西婆罗洲Menukung地区砂岩型铀矿床地质、地球化学和辐射测量研究

W. Cakrabuana, Ekky Novia Stasia Argianto, R. C. Ciputra, Dhatu Kamajati
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引用次数: 1

摘要

BATAN自1969年以来一直在西婆罗洲进行铀勘探。目前,在卡兰地区的铀矿勘探主要集中在变质岩型铀矿。前人的研究认为,矿化铀来源于由长英质-中质火成岩组成的Sepauk Tonalite,赋存于Pinoh变质岩的中级片理和非片理变质岩中。随着铀勘探的发展,国际原子能机构(IAEA)引入了砂岩型铀矿化概念,提供了一种更具成本效益的开采过程。由于Melawi盆地位于Schwaner山Sepauk Tonalite的下游,因此它成为砂岩型铀矿床勘探的一个有吸引力的可能位置。Melawi盆地以砂岩为主的Tebidah组若存在还原带,可圈闭地下水中的活动铀,则可成为砂岩型铀矿床的寄主岩。在梅努孔地区进行了地质填图、地球化学采样和辐射测量,证实了这一假设。它位于特比达组东部,含丰富的碳质泥岩,与煤层伴生。活动铀含量分析显示,研究区Tebidah组中部铀含量异常为36 ~ 60 ppm,而放射性测量数据显示,铀含量异常为6.5 ~ 11.3 ppm。在这些地点,观察到煤和碳质砂岩。这些数据表明,存在一种还原环境,对铀捕获有利。认为梅努孔地区存在砂岩型铀矿化的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geological, Geochemical, and Radiometric Study of Sandstone-Type Uranium Deposit Exploration in Menukung Area, West Borneo
BATAN has been carried out uranium exploration in West Borneo since 1969. So far, the exploration is focused on metamorphite-type uranium deposits in Kalan Area. The previous study concluded that mineralized uranium is originated from Sepauk Tonalite consisted of felsic-intermediate igneous rocks, and is hosted in medium-grade foliated and non-foliated metamorphic rocks of Pinoh Metamorphite. As uranium exploration develops, the International Atomic Energy Agency (IAEA) introduces the sandstone-type uranium mineralization concept that offers a more cost-effective mining process. The Melawi Basin becomes an attractive probable location for sandstone-type uranium deposit exploration since it is situated downstream of Schwaner Mountain's Sepauk Tonalite. The sandstone-dominated Tebidah Formation of Melawi Basin can be the host rock for sandstone-type uranium deposit if there is a reduction zone to trap the mobile uranium in the groundwater. The geological mapping, geochemical sampling, and radiometric survey were conducted in Menukung Area to prove the hypothesis. It is located in the eastern part of the Tebidah Formation, which contains abundant carbonaceous mudstones associated with coal seams. Mobile uranium content analysis showed the anomaly of 36–60 ppm at the central of Tebidah Formation at the study area, while radiometric data denoted the anomaly of 6.5–11.3 ppm eU. At those locations, coal and carbonaceous sandstone were observed. Those data indicate the presence of a reductive environment that gives the advantage to uranium trapping. It can be concluded that there is a possibility of the occurrence of sandstone-type uranium mineralization in the Menukung Area.
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