贵州织金磷块岩型稀土矿地球化学特征

发布时间：2018-04-05 06:53

本文选题：磷块岩型稀土矿　切入点：矿石特征　出处：《矿物学报》2017年06期

【摘要】：贵州织金磷块岩型稀土矿产于梅树村期戈仲伍组含磷地层,现探明资源量350万吨,其中Y元素占30%以上,为超大型稀土矿床。本文选取4个典型钻孔、一处露头和一采矿坑进行采样,并利用扫描电镜、电子探针、X荧光光谱、和电感耦合等离子体质谱仪对样品的矿石特征和地球化学特征进行了分析。结果表明,稀土元素主要富集于戈仲武组下部的砂屑磷块岩和具层纹构造磷块岩的深色部分,不以独立矿物形式存在,而与磷灰石关系密切。从Fe/Ti、(Fe+Mn)/Ti、Al/(Al+Fe+Mn)比值,As和Sb富集情况,U-Th关系,稀土元素配分模式,δEu异常情况,均反映含矿岩系具有热水沉积成因特征,综合分析认为,戈仲伍组富稀土样品具有热水和风化特征,稀土富集可能与热水沉积或风化改造有关。
[Abstract]:The rock-type rare earth mineral of Zhijin phosphate block in Guizhou Province is located in the Phosphorus-bearing strata of the Gozhongwu formation in Meishicun period. The proved resources are 3.5 million tons, of which more than 30% are Y elements, which are super large rare earth deposits.In this paper, four typical boreholes, one outcrop and one mining pit are selected for sampling. The ore and geochemical characteristics of the samples are analyzed by means of scanning electron microscope, electron probe X-ray fluorescence spectroscopy and inductively coupled plasma mass spectrometer.The results show that the rare earth elements are mainly concentrated in the dark part of the sand-chip phosphorite and laminated structural phosphorite in the lower part of the Gozhongwu formation and do not exist in the form of independent minerals, but are closely related to apatite.The U-Th relationship between the enrichment of as and SB, the REE distribution model and 未 EU anomaly all reflect that the ore-bearing rock series has the genetic characteristics of hot water deposition. The comprehensive analysis shows that the rich rare earth samples of the Gozhongwu formation have the characteristics of hot water and weathering.Rare earth enrichment may be related to hot water deposition or weathering.
【作者单位】：中国科学院地球化学研究所矿床地球化学国家重点实验室;中国科学院大学;四川省地质工程勘察院;
【基金】：贵州省国土资源厅项目(编号:2016-09-1)
【分类号】：P618.7

【相似文献】