Micro X-ray fluorescence (µXRF) is an advanced analysis technique from conventional XRF (X-Ray Fluorescence) that allows analysis of smaller areas even inclusions with irregular shapes and non-homogeneous elements. This method has a spatial resolution up to 10 µm depends on the energy by X-rays so that the excitation beam at the smallest point of the sample surface can be detected. This study explains the application of µXRF to determine the type of deposit and the formation of uranium contained in Takandeang Village, Tapalang District, Mamuju Regency, West Sulawesi. The study began with surface geological and radiometry mapping, continued with geological drilling. Collected samples then undergo petrology, petrographic, and geochemical analysis. Three collected samples from drilling sample were analysed using the µXRF. From the analyses we found that the highest uranium anomaly is found in leucitite autobreccias. The anomaly that occurred in the study area was in the form of reconcentration of uranium elements in autobreccia rocks caused by hydrothermal activity which was also supported by magma type and structural control in the study area. In this study case we found that µXRF is usefull for uranium exploration.
Pottery is a ceramic which generally used as household utensils or religious necessities such as spiritual ceremonies. This object has been used by society since long time ago that make it has certain historical and cultural values. One problem with pottery that it is hard to define its source. We believe that mineralogy could help finding the source of the pottery by comparing mineralogy of pottery and mineralogy of alluvial sand that usually used for pottery. This study was carried out to analyze the pottery-forming material of pottery fragments in the Muaro Jambi Temple complex and compare them with the Batanghari River sediments on the opposite to the temple. Data retrieval is done by collecting pottery fragments in the excavation field and taking sand samples in the downstream of the Batanghari River. The fragments of pottery and river sands were separated based on their texture and analyzed using microscope. Each material will be described based on its physical appearance and frequency of existence. From the study we found that minerals found in the pottery fragments from Muaro Jambi have similarity with the mineralogy of alluvial sand from Batanghari River. Thus, it might be a good indication that there is a correlation between them. From this research, we also conclude that the mineralogy characteristic could be useful for identifying the source of pottery.
Sand as part of sedimentary material can be consisted of single mineral fragments, rock fragments, or even biogenic materials. Nusa Tenggara is an archipelago that was formed due to the meeting of the Indian Ocean Plate and the Eurasian Plate which supported by other geological processes. The stratigraphy of these islands is dominated by carbonate rocks, volcanic rocks, coastal deposits and alluvium. Due to the variation of the rock composition, there is a large possibility that mineralogy sediment material found in the coastal area will be different from one place to other. This study aims to analyse variations on coastal deposits in a number of specific locations in the Nusa Tenggara Islands. This study was carried out by mineralogical and petrographic analysis of sand samples from six coastal areas in Nusa Tenggara Islands. The mineral composition of coastal sand was identified using hand loupe to give general understanding. After that, the petrographic analyses were implemented to give detailed mineralogical analyses of each sand. Mineralogical studies are specialized in study of the physical structure and chemical composition of each mineral, while petrographic studies can support the details of every physical information obtained through macroscopic observations. Data are retrieved by taking sand samples directly in the research field in a certain amount. This sample is separated then for macroscopic analysis while the other parts are made in a thin section. The thin section will be used for petrographic analysis under a polarization microscope. The analysis result shows that there are variations in coastal sediment components and it most likely does to different rock found around such area.
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