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Janchivlan complex, Janchivlan, Nailakh Soum, Töv Aimag, Mongolia

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Multistage granitic pluton with an outcrop area of about 1000 km2, intruded into a Devonian-Carboniferous accretionary complex and Cambrian metasedimentary sequences. The first stages consist of two-mica granites and alaskites which are preserved in the core of the pluton. The late stages include miarolitic pegmatites, tin greisens and Li-F granites which crystallized from highly differentiated Sn-Ta-Nb-Li-rich magmas. All of the different granitoids contain tantalum, niobium and REE-bearing accessory minerals in varying proportions.

Mineral List

Mineral list contains entries from the region specified including sub-localities

38 entries listed. 25 valid minerals.

Localities in this Region


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- Tumenbayar, B., Batbayar, M., and Grayson, R. (2000): Tantalite-Cassiterite-Ilmenite-Monazite-Gold Placers in Mongolia (Ta, Nb, Sn, Ti, REEs, Au). World Placer Journal 1, 160-174.

Mineral and/or Locality  
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