Luomo Be deposit, Jiulong County, Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture), Sichuan, Chinai

Regional Level Types
Luomo Be deposit	Deposit
Jiulong County	County
Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture)	Prefecture
Sichuan	Province
China	Country

The mining area is characterized by intense tectonic activity, and the faults and interlayer folds are the main mineralization-controlling structures. This deposit is situated in the northwest–western limb of the Jiulong syncline and the northeast–eastern limb of the Baitai anticline, and the main fault structures are the northwest-striking Zhari–Nari fault group and the northeast-striking Longxigou fault. The main strata exposed in the mining area are the metamorphosed fine-grained feldspar–quartz sandstone interlayered with sandy slate and biotite–quartz schist in the Zagunao group (T3z), followed by the metamorphosed feldspar–quartz sandstone, fine sandstone, siltstone, and sandy slate with variable thicknesses in the Zhuwo group (T3zw), and there are different levels of contact metamorphism near the intrusions. The Luomo beryllium deposit is located on the eastern edge of the Qiaopengzi granite and primarily occurs in the pegmatite veins within the internal and external contact zones of the intrusion. Fifty pegmatite veins have been identified in the mining area, predominantly consisting of microcline pegmatite and albite–microcline pegmatite. Thirty of these veins are mineralized with rare metals. The pegmatite veins have lengths of 40~600 m (with most measuring between 100 and 150 m) and thicknesses of 1~80 m (typically around 4 m). The veins within the internal contact zone of the intrusion are predominantly fine-veined and regular, while the veins in the external contact zone of the strata tend to follow schistosity planes and can expand into lens shaped bodies in areas with favorable structural development. The pegmatite exhibits clear zoning. From the core to the edge, there is a massive zone, a medium-to-coarse grained zone, and a fine-grained or graphic zone, and the massive and medium-to-coarse grained zones are the most pronounced. There are two mineralized pegmatite veins with industrial value in the mining area. Vein 101 is 227 m long and 3.25 m thick, and it has an average BeO content of 0.326%. Vein 102, which is 120 m long and 3.95 m thick, has an average BeO content of 0.233%.

Other Regions, Features and Areas containing this locality

References