The Yudu-Ganxian area in southern Jiangxi is an important tungsten polymetallic metallogenic area
The Yudu-Ganxian area in southern Jiangxi is an important tungsten polymetallic metallogenic area in Yudu-Ganxian County, which is located in the complex part of the east-west tectonic-metallogenic belt in Nanling and the north-east tectonic-metallogenic belt in Wuyishan. The structure of the area is developed, magmatic activity is strong, and metallogenic geological conditions are superior. The number and scale of tungsten polymetallic deposits are second only to Chong-Yu-Yu ore concentration area in southern Jiangxi, and the types of deposits are complete, including quartz vein type, Yunying rock type and skarn type. Granite veindle dyeing type, sedimentary rock veindle dyeing type, broken zone type and sand type. 1-Sinian-Devonian sandstone; 2-carbonitic carbonate rock; 3-Yanshan early granite; 4-geological boundary; 5-tungsten quartz vein; 6-fault; metallogenic characteristics of typical deposits in Yudu-Ganxian tungsten Polymetallic ore concentration area.
The ore-forming characteristics of a typical deposit in the tungsten-polymetallic ore area in the Gannan-Jiangxi province
Quartz vein type tungsten polymetallic deposit is the most widely distributed type in the ore concentration area, and is often developed in combination with the quartz quartz type, such as huangsha tungsten deposit, pangushan tungsten deposit and kenweiwo tungsten deposit.It is because of the discovery of new vein formation and quartzite mineralization in the deep part of huangsha tungsten deposit that it has been upgraded from small size in the 1950s to medium size in the 1960s to large size in the 1980s.The quartz vein type tungsten deposit is developed in the upper part of the deposit and is found in the inner and outer contact zone of the tiesandong granite body (age 168.1 Ma (Huang et al.,2011) in the early yanshan period. Most of the quartz vein type tungsten deposit is produced in the Cambrian metamorphic rocks, and some of the quartz vein type tungsten deposit is located in the hidden granite.Inner belt blind veins only occur in concealed granite, and the distribution of vein (belt) is closely related to the morphology of concealed granite body.The vein is divided into 8 groups from north to south: zhangmulin group, north group, middle group, qingshanwo group, bajiaokeng group, south group, north and south vein group and inner belt blind vein group.The W (Mo) ore body of the yun-ying type is developed in the rock bell section, a prominent part of huangsha concealed granite. The yun-ying mineralization is widely developed, and the mineralization thickness is quite large, reaching more than 20 meters.
The granite-type tungsten ore is represented by the scheelite, and is located in the carboniferous system with the calcium-containing layer in the southern contact zone of the early Yanshanian granitic body, which is close to the granite body (about 500 m), the bedding hydrothermal metasomatism is strong, and the calcium-iron pyroxene and the pomegranates are widely developed. Wollastonite and tremolite and other tectonite minerals and tungsten and sulfurized metal minerals belong to the contact metasomatic and metasometasomatic hydrothermal metasite-type deposit, and the beneficial components are derived from the hydrothermal process after the granitoid period, and then the deposit is formed by the metasomatic filling. The deposit of tungsten in the mining area is 27911.91 t and the average grade WO 3.308%.
