ABSTRACT The archeological site RS-TQ-141 is located in Rio Grande do Sul (Brazil) and belongs to the pre-colonial Guarani Tradition (between fifth and seventeenth century). The site extends to the bank of the Taquari River. About 200 small fragments of ceramic from the site present internal and/or external coating surfaces. Archaeometry analyses were applied in order to understand coating application mechanism. X-ray Fluorescence (XFR) analyses revealed that the main elements are iron, titanium, potassium, and calcium. Applying the micro Fourier Transform Interferometer (ATR-FTIR) method it was possible to differentiate white and red coatings produced with different types of (ocher) clays. ATR-FTIR was applied in order to try to distinguish the vessels use. The coatings were produced with the same groups of clays used for the manufacture of ceramics. The presence of at least two groups of clay is recorded: montmorillonite-like and kaolinite-like. The white coatings can be distinguished in the FTIR spectra by the presence of a carbonate peak. From this research, there does not seem to be any difference between internal and external coatings. Carbonyl materials were detected, both in the coating and in the production of the ceramics; the latter is probably related to pyrolysis.

中文翻译：

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前殖民时期瓜拉尼陶瓷生产的考古研究（巴西塔夸里）

摘要 RS-TQ-141 考古遗址位于南里奥格兰德（巴西），属于前殖民时期的瓜拉尼传统（5 至 17 世纪）。该场地延伸至塔夸里河岸边。来自现场的大约 200 个小陶瓷碎片呈现出内部和/或外部涂层表面。应用考古学分析以了解涂层应用机制。X 射线荧光 (XFR) 分析表明，主要元素是铁、钛、钾和钙。应用微傅立叶变换干涉仪 (ATR-FTIR) 方法可以区分由不同类型（赭石）粘土制成的白色和红色涂层。应用 ATR-FTIR 以尝试区分血管的使用。涂层是用与制造陶瓷相同的粘土组制成的。记录了至少两组粘土的存在：类蒙脱石和类高岭石。通过碳酸盐峰的存在，可以在 FTIR 光谱中区分白色涂层。从这项研究来看，内部和外部涂层之间似乎没有任何区别。在涂层和陶瓷生产中检测到羰基材料；后者可能与热解有关。在涂层和陶瓷生产中检测到羰基材料；后者可能与热解有关。在涂层和陶瓷生产中检测到羰基材料；后者可能与热解有关。