and Its Geological Significance |
| |
| FENG Zhi-bing,NIE Feng-jun,JIANG Li,ZENG Jian-gang,YAN Zhao-bin,LI Hong-xin. Correlation of Gravity Field Characteristics with Sandstone-type Uranium Deposit and Its Geological Significance[J]. Geoscience of Geosciences, 2014, 28(4): 841-849 |
| |
| Authors: | FENG Zhi-bing NIE Feng-jun JIANG Li ZENG Jian-gang YAN Zhao-bin LI Hong-xin |
| |
| Affiliation: | (1.Key Laboratory of Nuclear Resources and Environment，Ministry of Education，East China Institute of Technology, ;Nanchang,Jiangxi330013,China；2.School of Nuclear Engineering and Geophysics，;Ministry of Education，East China Institute of Technology， Nanchang，Jiangxi330013,China；;3.School of Geophysics and Information Technology，China University of Geosciences，Beijing100083,China) |
| |
| Abstract: | Gravity anomalies can well reflect information of the rock under the ground. There is a close relationship between distribution features of sandstone-type uranium deposit with gravitational field. Sandstone-type uranium deposit is mainly distributed in the second step regions of Bouguer gravity in China. What’s more，most of sandstone-type uranium deposits lie at the gravity gradient belt, which are close to the high-value gravitational field area. Based on the ore-formation mechanism of sandstone-type uranium deposit, analysis of features of tectonic evolution and rock of the major uranium-bearing basins, it is considered that subsequent relatively stable tectonic setting is beneficial to occurrence of sandstone-type uranium deposits in uranium-bearing basins of the second step regions. Orographic uplift benefits the denudation of uranium-bearing rock and migration of groundwater bearing oxygen and uranium, and faults have also played important roles in formation of the sandstone-type uranium deposit. Geographical changes cause the gravity field gradient. Structure fractures and composition changes of formation rock may induce disturbance of gravity anomaly contour lines. Therefore, the variation of gravity can be used to predict target areas of sandstone type uranium deposit exploration. Taking Qianjiadian uranium deposit in Songliao basin as an example, this study discusses the correlation between gravity field characteristics with sandstone-type uranium deposits, reflecting its practical application. |
| |
| Keywords: | gravity field sandstone-type uranium deposit interlayer oxidation zone type redox transitional zone mineralization condition |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《现代地质》浏览原始摘要信息 |
|
点击此处可从《现代地质》下载全文 |
