Abstract
The Mushgai khudag volcanic-plutonic complex consists of four REE mineralization zones: carbonatite zone, apatite zone, magnetite zone, and monazite zone. REE mineralization occurs within peripheries of alkaline magmatic rocks which consist of porphyritic syenite, microsyenite and quartz syenites. Three types of LREE-rich apatite can be found in the carbonatite, apatite, and monazite zones. Crystal-1 type of apatite exists as hexagonal prismatic shape and is mostly found in the apatite zone, and in syenite. Crystal-2 type of apatite can be exposed also at the apatite zone, and carbonatite zone as brecciated massive crystalline aggregate. Crystal-3 type of apatite demonstrates the compositional zoning texture with monazite as inter-zoning, and is only found in monazite zone. The LREE-bearing apatites from the Mushgai khudag complex are mostly fluorapatite to hydroxyl-bearing fluorapatite with variable REE content. Apatites from the monazite zone present individual sulfur-rich monazite grain, and are formed by comprehensive substitutions.
Highlights
The Mushgai khudag alkaline volcanic-plutonic complex with REE-Sr-Fe-F-P mineralization is located inHow to cite this paper: Enkhbayar, D., Seo, J., Choi, S.-G., Lee, Y.J. and Batmunkh, E. (2016) Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia
Fluorapatite and hydroxyl-bearing fluorapatite can be found in all mineralization zones, whereas monazite distributed limited area
S and Sr-rich individual monazite grains have been found in the rim of fluorapatite and hydroxyl-bearing fluorapatite in the samples from the Monazite zone
Summary
The Mushgai khudag alkaline volcanic-plutonic complex with REE-Sr-Fe-F-P mineralization is located inHow to cite this paper: Enkhbayar, D., Seo, J., Choi, S.-G., Lee, Y.J. and Batmunkh, E. (2016) Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia. The Mushgai khudag alkaline volcanic-plutonic complex with REE-Sr-Fe-F-P mineralization is located in. (2016) Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia. Russian and Mongolian Joint Geological Expedition discovered the Mushgai khudag complex in early 1970’s. Number of new studies about alkaline rocks, carbonatites, and REE mineralization the deposit has been completed [1]-[4]. Geological and geochemical surveys demonstrated a wide occurrence of ore-bearing rocks containing rare earth elements with economic grades, especially light lanthanides and strontium and barium [5]. The alkaline complex is composed of various types of LREE enriched rocks significantly apatite rocks and monazite-rich apatite rock. LREE-rich apatites contain up to 14 % LREE2O3, while monazite up to 68% LREE2O3 (LREE2O3 represent sum of La2O3, Ce2O3, Nd2O3, and Pr2O3)
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