Characteristics of carbonatites from the northern part of the Korean Peninsula: A perspective from distribution, geology and geochemistry

Jinkon Ju, Yunsong Kim, Mansik Gang
2020 Geoscience Frontiers  
Please cite this article as: Ju, J., Kim, Y., Gang, M., Characteristics of carbonatites from the northern part of the Korean Peninsula: A perspective from distribution, geology and geochemistry, Geoscience Frontiers, https://doi. Abstract 12 The present study introduces the carbonatite in the northern part of the Korean Peninsula for the first time. 13 Recent exploration and development of the phosphorus-bearing carbonate rocks in the area have 14 accumulated new geological data which gave us
more » ... ata which gave us an opportunity to study origin of the carbonate rocks. We 15 conducted geological survey, geochemical analyses of trace elements and rare earth elements, and carbon 16 and oxygen isotope analyses for the carbonatites from Ssangryong, Pungnyon, Yongyu and Puhung districts 17 of the northern part of the Korean peninsula. This research confirms that the phosphorus-bearing carbonate 18 rocks are carbonatite originating from the mantle. The studied carbonatites are distributed at the junctions of 19 ring and linear structures or around their margins and contain a greater amount of REEs, Y, and Sr than 20 carbonate rocks. The carbonatites in Yongyu and Puhung area show evidence that they were formed from 21 mantle plume generated at the lower mantle and display similar fractionation characteristics to carbonatites 22 in Barrado Itapirapua in Brazil and Kalkfeld and Ondurakorume in Namibia. REE patterns of the 23 carbonatites are typical of carbonatites and the carbon and oxygen isotope analyses demonstrate that the 24 carbonatites were originated from mantle. The carbonatites from the northern part of the Korean Peninsula 25 have a great potential for sources of REE, Y, PGE (platinum group elements), copper, and gold. 26 27 Keyword 28 Carbonatite; Rare-earth elements; Stable isotope composition; phoscorite; platinum group elements ; Korean 29 peninsula; 30 31 Recently, new carbonatites have been being discovered in the world. The known numbers of carbonatite Analytical results of satellite images show that the carbonatites are distributed where ring-shaped 68 structures intersect linear structures. This distribution pattern was also documented in previous studies (e.g., 69 Woolley and Kempe, 1989; Woolley and Kjarsgaard, 2008b) that reported that carbonatites are related to 70 fractures and mantle plume. 71 The Pungnyon carbonatite is in contact with a very large and small ring-shaped structure and located 72 where linear structures of NE and NS in orientation cross each other (Fig 2a) . The Buhung carbonatite is 106 The carbonatite intrusions produced intense metasomatic reactions, such as calcification of pyroxenes, 107 nephelines, and feldspars, cancrinitization of nephelines and albites, diopsidization and tremolitization of 108 nephelines, and biotitization of amphiboles. Many metasomatic rocks occur closer to country rock in the 109 contacts between carbonatites and country rocks such as alkaline pyroxenites, nephelinites, and nepheline 110 syenites. The metasomatic rocks composed of pyroxene, amphibole, phlogopite, apatite, and calcite occur in 111 the contacts between phoscorites and alkaline pyroxenites, and those composed of amphibole, phlogopite,
doi:10.1016/j.gsf.2020.02.005 fatcat:if4alh7xgzdmfcqzpsiexeigha