鄂尔多斯盆地东北部纳岭沟铀矿床黏土矿物特征
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摘要
鄂尔多斯盆地东北部纳岭沟铀矿床是近年来发现的大型砂岩型铀矿床。矿床黏土蚀变强烈,与铀成矿关系密切。本文通过X射线衍射(XRD)和扫描电子显微镜(SEM)分析测试,重点研究了纳岭沟铀矿床不同地球化学分带砂岩中的黏土矿物含量、类型及黏土矿物之间相互转化的关系,探讨了各地球化学分带的黏土矿物特征。研究发现,纳岭沟铀矿床各地球化学分带中黏土矿物以蒙脱石为主,高岭石次之,其次为绿泥石和伊利石;各地球化学分带的黏土矿物在总量上虽然相差不大,但是对具体黏土矿物的含量而言却差异明显;纳岭沟铀矿床黏土矿物对铀的吸附能力主要体现在蒙脱石,高岭石含量的变化可以反映流体环境的变化。
Nalinggou uranium deposit in the northeastern Ordos Basin is a large sandstone type uranium deposit discovered in recent years. The deposit bears strong clay alteration which is closely related to uranium mineralization. By means of X ray diffraction(XRD) and scanning electron microscopy(SEM)analysis and testing, this paper focused on the content, the types of clay mineral and their interaction in the sandstone of different geochemical zones in Nalinggou uranium deposit, and discussed the characteristics of clay minerals in different geochemical zones. The result showed that clay minerals in different geochemical zones of Nalingou uranium deposit are dominated by montmorillonite, followed by kaolinite, and then chlorite and illite; although the total amount of clay minerals in each geochemical zone is not much different, there is a significant difference in the content of specific clay minerals. The uranium adsorption capacity of clay minerals is mainly determined by montmorillonite, while the content change of kaolinite can reflect the environment change of fluid.
Nalinggou uranium deposit in the northeastern Ordos Basin is a large sandstone type uranium deposit discovered in recent years. The deposit bears strong clay alteration which is closely related to uranium mineralization. By means of X ray diffraction(XRD) and scanning electron microscopy(SEM)analysis and testing, this paper focused on the content, the types of clay mineral and their interaction in the sandstone of different geochemical zones in Nalinggou uranium deposit, and discussed the characteristics of clay minerals in different geochemical zones. The result showed that clay minerals in different geochemical zones of Nalingou uranium deposit are dominated by montmorillonite, followed by kaolinite, and then chlorite and illite; although the total amount of clay minerals in each geochemical zone is not much different, there is a significant difference in the content of specific clay minerals. The uranium adsorption capacity of clay minerals is mainly determined by montmorillonite, while the content change of kaolinite can reflect the environment change of fluid.
引文
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[11]李子颖,方锡珩,陈安平,等.鄂尔多斯盆地北部砂岩型铀矿目标层灰绿色砂岩成因[J].中国科学(D辑:地球科学), 2007, 37(增刊I):139-146.
[12]王毅,杨伟利,邓军,等.多种能源矿产同盆共存富集成矿(藏)体系与协同勘探—以鄂尔多斯盆地为例[J].地质学报, 2014, 88(5):815-824.
[13]焦养泉,陈安平,王敏芳,等.鄂尔多斯盆地东北部直罗组底部砂体成因分析—砂岩型铀矿床预测的空间定位基础[J].沉积学报, 2005, 23(3):371-378.
[14]刘宝珺.沉积岩石学[M].北京:地质出版社,1980, 37-52.
[15]李子颖,陈安平,方锡珩.鄂尔多斯盆地北部地浸砂岩型铀矿时空定位和成矿机理研究[R].北京:核工业北京地质研究院, 2005.
[2]易超,韩效忠,李西得,等.鄂尔多斯盆地东北部直罗组砂岩岩石学特征与铀矿化关系研究[J].高校地质学报, 2014, 20(2):185-197.
[3]易超,郑云龙,王明太.东胜地区直罗组铀储层非均质性特征及其与铀成矿的关系[J].铀矿地质,2013, 29(3):139-145, 178.
[4]戴明建,彭云彪,焦养泉,等.纳岭沟铀矿床局部隔水层分布样式及对铀矿开发的影响[J].世界核地质科学, 2016, 33(2):84-90.
[5]肖新建.东胜地区砂岩铀矿低温流体成矿作用地球化学研究[D].北京:核工业北京地质研究院, 2004.
[6]罗晶晶,吴柏林,李艳青,等.鄂尔多斯盆地东北部纳岭沟铀矿床元素地球化学特征及其地质意义[J].铀矿地质, 2017, 33(2):89-96.
[7]刘璐,彭云彪,戴明建.鄂尔多斯盆地北东部区域大规模叠合氧化形成条件与铀成矿作用[J].世界核地质科学, 2018, 35(1):16-23.
[8]李子颖,方锡珩,陈安平,等.鄂尔多斯盆地东胜砂岩型铀矿叠合成矿模式[J].矿床地质,2010, 29(S1):145-146.
[9]李子颖,方锡珩,陈安平,等.鄂尔多斯盆地东北部砂岩型铀矿叠合成矿模式[J].铀矿地质,2009, 25(2):65-70, 84.
[10]丁万烈.绿色蚀变带的地球化学性质及其找矿意义探讨[J].铀矿地质, 2003, 19(5):277-282.
[11]李子颖,方锡珩,陈安平,等.鄂尔多斯盆地北部砂岩型铀矿目标层灰绿色砂岩成因[J].中国科学(D辑:地球科学), 2007, 37(增刊I):139-146.
[12]王毅,杨伟利,邓军,等.多种能源矿产同盆共存富集成矿(藏)体系与协同勘探—以鄂尔多斯盆地为例[J].地质学报, 2014, 88(5):815-824.
[13]焦养泉,陈安平,王敏芳,等.鄂尔多斯盆地东北部直罗组底部砂体成因分析—砂岩型铀矿床预测的空间定位基础[J].沉积学报, 2005, 23(3):371-378.
[14]刘宝珺.沉积岩石学[M].北京:地质出版社,1980, 37-52.
[15]李子颖,陈安平,方锡珩.鄂尔多斯盆地北部地浸砂岩型铀矿时空定位和成矿机理研究[R].北京:核工业北京地质研究院, 2005.