A special orogenic-type rare earth element deposit in Maoniuping, Sichuan,China: Geology and geochemistry

Citation
Dh. Wang et al., A special orogenic-type rare earth element deposit in Maoniuping, Sichuan,China: Geology and geochemistry, RESOUR GEOL, 51(3), 2001, pp. 177-188
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
RESOURCE GEOLOGY
ISSN journal
1344-1698 → ACNP
Volume
51
Issue
3
Year of publication
2001
Pages
177 - 188
Database
ISI
SICI code
1344-1698(2001)51:3<177:ASOREE>2.0.ZU;2-K
Abstract
The Maoniuping REE deposit is the second largest light rare earth elements deposit in China, explored recently in the northern Jinpingshan Mountains, a Cenozoic intracontinental orogenic belt in southwestern China. It is a ve in-type deposit hosted within, and genetically related to, carbonatite-alka lic complex. Field investigation and new geochemical data of the carbonatit es from the carbonatite-alkalic complex support an igneous origin for the M aoniuping carbonatites and related REE mineralization. Carbonatite itself c arries rare earth elements which were enriched by hydrothermal solution. It is known that most of the REE deposits related to carbonatite-alkalic co mplexes were formed in relatively stable tectonic setting such as cratonic or rifting environment. The Maoniuping deposit, however, was formed during the processes of Cenozoic orogeny. Although the Maoniuping deposit is locat ed in the north sector of the Panxi paleo-rift zone, the rift had been clos ed before early Cenozoic and evolved into an intracontinental orogenic belt , i.e., the Jinpingshan Orogen, which was formed since later Mesozoic to ea rly Cenozoic. Geochronological. and geochemical data also prove that the Ma oniuping REE deposit was formed in an intracontinental orogenic belt instea d of rift system or stationary block. The Maoniuping REE deposit is similar to the Mountain Pass REE deposit in m any respects such as the high contents of bastnaesite and barite, the low c ontent of niobium, and the common occurrence of sulfides. The discovery of the Maoniuping deposit and other REE deposits during the past two decades s uggest a good potential for prospecting REE deposits along the alkalic comp lex belt located on the eastern side of the Qinghai-Xizang-West Sichuan Pla teau.