Petrology and Geochemistry of Granitoid from South Sulawesi, Indonesia: Implication for Rare Earth Element (REE) Occurrences
), K. Watanabe(2), K. Yonezu(3),
(1) Department of Geology Engineering, Faculty of Engineering, Hasanuddin University, 90245, Makassar, Indonesia
(2) Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan
(3) Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan
Corresponding Author
Abstract
This study reports petrology and geochemistry of potential rare earth elements (REE) bearing granitoid from South Sulawesi. The granitoid consists of monzogranite, granodiorite and diorite with subordinate of quartz monzonite, monzodiorite and syenite. Major and trace element analysis were determined using XRF method while trace element and rare earth element composition were determined by ICP-MS method. Geochemical study suggested that the granitoid were metaluminous series and “I-type†granitoid. They were furthered classified as calc alkaline series in AFM diagram. The total REE concentration in the granitoids range from 279 ppm to 400 ppm whereas total REE + Y contents up to 305 ppm for Polewali and 428 ppm for Masamba granitoid. Chondrite normalized REE patterns were characterized by enrichment of LREE with the depletion of heavy HREE. REE-bearing mineral were detected as zircon, apatite and monazite as shown by the positive correlation between Zr and P2O5 contents in bulk rock with REE content.
Keywords
Petrology, geochemistry, granitoid, rare earth element, Sulawesi
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