Japan Geoscience Union Meeting 2018

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[EJ] Poster

S (Solid Earth Sciences) » S-RD Resources, Mineral Deposit & Resource Exploration

[S-RD33] Resource Geology

Wed. May 23, 2018 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Tsubasa Otake(Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University), Daisuke Araoka(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Ryohei Takahashi(秋田大学大学院国際資源学研究科, 共同), Tatsuo Nozaki(Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology)

[SRD33-P14] Relationship between abundances of REE-bearing minerals in granites and the ion-adsorption type ore formation: Case study of the Serra Verde deposit in Brazil

*Kenzo Sanematsu1, Yoshiaki Kon1, Takaomi Yokoyama D.1 (1.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

Keywords:Granite, Rare earth elements, Deposit, Ion-adsorption type, Serra Verde, Brazil

The Serra Verde REE (rare earth elements) deposit located in Goiás and Tocantins provinces of Brazil is one of ion-adsorption type deposits found outside of China. The REE ores are weathered granitic rocks and sediments underlain by the Serra Dourada Granite consisting of alkali granite and gneissic granite. The granites are high in REE (300 – 1300 ppm, approximately) and contains different REE-bearing minerals such as bastnaesite-(Ce), allanite-(Ce), monazite-(Ce), xenotime-(Y), apatite and zircon. In this study, we report abundances of REE-bearing minerals in the granites and relationship with ion-adsorption type ore formation because a percentage of ion-exchangeable REE in the ores is influenced by assemblage of REE-bearing minerals in the parent granitic rocks.