Setting of the REE-deposits of Bayan Obo (China), Mushugay-Khuduk (Mongolia), and Cholsan (North Korea) in the pattern of transregional structural discontinuities
published: Nov 27, 1995
ArtNo. ESP136000501008, Price: 19.00 €
Some of the papers of the IAGOD/CTOD workshop, held at the 29th IGC in Kyoto, Japan (September 1992) and published in the present issue of Global Tectonics and Metallogeny, reviewed the structural settings and parameters leading to some of the largest known concentrations of rare earth elements. Both Drew & Meng (1995) and Chao et al. (1995) stress that the REE- Fe-Nb deposit of Bayan Obo in Inner Mongolia, China, is located at the northern edge or flank of the North China (Sino-Korean) Archean-Proterozoic craton. According to Drew & Meng (op. cit) the northern edge of the craton resulted from an intracontinental rift at 1.7 to 1.85 Ga. The principal orebodies are hydrothermal replacements of carbonate rocks and are associated with the Proterozoic rifting event. The orebodies and associated altered rocks were subsequently metamorphosed and uplifted during Hercynian time.