Trace elements distribution, including rare earth elements (REEs), in stream sediments of an abandoned U mining site in the Eastern Carpathians, Romania, were of high concern of interest in the present work. A total number of 40 riverbed sediments samples collected from the Bistricioara River and local tributaries (Primatar, Bradul, Prisacani, Barasau, Grintiesul Mare and Valea Seaca) were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) and energy dispersive X-ray fluorescence spectrometry (XRF). All REEs including La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu were identified and quantified in the present work using ICP-MS technique. For other 24 elements (Ti, V, Cr, Co, Zn, Li, Be, Rb, Sr, Y, Sc, Zr, Nb, Sb, Ba, Ta, W, Pb, U, Ni, Cu, Mo, As, Th) similar information was obtained either by ICP-MS or XRF techniques. The impact and the relevance of the obtained data base might be significant at a local scale of about 50 km².

Enrichments of some trace elements of interest in comparison to the upper continental crust allowed discrimination between various mineralization processes specific for the investigated areas. Uranium mineralization and Paltin-type (Pb, Zn) mineralization seems to be specific for the NW area of the investigated region. Negative anomaly characteristic for the upper crustal rocks was identified for Eu and Ce elements. Evidences were obtained also for the existence of ultramafic rocks (Ni, Cr, Co and V) in the investigated riverbed sediments. The observation was also confirmed by the binary plots analysis of Th/Cr vs. Th/Co and Cr/V vs. Y/Ni pairs. From the investigated tributaries to Bistricioara River, Barasau seems to exert the highest influence on the abundances of REEss in the entire area. Most probably some chemical parameters such as the pH of the water streams influence leaching and depletions of some chemical constituents in various minerals specific for the region.

The existence of magnetite, garnets, pyrite and sillimanite minerals was confirmed by SEM-EDAX and XRF analysis, as well by optical microscopy. Principal Component Analysis runs confirmed the association of some chemical elements in the riverbed sediments in close connection with the minerals from which they originate.

The present work reports for the first time upon the authors knowledge clear scientific evidence and chemical information concerning the geology and geochemistry, i.e. transition metals, high field strength elements, alkali and alkaline earth elements, rare earth elements (REEs) and others, in stream sediments crossing the Tulghes-Grinties mining area (Eastern Carpathians, Romania). For the analysed REEs this is the first study reporting consistent information on the concentrations of the entire array of both light REEs (six elements) and heavy REEs (ten elements) in Bistricioara Basin stream sediments. Relevant scientific data related to geochemical characteristics of ultramafic rocks existent in the investigated area were also generated. Moreover, data reported in the present work might be considered as a reference geochemical database relevant for the investigated area, which can be used as a trustworthy input for a systematic national geochemical atlas.

罗马尼亚东部喀尔巴阡山脉废弃 U 矿场的河流沉积物中的微量元素分布，包括稀土元素 (REE)，是当前工作中高度关注的问题。通过电感耦合等离子体质谱 (ICP-MS) 和能量色散 X 射线分析从 Bistricioara 河和当地支流（Primatar、Bradul、Prisacani、Barasau、Grintiesul Mare 和 Valea Seaca）收集的总共 40 个河床沉积物样品荧光光谱法 (XRF)。在目前的工作中，使用 ICP-MS 技术对包括 La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb 和 Lu 在内的所有 REE 进行了鉴定和定量。对于其他 24 种元素（Ti、V、Cr、Co、Zn、Li、Be、Rb、Sr、Y、Sc、Zr、Nb、Sb、Ba、Ta、W、Pb、U、Ni、Cu、Mo、As , Th) 类似的信息是通过 ICP-MS 或 XRF 技术获得的。² .

与上大陆地壳相比，某些感兴趣的微量元素的富集允许区分特定于调查区域的各种矿化过程。铀矿化和 Paltin 型（Pb、Zn）矿化似乎是调查区域的 NW 地区特有的。上地壳岩石的负异常特征被确定为 Eu 和 Ce 元素。还获得了研究河床沉积物中存在超基性岩（镍、铬、钴和钒）的证据。Th/Cr vs的二元图分析也证实了这一观察结果。Th/Co 和 Cr/V对比Y/Ni 对。从调查的支流到 Bistricioara 河，Barasau 似乎对整个地区的 REEss 丰度产生了最大的影响。最有可能的是，一些化学参数，例如水流的 pH 值，会影响该地区特有的各种矿物质中某些化学成分的浸出和消耗。

SEM-EDAX 和 XRF 分析以及光学显微镜证实了磁铁矿、石榴石、黄铁矿和硅线石矿物的存在。主成分分析运行证实了河床沉积物中某些化学元素与其来源的矿物质密切相关。

目前的工作首次报告了作者关于地质和地球化学的明确科学证据和化学信息，即在穿过 Tulghes-Grinties 矿区（东喀尔巴阡山脉，罗马尼亚）的河流沉积物中的过渡金属、高场强元素、碱金属和碱土元素、稀土元素 (REE) 等。对于分析的 REE，这是第一项报告关于 Bistricioara 盆地河流沉积物中轻 REE（六种元素）和重 REE（十种元素）的整个阵列浓度的一致信息的研究。还获得了与调查区存在的超基性岩地球化学特征相关的科学数据。此外，目前工作中报告的数据可被视为与调查区域相关的参考地球化学数据库，可作为系统国家地球化学图谱的可靠输入。