Affiliation:
1. School of Gemology, China University of Geosciences (Beijing), No. 29 Xueyuan Road, Haidian District, Beijing 100083, China
Abstract
The Chuncheon nephrite deposit in South Korea is one of the major nephrite deposits in the world, but its origin has been rarely studied. This study explores the mineralogical and geochemical characteristics of the Chuncheon nephrite using a polarizing microscope, an electron microprobe, laser ablation, inductively coupled plasma mass spectrometry, and hydrogen–oxygen isotope analyses and compares them with dolomite-related nephrite worldwide. The main mineral of Chuncheon nephrite is tremolite, which has a felted blastic texture, secondary filling texture, and metasomatic pseudomorphic texture that nephrites from other regions do not have. Chuncheon nephrite is dolomite-related; the total content of rare earth elements is generally low, with highly variable positive and negative Eu anomalies and weak positive Ce anomalies; and the light rare earth elements are enriched. The Chuncheon nephrite formed in an anaerobic alkaline environment with a low degree of mineralization, and the hydrothermal fluids are predominantly meteoric water. Nephrite from different regions has different geochemical characteristics as well as different abundances of rare earth element contents. According to the content and range of elements, such as δCe, δEu, ΣREE, (La/Sm)N, and other rare earth elements, dolomite-type nephrite from different origins can be roughly distinguished.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
Reference59 articles.
1. Nephrites of East Siberia: Geochemical features and problems of genesis;Burtseva;Russ. Geol. Geophys.,2015
2. Liu, X.F. (2010). Gemological and Mineralogical Study of White Nephrite from Dakeximu Region in Russia. [Master’s Thesis, China University of Geosciences (Beijing)]. (In Chinese with English Abstract).
3. Research on Petrologic Character of Nephrite Jade from Baikal Lake Region in Russia;Zhang;J. Gems Gemol.,2001
4. Petrographic and microprobe study of nephrites from Lower Silesia (SW Poland);Gil;Geol. Q.,2013
5. Nephrite from Złoty Stok (Sudetes, SW Poland): Petrological, geochemical, and isotopic evidence for a dolomite-related origin;Gil;Can. Mineral.,2015