Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South MongoliaReport as inadecuate




Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia - Download this document for free, or read online. Document in PDF available to download.

The Mushgai khudagvolcanic-plutonic complex consists of four REE mineralization zones:carbonatite zone, apatite zone, magnetite zone, and monazite zone. REEmineralization occurs within peripheries of alkaline magmatic rocks whichconsist of porphyritic syenite, microsyenite and quartz syenites. Three typesof LREE-rich apatite can be found in the carbonatite, apatite, and monazitezones. Crystal-1 type of apatite exists as hexagonal prismatic shape and ismostly found in the apatite zone, and in syenite. Crystal-2 type of apatite canbe exposed also at the apatite zone, and carbonatite zone as brecciated massivecrystalline aggregate. Crystal-3 type of apatite demonstrates the compositionalzoning texture with monazite as inter-zoning, and is only found in monazitezone. The LREE-bearing apatites from the Mushgai khudag complex are mostlyfluorapatite 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.

KEYWORDS

Fluorapatite, Hydroxyl-Bearing Fluorapatite, Sulfur-Rich Monazite, Mushgai Khudag

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Enkhbayar, D. , Seo, J. , Choi, S. , Lee, Y. and Batmunkh, E. 2016 Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia. International Journal of Geosciences, 7, 20-31. doi: 10.4236-ijg.2016.71003.





Author: Dorjpalma Enkhbayar1*, Jieun Seo1, Seon-Gyu Choi1, Young Jae Lee1, Enkhbayar Batmunkh2

Source: http://www.scirp.org/



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