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首页> 外文期刊>Geologia USP : Série Científica >Dados geoqu?-micos e gamaespectrom??tricos na avalia?§?￡o do potencial de corpos ?-gneos brasilianos para gerar concentra?§?μes de elementos terras raras do tipo ion adsorption clay (Terreno Apia?--Guaxup??, estados de Minas Gerais e S?￡o Paulo, Brasil)
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Dados geoqu?-micos e gamaespectrom??tricos na avalia?§?￡o do potencial de corpos ?-gneos brasilianos para gerar concentra?§?μes de elementos terras raras do tipo ion adsorption clay (Terreno Apia?--Guaxup??, estados de Minas Gerais e S?￡o Paulo, Brasil)

机译：地球化学和伽玛光谱数据，用于评估巴西β基因体产生离子吸附黏土类型的稀土元素（Terra Apia？-Guaxup？ ，米纳斯吉拉斯州和巴西圣保罗州）

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The rare earth elements are of increasing importance in the world economy, mainly due to their applications in the technology??industry, which leads to the interest in prospecting mineral sources for these elements. In this context, a particular model??of mineralization known in China stands out as the main source of heavy rare earth elements (Eu to Lu) and yttrium??(Y),??less common than light rare earth elements (La to Sm). This deposit type, called ion adsorption clay, consists of weathering profiles developed from biotite and/or muscovite granites, where the exogenous concentration of rare earth elements is given by the adsorption of these elements by neoformed kaolinitic clays by the weathering process. Several characteristics affect the genesis of these mineralizations, where the presence of rare earth elements minerals very susceptible to weathering and developmental characteristics of the exogenous alteration are of great importance for this type of rare earth elements enrichment. The Apia?--Guaxupe Terrain, with a diversity of igneous bodies and Cenozoic weathering process, is an example of area with prospective potential to this deposit type. There are no descriptive information about rare earth elements (fluor)carbonate minerals, very susceptible to weathering and primordial to the genesis of these deposits, in these igneous bodies. Thus, the use of chemical informations and descriptions over accessory minerals and hydrothermal alteration to define the possibility of rare earth elements formation is necessary. In this work, the investigation of the potential enrichment of ion adsorption clay-type rare earth elements for this terrain was based on the use of published information of 16 syn-, tardi- and post-orogenic, Brasiliano igneous bodies,encompassing geologic, chemical (228 samples) and mineralogical data. The comparative analysis among this data and the bodies that generate these ion adsorption clay-type rare earth elements mineralization show similarities of five granitoids with Chinese granites that gave rise to these concentrations. Gamma-spectrometry data corroborate the presence of weathering profiles in these five bodies, indicating potential to advancing the research on this model of rare earth elements mineralization.
机译：稀土元素在世界经济中的重要性日益提高，这主要归因于稀土元素在技术工业中的应用，这引起了人们对寻找这些元素的矿物来源的兴趣。在这种情况下，中国已知的一种特殊的矿化模型是重稀土元素（Eu至Lu）和钇（Y）的主要来源，而后者比轻稀土元素（La至Sm）。这种沉积物类型称为离子吸附粘土，由黑云母和/或白云母花岗岩形成的风化剖面组成，其中稀土元素的外源浓度是通过风化过程中新形成的高岭土对这些元素的吸附而给出的。有几个特征影响这些矿化的成因，其中极易风化的稀土元素矿物的存在和外源蚀变的发育特征对于这种类型的稀土元素富集非常重要。 Apia？-Guaxupe地形具有多种火成体和新生代风化作用，是这类矿床具有潜在潜力的一个例子。在这些火成岩体中，没有关于稀土元素（氟）碳酸盐矿物的描述性信息，稀土元素（氟）碳酸盐矿物极易风化，并且对这些矿床的成因具有重要意义。因此，有必要使用化学信息和辅助矿物上的描述以及水热蚀变来确定稀土元素形成的可能性。在这项工作中，对离子吸附粘土型稀土元素在该地形上的潜在富集的研究是基于对已发表的16种同生，晚生和造山后的巴西利亚火成岩体的信息，包括地质，化学（228个样品）和矿物学数据。在这些数据和产生这些离子吸附粘土型稀土元素矿化作用的矿体之间的对比分析表明，五种花岗岩与中国花岗岩的相似性导致了这些浓度。伽马能谱数据证实了这五个矿体中存在风化剖面，这表明有可能推进这种稀土元素矿化模型的研究。

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